脉冲进气条件下可变喷嘴涡轮性能影响因素分析

张锐; 施新; 杨策; 马朝臣; 祁明旭

脉冲进气条件下可变喷嘴涡轮性能影响因素分析

北京理工大学机械与车辆学院, 北京100081

基金项目: 国家自然科学基金(51276018)

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出版历程
- 收稿日期: 2012-09-14
- 刊出日期: 2013-09-28

Analysis on variable nozzle turbine performance influenced by multiple factors under pulsating flow conditions

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为了改善涡轮和发动机的匹配,采用计算流体动力学(CFD)方法研究了脉冲进气条件下脉冲频率、脉冲振幅、喷嘴角度以及涡轮转速对可变喷嘴涡轮非定常性能的影响.研究结果表明:脉冲频率为80Hz时涡轮瞬态最低流量比40Hz时提高了10.4%,瞬态最低效率增加了4.7%,效率滞后现象更加明显;低脉冲振幅为25kPa时涡轮通流能力和效率迅速恢复,并且指出在低脉冲振幅时采用稳态设计是可行的;喷嘴角度为32°时,涡轮脉冲进气与稳态进气两种情况下的流量差异比喷嘴角度为10°时增加了3.3%,效率差异则增加了6.6%.涡轮内部脉动强烈,涡轮通流能力和效率下降明显;涡轮转速为47256r/min时脉冲进气造成的流量和效率变化分别比30000r/min时相应值高了2.9%和0.8%,高转速时涡轮内部流场易受到进口条件影响,涡轮流量、效率以及攻角与稳态情况偏离大.
- 脉冲进气 /
- 可变喷嘴涡轮 /
- 频率 /
- 振幅 /
- 非稳态
Abstract: To improve the matching between the turbine and engine,computational fluid dynamics(CFD) methods were adopted to investigate the unsteady performance of variable nozzle turbine influenced by pulsating flow frequency,pulsating flow amplitude,nozzle vane angle and turbine rotating speed.Results show that the turbine instantaneous minimum mass flow rate under 80Hz condition is 10.4% higher than that under 40Hz condition,and the lowest efficiency increases by 4.7%.At high pulsating frequency,the unsteady efficiency apparently lags behind velocity ratio.Under pulsating amplitude of 25kPa condition,the swallow capacity and efficiency recover rapidly,indicating that it is possible to design turbines by steady flow hypothesis under low amplitude conditon.For nozzle angle of 32 degree, the mass flow difference between pulsating inlet flow condition and steady inlet flow condition is 3.3% more than that of 10 degree, and the efficiency difference is 6.6% more.Higher nozzle angle makes turbine flow field more pulsative and results in mass flow rate and efficiency dropping significantly.Under turbine rotating speed of 47256r/min condition,the mass flow rate and efficiency variation caused by pulsating inlet flow is 2.9% and 0.8% more compared to that of 30000r/min.The turbine flow field is more sensitive to turbine inlet condition when rotating speed is high,and the mass flow rate,efficiency and attacking angle deviate from equivalent steady values.
- pulsating flow /
- variable nozzle turbine /
- frequency /
- amplitude /
- unsteady

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参考文献(15)

[1]	Baines N C.Fundamentals of turbocharging[M].[S.I.] :Concepts NREC,2005.
[2]	Yeo J H,Baines N C.Pulsating flow behaviour in a twinentry vaneless radial-inflow turbine[J].Institution of Mechanical Engineers(IMechE),1990,405(4):113-122.
[3]	Baines N C,Hajilouy-Benisi A.The pulse flow performance and modelling of radial inflow turbines[J].Institution of Mechanical Engineers(IMechE),1994,484(6):209-218.
[4]	Rajoo S,Martinez-Botas J.Unsteady effect in a nozzled turbocharger turbine[R].ASME Paper GT2007-28323,2007.
[5]	Abidat M.Predicition of the steady and non-steady flow performance of a highly loaded mixed flow turbine[J].Institution of Mechanical Engineers(IMechE),1998,212(3):173-184.
[6]	Palfreyman D,Martinez-Botas R F.The pulsating flow field in a mixed flow turbocharger turbine:an experimental and computational study[J].Trans of ASME,2005,127(1):144-155.
[7]	Costall A,Palfreyman D.Detailed study of pulsating flow performance in a mixed flow turbocharger turbine[R].ASME Paper GT2005-68828,2005.
[8]	Chen L,Zhuge W L.Investigation of flow structure in a turbocharger turbine under pulsating flow conditions[R].SAE Paper 2008-01-1691,2008.
[9]	葛宁.涡轮非定常流数值计算方法研究[J].航空动力学报,2009,24(5):1066-1070. GE Ning.Evaluation of a numerical calculation method for unsteady flow in turbomachinery[J].Journal of Aerospace Power,2009,24(5):1066-1070.(in Chinese)
[10]	孙大伟,乔渭阳.不同攻角对涡轮叶栅损失的影响[J].航空动力学报,2008,23(7):1232-1239. SUN Dawei,QIAO Weiyang.Influence of different incidences on loss in turbine cascade[J].Journal of Aerospace Power,2008,23(7):1232-1239.(in Chinese)
[11]	施新,马朝臣.JK90S可变喷嘴涡轮增压器试验研究[J].车用发动机,2005,160(6):56-58. SHI Xin,MA Chaochen.Experimental study on JK90S variable nozzle turbocharger[J].Vehicle Engine,2005,160(6):56-58.(in Chinese)
[12]	于立国.车用涡轮增压器涡轮在脉冲进气条件下的非稳态特性研究[D].北京:北京理工大学,2008. YU Liguo.Investigation on turbine non-steady characteristics of automotive turbocharger under pulse flow conditions[D].Beijing:Beijing Institute of Technology,2008.(in Chinese)
[13]	吕伟.车用增压器可调涡轮喷嘴特性的研究[D].北京:北京理工大学,2010 LV Wei.Characteristic investigation of vehicular turbocharger variable geometry turbine[D].Beijing:Beijing Institute of Technology,2010.(in Chinese)
[14]	林建生,谭旭光.燃气轮机与涡轮增压内燃机原理及应用[M].天津:天津大学出版社,2005.
[15]	杨策,施新.径流式叶轮机械理论及设计[M].北京:国防工业出版社,2004.