雷诺数对槽道平面叶栅气动性能影响的数值研究

Numerical Study of the Influence of Reynolds Number on Aerodynamic Performance of Slot Compressor Cascade

为了提高叶栅的气动性能,通过研究叶栅流场的流动结构改变几何参数以达到对叶栅进行流动控制的目的。该研究在原有干净叶栅的尾缘附近从下翼面到上翼面之间开了一个通槽,利用CFD商用软件数值模拟了干净叶栅和开槽叶栅在不同雷诺数下的气动性能,分析了雷诺数对二者气动性能的影响以及流场结构。研究表明:在低雷诺数下,这种槽道结构能够提高叶栅的总压损失系数同时适当的增大气流转折角;随着雷诺数的继续增加,在高雷诺数下槽道结构对叶栅的气动性能提高有限。

In order to improve the aerodynamic performance of compressor cascade, the flow structure of the compressor cascade flow field is studied and the geometric parameters are changed to achieve the purpose of flow control of compressor cascade. A slot is opened between the lower wing surface and the upper wing surface near the trailing edge in the original clean compressor cascade. CFD commercial soft- ware is used to simulate aerodynamic performance of the clean compressor cascade and slotted compres- sor cascade at different Reynolds number. The influence of aerodynamic performance and flow field struc- ture at different Reynolds number are analyzed. The research shows that the slot structure of the com- pressor cascade can increase the total pressure loss coefficient of the compressor cascade and increase the airflow angle under low Reynolds number. However, as the Reynolds number continues to increase, the slot structure of the compressor cascade will have a limited increase in the aerodynamic performance of the compressor cascade at high Reynolds number.