多级轴流压气机流场周向非均匀作用模型

本文研究轴流压气机流场周向非均匀性的动量输运和能量输运作用。作者发展了一个多级压气机的周向非均匀作用模型。模型的主要基础及初步的试验对比表明了模型的可靠性。模型的数值结果表明:周向非均匀的动量输运作用不显著,但其能量输运作用很强、具有与湍流作用相同的量级;周向非均匀的动量输运作用能否忽略不计以及周向非均匀能量输运作用与湍流作用的相对大小,都决定于压气机的几何结构、径向位置和运行工况等三个方面。 

A CIRCUMFERENTIAL NON-UNIFORM EFFECT MODEL FOR MULTISTAGE AXIAL-FLOW COMPRESSOR THROUGHFLOW

The effects of momentum and energy transportation caused by circumferential non uniformities of the flow in a multistage axial compressor are studied.A model has been developed to represent the circumferential non uniform stresses and heat flux.A preliminary comparison between experimental results and the model demonstrates that this model is feasible.This study comes to the conclusions that:1.The momentum transport effects of circumferential non uniformities are not distinct,but the energy transport effects of the non uniformities are quite strong and have the same order of magnitude as the turbulent diffusion;2.The relative importances of the turbulent diffusion and the non uniformities depend on compressor configuration,loadings and spanwise positions in the compressor;3.Compared with the effects of their main stream counterparts,the circumferential non uniform stresses can be sometimes neglected,according to the compressor loadings,configuration and the calculation tolerences as well.