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CFD analysis of performance characteristics of Y-shaped diffuser with combined horizontal and vertical offsets

机译：具有水平和垂直偏移组合的Y形扩散器性能特征的CFD分析

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摘要

This paper presents the effect of combined horizontal (90°/90° turn) and vertical offsets (inlet and outlet in two different horizontal planes) on Y-shaped diffuser with rectangular inlet (AS = 2) and circular outlet with area ratio 2 with downstream settling length 1.5D at Reynolds number 2.74 × 10~5. A computer program based on finite volume technique, using standard k-ε turbulence model, has been adopted and modified to predict the flow. The results obtained from this study indicate reduced outlet pressure recovery accompanied with increase in non-uniformity in flow at the exit contributed by the offset effect. The comparison of pressure recovery with high vertical offset value of 1.25D with zero vertical offset indicates that there is significant drop of pressure of the order of 5%. Non-uniformity in flow at the outlet also increases from 5 to 9% from zero to 1.25D vertical offset due to offset effect. This paper also shows that increase in Reynolds number has marginal effect on the outlet pressure recovery for all cases of offset. The Y-shaped diffusers analyzed in the present study fulfill most of the requirements of the flow diffusion process efficiently and effectively.
机译：本文介绍了Y形散流器的水平进口（AS = 2）和圆形出口（面积比为2）的水平（90°/ 90°转弯）和垂直偏移（两个不同水平面的入口和出口）组合的影响。雷诺数为2.74×10〜5时，下游沉降长度为1.5D。采用了基于有限体积技术的计算机程序，该程序使用标准k-ε湍流模型，并对其进行了修改以预测流量。从这项研究中获得的结果表明，由于补偿效应，出口压力恢复降低，出口处的流量不均匀性增加。高垂直偏移值为1.25D且垂直偏移为零的压力恢复比较表明压力显着下降了5％左右。由于偏移效应，出口处的流量不均匀性也从5％垂直偏移增加到1.25D，从5％增加到9％。本文还表明，在所有补偿情况下，雷诺数的增加对出口压力的恢复都具有边际影响。在本研究中分析的Y形扩散器可以有效地满足流动扩散过程的大多数要求。

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