用于可压缩自由剪切流动的湍流混合长度

发布时间：2018-01-04 11:23

本文关键词：用于可压缩自由剪切流动的湍流混合长度　出处：《航空学报》2016年06期 　论文类型：期刊论文

【摘要】：抓住可压缩流动变密度特性,构造出基于有效涡量的三维von Karman混合长度。湍流模型采用仅依赖湍动能k的单方程KDO(Kinetic Dependent Only)模型,引入新构造的混合长度替换旧尺度得到CKDO模型。为了验证其描述可压缩自由剪切湍流的能力,选择无壁面束缚、密度梯度大和可压缩效应强的自由剪切混合层为算例,其对流马赫数Mac=0.8。计算结果表明,KDO模型对混合层的速度分布有着良好的控制和模拟,而经可压缩修正后的CKDO模型与原模型及其他可压缩修正模型相比,所计算的速度分布、主雷诺剪切力和混合层厚度与试验结果更加接近,说明了该混合长度对可压缩混合层这种自由剪切湍流有着良好的刻画能力。
[Abstract]:Grasp the variable density characteristic of compressible flow. Three dimensional von Karman mixing length based on effective vorticity is constructed. The Kinetic Dependent only model. The CKDO model is obtained by introducing the new mixing length to replace the old scale. In order to verify its ability to describe compressible free shear turbulence, no wall binding is chosen. The free shear mixed layer with large density gradient and strong compressible effect is taken as an example, and its convection Mach number is Mac0.8. The results show that the KDO model has a good control and simulation on the velocity distribution of the mixed layer. Compared with the original model and other compressible modified CKDO model, the calculated velocity distribution, the main Reynolds shear force and the thickness of the mixed layer are closer to the experimental results. It is shown that the mixing length has a good characterizing ability for compressible mixing layer free shear turbulence.
【作者单位】：北京航空航天大学能源与动力工程学院;西北工业大学航空学院;
【基金】：航空发动机气动热力国家科技重点实验室基金(9140C410505150C41002)~~
【分类号】：V211
【正文快照】： 网络出版地址:www.cnki.net/kcms/detail/11.1929.V.20151204.1008.002.html引用格式:徐晶磊,宋友富,张扬,等.用于可压缩自由剪切流动的湍流混合长度[J].航空学报,2016,37(6):1841-1850.XU J L,SONG Y F,ZHANG Y,et al.Turbulence mixing length for compressible free shear

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