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通过理论分析结合数值模拟,开展了针对微尺度离心叶轮间隙泄漏流动堵塞模型的研究.结合微尺度旋转机械低雷诺数和高马赫数的工作条件,建立了考虑可压缩性和黏性损失的间隙泄漏流动堵塞模型.通过数值模拟分析了微尺度间隙泄漏流动特征及黏性在其中的作用,判定黏性作用对间隙泄漏流动的驱动作用不可忽略,黏性作用与压差作用对间隙泄漏流动的驱动作用效果相当.同时,黏性作用还会导致间隙泄漏流动的初始堵塞增大.采用某微尺度离心叶轮对间隙泄漏流动堵塞模型进行了验证,从数值计算结果中提取气动堵塞结果并与模型预测结果进行对比,表明改进的间隙泄漏流动堵塞模型能更准确地对间隙泄漏流动堵塞进行评估,在微尺度条件下具备更好的适用性.
Through the theoretical analysis and numerical simulation, the study on the flow blockage model of micro-scale centrifugal impeller clearance leakage was carried out.Combining the working conditions of low Reynolds number and high Mach number of micro-scale rotary machinery, the gap considering the compressibility and viscous loss Leakage flow jamming model.A numerical simulation is conducted to analyze the characteristics of micro-scale gap leakage flow and the role of viscosity in it. It is concluded that the driving effect of viscous action on the leakage flow can not be neglected. The viscous effect and differential pressure effect on the leakage flow And the effect of driving is equivalent.At the same time, the viscous effect will lead to the increase of the initial blockage of clearance leakage flow.A micro-scale centrifugal impeller is used to verify the model of leakage flow blockage, the aerodynamic blockage results are extracted from the numerical results and compared with the model The results of the prediction show that the improved gap leakage flow jamming model can evaluate the gap leakage flow jamming more accurately and has better applicability under the micro-scale conditions.