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大扩张角扩压器流场分离将严重影响扩压器性能和出口流场分布的均匀性。研究采用涡控技术抑制扩压流场的分离,其涡控方案是在扩压壁面设计“涡穴”,在气流流动时产生旋涡,“涡穴”内的旋涡与扩压流场相互作用,改变了扩压流场中的速度分布,增加了附面层内的动量,从而抑制了分离的形成。研究了“涡穴”几何尺寸对抑制效果的影响。试验证明:在合适的“涡穴”设计下,“涡穴”旋涡具有明显的抑制分离的作用,并以流场参数的测定分析了涡控机理。
Large divergence angle diffuser flow field separation will seriously affect the diffuser performance and outlet flow field distribution uniformity. The vortex control technology is used to suppress the separation of diffusive flow field. The vortex control scheme is to design a “vortex hole” on the diffuser wall and generate a vortex when the airflow flows. The vortex in the “vortex cavity” interacts with the diffuser flow field, Changes the velocity distribution in the diffusive flow field, increases the momentum in the interface layer, and suppresses the formation of separation. The influence of vortex geometry on the inhibition effect was studied. The experimental results show that vortices with vortex cavities can obviously suppress the separation under the suitable “vortex cave” design, and the vortex control mechanism is analyzed with the determination of the flow field parameters.