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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >A numerical study of the U-turn bend in return channel systems for multistage centrifugal compressors
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A numerical study of the U-turn bend in return channel systems for multistage centrifugal compressors

机译：多级离心压缩机回油通道系统中U形弯头的数值研究

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摘要

A qualitative numerical study of the flow in the U-turn bend of return channel systems for multistage centrifugal compressors is presented. Calculations have been carried out using the flow analysis program FLUENT. The flow in the U-turn bend is highly three-dimensional and complex. The main cause for this is the circumferential variation of the velocity profile at the inlet of the bend. The circumferential variation of the velocity profile is an unavoidable result from the wake/jet flow at the exit of the impeller. In this article, first the effect of the wake/jet flow coming into the U-turn bend is studied. It is shown that the wake/jet flow develops to form the secondary flow in the U-turn bend. The secondary flow, with the high streamline curvature of the flow in the bend, makes the flow inside the bend highly complex. This complex flow is hard to predict with conventional turbulence models that have been developed on the basis of near homogeneity of flows. Comparing the present result with a study that successfully predicted the loss and flow behaviour in the bend, a discussion is presented on the turbulence and the turbulence models. Also, the loss mechanisms in the U-turn bend are discussed in detail.
机译：给出了多级离心压缩机回油通道系统掉头弯头中流动的定性数值研究。使用流量分析程序FLUENT进行了计算。掉头弯头中的流动高度三维且复杂。造成这种情况的主要原因是弯头入口处速度曲线的周向变化。速度曲线的周向变化是叶轮出口处的尾流/喷射流不可避免的结果。在本文中，首先研究尾流/射流进入掉头弯头的影响。结果表明，尾流/射流在U形转弯处发展形成二次流。二次流具有弯道中流线的高流线曲率，使得弯道内的流非常复杂。使用基于湍流几乎同质性开发的常规湍流模型很难预测这种复杂的流速。将当前结果与成功预测折弯处的损失和流动行为的研究进行比较，讨论了湍流和湍流模型。另外，详细讨论了掉头弯头中的损失机理。

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