弯掠叶片气动性能的实验研究

与直叶片相比较 ,对一种具有前掠和正弯积迭线的独特的压气机叶片进行了实验研究。在不同位置采用五孔探针测量了两种叶栅的气动参数并在叶片表面做了墨迹流动显示。结果表明弯掠叶栅端部损失降低而叶展中部损失增加 ,但相应的端部扩压因子有所减小。此外该叶片吸力面上形成了有助于防止低能流体在角区积聚的反C型压力分布。弯掠叶栅改善了端壁角区内的流动并显著降低了叶栅总损失

Experimental Study on the Aerodynamic Performance of Swept-Curved Blade

Compared with a straight blade, a unique compressor blade integrated forward-swept and positive-curved stacking line is studied experimentally. Aerodynamic parameters of the two cascades are measured by a five-hole probe at different positions and ink trace flow visualization is conducted on blade surfaces. The result shows that the swept-curved cascade has lower endwall loss and higher midspan loss as compared with the straight cascade. However, lower loss is accompanied with lower diffusion factor. Opposite `C' shape static pressure distribution is established on the suction surface of the swept-curved blade, which is helpful for avoiding the accumulation of low energy fluid in the endwall corner region. Anyhow the studies support the conclusion that the swept-curved blade conduces to not only the reduction of overall loss but also the improvement of stable operation in the endwall corner region.