弯曲叶片对压气机轮毂-角区失速的影响

Bowed Blade Effect on Hub-Corner Stall

为了数值模拟弯曲静子对某两级低速轴流压气机总体性能及轮毂-角区失速的影响,选取了第1级静子进行弯曲。弯曲静子积叠线为贝塞尔曲线-直线-贝塞尔曲线(Bezier-line-Bezier,BLB)形式,弯高为20%叶片高度,弯角为10,15,20,25和30°。结果表明,弯曲叶片能有效抑制小流量范围内的轮毂-角区失速,从而改善压气机的性能。过度的弯曲会带来较大的叶型损失,从而导致大流量工况下压气机效率有所下降。扩散因子不能作为判断轮毂-角区失速是否存在的主要依据。

A numerical simulation is performed to analyze the effect of first stage bowed stator with different bowed angles on the total performance and the hub-corner stall for a two-stage low speed axial compressor.Bezier-line-Bezier（BLB） curve is chosen as the stacking line.The bowed height of BLB is 20% of blade height and the bowed angles are 10,15,20,25 and 30°.The result shows that bowed blade can suppress the hub-corner stall at low flow rate,thus increaing the efficiency.Moreover,excessive bow can cause bigger profile loss,which decreases the efficiency at high flow rate.Diffusion factor based on the two-dimensional airfoil separation data cannot be used as the criterion to predict the hub-corner stall.