Готові списки джерел за темами / SLANDED CONDITIONS

Добірка наукової літератури з теми "SLANDED CONDITIONS"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "SLANDED CONDITIONS"

Hanif, Muhammad Wali, and Mahboubullah Hamid. "Overlapping Penalties in the Jurisprudence of the Four Schools of Thought: A Comparative Jurisprudential Study." Journal of Humanities and Social Sciences Studies 5, no. 8 (August 15, 2023): 46–62. http://dx.doi.org/10.32996/jhsss.2023.5.8.7.

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The study of overlapping crimes and their punishment in Islamic jurisprudence deals with the issue of one person committing more than one crime, either at one time or in successive and different times. This crime may be of one gender, such as murder or theft, and a person may commit multiple crimes, such as stealing and drinking alcohol. This research looked at the opinions of the jurists in the penalties of such crimes. The research concluded that the jurists unanimously agreed that the criminal should not be punished if he committed several crimes of the same sex, except for one punishment only. For example, if the unmarried person commits the crimes of adultery and defamation, then one punishment is imposed on him, which is the punishment for adultery. The penalty of slander is included in it. If adultery is punished and then slandered after that, then the penalty of slander is applied to it as well. Overlapping means that the penalty for the lesser crime is included in the penalty for the major crime if they are committed together. In studying this subject, I followed the descriptive, analytical and comparative approach, where I explained the concept of overlap, its location, causes, and wording, the definition of punishment and its types, its wisdom and conditions, the penalties sections, the combination of crimes of one sex, the combination of crimes of different races, and how to fulfill multiple penalties, the principle Applications of multiple penalties with a statement of the sayings of the four schools of thought in each issue and a statement of the most correct of them.

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Li, Liulan, and Saminathan Ponnusamy. "Rotations and convolutions of harmonic convex mappings." Filomat 36, no. 11 (2022): 3845–60. http://dx.doi.org/10.2298/fil2211845l.

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In this paper, we mainly consider the convolutions of slanted half-plane mappings and strip mappings of the unit disk D. If f1 is a slanted half-plane mapping and f2 is a slanted half-plane mapping or a strip mapping, then we prove that f1 * f2 is convex in some direction if f1 * f2 is locally univalent in D. We also obtain two sufficient conditions for f1 * f2 to be locally univalent in D. Our results extend many of the recent results in this direction. Moreover, we consider a class of harmonic mappings including slanted half-plane mappings and strip mappings, and as a consequence, we prove that the any convex combination of such locally univalent and sense-preserving mappings is also convex.

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Liboiron, Max. "Care and Solidarity Are Conditions for Interventionist Research." Engaging Science, Technology, and Society 2 (May 25, 2016): 67. http://dx.doi.org/10.17351/ests2016.85.

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Calls for interventionist research in academic disciplines, including science and technology studies (STS), are increasingly common. Yet none offer insights for what to do or whom to turn to after a researcher has intervened and the result is slander, defaming, or disenfranchisement—even though these are possible, and even likely, results of intervening in controversies and power struggles. Drawing from the ethics and methods used in direct action activism, I argue that intentional networks of care and solidarity are necessary supports that need to be in place before we call for interventionist research.

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Tong, Zheming, Zhongqin Yang, Qing Huang, and Qiang Yao. "Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition." Energies 15, no. 5 (March 4, 2022): 1905. http://dx.doi.org/10.3390/en15051905.

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Increasing extreme rainfall events caused by global climate change have had a significant impact on urban drainage systems. As a critical component of a pumping station, a large-scale slanted axial-flow pump (SAFP) featuring high specific speed plays a critical role in mitigating urban flooding and waterlogging. In this study, to reveal the transient characteristics of a SAFP at shut-off conditions, a computational fluid dynamics (CFD) based approach with dynamic mesh was proposed. Multiple shut-off conditions with various shut-down speeds of the sluice gate (SG) were modeled. Our analysis demonstrated that both the shut-off conditions and the slanted structure have conspicuous impacts on the hydrodynamic performance of a SAFP. Reducing the shut-down speed leads to a greater reverse flow rate and higher runner speed. The water hammer effect was simulated with different shut-down speeds, increasing the water head by 5.07–10.42 m, the axial force by 163.46–297.06 kN∙m, and the axial moment by 116.05–224.01 kN∙m. Compared with the axial direction, moments in the radial directions were found with more obvious oscillation as a result of stronger rotor–stator interaction. Due to the gravitational effect of the slanted structure, the fluctuation of the runner in vertical direction presented an off-axis characteristic compared with the horizontal one. As the SG speed increased, pressure fluctuations gradually decreased at various locations across the SAFP.

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Zhang, Zhen Peng, Jin Qiu Shao, Xue Yan Sun, and Hui Jun Liu. "Simulation of Soil Water and Salt Transport with Sand Column in Coastal Saline Soil Based on COMSOL." Applied Mechanics and Materials 614 (September 2014): 668–71. http://dx.doi.org/10.4028/www.scientific.net/amm.614.668.

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In the paper, transport of water and Cl- under leaching was 2D-digitally simulated with COMSOL Multi-physics. In a two-dimensional transient cross-sectional model. COSMOL was used to investigate water and solute transport in the soil column coupled with variable sand column forms, with “a” denoting no sand column, “b” with one vertical middle sand column, “c “ with one long Slanted sand column, “d” with two long Slanted X-shaped sand columns. The parameters of the model were primarily based on the soil physical properties measured at coastal clay loam saline soil in Tianjin. The simulation results showed that, given same initial and same boundary conditions, sand column increased the transport efficiency of water and salt, which depends on the position and angle of sand column accordingly. The slanted columns were overall superior to the vertical ones in transport efficiency. In sum, “d” was the best type, “c” was the second best and “b” was the third, according to the efficiency of salt leaching and the efficiency of the utilization of water resources.

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Jiang, Zongliang, Gwanseob Shin, Jacklyn Freeman, Stephanie Reid, and Gary A. Mirka. "Lifting Performed on Laterally Slanted Ground Surfaces." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 49, no. 14 (September 2005): 1325–29. http://dx.doi.org/10.1177/154193120504901413.

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Many outdoor work environments (e.g. agriculture and construction) require manual material handling activities on variable grade ground surfaces. Quantifying biomechanical responses for lifting under these conditions may provide insight into the etiology of lifting-related injuries. The aim of the current study was to quantify the effect of laterally slanted ground surfaces on biomechanical responses. Ten subjects performed lifting exertions (using a 40% of max load) while standing on a platform that was laterally tilted at 0, 10, 20 and 30 degrees from horizontal. During the lifting tasks the whole body kinematics were collected, which were later used in a dynamic biomechanical model to calculate the time-dependent moment about L5/S1 and the time-dependent lateral forces acting on the body segments. The results showed a consistent reduction in the peak dynamic L5/S1 moment (decreased by 9%) and an increase in the lateral forces (increased by 111%) with increasing slant angle.

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Yang, Fan, Pengcheng Chang, Wenzhu Hu, Beibei Mao, Chao Liu, and Zhongbin Li. "Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads." Processes 9, no. 8 (August 14, 2021): 1404. http://dx.doi.org/10.3390/pr9081404.

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The 30° slanted axial-flow pump device is widely used in agricultural irrigation and urban drainage in plains areas of China. However, during the actual operation process, the 30° slanted axial-flow pump device is prone to vibration, noise, cracks in the blades, and other phenomena that affect the safe and stable operation of the pump device. In order to analyze the flow pressure pulsation characteristics of the 30° slanted axial-flow pump device under different flow conditions, the time–frequency domain analysis method was used to analyze the pressure pulsation of each flow structure of the 30° slanted axial-flow pump device. The results showed that the internal pulsation law of the elbow oblique inlet flow channel is similar. At the 1.2 Qbep condition, the amplitude fluctuation of the pressure pulsation was small, and the main frequency is 4 times the rotating frequency. The monitoring points at the outlet of the elbow oblique inlet flow channel were affected by the impeller rotation, and the pressure pulsation amplitude was larger than that inside the elbow oblique inlet flow channel. The pressure fluctuation of each monitoring point at the inlet surface of the impeller was affected by the number of blades. There were four peaks and four valleys, and the main frequency was 4 times the rotating frequency. The amplitude of pressure fluctuation increased gradually from the hub to the rim. The main frequency of pressure fluctuation at each monitoring point of the impeller outlet surface was 4 times of the rotating frequency, and the low frequency was rich. The amplitude of pressure fluctuation was significantly lower than that of the impeller inlet. With the increase of flow rate, the peak fluctuation of pressure coefficient decreased gradually, and the amplitude of pressure fluctuation tended to be stable. Under 0.8 Qbep and 1.0 Qbep conditions, the large fluctuation of the pressure fluctuation amplitude on the outlet surface of the guide vane was mainly affected by the low-frequency fluctuation. Under the 1.2 Qbep condition, the pressure fluctuation amplitude changed periodically.

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Fei, Zhaodan, Rui Zhang, Hui Xu, Jiangang Feng, Tong Mu, and Yaohui Chen. "Energy performance and flow characteristics of a slanted axial-flow pump under cavitation conditions." Physics of Fluids 34, no. 3 (March 2022): 035121. http://dx.doi.org/10.1063/5.0085388.

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Cavitation is a complex flow phenomenon that hinders the efficient, safe, and stable operation of hydraulic machinery. To investigate the effect of cavitation on energy performance and flow characteristics of hydraulic machinery, cavitating flow in a slanted axial-flow pump based on entropy production theory and vortex dynamics is studied. The results show that the impeller chamber is a primary region of cavitation and energy loss generation under different cavitation conditions, including the incipient, growing, and wedge-shaped cavitation stages. In the incipient cavitation stage, as degree of cavitation strengthens, the flow at the impeller blade is smooth with little cavitation, and the variation in entropy production is constant, resulting in a stable energy performance. As it evolves into the wedge-shaped stage, the cavitation grows from the tip region near the impeller blade to the hub. At this time, the entropy production increases in the impeller chamber, resulting in a drop in energy performance. Meanwhile, flow separation appears at the impeller blade, and a secondary tip leakage vortex is promoted. The region with high vorticity basically matches the region with the high local entropy production rate. According to the relative vorticity transport equation, compressibility of cavitation strongly affects the relative vorticity in the impeller chamber, indicating that cavitation indirectly increases entropy production and energy loss by affecting the vorticity distribution, resulting in the drop in energy performance.

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Cho, Sung-Woon, Jun-Hyun Kim, Doo Won Kang, Kangtaek Lee, and Chang-Koo Kim. "Single- and Multi-Directional Slanted Plasma Etching of Silicon under Practical Plasma Processing Conditions." ECS Journal of Solid State Science and Technology 3, no. 11 (2014): Q215—Q220. http://dx.doi.org/10.1149/2.0091411jss.

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Lazzi, G., S. S. Pattnaik, and O. P. Gandhi. "Experimental and FDTD-computed radiation patterns of cellular telephones held in slanted operational conditions." IEEE Transactions on Electromagnetic Compatibility 41, no. 2 (May 1999): 141–44. http://dx.doi.org/10.1109/15.765103.

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Дисертації з теми "SLANDED CONDITIONS"

JENA, RAVI KANTA. "POWER MANAGEMENT AND CO-ORDINATION CONTROL OF HYBRID AC DC MICROGRID IN GRID CONNECTED AND ISLANDED CONDITIONS." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/17064.

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In remote rural areas, which are far from the primary grid network, mostly renewable power generators are introduced and there is the chance of a fragile transmission line connection. The rapidly growing demand and grid integration of renewable energies has laid the foundation for ac / dc microgrid. DGs ' interconnection with the utility / grid through interlinking converters has raised concerns about secure operation and equipment surveillance. The microgrid can be meant for the client to satisfy their needs and requirements; for example, improving local reliability, minimizing feeder losses, supporting local voltages, enhancing utilization by using waste heat, tension decrease or continuous power supply. The work's objective is to reconstitute control switching to suffer minimal transients in the microgrid. MATLAB / SIMULINK simulates the project. This report introduces a decentralized mechanism of power management for the hybrid microgrid to coordinate and promote the interacted sub-grids. First, considering the features of the popular bus setup, a Pdc − v2 dc droop control approach is suggested to sustain the common bus voltage and obtain energy sharing among storage sub grids. Secondly, as the interaction between numerous sub-grids is more problematic than the standard hybrid, a coordinated energy control strategy based on common bus voltage, ac sub-grid frequency, and dc sub- grid voltage is intended for the BADCs and BDDCs to grasp the power interaction between varying sub-grids. In addition, the proposed strategy reflects the capacities and load types of each sub grid; consequently, it is still necessary when sub grid capacities are not matched, and it can ensure the power quality of the sub grids with a high proportion of critical loads. This work suggests a revised topology of a hybrid ac / dc microgrid, where bidirectional ac / dc converters (BADCs) and bidirectional dc / dc converters (BDDCs) connect numerous sub- grids in the framework to the common bus.

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Книги з теми "SLANDED CONDITIONS"

Schousboe, Karen. Slangen i paradiset: Unges holdninger til fremtiden. [Copenhagen]: Instituttet for fremtidsforskning for Undervisningsministeriet, 1990.

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A New England prison diary: Slander, religion, and markets in early America. Ann Arbor: The University of Michigan Press, 2012.

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Disobedience, slander, seduction, and assault: Women and men in Cajamarca, Peru, 1862-1900. Austin, TX: University of Texas Press, 2005.

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Butterworth, Emily. Poisoned words: Slander and satire in early modern France. London: Legenda, 2006.

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Carneiro, Deivy Ferreira. Uma justiça que seduz?: Ofensas verbais e conflitos comunitárias em Minas Gerais (1854-1941). Jundiaí, SP: Paco editorial, 2019.

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John, March. March's Actions for slander: And, Arbitrements : the first, being a collection, under certain grounds and heads, of what words are actionable in the law, and what not, where an action "de scandalis magnatum will lie, and of the nature of a libel : the other, a discourse, shewing what arbitrements are good in law, and what not, together with directions, and presidents of conditions to perform awards, indentures of submission to awards, with covenants to perform the same, arbitrements of lands which the parties covenant to perform, or of debt, &c. upon submission by bond, and variety of pleadings therein : as also, certain quaeries, or doubtful cases, under proper titles, with the books cited pro and contra, very useful for all students in the law. London: Printed for Elizabeth Walbanck, 1992.

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Witch hunt: A true story of social hysteria and abused justice. New York: Avon Books, 1998.

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Kollmann, Nancy Shields. By honor bound: State and society in early modern Russia. Ithaca, N.Y: Cornell University Press, 1999.

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Kollmann, Nancy Shields. By honor bound: State and society in early modern Russia. Ithaca, N.Y: Cornell University Press, 1999.

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Sŏn'gŏ wa p'yohyŏn ŭi chayu. Taehan Min'guk, Sŏul: K'ŏmyunik'eisyŏn Puksŭ, 2015.

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Частини книг з теми "SLANDED CONDITIONS"

Kamali, Mohammad Hashim. "Slanderous Accusation (Qadhf)." In Crime and Punishment in Islamic Law, 150–56. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190910648.003.0009.

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The chapter begins with a definition of slander (qadhf) and the typical expressions that carry its meaning. This is followed by juristic opinions on the characteristics of this offence, whether it belongs to the Right of Man or Right of God category of offences, and the conditions attached to the enforcement of punishment.

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Trollope, Anthony. "The Carbury Family." In The Way We Live Now. Oxford University Press, 2016. http://dx.doi.org/10.1093/owc/9780198705031.003.0004.

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Something of herself and condition Lady Carbury has told the reader in the letters given in the former chapter, but more must be added. She has declared she had been cruelly slandered; but she has also shown that she was not a woman whose...

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Ahmadi Moghaddam, Hadi, Matthew Phillips, Svetlana Tkachenko, and Victoria Timchenko. "Influence of Wind Incidence Angle on the Cooling of Rooftop-mounted Solar Panels." In Solar PV Panels - Recent Advances and Future Prospects [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109610.

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The cooling of PV panels is crucial because their electrical output and lifespan are adversely affected as their operating temperature rises. Considering wind current cooling impacts on the rooftop-mounted solar panels, adopting the local climate conditions such as dominant wind patterns is recommended to the building sector so that new buildings are placed considering the local wind directions. A 3D CFD model employing the URANS approach is developed to show the impacts of wind direction on the cooling rate of a PV panel installed on the surface of a slanted roof. The radiation effect is considered using the surface-to-surface radiation model. Two free stream velocities of 2 and 5 m/s and seven wind angles between 0 and 180 degrees are modelled. The results showed an optimum incidence angle at which the panel experiences lower temperatures. At wind angles below 90 degrees where there is direct contact between the wind flow and PV surfaces, the convective cooling rate is higher which in turn decreases the PV temperature. However, at higher angles, due to the presence of walls and edges of the structure, the wind flow is redirected resulting in the formation of wind flow separation. Therefore, convective cooling degrades, and PV experiences higher temperatures.

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Тези доповідей конференцій з теми "SLANDED CONDITIONS"

Jang, Hyun-Min, Doo-Ho Cho, Jae-Boong Choi, Young-Jin Kim, Nam-Su Huh, Do-Jun Shim, Young-Hwan Choi, and Jeong-Soon Park. "Plastic Limit Loads for Slanted Circumferential Through-Wall Cracked Pipes Based on Finite Element Limit Analysis." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57583.

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Based on detailed three-dimensional (3-D) finite element (FE) limit analyses, the plastic limit load solutions for pipes with slanted circumferential through-wall cracks (TWCs) subjected to axial tension, global bending and internal pressure are reported. The FE model and analysis procedure employed in the present numerical study were validated by comparing the present FE results with existing solutions for plastic limit loads of pipes with idealized TWCs. To quantify the effect of slanted crack on plastic limit load, the slant correction factors for calculating plastic limit loads of pipes with slanted TWCs from pipes with idealized TWCs were newly proposed via extensive 3-D FE calculations. These slant correction factors are presented in a tabulated form for practical ranges of geometry and each loading conditions. Moreover, the present FE plastic limit loads were also compared with the existing solutions of pipes with slanted TWCs. These FE plastic limit load solutions can be applied to estimate elastic-plastic fracture mechanics parameters and creep fracture mechanics parameters, such as elastic-plastic J–integral and crack opening displacement, creep C*-integral and creep crack opening displacement, based on the reference stress concept considering more realistic crack shape.

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Mehta, Naitik J., and Dara W. Childs. "Measured Comparison of Leakage and Rotordynamic Characteristics for a Slanted-Tooth and a Straight-Tooth Labyrinth Seal." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94035.

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Measured results are presented to compare rotordynamic coefficients and leakage of a slanted-tooth labyrinth seal and a straight-tooth labyrinth seal. Both seals had identical pitch, depth, and number of teeth. The teeth inclination angle of the teeth on the slanted-tooth labyrinth was 65° from the normal axis. Experiments were carried out at an inlet pressure of 70 bar-a (1015 psi-a), pressure ratios of 0.4, 0.5, and 0.6, rotor speeds of 10.2, 15.35, and 20.2 krpm, and a radial clearance of 0.2 mm (8 mils). One zero and two positive inlet preswirl ratios were used. The results show only minute difference in the rotordynamic coefficients between the two seals. The slanted-tooth labyrinth seal consistently leaked approximately 10% less at all conditions. Predictions were made using a one control volume bulk-flow model (1CVM) which was developed for a straight-tooth labyrinth seal design. 1CVM under-predicted the rotordynamic coefficients and the leakage.

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Huh, Nam-Su, Do-Jun Shim, Ji-Ho Kim, Gery M. Wilkowski, and Jun-Seok Yang. "Stress Intensity Factors of Slanted Through-Wall Cracks in Plate and Cylinder." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26209.

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For Leak-Before-Break (LBB) analysis of nuclear piping, a circumferential through-wall crack (TWC) with the crack front parallel to the cylinder radius is typically postulated, i.e., an idealized TWC. Such assumption simplifies the LBB analysis significantly. However, in reality, an internal surface crack grows through the wall thickness and penetrates through the wall thickness at the deepest point. Hence, a TWC with different crack lengths at inner and outer surfaces is formed. Such a TWC is referred to as a “slanted TWC” in the present study. Leak rates as well as SCC and fatigue crack growth rates of slanted TWC are expected to be quite different from those of postulated idealized TWC. In this context, characterization of the actual TWC shape during crack growth due to fatigue or stress corrosion cracking is essential for accurate LBB analysis. Based on detailed 3-dimensional (3-D) elastic finite element (FE) analyses, the present paper provides stress intensity factors (SIFs) for plates and cylinders with slanted TWCs. As for loading conditions, axial tension was considered for the plates, whereas axial tension and global bending were considered for the cylinders. In order to cover the practical range of crack sizes, the geometric variables affecting the SIF were systematically varied. Based on FE analysis results, SIFs along the crack front, including the inner and outer surface points, were provided. The SIFs of slanted TWC can be used to evaluate the fatigue crack growth of a TWC and to perform detailed LBB analysis considering a more realistic crack shape.

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Moharam, M. G. "Bragg condition for asymmetric dielectric surface-relief gratings." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tub5.

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Holographic planar gratings are fabricated by inducing perturbation in the refractive index (permittivity) in the medium. The Bragg condition for slanted or unslanted holographic gratings is given by 2nL cos(ϕ ‒ θ) = λ0, where L is the grating period, ϕ is the slant angle, θ is the angle of incidence measured in the grating medium, λ0 is the free-space wavelength, n is the refractive index of the grating medium neglecting the grating modulation. This approximation is generally valid since the index does not vary through the grating thickness and the index modulation is very small. Surface-relief gratings are fabricated by producing periodic perturbation in the surface of the grating medium. The above Bragg condition may be used for symmetric surface-relief gratings (ϕ = 90) in the form 2L sinθ0 = λ0, where θ0 is the angle of incidence in air. For asymmetric gratings, the average refractive index or permittivity of the grating varies though the grating thickness and is significantly different from the refractive indices of two regions forming the grating. The slant angle of the grating and the grating period needed in the Bragg condition are not defined. In this work, a condition for maximum diffraction efficiency for asymmetric surface-relief gratings is proposed. The predicted angles of incidence for maximum diffraction efficiency for several grating profiles are compared with the exact angles obtained using the rigorous coupled-wave analysis. Satisfactory agreement is shown for both TE and TM polarization for the various grating profiles considered. The proposed condition is shown to be a reliable indicator of the maximum efficiency.

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San, A. N., R. Ben Mrad, and P. Sullivan. "Fluid Flow Behaviour in Microneedle Arrays." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75162.

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This paper examines the geometries of basic straight microneedle arrays, slanted channel arrays with varying angles, and arrays with diverging and converging interior cross sections for the purpose of interstitial fluid extraction and transdermal drug delivery. Flow behaviour is analyzed under biometric pressure driven conditions including frictional losses, minor losses due to the array geometry, and losses due to electrokinetic effect in microchannels. This paper also presents design and fabrication details of preliminary work that will lead to a design for microneedle arrays.

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Dhadwal, Harbans S., and Anatole P. Kurkov. "Dual-Laser Probe Measurement of Blade-Tip Clearance." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-183.

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This paper describes two dual-laser probe integrated fiber optic systems for measuring blade tip clearance in rotating turbomachinery. The probes are nearly flush with the casing inner lining resulting in minimal flow disturbance. The two probes are closely spaced in a circumferential plane and are slanted at an angle relative to each other so that the blade tip traverse time of the space between the two laser beams varies with the tip radius allowing determination of the tip clearance at the rotor operating conditions. The tip clearance can be obtained for all the blades in a rotor with a single system, provided there are no synchronous vibrations present at a particular operating condition. These probes were installed in two holders; one provided an included angle between the probes of 20 degrees, and the other provided an included angle of 40 degrees. The two configurations were calibrated in a vacuum spin rig facility that is capable of reproducing realistic blade tip speeds.

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Yang, Dong, and Aimee S. Morgans. "Low-Order Network Modeling for Annular Combustors Exhibiting Longitudinal and Circumferential Modes." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76506.

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Modern gas turbine combustors often have annular geometries. These are able to sustain thermoacoustic modes which vary in both the longitudinal and circumferential directions. Effects such as nonlinearity of the flame response to perturbations and differing burners around the annulus lead to the coupling of acoustic modes with different circumferential mode numbers. Such coupling renders differing spatial patterns of instability possible — for example purely longitudinal modes, circumferential standing modes, circumferential spinning modes, mixed modes and slanted modes. Accurately predicting the spatial pattern of limit cycle oscillations resulting from thermoacoustic instability remains an open challenge. This work develops a frequency domain low-order thermoacoustic network model for annular combustors which is notable in (i) accounting for both longitudinal and circumferential modes and (ii) allowing for generic acoustic boundary conditions at either end of the network. Linear acoustic waves are considered, with the different circumferential wavenumbers decoupled for sections both before and after the flames. Modal coupling occurs only at the flames, and is accounted for by summing all modal contributions prior to application of the flame models, and decomposing back into circumferential modes after application of flow conservation equations across the flames. By applying acoustic boundary conditions at either end of the network, an eigenvalue system is established which allows the thermoacoustic modes of the whole combustion system to be analysed. This low order modelling approach is applied to a simplified annular combustor set-up and is demonstrated to be able to capture limit cycles exhibiting longitudinal modes, circumferential spinning modes, circumferential standing modes and even the recently identified slanted modes.

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Traboulay, Vaughn Reza, Tint Htoo Aung, Cedric Manzoleloua, Balakrishnan Panamarathupalayam, Carmelo Arena, Allwyn DMello, Linus Sebelin, and Clotaire Eyaa. "A Novel Water-Based Drilling Fluid Tailored for Challenging Slanted HTHP Wells." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202178-ms.

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Abstract High-temperature water-based drilling fluid systems hold several advantages over synthetic based systems from financial and environmental viewpoints. However, most conventional water-based systems start to become unstable at temperatures above 300 degF. This paper details the design and implementation of A Novel Water-Based Drilling Fluid that meet these temperature stability requirements. The newly developed high-temperature water-based system discussed in this paper utilizes a custom-made branched synthetic polymer that exhibits superior rheological properties and fluid loss control as well as long term stability above 400 degF. The branched synthetic polymer is compatible with most oilfield brines and maintains excellent low-end rheology necessary for hole cleaning and solids suspension under high-temperatures and pressures. Under static conditions, the high-temperature fluid shows no gelation resulting in lower swab surge pressures while the stability of the highly branched synthetic polymer and enhanced rheological profile minimize sag. To drill a challenging exploration well, a Middle East client required a cost-effective drilling fluid system which remains stable under static temperatures expected to exceed 375 degF. The long-term stability of the system was critical for successful wireline logging operations. In addition, the system was required to provide shale inhibition, hydrogen sulfide suppression and sufficient density (above 16.5 lbm/galUS) to maintain well integrity while drilling through anticipated high-pressure zones. The challenging intermediate (12.25-in and 8.375-in) and reservoir (6-in) sections were successfully drilled and evaluated using this new branched synthetic polymer-based system. Fluid property trends and system treatments will be detailed alongside thermal stability data for extended periods required for wireline logging (up to 9 days static). This paper will discuss how proper laboratory design of the high-temperature water-based system was translated to excellent field performance and will indicate how this technology can be utilized for future campaigns in the region and worldwide.

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Andrei, L., A. Andreini, C. Bianchini, B. Facchini, and L. Mazzei. "Numerical Analysis of Effusion Plates for Combustor Liners Cooling With Varying Density Ratio." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95039.

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Effusion cooling technology has been assessed in past years as one of the most efficient methods to maintain allowable working temperature of combustor liners. Despite many efforts reported in literature to characterize the cooling performances of those devices, detailed analysis of the mixing process between coolant and hot gas are difficult to perform especially in case superposition and density ratio effects become important. Furthermore, recent investigations on the acoustic properties of these perforations pointed out the challenge to maintain optimal cooling performance also with orthogonal holes which showed higher sound absorption. This paper performs a CFD analysis of the flow and thermal field associated with adiabatic wall conditions to compute the cooling effectiveness. The geometry consists of an effusion cooling plate drilled with 18 holes and fed separately with a cold and hot gas flow. Two types of perforations equivalent in porosity and pitches are investigated to assess the influence of the drilling angle between 30 and 90 deg. The reference conditions considered in this work comprehend an effective blowing ratio ranging between 1 and 3 at isothermal conditions (reaching a maximum hole Reynolds number of 10000) and high inlet turbulence intensity (17%). This set of conditions was exploited to perform a validation of the numerical procedure against detailed experimental data presented in another paper. Inlet turbulence effects highlighted by measurements for the slanted perforation were also investigated simulating a low turbulence condition corresponding to 1.6% of intensity. Furthermore the nominal DR = 1.0 was increased up to 1.7 to expand the available data set towards typical working conditions for aero-engines. Steady state RANS calculations were performed with the commercial code ANSYS® CFX, modeling turbulence by means of the k — ω SST. In order to include anisotropic diffusion effects due to turbulence damping in the near wall region, the turbulence model is corrected considering a tensorial definition of the eddy viscosity with an algebraic correction to dope its stream-span components. Computational grids were finely clustered close to the main plate and inside the holes to obtain y+ < 1, to maximize solver accuracy according to previous similar analysis.

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Palomba, C., P. Puddu, and F. Nurzia. "3D Flow Field Measurement Around a Rotating Stall Cell." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-594.

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Rotating stall is an unsteady phenomenon that arises in axial and radial flow compressors. Under certain operating conditions a more or less regular cell of turbulent flow develops and propagates around the annulus at a speed lower than rotor speed. Recently little work has been devoted to the understanding of the flow field pattern inside a rotating cell. However, this knowledge could be of help in the understanding of the interaction between the cell and the surrounding flow. Such information could be extremely important during the modelling process when some hypothesis have to be made about the cell behaviour. A detailed experimental investigation has been conducted during one cell operation of an isolated low-speed axial flow compressor rotor using a slanted hot wire and an ensemble average technique based on the cell revolution time. The three flow field components have been measured on 9 axial section for 800 circumferential points and on 21 radial stations to give a complete description of the flow field upstream and downstream of the rotor. Interpretation of data can give a description of the mean flow field patterns inside and around the rotating cell.

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