应用y-(Re)θt转捩模型对T106C高升力、低压涡轮叶栅进行数值模拟.分析了该模型在不同雷诺数工况下对层流分离诱导转捩的模拟精度.γ-(Re)θt模型通过求解关于间歇因子和当地转捩雷诺数两个输运方程,给出转捩起始位置和转捩区长度等信息;并且对层流分离诱导转捩进行了特定修正.结果显示,中、高雷诺数工况转捩模型预测结果与实验值较为一致,而低雷诺数工况模型预测的分离区域明显小于实验结果.降低入口黏性比可以有效改善低雷诺数工况的预测结果,湍流强度对分离点位置及分离区域大小有很大影响.%T106C high-lift low pressure turbine cascade was numerically simulated using γ-(Re)θt,transition model,and the accuracy of the prediction was analyzed under variant Reynolds number conditions.Two transport equations,intermittency and local transition onset momentum-thickness Reynolds number,are solved to obtain the transition onset location and transition region length,and the special revision is conducted for laminar separation induced transition.It is shown that the calculated results are well agreed with the experimental results with the medium and high Reynolds conditions.However the length of separated region is underestimated under low Reynolds condition.The result can be mended by changing the inlet viscosity ratio,and the turbulence intensity plays an important role in the separation point location and the length of separated region.
展开▼
