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为了研究子午流道有较大扩压情况下 ,环形叶栅内集中涡系发生、发展的流动过程 ,详细测量了由栅前至栅后 1 2个横截面上气动参数沿节距和叶高的分布。试验结果表明 :子午流道的较大扩压增厚了进口端壁附面层 ,因而加剧了鞍点分离并形成了高强度、大尺度马蹄涡压力侧与吸力侧分支。周围的大量低动量气体加强了两分支的组对效应 ,推迟了通道涡的形成与发展 ,通道涡的强度与尺度同样正比于流道的扩压度。在叶栅下游 ,由于径向正压梯度的影响 ,低能气体沿尾流区向轮毂输运 ,引起下通道涡的迅速消散与衰减。
In order to study the flow process of the vortex cascade in the annular cascade under the condition of large expansion of the meridian flow channel, the aerodynamic parameters along the pitch and height Distribution. The experimental results show that the larger divergence of the meridian flow channel thickens the inlet endwalls, which aggravates the saddle point separation and forms the high-strength and large-scale horseshoe vortex pressure side and suction side branch. A large amount of low-momentum gas around it enhances the group-pair effect of the two branches and delays the formation and development of channel vortices. The strength and scale of the channel vortex are also proportional to the degree of divergence of the flow channel. Downstream of the cascade, due to the radial positive pressure gradient, the low-energy gas is transported to the hub along the wake region, causing the rapid dissipation and attenuation of the vortex in the lower channel.