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Effects of Width Variation of Pressure-Side Winglet on Tip Flow Structure in a Transonic Rotor

Journal of Thermal Science 2022年第1期31卷 141-150页

作者： CUI Weiwei WANG Xinglu YAO Fei ZHAO Qingjun liu Yuqiang liu leinan WANG Cuiping YANG Laishun College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Light-duty Gas-turbine Chinese Academy of SciencesBeijing 100190China Key Laboratory of Civil Engineering Disaster Prevention and Mitigation of Shandong Province Qingdao 266590China Clean Energy Laboratory Shandong University of Science and TechnologyQingdao 266590China

Tip leakage flow has become one of the major triggers for rotating stall in tip region of high loading transonic compressor rotors.Comparing with active flow control method,it’s wise to use blade tip modification to enlarge the stable operating range of rotor.Therefore,three pressure-side winglets with the maximum width of 2.0,2.5 and 3.0 times of the baseline rotor,are designed and surrounded the blade tip of NASA rotor 37,and the three new rotors are named as RPW1,RPW2,and RPW3 respectively.The numerical results show that the width of pressure-side winglet has significant influence on the stall margin and the minimum throttling massflow of rotor,while it produces less effect on the choking massflow and the peak efficiency of new rotors.As the width of the pressure-side winglet increases from new rotor RPW1 to RPW3,the strength of leakage massflow has been attenuated dramatically and a reduction of 20%in leakage massflow rate has appeared in the new rotor RPW3.By contrast,the extended blade tip caused by winglet has not introduced much more aerodynamic losses in tip region of rotor,and the new rotors with different width of pressure-side winglet have the similar peak efficiency to the baseline.The new shape of the leakage channel over blade tip which replaces of the static pressure difference near blade tip has dominated the behavior of the leakage flow in tip gap.As both the new aerodynamic boundary and throat in tip gap have reshaped by the low-velocity flow near the solid wall of extended blade tip,the discharging velocity and massflow rate of leakage flow have been suppressed obviously in new rotors.In addition,the increasing inlet axial velocity at the entrance of new rotor has increased slightly as well,which is attributed to the less blockage in the tip region of new rotor.In consideration of the increased inlet axial velocity and the weakened leakage flow,the new rotor presents an appropriately linear increase of the stall margin when the width of pressure-side winglet increases,and has a nearly 15%incre

关键词： pressure-side winglet blade tip aerodynamic losses leakage channel stall margin

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端粒复合体与冠心病的研究进展

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中国心血管杂志 2016年第1期21卷 69-72页

作者：张磊楠田然刘震宇沈珠军方全张抒扬中国医学科学院北京协和医学院北京协和医院心内科北京100730

端粒复合体由端粒DNA、端粒相关蛋白、端粒酶共同构成,是维持染色体DNA稳定的重要结构。多种心血管危险因素和不良生活方式均可造成端粒缩短加快,而健康的生活方式及他汀类药物则可减缓端粒缩短。在细胞、动物等研究基础上,多项端粒复... 详细信息

端粒复合体由端粒DNA、端粒相关蛋白、端粒酶共同构成,是维持染色体DNA稳定的重要结构。多种心血管危险因素和不良生活方式均可造成端粒缩短加快,而健康的生活方式及他汀类药物则可减缓端粒缩短。在细胞、动物等研究基础上,多项端粒复合体与冠心病相关的临床研究,阐明了端粒复合体功能失调在冠心病的发生、发展、预后中起到的重要作用。冠心病患者外周血白细胞端粒长度明显缩短,端粒长度短是心血管事件再发的一个独立的危险因素,具有预测心血管事件预后的价值。目前,针对端粒长度缩短与冠心病相关的机制、端粒相关蛋白与冠心病的相关性以及白细胞亚群的研究等方面尚有研究空间。

关键词：冠状动脉疾病端粒端粒相关蛋白端粒酶

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