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本文分析了离心式压缩机无叶扩压器内流扬的特征,并建立了其内部流动的数学物理模型.认为沿无叶扩压器流道中分面具有非对称的粘性流动性质.在非径向流动时,其两侧壁上的边界层产生扭曲,并有一个从进口起始段到下游充分发展段的变化过程.文中着重对无叶扩压器的流动损失规律作了一些探讨,采用了内层变量表示的速度壁面律,以便计及边界层内部温度和径向压力梯度对速度分布和壁面摩擦系数的影响,从而提供了一种预测无叶扩压器性能的新方法.经不同进口条件下的实验验证,证明本文提出的性能预测方法是可行的,可以应用于粘性可压缩非对称流,也可以求解径向流和沿无叶扩压器中分面对称的流动.
In this paper, the characteristics of the flow in a non-leaf diffuser of a centrifugal compressor are analyzed and a mathematical and physical model of its internal flow is established. It is considered that the non-leaf diffuser flow channels have asymmetric viscous flow characteristics. Radial flow, the boundary layer on both sides of the wall distorts, and there is a change from the beginning of the inlet section to the fully developed section of the downstream.This paper focuses on the law of flow loss of the vaneless diffuser, The velocity wall law expressed by the inner variables is used to account for the influence of boundary temperature and radial pressure gradients on the velocity distribution and wall friction coefficient, thus providing a new method for predicting the performance of the leafless diffuser. The experimental verification under different inlet conditions proves that the performance prediction method proposed in this paper is feasible and can be applied to viscous compressible asymmetric flow. It can also solve radial flow and face-symmetric flow along non-leaf diffuser.