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鼓筒篦齿是航空发动机风扇部分的重要封严结构,其密封性能极大地影响着航空发动机的整机性能。为了充分认识鼓式篦齿封严结构中齿腔内的压力分布,了解篦齿封严机理,该文采用数值方法对鼓筒篦齿封严流场进行了仿真分析,重点讨论了旋转速度和篦齿封严出口静压对鼓筒表面气动力的影响。仿真结果表明:1)沿着流动方向鼓筒表面静压总体上呈现先减小后增大的变化趋势;2)与旋转速度的变化相比,篦齿封严出口静压的变化对鼓筒表面静压的影响更为显著;3)旋转速度一定时,鼓筒表面静压随着篦齿封严出口静压的增大线性增大。
Drum labyrinth is an important seal structure of aero-engine fan, and its sealing performance greatly affects the aeroengine’s overall performance. In order to fully understand the pressure distribution in the tooth cavity of the drum type labyrinth seal structure and understand the sealing mechanism of the labyrinth tooth, the numerical simulation of the seal flow field of the drum labyrinth tooth was carried out. The rotation speed and Influence of static pressure at the exit of the labyrinth seal on the aerodynamic force of drum surface. The simulation results show that: 1) The static pressure on the surface of the drum decreases firstly and then increases along the flow direction; 2) Compared with the change of rotation speed, The influence of surface static pressure is more significant; 3) When the rotating speed is constant, the static pressure on drum surface increases linearly with the increase of static pressure at the exit of labyrinth seal.