自由流湍流度对某低压涡轮级气动影响的数值研究
Numerically investigate the effects of freestream turbulence on dynamics of a low-pressure turbine stage
-
摘要: 基于Langtry-Menter转捩模型,定常求解雷诺平均的三维粘性N-S方程组,数值研究了不同雷诺数工况下,自由流湍流度(FST)变化对某低压涡轮级流场及性能的影响,揭示了FST对该低压涡轮级叶片吸力面表面流动及涡轮级效率雷诺数效应的影响规律;并基于一种损失分离方法,细分了FST对该低压涡轮级内部各损失分量,如叶型损失、端壁边界层损失,叶尖泄漏损失的影响.Abstract: Based on SSTturbulence model coupled with Langtry-Menter transition model,a three-dimensional,vicous,steady CFDanalysis was performed for investigating the effects of freestream turbulence on the dynamics of a LPturbine stage at different Reynolds numbers.From the CFDprediction results,the rules of freestream turbulence effects on the flow mechanics on blade suction surface,and on Reynolds number effects on this LPturbine stage efficiency were obtained.Also,based on a kind of loss separation method,freesteam turbulence effects on the flow loss components,such as the profile loss,the endwall boundary loss,and the tip clearance loss inside this LPturbine stage were further distinguished.
-
[1] 罗华玲,乔渭阳,许开富.基于转捩模型的涡轮流场及性能数值模拟[J].西北工业大学学报,2007,25(6);778-783.LUO Hualing,QIAO Weiyang,XU Kaifu.Calculating reynolds number effects on the dynamic performance of turbine based on transition model[J].Journal of Northwestern Polytechnical University,2007,25 (6):778-783.(in Chinese) [2] Mayle R E.The role of laminar-turbulent transition in gas turbine engines[R].ASME Paper No.GT-1991-261,1991. [3] Matsunuma T,Abe H.Influence of turbulence intensity on annular turbine stator aerodynamics at low reynolds number[R].ASME Paper No.GT-1999-1510 1999. [4] Stieger R D,Hodson H P.The unsteady development of a turbulent wake through a downstream low-pressure turbine blade passage[R].ASME Paper No.GT-2004-53061,2004. [5] Langtry R B,Menter F R.A correlation-based transition model using local variables Part Ⅱ -Test cases and industry applications[R].ASME Paper No.GT-2004-53454,2004. [6] Menter F R,Langtry R B.A correlation-based transition model using local variables Part Ⅰ-Model formulation[R].ASME Paper No.GT-2004-53452,2004.
点击查看大图
计量
- 文章访问数: 1335
- HTML浏览量: 2
- PDF量: 454
- 被引次数: 0