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本文介绍以附面层吹除技术控制大扩张角扩压器气流分离的试验研究.研究中确定了抑制扩压器分离所需的最小吹除气流流量,并详细测定了流场变化和扩压性能参数.研究结果表明:对于扩张半角为15°的直壁扩压器,采用附面层吹除措施时,当吹气量为总气量的4%条件下,可明显地改善扩压性能,并消除了扩压流动中的分离.静压恢复系数较未采用吹除的原型扩压器提高7%,总压恢复约增加2%、而出口畸变指数改善8%.
In this paper, the experimental research on controlling the diffusive flow of diffusers with large diffuse angle diffuser is studied in this paper.The flow rate of the minimum blow-off air flow required to suppress the diffuser separation is determined and the changes of the flow field and diffuser The results show that for straight-wall diffusers with a half angle of expansion of 15 °, the diffuser performance can be obviously improved when the blowing rate is 4% of the total gas volume Eliminating the separation in the diffuser flow, the hydrostatic recovery factor increased by 7% over the prototype diffuser without blowing off, with a total pressure recovery increase of 2%, while the exit distortion index improved by 8%.