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设计了低速轴流风扇叶型转角45°、扩压因子超过0.6的扩压叶栅,测量了在设计工况与±10°攻角范围内的叶栅气动性能,采用PIV技术获得了对应工况下的叶栅内部流动状态。结果表明:扩压因子超过0.6时,增加叶型几何转角不能继续增加气流实际转角,气流转角反而有下降的趋势,叶栅损失明显增加。叶栅内流动的测量结果显示,在非设计工况下,大转角高扩压度叶栅后半段的流体流动与叶栅分离,造成了叶栅尾迹区域明显增大,这是导致叶栅流动损失增加的主要原因。
The design of the low-speed axial fan blade angle 45 °, diffuser factor greater than 0.6 of the expansion cascade, measuring the design conditions and ± 10 ° angle of attack of the cascade aerodynamic performance obtained using the PIV corresponding technology The state of the flow inside the cascade. The results show that when the diffuser factor is over 0.6, the increase of the geometric angle of the airfoil can not continue to increase the actual rotation angle of the air stream, but the turning angle of the air flow tends to decrease, and the loss of the cascade increases obviously. The results of cascade flow measurements show that at non-designed conditions, the fluid flow in the second half of the cascade with a large angle and high degree of divergence separates from the cascade, causing a significant increase in the wake area of the cascade, The main reason for the increase in liquidity loss.