应用附面层理论对离心压气机叶轮气动性能的研究

Approach to Centrifugal Compressure Impeller Pneumatic Performance by the Boundary Layer Theory

本文在三元势流计算的基础上用附面层理论分析了工作轮内附面层的变化规律,并根据附面层能量损失和动量损失厚度的大小,计算了工作轮内的流动损失和壁面摩擦阻力。由此得出的工作轮效率和流动损失系数的变化规律,为我们定量评价工作轮性能的优劣,提供了依据。同时,按叶片成型规律考虑了附面层对流道的阻塞,并用射流—尾迹模型(简称JW模型)修正了流动分离后的流动计算。结合本文理论计算与试验研究的成果,我们得出了一些有益结论。

Based on the calculation of three-dimensional potential flow, the article analyzes the change patterns of the boundary layer inside the impeller by means of the boundary layer theory, and calculates the flow loss and friction drag at the wall according to the thicknesses of the energy and momentum loss. From this impeller efficiciency and these change patterns of flow loss coefficients, a basis can be provided to evaluate quantitatively the performances of impellers at the same time, the clog is considered, which is generated by the boundary layer in the flow path, in accordance with the blade modelled, and the flow calculation has been revised with the Jet-Wake model (abbreviation J-W model) when the flow is diverged. Combining the thecretieal calculation of the article with the testing research results, some valuable conclutions are reached.