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针对带楔形扩压器的高负荷离心压气机,利用数值模拟手段对其进行了研究,计算获得的离心压气机特性与试验结果符合较好。在此基础上,设计了具有不同喉部长度和扩张角的管式扩压器,利用经过校核的数值模拟手段对管式扩压器的喉部长度和扩张角进行了参数化研究。研究发现较长的喉部会使压气机设计点的性能下降,但是却可以抑制近失速点扩压器内的流动分离,喉部长度与喉部直径之比为0.5时综合性能较优;较大的扩张角会造成扩压器内流动分离,增加流动损失,扩张角由4°增加到12°时压气机效率降低了约3%。
Aiming at the high-load centrifugal compressor with wedge-shaped diffuser, the numerical simulation method is used to study the centrifugal compressor. The calculated centrifugal compressor characteristics are in good agreement with the experimental results. On this basis, the tube diffuser with different throat length and divergence angle was designed, and the laryngeal length and divergence angle of the tube diffuser were parameterized using the verified numerical simulation. The results show that the longer throat can reduce the performance of the compressor design point, but it can restrain the flow separation in the near-stall point diffuser. The ratio of throat length to throat diameter is better when the ratio is 0.5. The expansion angle will cause the flow separation in the diffuser, increasing the flow loss. When the expansion angle is increased from 4 ° to 12 °, the compressor efficiency is reduced by about 3%.