离心式制冷压缩机无叶扩压器内部流动分析

An Analysis for Flow performance inside the Vaneless Diffuser of Centrifugal Refrigeration Comprossor

在分析无叶扩压器内部流动基础上,利用差分法对分段焓降损失和参数进行了计算。通过计算发现气流角α沿流道呈近似抛物线型变化,且在流道中截面处存在一个最小气流角α_(min)。这与通常假设α_3=α_4=Const规律是不同的。

On the basis of the analysis for flow performance inside the vaneless diffuser, this paper calculated the enthalpy drop loss and the flow performance parameters of difference sections making use of the calculus of differences. It was developed that the flow angle a value changes with approximate parabola law along the flow channel and there is the least flow angle α_(min) in the cross section of the flow channel. This result is different from the law suggested normally of α_3=α_4= const.