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为了探索自循环机匣处理对跨声速离心压气机影响,利用全三维数值模拟方法对应用自循环上游槽封闭机匣、自循环机匣处理和光滑壁面机匣结构三种情况下的跨声速离心叶轮进行了详细研究。对比结果表明:机匣处理抽吸槽结构本身对离心级的影响很小;自循环机匣处理使得在近失速区域离心级压比和效率有所增加。通过详细的流场分析表明:机匣处理可以降低叶片尖部负荷;自循环机匣处理通过引走叶轮通道内气流并回流到上游,可以延缓叶轮进口攻角的变化和激波的推进,从而延缓离心叶轮的失速。
In order to explore the influence of self-circulation casing treatment on transonic centrifugal compressor, the full three-dimensional numerical simulation method was used to analyze the transonic centrifugal force under the three cases of self-circulation upstream tank closed casing, self-circulation casing treatment and smooth wall casing structure Impeller carried out a detailed study. The results of comparison show that the structure of the sump of the casing treatment has little effect on the centrifugal stage and the centrifugal pressure ratio and efficiency in the near-stall area increase due to the self-circulation casing treatment. The detailed flow field analysis shows that the casing treatment can reduce the tip load of the blade. Since the casing of the circulation can remove the change of the angle of attack of the impeller entrance and the advance of the shock wave by removing the airflow in the impeller passage and returning to the upstream, Delays the stall of the centrifugal impeller.