Application of γ-Reθt transition model in investigation of flow characteristics in microchannel

谷萌; 李海旺; 程健

doi:10.13224/j.cnki.jasp.2018.12.004

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Application of γ-Reθt transition model in investigation of flow characteristics in microchannel

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- Application of γ-Reθt transition model in investigation of flow characteristics in microchannel
- Vol. 33, Issue 12, (2018)
- 作者机构：
  
  1. 北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室,北京,100191
  2. 中国航空发动机集团有限公司沈阳发动机研究所,沈阳,110015
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.2018.12.004
  CLC：
- Published：2018
- 稿件说明：
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谷萌, 李海旺, 程健. γ-Reθt转捩模型在微通道流动特性研究中的应用[J]. 航空动力学报, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.004

谷萌, 李海旺, 程健. Application of γ-Reθt transition model in investigation of flow characteristics in microchannel[J]. 2018, 33(12).
谷萌, 李海旺, 程健. γ-Reθt转捩模型在微通道流动特性研究中的应用[J]. 航空动力学报, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.004 DOI：

谷萌, 李海旺, 程健. Application of γ-Reθt transition model in investigation of flow characteristics in microchannel[J]. 2018, 33(12). DOI： 10.13224/j.cnki.jasp.2018.12.004.

摘要

应用ANSYS CFX对矩形微通道中的流动进行了数值研究。通过与实验数据的对比检验了层流模型、γ-Reθt转捩模型和剪切应力输运模型在微通道流动转捩模拟中的适用性，并在此基础上探究了微通道长径比以及截面宽高比对临界雷诺数的影响。结果表明：3种模型中，只有γ-Reθt转捩模型捕捉到了转捩的趋势，并较为准确地捕捉到了临界雷诺数。当微通道的长径比不小于200，进口段对整体流动特性产生的影响可以忽略。当微通道的当量直径和长径比一定，宽高比由1增加到5时，临界雷诺数呈逐渐增长趋势。

Abstract

Numerical investigation was conducted with ANSYS CFX to investigate the flow characteristics in a rectangular microchannel. The performance of laminar model

γ-Reθt transition model and shear stress transport model in microchannel transition simulation was examined by comparing the predicted results with the experimental data. Furthermore

the effects of length-to-diameter ratio and aspect ratio were also investigated. Results indicated that only the γ-Reθt model predicted the trend of transition and forecasted a critical Reynolds number close to the experimental result. Length-to-diameter ratio over 200 was suggested to eliminate the influence of the entrance effect. The critical Reynolds number increased when the aspect ratio varied from 1 to 5.

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