大小叶片直叶栅泄漏流动数值模拟分析

基于S-A湍流模型的全三维数值模拟方法,对带间隙的大小叶片和常规直叶栅亚音泄漏流动进行了计算与分析.结果表明:短弦长小叶片对大叶片吸力面负荷分布、泄漏量以及泄漏涡的产生位置的控制作用较弱;攻角增大后,大叶片泄漏发展到小叶片尖隙导致二次泄漏,恶化叶栅性能;当小叶片靠近吸力面时表现的更为强烈;存在壁面移动时,二次泄漏更容易发生,但间隙流动得到改善;由于攻角变化导致了大叶片泄漏与小叶片尖隙干扰位置变化,表现出不同的叶尖流动模式.

Numerical simulation analysis of leakage flow in compressor cascade with splitter

3D numerical simulation with S-A turbulence model was applied to the low subsonic leakage flow analysis of traditional compressor cascade and splitter compressor cascade with clearance.The result shows: short splitter has weak influence on the suction pressure distribution,leakage flux and the position leakage vortex rotated on the tip of principle blade.When the attack angle increased,the principle blade leakage flow would develop to the splitter clearance and result in second leakage,this would worsen the flow and performance on the cascade tip.When splitter is moved to principle blade suction,the second leakage becomes more intense.When the case is moving,the second leakage on the tip of splitter happens more easier,but the flow on the cascade tip is improved.With the change of attack angle,the position where principle blade leakage flow interacted with the splitter clearance is changed,this change results in various flow models on the tip of principle blade.