小流量工况下叶尖弯曲对间隙流动影响的数值研究

为研究叶片叶尖弯曲对间隙流动的影响情况,采用数值模拟方法,研究了不同叶尖弯曲参数(弯曲方向、弯高、弯角)对跨声速压气机动叶在小流量工况条件下的间隙流动的影响,研究对象为美国国家航空航天局(National Aeronautics and Space Administration,NASA)Rotor37跨声速压气机转子叶排.结果表明:在小流量工况条件下,叶尖弯曲对平均效率的影响无明显规律,但可能导致平均效率下降;叶尖正弯曲能够改善间隙附近的流动情况,使叶片通道内的堵塞程度降低,降低间隙附近的流动损失;而叶尖反弯曲会使得叶片通道内的堵塞程度增加,增加间隙附近的流动损失.

Numerical Study on the Influence of Bowing of Rotor Blade' s Tip on the Tip Clearance Flow under Low Flow Rate Condition

The effect of different blade tip bowing parameters on the tip clearance flow of transonic compressor under low flow rate condition was numerically investigated by means of CFD simulation. Three main parameters were considered, including the direction of the bowing, the height of the bowing and the angle of the bowing. The rotor blade row of NASA Rotor37 transonic compressor was taken as the research object. The results show that the tip bowing has no significant effect on the average efficiency under the low flow rate condition, but may result in the decrease of the average efficiency. The positive bowing of the blade tip can enhance the quality of the flow around the tip clearance, and the reducement of the clogging between the channels and a lower flow loss were observed. On the contrary, the clogging between the channels and the loss around the tip clearance have a considerable increase while the tip bows in the opposite direction.