关键词: 低压涡轮;非定常流;尾流;转捩模型+;数值仿真

Abstract: The engineering design of high-lift or ultra-high-lift low-pressure turbines based on unsteady flow environments requires supports of proper numerical tools.Based on Langtry-Menter transition model,the interaction between wake and boundary layer on PAK-B profile was simulated by using commercial CFD code to solve the URANS equations,with inlet Reynolds number,free stream turbulence lever and the wake reduced frequency to be 2.5×104,2.5%,and 0.92,respectively.The physical mechanics disclosed by predicted results such as the transportation of wake,the development of roll up vortexes,and the transition induced by wake,showed a qualitative agreement with the open experimental descriptions.Additionally,the predicted results need further quantitative validation.

Key words: Low-pressure turbine;Unsteady flow;Wake;Transition model+;Numerical simulation