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为了探索缝隙射流对高负荷扩压叶栅气动性能与近壁流场结构的影响机制,实验研究了设计冲角下有/无缝隙结构的高负荷弯曲扩压叶栅近壁流场结构与出口气动损失分布规律,获得了叶片近壁压力场数据、流动图谱以及叶栅出口流动损失参数。结果表明,缝隙两端压差导致的从叶片压力面到吸力面的射流能够增加附面层高熵流体的能量,缝隙射流将局部积聚的低能流体及时引向主流,减小高熵流体在叶展中部或端区掺混撞击,抑制了栅后尾迹高熵流体的过度聚集,从而有效提高高负荷压气机叶栅气动性能。
In order to explore the influence mechanism of the gap jet on the aerodynamic performance and the structure of the near-wall flow field of the high-load diffuser cascade, the structure and the outlet of the near-wall flow field of the high-load curved diffuser cascade with / without gap structure were designed experimentally The distribution of aerodynamic losses was obtained and the pressure field near the blade wall, the flow pattern and the outlet flow loss parameters at the cascade were obtained. The results show that the jet pressure from the blade pressure surface to the suction surface can increase the energy of the high entropy fluid in the coating, which leads the locally accumulated low-energy fluid to the mainstream in time and reduces the enthalpy of the high entropy fluid in the leaf In the middle or end of the exhibition, the mixed impact can restrain the excessive accumulation of high entropy fluid in the wake behind the gate, so as to effectively improve the aerodynamic performance of high load compressor cascade.