叶片弯曲对气冷涡轮叶栅气动性能影响的数值研究

基于全三维N-S方程求解,采用具有Godunov性质的三阶精度TVD格式、分区算法以及自由型曲面技术,提供一种有效的方法来模拟气冷涡轮流场.在某型气冷涡轮叶片表面8个位置以及轮缘和轮毂进行喷气,并对采用直、弯叶片的涡轮流场进行了数值模拟.结果表明,叶片弯曲明显降低了有、无端壁喷气时的端部能量损失.在叶高中部喷气量较大时,弯叶片的气动性能下降较大.

Numerical Simulation of the Influence of Bowed Blade on the Performance of Turbine Cascade with Film-Cooling

Based on a 3D N-S solver,a computational method was adopted to simulate the flow field in film-cooling turbine,which included a finite difference scheme with 3rd order precision and TVD property,domain decomposition method and arbitrarily curved mesh technique.Air was ejected from 8 locations on the turbine blade surface and the upper and lower endwalls.Both the flow fields in the turbine cascade with straight and bowed blade were simulated.The results show that bowed blade apparently reduces the endwall losses whether with and without cooling.The aerodynamic performance of bowed blade becomes worse when the ejection flux is getting larger in the mid-span.