ORC向心透平静叶栅内二次流结构和损失分析
|
摘要
为了改进有机工质朗肯循环(ORC)向心透平静叶栅的气动性能,对ORC向心透平内有机工质流动进行三维黏性数值模拟,分析静叶栅上下端壁和通道内各种涡系的表现形式,给出了沿轴向和径向方向的总压力损失系数分布.结果表明:静叶栅内存在压力面与吸力面之间的横向流动,但通道涡并没有形成,通道涡并不是ORC向心透平静叶栅内二次流涡流形式中的重要涡系结构;主要总压损失沿流向方向集中在静叶栅后0.4流向位置,沿叶高方向集中在上下端壁,沿周向方向则聚集在吸力面附近.
To improve the aerodynamic performance of stator cascades in radial inflow turbines,three-dimensional viscous numerical simulation was carried out for the flow of organic working fluid in a radial inflow turbine.The forms of various vortices on lower and upper end walls and in the stator cascade passage were analyzed in detail.Meanwhile the distribution of total pressure loss coefficient along the axial and radial directions was presented.Results show that there exists a horizontal flow between the pressure surface and suction surface,but no passage vortex is formed,which is not an important vortex structure for secondary flow in stator cascades of ORC radial inflow turbines.The total pressure loss mainly appears in later 0.4 cascade passage in axial chord direction,near lower and upper end walls in blade height direction,close to the suction surface in circumferential direction.
To improve the aerodynamic performance of stator cascades in radial inflow turbines,three-dimensional viscous numerical simulation was carried out for the flow of organic working fluid in a radial inflow turbine.The forms of various vortices on lower and upper end walls and in the stator cascade passage were analyzed in detail.Meanwhile the distribution of total pressure loss coefficient along the axial and radial directions was presented.Results show that there exists a horizontal flow between the pressure surface and suction surface,but no passage vortex is formed,which is not an important vortex structure for secondary flow in stator cascades of ORC radial inflow turbines.The total pressure loss mainly appears in later 0.4 cascade passage in axial chord direction,near lower and upper end walls in blade height direction,close to the suction surface in circumferential direction.
引文
[1]李军,苏明.涡轮静叶栅二次流的数值模拟[J].热能动力工程,2008,23(1):16-20.LI Jun,SU Ming.A study of the numerical simulation of secondary flows in turbine stator cascades[J].Journal of Engineering for Thermal Energy and Power,2008,23(1):16-20.
[2]HERMANSON K S,THOLE K A.Effect of inlet conditions on endwall secondary flows[J].Journal of Propulsion and Power,2000,16(2):286-296.
[3]李相君,楚武利,张皓光.高负荷轴流压气机叶栅二次流动与损失关联性探讨[J].推进技术,2014,35(7):914-925.LI Xiangjun,CHU Wuli,ZHANG Haoguang.Investigation on relation between secondary flow and loss on a high loaded axial-flow compressor cascade[J].Journal of Propulsion Technology,2014,35(7):914-925.
[4]GAO Jie,ZHENG Qun.Comparative investigation of unsteady flow interactions in endwall regions of shrouded and unshrouded turbines[J].Computers&Fluids,2014,105:204-217.
[5]鄢景,杨自春.动力涡轮有冠及无冠动叶栅顶部二次流的数值分析[J].燃气轮机技术,2011,24(2):30-34.YAN Jing,YANG Zichun.Numerical analysis of tip secondary flow in rotor cascades with or without shroud in power turbine[J].Gas Turbine Technology,2011,24(2):30-34.
[6]NATKANIEC C K,KAMMEYER J,SEUME J R.Secondary flow structures and losses in a radial turbine nozzle[C]//ASME 2011 Turbo Expo:Turbine Technical Conference and Exposition.Vancouver,British Columbia,Canada:ASME,2011:977-987.
[7]MIYOSHI I,HIGUCHI S,KISHIBE T.Improving the performance of a high pressure gas turbine stage using a profiled endwall[C]//ASME Turbo Expo2013:Turbine Technical Conference and Exposition.San Antonio,Texas,USA:ASME,2013:194-200.
[8]马超,臧述升,黄名海.变几何涡轮动叶栅流场的PIV实验研究[J].动力工程学报,2014,34(6):458-462,481.MA Chao,ZANG Shusheng,HUANG Minghai.PIV flow field measurement for rotor blade cascade of a variable geometry turbine[J].Journal of Chinese Society of Power Engineering,2014,34(6):458-462,481.
[9]SCHULTE V,HODSON H P.Unsteady wake-induced boundary layer transition in high lift LP turbines[J].Journal of Turbomachinery,1998,120(1):28-35.
[10]翁史烈.燃气轮机[M].北京:机械工业出版社,1989.
[11]PUTRA M A,JOOS F.Investigation of secondary flow behavior in a radial turbine nozzle[J].Journal of Turbomachinery,2006,135(6):061003.
[12]王鹏,邹正平,綦蕾,等.流向涡与涡轮叶栅二次流相互作用研究[J].实验流体力学,2010,24(3):42-49.WANG Peng,ZOU Zhengping,QI Lei,et al.Study of interactions between stream-wise vortex and secondary vortices in turbine cascade[J].Journal of Experiments in Fluid Mechanics,2010,24(3):42-49.
[13]王仲奇,冯国泰,王松涛,等.透平叶片中的二次流旋涡结构的研究[J].工程热物理学报,2002,23(5):553-556.WANG Zhongqi,FENG Guotai,WANG Songtao,et al.Study on secondary flow vortex structures in turbine bladings[J].Journal of Engineering Thermophysics,2002,23(5):553-556.
[14]林奇燕,郑群,岳国强.叶栅二次流旋涡结构与损失分析[J].航空动力学报,2007,22(9):1518-1525.LIN Qiyan,ZHENG Qun,YUE Guoqiang.Analysis of secondary flow vortex structure and losses in turbine cascades[J].Journal of Aerospace Power,2007,22(9):1518-1525.
[2]HERMANSON K S,THOLE K A.Effect of inlet conditions on endwall secondary flows[J].Journal of Propulsion and Power,2000,16(2):286-296.
[3]李相君,楚武利,张皓光.高负荷轴流压气机叶栅二次流动与损失关联性探讨[J].推进技术,2014,35(7):914-925.LI Xiangjun,CHU Wuli,ZHANG Haoguang.Investigation on relation between secondary flow and loss on a high loaded axial-flow compressor cascade[J].Journal of Propulsion Technology,2014,35(7):914-925.
[4]GAO Jie,ZHENG Qun.Comparative investigation of unsteady flow interactions in endwall regions of shrouded and unshrouded turbines[J].Computers&Fluids,2014,105:204-217.
[5]鄢景,杨自春.动力涡轮有冠及无冠动叶栅顶部二次流的数值分析[J].燃气轮机技术,2011,24(2):30-34.YAN Jing,YANG Zichun.Numerical analysis of tip secondary flow in rotor cascades with or without shroud in power turbine[J].Gas Turbine Technology,2011,24(2):30-34.
[6]NATKANIEC C K,KAMMEYER J,SEUME J R.Secondary flow structures and losses in a radial turbine nozzle[C]//ASME 2011 Turbo Expo:Turbine Technical Conference and Exposition.Vancouver,British Columbia,Canada:ASME,2011:977-987.
[7]MIYOSHI I,HIGUCHI S,KISHIBE T.Improving the performance of a high pressure gas turbine stage using a profiled endwall[C]//ASME Turbo Expo2013:Turbine Technical Conference and Exposition.San Antonio,Texas,USA:ASME,2013:194-200.
[8]马超,臧述升,黄名海.变几何涡轮动叶栅流场的PIV实验研究[J].动力工程学报,2014,34(6):458-462,481.MA Chao,ZANG Shusheng,HUANG Minghai.PIV flow field measurement for rotor blade cascade of a variable geometry turbine[J].Journal of Chinese Society of Power Engineering,2014,34(6):458-462,481.
[9]SCHULTE V,HODSON H P.Unsteady wake-induced boundary layer transition in high lift LP turbines[J].Journal of Turbomachinery,1998,120(1):28-35.
[10]翁史烈.燃气轮机[M].北京:机械工业出版社,1989.
[11]PUTRA M A,JOOS F.Investigation of secondary flow behavior in a radial turbine nozzle[J].Journal of Turbomachinery,2006,135(6):061003.
[12]王鹏,邹正平,綦蕾,等.流向涡与涡轮叶栅二次流相互作用研究[J].实验流体力学,2010,24(3):42-49.WANG Peng,ZOU Zhengping,QI Lei,et al.Study of interactions between stream-wise vortex and secondary vortices in turbine cascade[J].Journal of Experiments in Fluid Mechanics,2010,24(3):42-49.
[13]王仲奇,冯国泰,王松涛,等.透平叶片中的二次流旋涡结构的研究[J].工程热物理学报,2002,23(5):553-556.WANG Zhongqi,FENG Guotai,WANG Songtao,et al.Study on secondary flow vortex structures in turbine bladings[J].Journal of Engineering Thermophysics,2002,23(5):553-556.
[14]林奇燕,郑群,岳国强.叶栅二次流旋涡结构与损失分析[J].航空动力学报,2007,22(9):1518-1525.LIN Qiyan,ZHENG Qun,YUE Guoqiang.Analysis of secondary flow vortex structure and losses in turbine cascades[J].Journal of Aerospace Power,2007,22(9):1518-1525.