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-Re_(θt)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-Re_(θt)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。
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 theγ-Reθtmodel 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.
作者
谷萌
李海旺
程健
GU Meng;LI Haiwang;CHENG Jian(National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,School of Energy and Power Engineering, Beijing University of Aeronautics Astronautics,Beijing 100191,China;Shenyang Engine Research Institute, Aero Engine Corporation of China,Shenyang 110015,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2018年第12期2845-2850,共6页
Journal of Aerospace Power
基金
国家自然科学基金(51506002)
关键词
微通道
转捩
γ-Reθt转捩模型
长径比
宽高比
microchannel
transition
γ-Reθt transition model length-to-diameter ratio
aspect ratio
