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Academic literature on the topic 'ANGLE OF BLADES'

Author: Grafiati
Published: 11 September 2023

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Journal articles on the topic "ANGLE OF BLADES"

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DEDA ALTAN, Burcin. "Enhancement of the performance of vertical axis wind rotors with straight blades." European Mechanical Science 7, no. 2 (June 20, 2023): 49–55. http://dx.doi.org/10.26701/ems.1246352.

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In this study, it has been aimed to improve the performance of vertical axis wind rotors with straight blades. For this purpose, an additional performance-enhancing setup has been used, placed in front of the vertical axis wind rotor with straight blades, in order to increase the performance. The effects on the rotor performance increase have been investigated numerically by keeping the dimensions of this performance-enhancing additional setup constant, by changing the number of blades of the straight bladed rotor and by changing the blade angles if the straight blades have been angled. Numerical analyzes performed in this study have been validated by experimental literature data. After creating the solid models required for the rotor performance analysis, the computational fluid dynamics (CFD) program ANSYS Fluent has been used. Here, studies have been carried out with two, three and four bladed rotors as the number of blades. As the blade angle, the effects of the angles between 180 and 120 have been examined. As a result of the study with the additional performance setup (APS), it has been determined that the optimum performance has been obtained with the vertical axis rotor with three blades and 150 blade angle. As a final result, it has been determined that the power coefficient obtained from the optimum vertical axis rotor with additional performance setup increased approximately 2.6 times compared to the optimum rotor without setup.
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Mwanyika, Hegespo H., Yusufu AC Jande, and Thomas Kivevele. "Design and Performance Analysis of Composite Airfoil Wind Turbine Blade." Tanzania Journal of Science 47, no. 5 (December 1, 2021): 1701–15. http://dx.doi.org/10.4314/tjs.v47i5.18.

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Abstract Small horizontal axis wind turbine rotors with composite airfoil rotor blades were designed and investigated in the present study in order to improve its performance in low wind speed and low Reynolds number (Re) conditions for standalone system. The geometrical and aerodynamic nature of a single airfoil small horizontal axis wind turbine blade curtails efficient energy harnessing of the rotor blade. The use of composite airfoil rotor blade improves energy production but imposes uncertainty in determining an optimal design angle of attack and the off design aerodynamic behaviour of the rotor. This research investigated the effects of two airfoils used at different sections in a composite blade and determined the blade’s optimal design angle of attack for maximum power generation. The wind turbine rotor blades were designed using blade element momentum (BEM) method and modelled by SolidWorks software. The SG6042 and SG6043 airfoils were used for the composite airfoil blades. Five wind turbines were designed with rotor blades of design angles of attack from 3° to 7°. The five wind turbine blades were simulated in computational fluid dynamics to determine the optimal design angle of attack. The composite airfoil wind turbine blade showed improved performance, whereas, the wind power generated ranged from 4966 W to 5258 W and rotor power coefficients ranged from 0.443 to 0.457. The blade with design angle of attack of 6° showed highest performance. Keywords: composite airfoil, lift-to-drag ratio, pressure coefficient, Reynolds number, design angle of attack.
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Li, Yan, Chang Zhao, Chunming Qu, Shouyang Zhao, Fang Feng, and Kotaro Tagawa. "Effect of Auxiliary Blade on Aerodynamic Characteristics of Vertical Axis Wind Turbine by Numerical Simulation." International Journal of Rotating Machinery 2019 (April 21, 2019): 1–17. http://dx.doi.org/10.1155/2019/8098160.

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In order to improve the aerodynamic characteristics of the Straight-bladed Vertical Axis Wind Turbine (SB-VAWT), a rotor structure with auxiliary blade installed behind the main blade was proposed in this study. To investigate the effects of relative thickness and the fixing angle of the auxiliary blade on aerodynamic characteristics of SB-VAWT, numerical simulations were carried out. Two shapes of NACA 4-digital series blade-section, NACA0018 and NACA0024, were selected as the main blades in this work. Effects of relative thickness and fixing angles of auxiliary blade on the aerodynamic performance of SB-VAWT had been analyzed in detail, which had 5 kinds of relative thickness and 3 kinds of fixing angles combined into 13 working conditions. And the main blades and the auxiliary blades were also decided as the NACA series airfoil with five kinds of relative thickness. Three kinds of fixing angle of auxiliary blade installed behind main blade were used including 0°, 5°, and 10°. The simulations included the output power coefficients, the static torque coefficients, and the flow fields around the main blade and auxiliary blade for both the dynamic and static conditions at some typical azimuth angles. The results show that the auxiliary blade with certain relative thickness and fixing angle can improve the output power characteristics and static torque characteristics of SB-VAWT, which can also provide research reference for improving the performance of VAWT.
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Nejadrajabali, J., A. Riasi, and S. A. Nourbakhsh. "Flow Pattern Analysis and Performance Improvement of Regenerative Flow Pump Using Blade Geometry Modification." International Journal of Rotating Machinery 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/8628467.

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Regenerative pump is a low specific speed and rotor-dynamic turbomachine capable of developing high heads at low flow rates. In this paper, a numerical study has been carried out in order to investigate the effect of blade angle on the performance of a regenerative pump. Two groups of impellers were employed. The first type has symmetric angle blades with identical inlet/outlet angles of ±10°, ±30°, and ±50° and the second group has nonsymmetric angle blades in which the inlet angle was set to 0° and six different angles of ±10°, ±30°, and ±50° were designed for the outlet of the blades. A total of 12 impellers, as well as primary radial blades impeller, were investigated in this study. The results showed that all forward blades have higher head coefficients than radial blades impeller at design flow coefficient. It was found that regenerative pumps with symmetric angle forward blades have better performance than other types. Also, it is worth mentioning that the highest head coefficient and efficiency occur at angle+10<β<+30of symmetric angle blades. It was found that the maximum efficiency occurs at angle of +15.5° by curve fitting to the data obtained from numerical simulations for symmetric angle forward blades.
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Saowalak Thongdee, Churat Tararuk, Natthawud Dussadee, Rameshprabu Ramaraj, and Tanate Chaichana. "Study on performance of a savonius wind turbines related with the blade angle." Maejo International Journal of Energy and Environmental Communication 1, no. 2 (August 9, 2019): 32–36. http://dx.doi.org/10.54279/mijeec.v1i2.244916.

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This research aimed to compare the performance of Savonius vertical axis wind turbines through blade numbers and different blade angles. In this study, applicable turbines having 4, 6, 8, 12, 16 and 18 numbers of blades with the angles of the blades of -15°, -5°, 0°, 5° and 15°, respectively. The rotor used was a semicircle shaped blade made from PVC material and has a blade diameter of 6 cm and 30 cm for both rotor diameter and height. The turbine was tested deadweight range of 0-0.49 kg at 4 m/s wind speed. The results showed that the blade angle has a positive effect on increasing the power and torque coefficient of Savonius wind turbine, specifically on blades less than 16. The highest power and torque coefficient was obtained from the turbine having16 blades at an angle of 5°. This configuration also found that the maximum power and torque coefficient in the tip speed ratio ranging from 0.3-0.4 are 0.2519 and 0.5858, respectively.
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Islamova, O. V., A. Z. Tokov, and F. A. Ataeva. "Energy efficiency is the most important indicator of the quality of food grinders." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 2 (November 1, 2019): 56–62. http://dx.doi.org/10.20914/2310-1202-2019-2-56-62.

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A brief analysis of the methods of grinding technological raw materials from the standpoint of energy efficiency has been performed. Studies show that cutting (grinding) the feedstock into pieces of a certain size is the most energy-intensive. Existing designs of cutting elements of grinding mechanisms (cutting blade, cutting edge) are not optimal from the standpoint of energy efficiency. For example, the cutting blade in the working hole has a taper angle of 90°, and the taper angle of the cutting blade on the blades of the movable knife is also in the range of 80–90°. It is proposed to make the sharpening angles of the cutting blades on the blades of a movable knife equal to 5–8°. In addition, the blades of such a knife should have the shape of a classic wedge in all cross sections. Reducing the angle of sharpening of the cutting blade in the working hole of the grill to such values does not succeed in terms of design features (in particular, without violating transparency indicators). The reserves of reducing the angle of sharpening of the cutting blade in the working hole are shown (this angle can be less than 90°). The performed studies indicate that the smaller the energy costs for grinding the feedstock, the less it is rubbed and squeezed out of the holes of the grate. It can be assumed that the organoleptic properties did not deteriorate after grinding (but remained). The lower the transparency of the lattice, the grinding process is more energy-consuming. The smaller the sharpening angles of the cutting blades of the knives, the more energy-efficient the grinding process. The worse the quality of the crushed raw materials, for example, meat, which is characterized by the excessive presence of connective and cartilage tissues, films, etc., the more energy-efficient is the grinding process with knives with cutting blades with minimal sharpening angles.
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Nugroho, Arif Setyo, Y. Yulianto Kristiawan, and Aris Teguh Rahayu. "Pengaruh Angle Attack Terhadap Luaran Generator Turbin Tipe Darrieus." AEEJ : Journal of Automotive Engineering and Vocational Education 4, no. 1 (April 10, 2023): 1–8. http://dx.doi.org/10.24036/aeej.v4i1.162.

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The angle and number of wind turbine blades. The turbine used for testing is a vertical Darrieus-H type turbine with variations in the number of blades 2, 3, and 4. Blades with NACA 4415 specifications, wind speeds with variations of 4 m/s, 5 m/s, 6 m/s, 7 m/s s, and 8 m/s. The source of the wind using a fan. Variations in the angle of attack are 0o, 10o, 20o, and 30o. The blade is made of sea sengon wood. At the position of the angle of attack, 10o rotates faster due to the influence of the lifting force of the blades. The position of the blade angle of attack 0o is difficult to rotate because the blade position is straight with the wind direction. The position of the angle of attack 20o and 30o blades is difficult to rotate because the lifting force of the blades is too heavy compared to the position of the angle of attack 10o. The highest electric power is obtained from the number of blades with 2 angles of attack 10o with a power of 10.5 watts. Penelitian ini bertujuan untuk mengetahui daya yang dihasilkan akibat pengaruh sudut dan jumlah blade turbin angin. Turbin yang digunakan pengujian adalah turbin vertikal tipe Darrieus -H dengan variasi jumlah sudu 2, 3, dan 4. Blade dengan spesifikasi NACA 4415, kecepatan angin dengan variasi 4 m/s, 5 m/s, 6 m/s , 7 m/s, dan 8 m/s. Sumber angin menggunakan kipas angin. Variasi sudut serang adalah 0o, 10o, 20o, dan 30o. Blade terbuat dari bahan kayu sengon laut. Pada posisi sudut serang 10o berputar lebih cepat karena pengaruh gaya angkat sudu. Posisi sudu sudut serang 0o sulit untuk diputar karena posisi sudu lurus dengan arah angin. Posisi sudut serang 20o dan 30o sudu sulit untuk diputar karena gaya angkat sudu terlalu berat dibandingkan dengan posisi sudut serang 10o. Daya listrik tertinggi diperoleh dari jumlah sudu dengan 2 sudut serang 10o dengan daya 10,5 watt.
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Santoso, Budi, Dominicus Danardono Dwi Prija Tjahjana, and Purwadi Joko Widodo. "Performance Evaluation of Axial Flow Wind Turbine Integrated with The Condenser." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 76, no. 3 (October 29, 2020): 85–91. http://dx.doi.org/10.37934/arfmts.76.3.8591.

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This study investigated the application of an axial flow wind turbine integrated with a condenser. The exhaust air from condenser was used to drive the wind turbine by a ducted turbine system. There were two parameters varied in this work: the blade number and the blade pitch angle. The blade number used was two blades, five blades, and ten blades, while the blade pitch angles were 5°, 10°, 15°, 20°, 30°, and 45°. The diameter of the wind turbine was 495 mm. The model of the condenser had a fan diameter of 600 mm and the range of the average air velocity of 2.01 m/s - 7.86 m/s. The maximum mechanical power was 10.72 W for air velocity of 7.86 m/s. The maximum power coefficient recorded was 0.38 for the tip speed ratio of 1.3 on the blade number of five blades and a pitch angle of 10°. The maximum exhaust air energy recovery was 13.64% of the power consumption of the condenser fan.
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Tleubergenova, A. Zh, N. K. Tanasheva, K. M. Shaimerdenova, N. K. Botpaev, S. B. Kassiyev, and L. L. Minkov. "Investigation of Aerodynamic Characteristics of a Two-Bladed Sailing Wind Turbine." Bulletin of the Karaganda University. "Physics" Series 109, no. 2 (March 30, 2023): 42–48. http://dx.doi.org/10.31489/2023ph1/42-48.

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The article examines a prototype of a wind turbine with two blades. For experimental work, a mock-up of a sailing wind turbine consisting of two blades was developed. The material of the sail blades was selected according to elasticity and lightness, cheapness, roughness of the streamlined surfaces. The study shows the aerodynamic parameters acting on the blade. The air flow velocity varied from 3 to 12 m/s. The dependence of the lifting force and the frontal barrier on the air flow velocity was obtained by turning the blades of the wind turbine so that the angle of attack was α = 00, 150, 300, 450, 600. It is established that when the position of the blade’s changes, the lifting force and the drag force decrease. With an increase in the angle of attack α > 00 leads to a decrease in the midsection of the wind wheel with respect to the air flow. On this basis, there is a decrease in aerodynamic forces. As the speed of the air treacle increases, the speed of rotation of the wind wheel also increases. However, during the experiment it was found that the location of the blades at different angles affects the numerical value of the rotational speed. According to the conducted experiments, several values were obtained. The analysis of the obtained values is carried out. A graph is constructed based on the dependence of the wind wheel rotation frequency on the wind speed with a change in the angle of attack. A wind turbine with blades with a variable angle of attack, which, turning, gradually become more parallel to the direction of the wind. Centrifugal forces regulate the inclination of the blades, and as a result, the speed of rotation of the wind wheel, and keep the wind generator at the nominal speed of rotation.
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Sasongko, Herman, Heru Mirmanto, Galih Bangga, Elita Fidiya Nugrahani, and Johan Nicholas Pasaribu. "NUMERICAL APPROACH OF THE BLADE SHAPE AND NUMBER ON THE PERFORMANCE OF MULTIPLE BLADE CLOSED TYPE IMPULSE WIND TURBINE." International Journal of Mechanical Engineering Technologies and Applications 4, no. 2 (June 30, 2023): 220–35. http://dx.doi.org/10.21776/mechta.2023.004.02.11.

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An impulse turbine uses drag force on its blades to produce torque on its rotor. As fluid flows over the blades, pressure changes occur at the nozzle, which increases the fluid's velocity and reduces the static pressure at the nozzle outlet. The high-momentum fluid then impinges on the rotor blades, generating frictional force and resulting in torque production. To study the impact of blade shape and number on the turbine's performance, simulations were conducted. The results indicate that blades with an angle of 0° and 180° are optimal for creating high-pressure vortices on the concave surface of the blade. Addition-ally, more blades always result in higher torque and power out-put by increasing the active area of the blades. However, in the case of blades with an angle of 0° and 180°, 8 blades produced more torque than 12 blades with an angle of 0° and 90°. There-fore, blades with an angle of 0° and 180° are highly effective at generating drag force and producing torque.
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Dissertations / Theses on the topic "ANGLE OF BLADES"

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Riyad, Iftekhar A. "An Analysis of Harmonic Airloads Acting on Helicopter Rotor Blades." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2507.

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Rotary wing aircrafts in any flight conditions suffer from excessive vibration which makes the passengers feel uncomfortable and causes fatigue failure in the structure. The main sources of vibration are the rotor harmonic airloads which originate primarily from the rapid variation of flow around the blade due to the vortex wake. In this thesis, a mathematical model is developed for rotor blades to compute the harmonic airloads at rotor blades for two flight conditions vertical takeoff and landing, and forward flight. The sectional lift, drag, and pitching moment are computed at a radial blade station for both flight conditions. The lift at a particular radial station is computed considering trailing and shed vortices and summing over each blade. The results for airloads are obtained after considering zeroth, first, and second harmonics. The calculated results for airloads are compared to the experimental flight-test data.
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Lewis, Daniel Russell. "Tip clearance and angle of attack effects upon the unsteady response of a vibrating flat plate in crossflow." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/43198.

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The influence of tip clearance and angle of attack upon the mid-span unsteady pressure response of a vibrating flat plate was investigated experimentally. Unsteady pressure measurements were taken for a variety of incidence angles, vibration frequencies and tip clearances over a Mach number range of 0.2 to 0.6.

It was found that changes in tip clearance had an effect on measured pressure fluctuations at higher angles of attack and larger Mach numbers. It was also observed that the amplitude of the unsteady pressure increased as the incidence angle was increased.

The plate was mechanically induced to oscillate in translation, simulating the flISt bending mode. Averaged Fast Fourier Transforms were used to determine pressure oscillation amplitudes and phase lags with respect to the plate motion.


Master of Science
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Weiss, Samuel Bruce. "Vertical axis wind turbine with continuous blade angle adjustment." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/65178.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 26).
The author presents a concept for a vertical axis wind turbine that utilizes each blade's entire rotational cycle for power generation. Each blade has its own vertical axis of rotation and is constrained to rotate at the rate of one half of a revolution per full revolution of the rotor. For a rotor of radius r and blades of width b, a technical analysis predicts a theoretical maximum power coefficient of CP = b 2r+b, neglecting wind flow interference by upwind blades. This theoretical power coefficient is generally greater than the efficiency of a typical Savonius wind turbine (CP ~~ 0.15), and it reaches CP = 0.5 at the limiting blade width, b = 2r. The analysis also predicts a static torque and optimal tip-speed ratio that are both greater than those of a Savonius wind turbine with similar blade dimensions. Design considerations for implementing the kinematic constraint and for blade adjustment to account for changes in wind direction are discussed, and the author's prototype is presented. Testing of the prototype demonstrated that implementation of the kinematic constraint is feasible, and that efficiencies greater than those achievable by a Savonius turbine are plausible. In 4 m s wind conditions, the prototype yielded an estimated CP of 0.15, with much room for improvement through design changes and blade optimization in future iterations of this style of turbine.
by Samuel Bruce Weiss.
S.B.
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Harson, Andrew. "A blade angle control system for large variable pitch fans." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334529.

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Carrasco, Mora Enrique. "Variable Stator Nozzle Angle Control in a Turbocharger Inlet." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174345.

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Turbochargers are becoming an essential device in internal combustion engines as they boost the intake air with more pressure in order to increase the power output. These devices are normally designed for a single steady design point but the pulsating flow delivered from the internal combustion engine is everything but steady. The efficiency drop experienced in the off-design points by the fixed geometry turbochargers have made some research groups to look into new variable geometry solutions for turbocharging. A nozzle ring is a device which normally achieves a higher performance under design conditions, but the efficiency rapidly drops at off-design conditions. In this paper, a variable angle nozzle ring is designed and implemented in the model of a radial turbine of a turbocharger in order to study its potential when working under real internal combustion engine cycles. To understand the profit margin the turbine performance is compared with two turbines with the same impeller geometry: one without nozzle ring and one with a nozzle ring with a fixed angle. The results show that the maximum efficiency angle function calculated for the variable angle nozzle ring achieves an improvement in the total efficiency of 5 % when comparing with a turbine with a fixed angle and 18 % when comparing with a vaneless turbine. The improved guidance achieved due to the variable blade angle leads to less turbine losses and therefore more mechanical energy can be extracted from the exhaust mass flow throughout all the combustion cycle but a further study should be made in order to match all the engine operations points. Notably, taking the pulsating boundary conditions into consideration, a remarkable improvement is achieved already for the fixed angle nozzle ring.
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Austin, Jeffrey G. "Mach number, flow angle, and loss measurements downstream of a transonic fan-blade cascade." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA280907.

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Karlsson, Peter, Wai Cheung (Gary) Au, Simon Ernstedt, Anders Lundin, and Johan Linders. "Angel Thesis : En spel produktion." Thesis, Blekinge Tekniska Högskola, Sektionen för teknokultur, humaniora och samhällsbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4422.

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Detta projekt har varit ett som har haft både sina höga och låga punkter. Vi påbörjade detta projektet med viljan att skapa ett spel som var vårt, som representerade oss och som vi vill spela. Vad vi slutligen bestämde oss att göra var ett spel som fokuserade på story och spel-känsla som hade en mystisk stämning och sin egen stil. Detta tillsammans med ett par bra koncept och idéer så påbörjade vi att arbeta på Angel Thesis, ett action RPG. Vi har under projektets gång stött på många svårigheter, något som om och igen testat gruppens moral. Vår största svårighet har varit vårt byte utav utvecklingsplattform och spel-motor, som har skett två gånger under projekts gång. Detta har resulterat till stora diskus-sioner i gruppen som har slagit hårt mot vår moral men det har aldrig lyckats krossa vår förtroende med att fortsätta projekten. Vår grupp har hamnat i svåra depressioner men i slutändan så lyckades vi stå upp och fortsätta vidare som en grupp. Spelet började i 3D, sedan till 2D byggd från grunden i XNA och slutligen räddad av använd-ningen av Wintermute. Vårt spel Angel Thesis blev kanske inte i slutet exakt så som vi ur-sprungligen planerade, mycket av de action-betonade spelmomenten försvann och en del mer avancerade funktioner som pussel-systemet, inventory och cut-scenes fick gå. Anledningarna till detta är både av tidsskäl, och att Wintermute är inte gjord för hantera de här funktionerna. Det finns också en del andra ursprungliga funktioner som finns där men funkar inte så perfekt som vi vill, igen pga tid och Wintermute-motorns begränsningar. Spelet har också förändrats från 3D till 2D vilket har påverkat hur spelet spelas och upplevs. Trots detta så känner vi att våra ursprungliga idéer, visioner och mest viktigt att den känslan som vi ville ge, finns där. Vi har övervunnit stora svårigheter som vi i framtiden förmodligen kommer att påträffa igen, det är igenom detta som vi har fått en värdefull upplevelse som vi kan ta med oss till vårt framtida arbetsliv.
Detta är en reflektionsdel till en digital medieproduktion.
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Russ, Thomas William. "A surface flow visualization study of boundary layer behavior on the blades of a solid-wall compressor cascade at high angles of attack." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53161.

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The oil-film surface flow visualization technique was applied to circular arc compressor blades in a solid wall, high aspect ratio cascade for the purpose of describing the transition from corner stall to full blade stall, and the blade surface flow under fully stalled conditions. Photos of the visualizations for three stagger angles are presented and analyzed. A map quantitatively describing the observed boundary layer development at midspan is presented. The most interesting discovery of the work showed the suction surface flow to be essentially two-dimensional, in the geometric sense, preceding and following the transition to a fully separated flow at the leading edge. Corner stall was the observed three-dimensional mechanism prior to full stall. For fully-stalled conditions, the three-dimensional mechanism took the form of recirculating flow regions at the blade ends. Complete separation at the leading edge occurred at lower angles of attack for the higher stagger angles. Special blade oil-flow tests were conducted to evaluate Reynolds number and tip clearance effects on boundary layer development. The experimental work was done as part of a larger research program aimed at measuring and predicting the stalled performance of a compressor cascade.
Master of Science
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Burgess, Claire Reilly <1990&gt. "The Book of Copper and the Anvil of Death: Gothic Elements of William Blake’s Creation Myth." Master's Degree Thesis, Università Ca' Foscari Venezia, 2019. http://hdl.handle.net/10579/15194.

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This Joint Degree thesis will pull largely from William Blake’s major poems and visual art between America, A Prophecy (1793) and Jerusalem (1820) in order to contribute to a dimension of the discussion of Blake’s later “prophecies” that has not received much attention in Blake scholarship until fairly recently. This dimension is the Gothic elements of Blake’s oeuvre, which extend well beyond the artist’s predilection for graveyard imagery. With recent scholarship by David Punter as its base, the thesis will demonstrate that the substance of William Blake’s creation myth (concerning two demiurges, Urizen and Los, and their part in the simultaneous creation and fall of both mankind and the material world) lies upon Gothic bones. The narrative web Blake spins, like those of Faust and Shelley, among others, relies upon a hubristic seeker of arcane and profane knowledge creating something monstrous. The thesis will be broken into three parts. Part one will center around the nature of the arcane knowledge itself. This section will first demonstrate that Blake believed himself to be the possessor of divinely-bestowed, powerful knowledge before showing — largely through visual analysis of Blake’s illustrations — that he gave this same knowledge to his two major players in the creation myth: Urizen and Los. The second section will develop this line of thinking with several bits of in-depth analysis of the characters themselves and their actions in the poetry, showing that the source of this knowledge within the narrative is, in true Gothic fashion, the grave. The third and final section will turn to the abominable result of Urizen and Los’s machinations: fallen man, who is monstrous in his very nature.
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Sundberg, Johanna, Martina Lundberg, Julia Solhed, and Aikaterini Manousidou. "Two-dimensional Study of Blade Profiles for a Savonius Wind Turbine." Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-412795.

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A Savonius wind turbine is a self-starting vertical axis rotor. It can be designed to be compact in size and also produces less noise which makes it suitable to integrate into urban spaces such as rooftops and sign-poles. These characteristics make it interesting from a sustainability point of view, especially when aiming to increase the decentralization of electricity production. This thesis aimed to investigate the aerodynamic performance of different two-bladed Savonius profiles by varying the blade arc angle and the overlap ratio. For evaluation, the dimensionless power coefficient and torque coefficient were investigated over different tip speed ratios. The study was conducted numerically with 2D simulations in Ansys Fluent. The partial differential equations describing the characteristics of the flow, including the flow turbulence effects, were solved with the Reynolds-average Navier Stokes in combination with the k-omega SST model. A validation was performed by comparing data from simulated and experimental tests of a semi-circular profile and a Benesh profile. The investigation of the blade arc angle and overlap ratio was performed on a Modified Bach profile. The profile with a blade arc angle of 130 degrees and an overlap ratio of 0.56 generated a maximal power coefficient of 0.267 at a tip speed ratio of 0.9. This blade configuration generated the best performance of all conducted simulations in this project. However, this project contained uncertainties since simulations can never be an exact description of reality. The project was also limited by the computational power available. Nevertheless, according to the conducted simulations, it was observed that a higher blade arc angle and a larger overlap ratio seem to generate higher efficiency.
En Savonius vindturbin är en självstartande vertikalaxlad rotor som kan utformas i en kompakt design samtidigt som den producerar mindre oljud än horisontalaxlade vindkraftverk. Dagens hållbarhetssträvan i kombination med Savonius turbinens karakteristiska egenskaper gör den till ett potentiellt starkt vertyg för vindenergi. Då den kan placeras på exempelvis hustak eller skyltstolpar, utan att störa närliggande omgivning, finns det många möjliga sätt att implementera och integrera den i samhällets infrastruktur. Målet med detta projekt var att undersöka den aerodynamiska prestationen för Savoniusturbiner med två blad genom att variera bladvinkeln och överlappningsförhållandet. För att jämföra de olika profilerna användes den dimensionslösa effektkoefficienten och momentkoefficienten. Dessa koefficienter beräknades i förhållande till löptalet. Studien utfördes numeriskt med 2D-simuleringar i Ansys Fluent. De partiella differentialekvationerna som beskriver flödets egenskaper, inkluderat turbulenseffekterna, löstes med Reynolds-average Navier Stokes i kombination med k-ω SST modellen. En validering utfördes genom att jämföra data med simulerade och experimentella värden av en Semi-circular profil och en Benesh profil. Studien av bladvinkel och överlappningsförhållandet utgick från en Modified Bach profil. Den mest effektiva profilen hade en bladvinkel av 130 grader och ett överlappsförhållande på 0,56. Den genererade en maximal effektkoefficient av 0,267 vid löptal 0,9. Projektet innehöll en del osäkerheter då simuleringar aldrig kan beskriva verkligheten till fullo. Den tillgängliga beräkningskapaciteten begränsade även projektet ytterligare. Trots vissa begränsningar, visar ändå utförda simuleringar att ökad bladvinkel och ökat överlappningsförhållande genererar högre effekt.

This project was conducted within Stand up for wind and Stand up for energy.

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Books on the topic "ANGLE OF BLADES"

1

F, Groeneweg J., and Lewis Research Center, eds. Prediction of unsteady blade surface pressures on an advanced propeller at an angle of attack. Cleveland, Ohio: Lewis Research Center, 1989.

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The angel tapes: A Blade Macken mystery. New York: St. Martin's Press, 1997.

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C, Zierke William, and United States. National Aeronautics and Space Administration, eds. The measurement of boundary layers on a compressor blade in cascade at high positive incidence angle. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Nasson, Bill. Uyadela wen'osulapho: Black participation in the Anglo-Boer war. Randburg [South Africa]: Ravan Press, 1999.

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Family love in the diaspora: Migration and the Anglo-Caribbean experience. New Brunswick, NJ: Transaction Publishers, 2006.

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Hare, Nathan. The Black Anglo-Saxons. 2nd ed. Chicago: Third World Press, 1991.

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BeLeTe. Exposed: The White Anglo-Saxon European and American conspiracy. Las Vegas, NV. (1905 So. Eastern Ave., Las Vegas 89104): CTV Advertising Concepts, 1993.

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Chamberlain, Mary. Family love in the diaspora: Migration and the Anglo-Caribbean experience. New Brunswick, U.S.A: Transaction Publishers, 2006.

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The Blue Angel: Der Blaue Engel. London: BFI Publishing, 2002.

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Working the diaspora: The impact of African labor on the Anglo-American world, 1650-1850. New York: New York University Press, 2009.

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Book chapters on the topic "ANGLE OF BLADES"

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Shen, Wen Zhong, Martin O. L. Hansen, and Jens Nørkær Sørensen. "Determination of Angle of Attack (AOA) for Rotating Blades." In Wind Energy, 205–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-33866-6_37.

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Bulatov, Yura, Andrey Kryukov, Van Huan Nguyen, and Duy Hung Tran. "Fuzzy Controller of Rotation Angle of Blades of Horizontal-Axial Wind Power Generation Plant." In Advances in Intelligent Systems and Computing, 892–901. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19868-8_88.

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Chiu, Yi-Jui, Ya-Zheng Zhao, Xiao-Yun Li, Chia-Hao Yang, Guo-Fei Yu, and Cheng-Wei Ye. "Nonlinear and Linear Phenomenon Investigation of Coupled Vibration of a Multi-disc Rotor Based on Multi-mistuned Blades Length or Multi-disordered Staggle Angle Blades." In Nonlinear Systems and Complexity, 79–106. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94301-1_4.

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Li, Shao-hua, Zhi-jun Li, and Ting-ting Guo. "Numerical Simulation Study on the Effect of Rotation on Film Cooling of Blades with Compound Angle Holes." In Advances in Intelligent and Soft Computing, 429–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25194-8_52.

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Sirojuddin, Lukman K. Wardhana, Obit Rizky, Regina Ibnawati, and Junior R. Syahri. "Investigation of the Angle Variations of the Guide Vane’s Bottom Guide Plate Againsts the Inflow of Banki Turbine Blades." In Proceedings of the 6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, 493–504. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4481-1_47.

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Ling, Zhang, Wen Guo-liang, and Peng Tao. "Numerical Investigation on Two Compound Angles Film Cooling of Stator Blades." In Advances in Intelligent and Soft Computing, 689–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25194-8_81.

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Ma, Hui, Tong Yang, Shiyu Liu, Qi Sun, and Bangchun Wen. "Effects of Twist Angle on Rubbing Induced Vibration Responses of Blade." In Mechanisms and Machine Science, 193–204. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_14.

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Serrano-Barreto, Carlos L., Jesús Enrique Sierra-García, and Matilde Santos. "Intelligent Hybrid Controllers for the Blade Angle of Floating Wind Turbines." In 16th International Conference on Soft Computing Models in Industrial and Environmental Applications (SOCO 2021), 461–70. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87869-6_44.

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Rozhkov, K. E., I. A. Krivosheev, and N. B. Simonov. "Selection of Incidence Angle at Designing Blade Row of Compressors and Turbines." In Proceedings of the 4th International Conference on Industrial Engineering, 197–204. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95630-5_21.

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Das, Nabanikha, Amir Sohail, Rajesh Doley, and Shikha Bhuyan. "Computational Fluid Dynamics Analysis of Wind Turbine Blades at Various Angles of Attack." In Advances in Smart Energy Systems, 175–84. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2412-5_10.

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Conference papers on the topic "ANGLE OF BLADES"

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Kazemifar, Farzan, Mehdi Molai, Bahar Firoozabadi, and Goodarz Ahmadi. "A Numerical Study of Geometrical Effects on the Strouhal Number of a Circular Cylinder." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69034.

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In this paper, reducing the Strouhal number of a circular cylinder is studied numerically. Two-dimensional numerical simulations of flow over a normal circular cylinder and various modified circular cylinders are carried out using FLUENT® soft ware. Two small blades are attached to a circular cylinder and the effects of variation of the blades length and the blade angle are studied numerically. The blade angle is chosen 2α = 0°, 30°, 90°, 120° and 150°. The blades length is chosen l/d = 0.125, 0.25, 0.375. Effects of blade angles and blade lengths were studied for both 2α = 0° and 150°. Results show that increasing in blade lengths decreases the Strouhal number. Moreover, as the blade angle was increased from zero to 90°, the percentage reduction in Strouhal number decreased; however, as the blade angle was further increased from 90° to 150°, the percentage reduction in Strouhal number increased. Although the modifications studied here decrease the vortex shedding frequency they make the vortices shed from the cylinder farther and stronger hence increasing the magnitude of the fluctuating forces.
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Atique, Md Saifuddin Ahmed, Xueling Song, and Cai Xia Yang. "Pitch Angle & Decalage Effect in Biplane Blade Design for Wind Turbines." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-68989.

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Abstract To reduce the environmental pollution and introduce new form of energy source, the popularity of harvesting energy from wind is increasing day by day. Wind turbines blades are growing longer, as increasing blade length is one of the best ways to produce more wind energy per turbine. However, longer blades require thicker root at the inboard section to counteract the bending load and this thicker root at the inboard section of the large wind turbine blades lower the blades aerodynamic efficiency. This loss of aerodynamic efficiency prevents these longer wind turbine blades from being fully effective as the cost to benefit ratio increases and less power is generated than the optimal value. Additionally, these long blades use a large amount of material. Longer blades require more support to remain structurally sound, which causes a large increase in mass. This material is hard to break down and decompose, causing them to take up a large amount of space in landfills when the blades are unserviceable or replaced because of damage and stress. To overcome this drawback and maximize the harvested energy from the wind, a novel “Biplane” shape wind turbine blade is proposed by the researchers which replaced the monoplane inboard section of the traditional wind turbine blades with the biplane inboard section. This new concept allows to design and manufacture longer wind turbine blade without any loose in aerodynamic efficiency and structural integrity. Biplane wind turbine blades have shown very interesting and promising characteristics in terms of both aerodynamics and structural performance. This new type of wind turbine blade can ensure more power, better aerodynamics efficiency, structural integrity along with lower manufacturing and transportation cost. Previous research conducted found the significant effect of gap and stagger in the aerodynamic performance of biplane blades. However, another very important parameter “pitch angle & decalage” that can improve the aerodynamic performance of biplane wind turbine blades remains unchecked. Keeping that in mind, the current research performed a detailed computational fluid dynamic (CFD) based analysis to find out the pitch angle & decalage effect in biplane wind turbine blade design. Our current research revealed that, apart from the contribution of gap and stagger, the effect of pitch angle & decalage can be significant. At a 6° angle of attack, with both top and bottom blade aerofoil pitch angle setup at positive (+ve) 3° which means decalage is 0°, can improve the lift coefficient (Cl) and the lift to drag ratio (Cl/Cd) or aerodynamics efficiency raised around 48% higher while gap to chord ratio (g/c) and stagger to chord ratio (s/c) were kept 0.5 and 0.25 respectively obtained from the previous state of art.
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Hidayat, Achmat, and Andi Idhil Ismail. "Simulation of Wind Turbines with Variation of Number of Blades and Blades Angle on Turbine Performance." In International Conference on Industrial Technology. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0009423101150118.

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Izadi, Mohammad J., and Alireza Falahat. "Effect of Blade Angle of Attack and Hub to Tip Ratio on Mass Flow Rate in an Axial Fan at a Fixed Rotational Speed." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55179.

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In this investigation an attempt is made to find the best hub to tip ratio, the maximum number of blades, and the best angle of attack of an axial fan with flat blades at a fixed rotational speed for a maximum mass flow rate in a steady and turbulent conditions. In this study the blade angles are varied from 30 to 70 degrees, the hub to tip ratio is varied from 0.2 to 0.4 and the number of blades are varied from 2 to 6 at a fixed hub rotational speed. The results show that, the maximum flow rate is achieved at a blade angle of attack of about 45 degrees for when the number of blades is set equal to 4 at most rotational velocities. The numerical results show that as the hub to tip ratio is decreased, the mass flow rate is increased. For a hub to tip ratio of 0.2, and an angle of attack around 45 degrees with 4 blades, a maximum mass flow rate is achieved.
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Jiang, Mai, Wei Liang, and Xiaoling Zhang. "Helicopter blades pyramid angle measurement based on panoramic vision technology." In 2012 International Conference on Information and Automation (ICIA). IEEE, 2012. http://dx.doi.org/10.1109/icinfa.2012.6246852.

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Zafar, Sayem, and Mohamed Gadalla. "Design and Evaluation of a Rooftop Wind Turbine Rotor With Untwisted Blades." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98217.

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A small horizontal axis wind turbine rotor was designed and tested with aerodynamically efficient, economical and easy to manufacture blades. Basic blade aerodynamic analysis was conducted using commercially available software. The blade span was constrained such that the complete wind turbine can be rooftop mountable with the envisioned wind turbine height of around 8 m. The blade was designed without any taper or twist to comply with the low cost and ease of manufacturing requirements. The aerodynamic analysis suggested laminar flow airfoils to be the most efficient airfoils for such use. Using NACA 63-418 airfoil, a rectangular blade geometry was selected with chord length of 0.27[m] and span of 1.52[m]. Glass reinforced plastic was used as the blade material for low cost and favorable strength to weight ratio with a skin thickness of 1[mm]. Because of the resultant velocity changes with respect to the blade span, while the blade is rotating, an optimal installed angle of attack was to be determined. The installed angle of attack was required to produce the highest possible rotation under usual wind speeds while start at relatively low speed. Tests were conducted at multiple wind speeds with blades mounted on free rotating shaft. The turbine was tested for three different installed angles and rotational speeds were recorded. The result showed increase in rotational speed with the increase in blade angle away from the free-stream velocity direction while the start-up speeds were found to be within close range of each other. At the optimal angle was found to be 22° from the plane of rotation. The results seem very promising for a low cost small wind turbine with no twist and taper in the blade. The tests established that non-twisted wind turbine blades, when used for rooftop small wind turbines, can generate useable electrical power for domestic consumption. It also established that, for small wind turbines, non-twisted, non-tapered blades provide an economical yet productive alternative to the existing complex wind turbine blades.
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Körbächer, Heiko, and Albin Bölcs. "Steady-State and Time-Dependent Experimental Results of a NACA-3506 Cascade in an Annular Channel." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-334.

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An experimental investigation of the steady-state and time-dependent aerodynamic behaviour of a compressor cascade in a ring channel was conducted at the Laboratoire de thermique appliquée et de turbomachines (LTT) at the Swiss Federal Institute of Technology in Lausanne. The cascade consisted of 20 blades with a NACA-3506 profile, stagger angle of 40°, and solidity of 0.72 at midspan. Measurements were done for a number of incidence angles over a small range of inlet Mach numbers between ∼0.75 and ∼0.8 in order to examine the influence of an increasing angle of attack on the steady-state and time-dependent pressures. As the angle of attack increased a growing corner stall was observed at the hub and a supersonic zone appeared at the leading edge. The cascade was vibrated in bending mode with a constant amplitude at a reduced frequency of ∼0.42 at imposed interblade phase angles ranging from 0° to 324°, but also with each blade vibrating in a single blade vibration mode. The unsteady data showed that the cascade was in general damped with the minimum damping between ∼−36° to ∼+36° interblade phase angle for all examined incidence angles. The influence coefficient technique was used to identify the damping influence of each of the blades on itself (eigeninfluence) and of blades up and down the cascade (positive- and negative-sided) for different inlet incidence angles.
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Hojo, Masahiro, Ryosaku Hashimoto, Akinori Ogawa, Yasushi Sofue, and Yukio Matsuda. "Mechanical Behavior of Anti-Symmetrically Laminated Composite Blades." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68667.

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Anti-symmetrically laminated composites have coupling effects between tensile stress and twisting deformation, and are very attractive as fan blade materials of aircraft engines. Blades fabricated by anti-symmetrically laminated composites can automatically adjust the stagger angle to better aerodynamic conditions with change of axial force or rotational speed owing to the coupling effects. Thus, the anti-symmetrically laminated composite blades are expected to improve aerodynamic efficiency and the stability of aircraft engines. In this paper, the mechanical behavior of anti-symmetrically laminated composite blades is evaluated by spin tests and finite element analyses. Three kinds of blades fabricated by carbon/epoxy laminated composites in different anti-symmetrical stacking sequences were tested. A non-contact measurement technique using a multi-channel optical fiber sensor was used for measurements of blade deformations at high-speed rotating conditions, up to 10,000 rpm. The twisted angle change at the blade tip could be successfully measured. The twisted angle change increased in proportion to the second power of rotational speed, and the maximum angle change was about 4 degree at 10,000 rpm. The finite element analysis results agreed well with the spin test results. Furthermore, the three-dimensional deformation of the test blades was evaluated based on finite element analyses.
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Pesek, Ludek, Pavel Snabl, and Chandra Shekar Prasad. "Modal Synthesis Method for Inter-Blade Dry-Friction Surface Angle Design of Turbine Wheel for Vibration Suppression." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-88382.

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Abstract New calculation approach based on modal synthesis method is proposed for evaluation of structural and dry-friction damping effect on self-excited vibrations due to aero-elastic instability in the bladed turbine wheels. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blade cascade. The self-excited aero-elastic forces of blades are described by Van der Pol model. The proposed method as reduced order method (ROM) simplified approach is computationally efficient solution allowing to estimate effect of many important blade cascade parameters of such a complex non-linear mechanical system. The paper is aimed at the narrow frequency range of nozzle excitation and on the case when a slip motion is prevailing in the contacts. The method is applied herein to an industrial turbine wheel design with 66 blades. For evaluation of damping effect, the tie-boss and shroud couplings are applied. Therefore, neighboring blades are interconnected by rigid arms that are on one side fixed to one blade and are in friction contact on their free side with the other blade. Static normal contact forces are prescribed in contact point pairs at the initial state. Due to relative normal motions in contacts, the prescribed contact forces vary in time. Friction forces in contacts are driven by the modified Coulomb friction law. The effect of the angles of inter-blade contact surfaces on the wheel dynamics and on level of friction damping is discussed.
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Raciti Castelli, Marco, and Ernesto Benini. "Effect of Blade Inclination Angle on a Darrieus Wind Turbine." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23332.

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This paper presents a model for the evaluation of energy performance and aerodynamic forces acting on a small helical Darrieus vertical axis wind turbine depending on blade inclination angle. It consists of an analytical code coupled to a solid modeling software, capable of generating the desired blade geometry depending on the desired design geometric parameters, which is linked to a finite volume CFD code for the calculation of rotor performance. After describing and validating the model with experimental data, the results of numerical simulations are proposed on the bases of five machine architectures, which are characterized by an inclination of the blades with respect to the horizontal plane in order to generate a phase shift angle between lower and upper blade sections of 0°, 30°, 60°, 90° and 120° for a rotor having an aspect ratio of 1.5. The effects of blade inclination on tangential and axial forces are first discussed and then the overall rotor torque is considered as a function of azimuthal position of the blades. Finally, the downstream tip recirculation zone due to the finite blade extension is analyzed for each blade inclination angle, achieving a numerical quantification of the influence of induced drag on rotor performance, as a function of both blade element longitudinal and azimuthal positions of the blade itself.
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