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为了探索自循环机匣处理扩稳机理,利用全三维数值模拟方法对应用机匣处理的LSCC(低速离心叶轮)进行了详细研究。结果表明:自循环机匣处理能有效的延迟失速的发生并在近失速区域略微提高压气机的效率以及总压比。该机匣处理能有效地减小叶顶载荷,从而降低泄漏流相对速度,抑制间隙泄漏涡在叶顶通道内的发展以减小低速气流在流道内的阻塞,提高转子通道的通流能力,从而达到扩大稳定工作范围的目的,综合稳定裕度改进量为12.57%。
In order to explore the self-circulatory casing treatment stability expansion mechanism, the LSCC (low speed centrifugal impeller) treated with the casing was studied in detail using the full three-dimensional numerical simulation method. The results show that the self-circulated casing treatment can effectively delay the occurrence of stall and improve the compressor efficiency and total pressure ratio slightly in the near-stall area. The casing treatment can effectively reduce the blade tip load, and thus reduce the relative velocity of the leakage flow, restrain the development of the clearance leakage vortex in the blade tip passage so as to reduce the blockage of the low-speed airflow in the flow passage and improve the passage capacity of the rotor passage, So as to achieve the purpose of expanding the scope of stable work. The improvement margin of comprehensive stability margin is 12.57%.