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Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

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水动力学研究与进展B辑:英文版 2023年第3期35卷 516-532页

作者： Rui-wen Zhao Angus C.W.Creech Ye Li vengatesan venugopal Alistair G.L.Borthwick Laboratory of Multi-function Towing Tank State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Engineering and Physical Sciences Heriot-Watt UniversityEdinburghUK School of Engineering The University of EdinburghEdinburghUK School of Engineering Computing and MathematicsUniversity of PlymouthPlymouthUK

In this paper,we present a numerical model of a vertical-axis turbine(VAT)with active-pitch torque *** model is based upon the Wind and Tidal Turbine Embedded Simulator(WATTES)and WATTES-V turbine realisations in conjunction with the actuator line method(ALM),and uses OpenFOAM to solve the unsteady Reynolds-averaged Navier-Stokes(URANS)equations with two-equation k-εturbulence *** novel pitch-controlled system is based on an even pressure drop across the entire rotor to mitigate against dynamic stall at low tip speed *** numerical model is validated against experimental measurements and alternative numerical predictions of the hydrodynamic performance of a 1:6 scale UNH-RM2 hydrokinetic *** deploying the variable pitch mechanism exhibit improved turbine performance compared to measured data and fixed zero-pitch model ***-wake characteristics are investigated by examining the vorticity distribution near the *** pitch-controlled system is demonstrated to theoretically decrease turbulence generated by turbine rotations,mitigate the intensity of vortex shedding and size of detached vortices,and significantly enhance the performance of a vertical-axis hydrokinetic turbine for rated tip-speed ratios.

关键词： Vertical-axis turbine pitch control hydrodynamic performance unsteady Reynolds-averaged Navier-Stokes(URANS) numerical simulation

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自由水面式半圆体开孔海洋结构物水动力性能实验研究

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大连理工大学学报 2012年第5期52卷 713-718页

作者：翟钢军马哲 Teh Hee-min vengatesan venugopal 大连理工大学深海工程研究中心辽宁大连116024 爱丁堡大学能源系统研究所

提出了自由水面式半圆体开孔这一海洋结构物的新型式,并对该型式结构物进行了不同水深、不同模型浸水深度,以及不同波高和周期下系统的规则波及不规则波的模型实验研究.对结构物的透射系数Ct、反射系数Cr以及能量耗散系数Cl进行了系统总... 详细信息

提出了自由水面式半圆体开孔这一海洋结构物的新型式,并对该型式结构物进行了不同水深、不同模型浸水深度,以及不同波高和周期下系统的规则波及不规则波的模型实验研究.对结构物的透射系数Ct、反射系数Cr以及能量耗散系数Cl进行了系统总结.通过研究发现自由水面式半圆体开孔海洋结构物的消波性能随着模型相对水深以及相对板宽的增加而增强;并且该结构具有较小的波浪反射率以及较好的能量耗散效果,适合在海岸基础设施中推广建造.

关键词：半圆体开孔式海洋结构物水深规则波不规则波

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Relationship between T-lymphocyte cytokine levels and sero-response to hepatitis B vaccines

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World Journal of Gastroenterology 2008年第22期14卷 3534-3540页

作者： Vijayakumar Velu Shanmugam Saravanan Subhadra Nandakumar Esaki Muthu Shankar Appasamy vengatesan Suresh Sakharam Jadhav Prasad Suryakant Kulkarni Sadras Panchatcharam Thyagarajan Department of Medical Microbiology Dr ALM PGIBMS University of Madras Chennai 600113 and National Referral Centre for Viral Hepatitis India Vaccine Research Centre Department of Microbiology and Immunology Emory University Atlanta Georgia 30329 United States Department of Medical Microbiology Dr ALM PGIBMS University of Madras Chennai 600113 and National Referral Centre for Viral Hepatitis India the YRG Centre for AIDS Research and Education VHS campus Taramani Chennai 600113 India Department of Medical Microbiology Dr ALM PGIBMS University of Madras Chennai 600113 and National Referral Centre for Viral Hepatitis India Clinical Epidemiology Unit Stanley Medical College Chennai 600001 Tamilnadu India Serum Institute of India Ltd. Pune India Department of Medical Microbiology Dr ALM PGIBMS University of Madras Chennai 600113 and National Referral Centre for Viral Hepatitis India Sri Ramachandra University Porur Chennai 600113 India the YRG Centre for AIDS Research and Education VHS campus Taramani Chennai 600113 India

AIM: To investigate the cellular defects by analyzing the (Th1/Th2) cytokine levels in vaccine responders and non-responders. METHODS: Peripheral blood mononuclear cell (PBMC) from responders and non-responders were stimulated with or with out recombinant HBsAg or PHA. Broad spectrum of cytokines viz (Th1) IFN-γ, IL-2, TNF-α, IL-12 and (Th2) IL-10, IL-4 were measured after in vitro stimulation with recombinant HBsAg and were compared with respective antibody titers. RESULTS: A significant decrease (P = 0.001) in Th1 and Th2 cytokines namely, IL-2, INF-γ, TNF-α and IL-10in non-responders was observed. The level of IL-4 was not significant between the three groups. Furthermore, despite a strong Th1 and Th2 cytokine response, the level of IL-12 was elevated in high-responders compared to other groups (P = 0.001) and demonstrated a positive correlation with anti-HBs titers and Th1 cytokine response. CONCLUSION: Our findings suggest that unrespon-siveness to recombinant hepatitis B vaccines (rHB) is multifactorial, including specific failure of antigen presentation or the lack of both T helper Th1 and Th2 response.

关键词：乙肝疫苗细胞活类素液体反应 T细胞反应

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