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结合实验数据,采用数值模拟方法对某带无叶扩压器离心压气机的性能与稳定性进行了详细分析,比较了设计点与近失速点下无叶扩压器内部的流动特征.结果表明:在发生喘振瞬间,扩压器进口最先出现了压力崩溃;扩压器进口流动特别是轮盖侧流动是导致压气机失稳的重要因素,对扩压器进口逆叶轮旋转方向的轮盖侧喷蒸汽能够提高扩压器的稳定性.
Combined with the experimental data, the performance and stability of a centrifugal compressor with a vaneless diffuser were analyzed in detail by numerical simulation, and the flow characteristics of the vaneless diffuser under the design point and the stalling point were compared. : In the instantaneous surge occurs, the pressure diffuser first appeared pressure collapse; diffuser inlet flow, especially the flow of the cover side is an important factor leading to the instability of the compressor, the diffuser inlet impeller rotation direction of the wheel Cover side steam injection can improve the stability of the diffuser.