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. The full three-dimensional numerical simulation of the low-pressure centrifugal compressor under low-Reynolds number conditions is carried out and the effect of Reynolds number on the internal flow field is analyzed. The results show that with the decrease of Reynolds number, the efficiency, The influence of the blade surface load distribution, making the rotor blade work capacity decreased; blade leading edge separation area increases, the secondary flow increases, the splitter blade tip leakage loss increases, the main blade suction surface channel low velocity zone significantly increased Large, starting position also move forward, the impact of the exhibition area also increases.