Realization and verification of the flow characteristic experiment in rotating two-pass square duct with smooth walls
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摘要: 针对涡轮叶片的蛇形内冷通道内流阻特性的研究,在北京航空航天大学航空发动机气动热力国家级重点实验室的旋转涡轮叶片内冷通道换热实验台上构建了旋转工况的测压系统.该测压系统具有高精度、多路选通、高压高旋转数等特点.在通道进口雷诺数从20000~70000,旋转数从0~1.025的范围内,实验研究了旋转状态下,冷态与热态流场下方形截面光滑U形通道流阻系数.实验结果与国外同类实验对比验证了构建的实验系统的可靠性和优越性.实验结果表明:低雷诺数下静止工况的流阻随雷诺数增大而增大,并在雷诺数增大到一定值后转而减小.冷态下流阻随旋转数增大而增大,低旋转数下旋转对热态流阻影响并不显著,高旋转数下热态流阻随旋转数增大而显著增大.Abstract: In order to investigate the pressure and flow characteristics of the rotating channels, a new measurement system was invested and implemented in National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics of Beijing University of Aeronautics and Astronautics. The new measurement system with high measurement accuracy and plural air channels could reach high Rotation numbers by increasing the back pressure of test section. The Reynolds and Rotation numbers ranged from 20000 to 70000 and 0 to 1.025 respectively. The investigation used different temperature ratio conditions to investigate the pressure and flow characteristics of the rotating two-pass square duct with smooth walls. The results proved the reliability and superiority of the measurement system by comparing with similar experiments in foreign countries. The result showed that the static flow resistance increased with the increasing Reynold number, and decreased when the Reynold number was high enough. In cold conditions, the flow resistance increased with the increasing Rotation number. In thermal state, the flow resistance showed no obvious change in low Rotation number, and increased significantly with the increasing Rotation number in high Rotation number.
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[1] Liou T M,Chang S W,Hung J H,et al.High rotation number heat transfer of a 45 degrees rib-roughened rectangular duct with two channel orientations[J].International Journal of Heat and Mass Transfer,2007,50(19/20):4063-4078. [2] ZHOU Fuguo,Lagrone J,Acharya S.Internal cooling in 4∶1 AR passages at high rotation numbers[J].Journal of Heat Transfer,2007,129(12):1666-1675. [3] Huh M,Jiang L,Han J C.Influence of channel orientation on heat transfer in a two-pass smooth and ribbed rectangular channel (AR=2∶1) under large rotation numbers[R].ASME Paper GT2010-22190,2010. [4] Chang V S W,Liou T M,Po Y.Coriolis and rotating buoyancy effect on detailed heat transfer distributions in a two-pass square channel roughened by 45° ribs at high rotation numbers[J].International Journal of Heat and Mass Transfer,2010,53(7):1349-1363. [5] Michael H,Liu Y H,Han J C.Effect of rib height on heat transfer in a two pass rectangular channel (AR=1∶4) with a sharp entrance at high rotation numbers[J].International Journal of Heat and Mass Transfer,2009,52(19):4635-4649. [6] Liou T M,Chang S W,Chen J S,et al.Influence of channel aspect ratio on heat transfer in rotating rectangular ducts with skewed ribs at high rotation numbers[J].International Journal of Heat and Mass Transfer,2009,52(23):5309-5322. [7] 王宝官,王武,吉洪湖.模拟涡轮叶片内部冷却通道方管和收缩管换热的实验研究[J].工程热物理学报,1997,18(5):608-611. WANG Baoguan,WANG Wu,JI Honghu.Experimental in vestigation of heat transfer simulation in the turbine blade with rotating square and taper tubes[J].Journal of Engineering Thermophysics,1997,18(5):608-611.(in Chinese) [8] 邓宏武,陶智,徐国强,等.旋转状态下有转角带肋U形通道内换热实验研究[J].大连理工大学学报,2001,41(1):38-41. DENG Hongwu,TAO Zhi,XU Guoqiang,et al.Experimental investigation on heat transfer within a rotating ribbed serpentine passage with stagger angles[J].Journal of Dalian University of Technology,2001,41(1):38-41.(in Chinese) [9] 邓宏武,魏喆,陶智,等.旋转状态下蛇形通道内流动与换热的机理研究[J].航空学报,2005,26(4):411-416. DENG Hongwu,WEI Zhe,TAO Zhi,et al.Study on mechanism of turbulent flow and heat transfer in rotating passages[J].Acta Aeronautica et Astronautica Sinica,2005,26(4):411-416.(in Chinese) [10] 刘传凯,陶智,丁水汀,等.旋转对光滑U形通道内换热的影响研究[J].航空动力学报,2006,21(3):512-517. LIU Chuankai,TAO Zhi,DING Shuiting,et al.Effect of rotation on heat transfer in a rotating U-shaped passage[J].Journal of Aerospace Power,2006,21(3):512-517.(in Chinese) [11] 刘传凯.旋转回转通道内冷气流动与换热机理研究[D].北京:北京航空航天大学,2006. LIU Chuankai.Study on fluid flow and heat transfer in rotating serpentine cooling channels[D].Beijing:Beijing University of Aeronautics and Astronautics,2006.(in Chinese) [12] Huh M,Lei J,Liu Y H,et al.High rotation number effects on heat transfer in a rectangular (AR=2∶1) two-pass channel[J].Journal of Turbomachinery,2010,133:021001.1- 021001.11. [13] Prabhu S V,Vedula R P.Pressure drop characteristics in a rotating smooth square channel with a sharp 180° bend[J].Experimental Thermal and Fluid Science,2000,21(4):198-205. [14] 程俊华,倪彬,邓宏武,等.高旋转数通道换热实验技术及验证[J].航空动力学报,2014,29(8):1817-1823. CHEN Junhua,NI Bin,DENG Hongwu,et al.Experimental technique of heat transfer in rotating channels at high rotation numbers[J].Journal of Aerospace Power,2014,29(8):1817-1823.(in Chinese) [15] DENG Hongwu,QIU Lu,TAO Zhi.Heat transfer study in rotating smooth square U-duct at high rotation numbers[J].International Journal of Heat Transfer and Mass Transfer,2013,66(11):733-744. [16] QIU Lu,DENG Hongwu,SUN Jining,et al.Pressure drop and heat transfer in rotating smooth square U-duct under high rotation numbers[J].International Journal of Heat transfer and Mass Transfer,2013,66(6):543-552. [17] ZHOU Fuguo,Lagrone J,Acharya S.Internal cooling in 4∶1 AR passages at high rotation numbers[J].Journal of Heat Transfer,2007,129(12):1666-1675. [18] Fu W L,Wright L M,Han J C.Rotational buoyancy effects on heat transfer in five different aspect-ratio rectangular channels with smooth walls and 45 degree ribbed walls[J].Journal of Heat Transfer,2006,128(11):1130-1141.
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