文章以某高压比斜流压气机级为研究对象,开展三维定常数值模拟研究,初步获取了压气机级性能和流场结构,并与试验结果进行了对比.结果表明,计算总体性能与试验存在一定的差距,计算的流量-压比曲线比试验值向右和向上移动,流量-效率曲线比试验值向右和略微向上移动.对于斜流叶轮,两个叶片通道出口靠近机匣区域均存在低速流团,通道1中低速流团主要由附面层低能流团在哥氏力作用下堆积而成,通道2中的低速流团主要由叶尖间隙泄漏形成.对于文中计算斜流压气机,通道1中的低速流团对诱发流动失稳起主要作用.%Sections 1 and 2 brief our usual method of numerical exploration. Section 3 presents the simulation results of our exploration and their analysis; its core consists of two parts: the simulation results and their analysis.The simulation results are given in Table 1 and Figs. 3 through 16 but not including Fig. 7. The analysis of simulation results shows preliminarily that: (1) there are discrepancies between the simulation results and experimental data provided by others; (2) compared with the experimental data, the characteristic line of mass flow-pressure ratio moves up and toward the right side; (3) the characteristic line of mass flow-adiabatic efficiency moves up and towards the right side; (4) there are low-velocity stagnation zones near the shroud areas at the outlets of two blade passages of the mixed flow impeller under investigation in this paper; the stagnation zone of Blade Passage 1 is caused by the boundary layer displacement forced by the Coriolis force; the stagnation zone of Blade Passage 2 is caused by the blade tip leakage flow; (5) the stall of the high-pressure ratio mixed flow compressor is mainly caused by the stagnation zone in Blade Passage 1.
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