Rozprawy doktorskie na temat „Axial flow impeller blades”
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Wong, Vui-Hong, i n/a. "Finite Element Analysis and Improvement of Impeller Blade Geometry". Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030825.150853.
Pełny tekst źródłaWong, Vui-Hong. "Finite Element Analysis and Improvement of Impeller Blade Geomtery". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/367302.
Pełny tekst źródłaThesis (Masters)
Master of Philosophy (MPhil)
School of Engineering
Full Text
Li, Yiguang. "Three-Dimensional Flow and Performance Simulation of Multistage Axial Flow Compressors". Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/4591.
Pełny tekst źródłaKarikh, A. "Interaction of impeller and guide vane in a series-designed axial-flow pump". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/34873.
Pełny tekst źródłaChamphekar, Omkar G. "Inverse Design of Two-Dimensional Centrifugal Pump Impeller Blades using Inviscid Analysis and OpenFOAM". University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342544389.
Pełny tekst źródłaKazi, Sheila K. "Numerical study of simulated low Reynolds number axial turbine blades with flow transition". Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490816.
Pełny tekst źródłaCobian, Marcela Ivonne. "Investigation on the flow dynamics of mesoscale inlet guide vanes". To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Pełny tekst źródłaVenter, Sarel Jacobus, i D. G. Kroger. "The effectiveness of axial flow fans in a-frame plenums". Thesis, Stellenbosch : University of Stellenbosch, 1990. http://hdl.handle.net/10019.1/15625.
Pełny tekst źródła260 leaves printed single pages, preliminary pages i-xxi and numbered pages Chapter 1/1.1-1.3, Chapter 2/2.1-2.17, Chapter 3/3.1.1-3.10, Chapter 4/4.1-4.18, Chapter 5/5.1-5.3, References pages R.1-R.7, Appendix A pages A.1-A.34, Appendix B pages B.1-B.34, Appendix C pages C.1-C.26, Appendix D pages D.1-D.16, Appendix E pages E.1-E.30, Appendix F pages F.1-F.39. Includes bibliography, list of tables, figures and symbols.
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ENGLISH ABSTRACT: The ultimate goal of this project is to ensure a better understanding of the governing mechanisms present when flow distorting components are installed in close proximity of an axial flow fan. The effect of different parameters on the operation of axial flow fans is investigated. These parameters are divided into flow enhancing and flow reduction effects. The performance of an axial flow fan can be enhanced by changing the tip clearance, by adding a solid disc to the hub of the fan or by varying the number of fan blades. Flow reductions are caused by components such as inlet grids, walkways and their supporting structures, heat exchangers and windwalls. The effects of flow enhancing components are measured and compared to the results of other authors. The sensitivity of these effects to parameters such as the type of fan rotor and the specific system in which the rotor is installed is highlighted. The system effect (the interaction between the fan rotor and flow resistances in close proximity of each other) of individual components, as well as the combination of different components, is predicted both theoretically and experimentally. These predictions are compared to measured data relevant to the components in an installation where the system effects are present. The results are correlated to the kinetic energy flux coefficient of the flow at different locations within the installation. Experimental data obtained from a full scale unit (inlet shroud diameter of 9,216 m) are used to compare to scaled data from the model (inlet shroud diameter of 1,542 m). The hub to tip ratio of the axial flow fans investigated is 0,15. The most important conclusions are that the performance of the type of axial flow fan under investigation can be improved by reducing its tip clearance and by installing a solid disc to the downstream side of the rotor. An increase in the number of blades of the fan leads to only marginal improvements in the fan performance. The overall performance of the system can also be improved by removing some of the flow resisting components, or by changing their relative positions. All these conclusions are based on the assumption that the power input to the fan rotor remains constant.
AFRIKAANSE OPSOMMING: Die uiteindelike doel van hierdie projek is om te verseker dat die beherende meganismes wat teenwoordig is wanneer vloeiversteurende komponente in die nabyheid van 'n aksiaalwaaier geinstalleer word, beter verstaan word. Die effek van verskillende parameters op die werkverrigting van aksiaalwaaiers word ondersoek. Hierdie parameters word verdeel in vloeiverbeterings- en vloeiverminderingseffekte. Die werkverrigting van 'n aksiaalwaaier kan verbeter word deur die lempuntspeling te verstel, deur 'n soliede skyf aan die naaf van die waaierrotor te installeer, of deur die aantal lemme te verander. Die vloeiverminderings word veroorsaak deur inlaatsiwwe, loopvlakke en hul ondersteuningsstrukture, warmteruilers en windwande. Die effekte van vloeiverbeteringskomponente word gemeet en vergelyk met die resultate van ander outeurs. Die sensitiwiteit van hierdie effekte op parameters soos die tipe rotor en die spesifieke stelsel waarin die rotor geinstalleer is, word uitgelig. Die stelseleffek (die interaksie tussen die rotor van die waaier en vloei weerstande wat naby mekaar geinstalleer is) van individuele, sowel as 'n kombinasie van verskillende komponente, word teoreties en eksperimenteel voorspel. Hierdie voorspellings word dan vergelyk met eksperimentele data wat van toepassing is op die komponente in 'n installasie waar stelseleffekte voorkom. Die resultate word gekoppel aan die kinetiese energievloedkoeffisient van die vloei by verskillende posisies binne die installasie. Eksperimentele data, verkry vanaf 'n volskaaleenheid (inlaatmondstukdiameter van 9,216 m), word met die geskaleerde data van die model (inlaatmondstukdiameter van 1,542 m) vcrgelyk. Die naaf- tot hulsverhouding van die aksiaalwaaiers wat ondersoek word is 0,15. Die belangrikste gevolgtrekkings is dat die werkverrigting van die tipe aksiaalwaaier wat ondersoek word verbeter kan word deur die lempuntspeling te verminder en deur 'n soliede skyf te installeer by die stroomaf kant van die rotor. 'n Toename in die aantal lemme van die waaier lei slegs tot marginale verbeterings in die werkverrigting van die waaier. Die totale werkverrigting van die stesel kan ook verbeter word deur sommige vloeiweerstandskomponente te verwyder, of deur hulle relatiewe posisies te verander. Al hierdie gevolgtrekkings is gebasseer op die aanname dat die drywingsinset na die waaierrotor konstant bly.
Williams, David A. "A 3-d model for the operation of a radiation pyrometer in an axial flow turbine". Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80097.
Pełny tekst źródłaMaster of Science
Shaik, Muneeb Ur Rahman. "Gas Dispersion Using an Up-Pumping Maxflo W Impeller". University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398961959.
Pełny tekst źródłaKosar, Jakub. "Konstrukční řešení reverzní vírové turbiny". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416611.
Pełny tekst źródłaLiufon, Zan Chan, i 呂馮仁成. "Flow Analysis of Axial Flow Pump with Different Impeller and Stator Blade Numbers". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/44254728611414543171.
Pełny tekst źródła華梵大學
機電工程學系博碩專班
96
In this study, flow fields of axial flow pumps with different numbers of rotating blade and different numbers of stator vane are analyzed. A commercial finite volume code, STAR-CD, is utilized to simulate the flow fields under the impeller rotating speed of 7000 rpm. The governing equations for the flow fields are conservation of mass and momentum equations. For the turbulence calculations, a high Reynolds number k-ε turbulence model is used. Multiple rotating frames and steady interaction technique have been used to simulate the flow fields. A total of four different pump designs are investigated in this study. The models’ variations include two different numbers of rotating impeller blade and two different numbers of stator guide vane. Model 1 has a cone shape hub and has 4 rotating blades with 6 stator vanes. Model 2 uses the same hub and rotating blades as model 1 but possesses 12 stator vanes. Model 3 and model 4 have a cone shape hub and 3 rotating blades. Model 3 has 6 stator vanes while model 4 has 12 stator vanes. The results show that model 2 possesses the best efficiency and model 1 is the 2nd and model 4 is 3rd while model 3 is the last . In terms of thrust force, model 2 has the highest value and model 1 is the 2nd and model 4 is 3rd while model 3 is the last . Regarding the effects of the number of stator vane, models with 6 stator vanes have higher flow rates but smaller torque and thrust force than those models with 12 stator vanes. Hence, efficiency is not directed related with flow rate. In addition, models with 12 stator vanes have higher torque and thrust force. Both three and four rotation blade impellers will produce cavitation. Cavitation phenomenon only occurs in rotating blade region but not in the guide vane region.
Shiu, Jiun Rung, i 許津榕. "Numerical Flow Analysis of Different Impeller Blade Edges and Stator Blade Numbers in An Axial Flow Pump". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/24256143854974267525.
Pełny tekst źródła華梵大學
機電工程研究所
93
In this study, flow analyses of axial flow pumps with different rotating impeller hub and blade designs and different number stator vanes are performed. A finite volume based code, STAR – CD, is utilized to simulate the flow fields under the impeller rotating speed of 8000 rpm. The governing equations for the flow fields are conservation of mass and momentum equations. For the turbulence calculations, a high Reynold number k-ε turbulence model is used. Multiple rotating frames and steady interaction technique have been used to simulate the flow fields. Five pump designs are investigated in this study. Model 1 to model 4 are different in hub shape, while model 4 and model 5 are different in stator’s guide vane number. Among them, the radius of hub of model 1 is unanimous in size, and the shape is like a cylinder. The model 2 has a smaller size of the hub with the shape of a cup. Model 3 has a even smaller sizer and has the shape of the funne1. Model 4’s hub has a similar funnel shape with model 3 but has different number of stator vane. Model 5 has the same hubs as model 4. Models 1,2,3,5 has a stator with 6 vanes. However, Model 4 has a stator with 12 guide vanes. The results show that model 1 possesses the best efficiency without considering cavitation. However, due to the fact the cavitation region of model 1 is significant, it is not a good choice. Model 3’s efficient is not as good as that of model 2. Although model 2 has a very good efficiency, however, its cavitation zone is bigger than that of models 4 and 5. In addition, model 4’s mechanical efficiency is better than model 2’s efficiency. It is found that model 4 with a stator of 12 guide vanes is superior to model 5 with a stator of 6 guide vanes in terms of overall efficiency. It is concluded that model 4 is the best choice because of its high efficiency and small region of cavitation.
He, Chih-Chieh, i 何智傑. "Flow Analysis of Axial Flow Pump with Different Impeller and Stator Designs". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20273587191318246030.
Pełny tekst źródła華梵大學
機電工程研究所
95
In this study, flow fields of axial flow pumps with different rotating impeller hub designs and different number stator vanes are analyzed. A commercial finite volume code, STAR-CD, is utilized to simulate the flow fields under the impeller rotating speed of 7000 rpm. The governing equations for the flow fields are conservation of mass and momentum equations. For the turbulence calculations, a high Reynolds number k-ε turbulence model is used. Multiple rotating frames and steady interaction technique have been used to simulate the flow fields. A total of four different pump designs are investigated in this study. The models’ variations include two different hub designs and two different numbers of stator guide vane. Model 1 has a cylindrical hub with 6 stator vanes. Model 2 uses the same hub as model 1 but possesses 12 stator vanes. Model 3 and model 4 have a cone shape hub. Model 3 has 6 stator vanes while model 4 has 12 stator vanes. The results show that model 1 possesses the best efficiency and model 2 is the 2nd and model 4 is 3rd while model 3 is last without considering cavitation. Due to the fact that cavitation region of model 1 is significant, it may not be the best choice. If we compare the torque and thrust force, model 4 obtains a higher torque and thrust force than model 1, although model 4’s efficiency is not as good as model 1. Moreover, if we compare the effects of the number of stator vanes, we can see that models with 6 stator vanes have higher flow rates but smaller torque and thrust force than those models with 12 stator vanes. Thus, efficiency is not directed related with flow rate. In addition, models with 12 stator vanes have higher torque and thrust force.
Hung, Jung-Chao, i 洪榮昭. "Five-axis Machining Process Planning Research for Axial-flow Compressor Impeller". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/6jm87e.
Pełny tekst źródła國立臺北科技大學
製造科技研究所
94
Five-axis numerically controlled machining has more recently been applied in national defence and motor vehicle industries to produce precisely complex surface parts, such as aerospace parts, impeller blades, dies and moulds. For promoting the application of five-axis machining technology, this research presents a milling process plan for machining the impeller blades was provided. The impeller of the axial-flow compressor contains a lot of thin blades on the hub of the impeller. In addition, the thin blades of the impeller possess overlapped surfaces and with large blade height/thickness ratio (about 20:1), so that the machining of the impeller is not easy. At the present time, the impeller machining usually adopts five-axis numerically controlled machines because of the tool motion has two additional degrees of freedom compared with traditional three-axis machining. In this paper, a new milling process method for thin blade with twisted ruled surfaces has presented. Our strategy is to change the tool orientation such that the overcut or undercut is minimized. Unigraphics CAD/CAM system, Procam system, and Vericut system were used to model the geometry of the impeller and to simulate and verify the cutting process in five-axis machine (X, Y, Z, A, and B axes). The validity and effectiveness of the blade milling process was demonstrated on Forestline five-axis machine with Num 1060M controller.
Lin, Yan-Hong, i 林彥宏. "Numerical Flow Analysis of The Impeller and Stator Regions in An Axial Flow Pump". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/27296642081692803942.
Pełny tekst źródła華梵大學
機電工程研究所
92
Axial flow pumps are widely used in a wide range of applications. The different designs of axial flow pump have different hydrodynamic efficiency and mechanical efficiency. In this study, we use a finite volume based code, STAR-CD, to simulate the flow fields in an axial flow pump under four different impeller rotating speeds, 5500 rpm, 6000 rpm, 6500 rpm, and 7000 rpm. The governing equations for the flow fields are conservation of mass and momentum equations. For the turbulence calculations, a high Reynold number k-ε turbulence model is used. Multiple rotating frames and steady interaction technique have been used to simulate the flow fields. Simulated results match the experimental observations of other investigators. The fluid flow in the axial flow pump rotates and accelerates by the impeller’s motion, while the stator van make it distribute smoothly and flow out from the nozzle. The flow fields are influenced by the boundary layer on impeller, stator vane and wall. Phenomena such as reversed flow, vortex are observed. When the fluid flows through the impeller, it will initiate reversed and separated flow because of the viscosity effects. The reversed and separated flow forms at the blade suction side and develops to the blade trail. It also interacts with the leakage flow and produces the leakage vortex. In the present study, we also conduct a analysis about hydrodynamic efficiency and mechanical efficiency of whole fluid field.
Sheng-TseWu i 吳昇澤. "Integrated Design of Axial-Flow Impeller and Novel Permanent Magnet Motor Based on 3D Printing". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ftg9xj.
Pełny tekst źródła"The measurement of axial turbine tip clearance flow phenomena in a moving wall annular cascade and in a linear cascade". Thesis, 1989. http://hdl.handle.net/10413/2060.
Pełny tekst źródłaThesis (M.Sc.)-University of Natal, Durban, 1989.
Oberholster, Abraham Johannes. "The application of Eulerian laser Doppler vibrometry to the on-line condition monitoring of axial-flow turbomachinery blades". Thesis, 2010. http://hdl.handle.net/2263/25794.
Pełny tekst źródłaThesis (PhD)--University of Pretoria, 2010.
Mechanical and Aeronautical Engineering
unrestricted
Park, Sang. "The Effects of the Back Clearance Size and the Balance Holes on the Back Clearance Flow of the Centrifugal Pump with Semi-Open Impeller". 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-89.
Pełny tekst źródła