尺度自适应方法在跨声速涡轮中的应用研究

Research on Applications of Scale-Adaptive Simulation in Transonic Turbine

关键词:  尺度自适应模拟  卡门尺度  尾迹涡

Key words:  Scale-adaptive simulation  Von Karman length scale  Wake vortex

摘要:

高压涡轮流场中存在多尺度的涡系和波系结构，对涡轮部件的气动、传热以及结构强度都有重要的影响。为快速准确把握其流动机理，本文对Menter发展的尺度自适应CFD方法进行了改进，并将新方法分别应用于圆柱绕流以及VKI LS89跨声速涡轮叶栅等典型流动算例。结果表明改进后的尺度自适应模型具有出色的空间分辨率，模拟结果能与大涡模拟、实验数据基本吻合且计算成本约为文献中大涡模拟的2.5%。

Abstract:

There are multi-scale vortex systems and wave systems inside the high-pressure turbine flow, which have an important influence on the aerodynamics, heat transfer and structural strength of turbine components. In order to quickly and accurately grasp its flow mechanism, the scale-adaptive simulation (SAS) CFD model developed by Menter is further improved, and the modified technique is applied to typical cases such as flow past a circular cylinder and VKI LS89 transonic turbine cascade. It can be found that the modified SAS model has excellent spatial resolution. The simulation results are in good agreement with the large eddy simulation (LES) and experimental data, and the computational cost is about 2.5% of the large eddy simulation in the literature.