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采用数值模拟的方法对比带/不带自循环机匣处理结构对某型离心压气机性能的影响进行研究。结果表明,自循环机匣处理结构基本不影响设计点压气机效率,可以增加压气机堵塞状态的流量,减小失速状态的流量。同时,文章展示了带/不带自循环机匣处理结构时压气机内部的流场情况,从流场流动的角度分析了自循环机匣结构引起压气机特性变化的原因。带机匣处理结构的压气机,在设计状态下,气流攻角不变,压气机效率基本不变;失速状态下,气流攻角改善,流动更加稳定;堵塞状态下,气流由机匣处理结构流入叶轮喉部下游,增加了叶轮排气流量,拓宽了堵塞流量。
The numerical simulation method is used to compare the performance of a centrifugal compressor with or without self-circulating casing. The results show that the self-circulatory casing treatment structure basically does not affect the compressor efficiency at the design point, which can increase the flow of compressor clogging and reduce the flow of stalling state. At the same time, the article shows the flow field inside the compressor when the structure is treated with / without a self-circulation receiver, and analyzes the causes of the change of compressor characteristics caused by the self-circulation receiver’s structure from the perspective of the flow field. Under the condition of design, the air-flow attack angle is constant and the compressor efficiency is basically unchanged; under the condition of stall, the air-flow angle of attack is improved and the flow is more stable; in the plugged state, the airflow is controlled by the casing processing structure The flow into the downstream of the throat of the impeller increases the exhaust flow of the impeller and broadens the blocked flow.