低雷诺数下离心压气机性能及流动影响的数值研究

对高空低雷诺数条件下低压离心压气机进行了全三维数值模拟,分析了雷诺数对其内部流场的影响,结果表明:随着雷诺数降低,离心压气机的效率、裕度和流通能力下降；影响叶片表面负荷分布,使得转子叶片的做功能力下降；叶片前缘分离区范围增大,二次流增强,分流叶片叶尖泄漏损失增大,主叶片吸力面通道的低速区明显增大,起始位置也向前移动,对展向的影响区域也随之增加.

Numerical analysis of centrifugal compressor performance and flow at low Reynolds number

Three-dimensional numerical simulation was conducted for a low pressure centrifugal compressor at low Reynolds number.Influence of Reynolds number on the flow-field was analyzed.The results show that, the efficiency,rotating stall margin and flow capacity reduce with the decrease of Reynolds number.Change of the blade loading distribution reduces the working capability of the compressor.In the flow-field,the leading-edge separation is more obvious and the secondary flow is encouraged.Tip leakage losses of the splitter blade increases.The low velocity flow area near the suction surface of blade obviously increases and its beginning location also moves forward.These will also enhance the influence on the span-wise region.