喷气流与栅后流场掺混及干扰效应的探讨

Mixing process in symmetry trailing edge slot for a turbine blade

关键词:  涡轮叶栅  叶栅流  尾流干扰  湍流混合  数值仿真

Key words:  Turbine cascade  Cascade flow  Wake interaction  Turbulent mixing  Numerical simulation

摘要:

应用有效的冷气喷射模型 ,结合涡轮叶栅三维流场计算程序 ,对叶片尾缘对开缝喷气进行了数值模拟。从栅后速度场、总压场以及气流角分布的角度 ,研究了射流与主流的掺混及干扰过程 ,结果表明 :采用对开缝喷气的涡轮叶栅 ,在尾缘附近射流与尾迹的掺混占主导地位 ,经过一段距离后 ,尾迹与主流的掺混起主要作用 ,而且后缘对开缝喷气对尾迹的流动结构及漂移过程有一定的影响。

Abstract:

A numerical analysis coupled with an effective ejection model was performed to study the effect of ejection from the symmetry slot of trailing edge for a turbine blade The process of mixing and interference were investigated by the distribution of velocity, total pressure and outlet angle The calculation results show that the mixing between ejection and wake play an important role near the training edge By passing some distance downstream, the mixing is mainly observed between wake and main flow The flow structure inside wake and its floating process is affected in some extent by ejection from symmetry slot of trailing edge for a turbine blade