| 湍流相干结构对边界层中标量扩散的影响 |
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| 引用本文： | 王道增,樊靖郁. 湍流相干结构对边界层中标量扩散的影响[J]. 上海大学学报(自然科学版), 1997, 0(1) |
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| 作者姓名： | 王道增 樊靖郁 |
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| 作者单位： | 上海市应用数学和力学研究所 |
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| 摘 要： | 在大气边界层风洞和玻璃水槽中进行湍流边界层流动中的标量扩散模拟试验和机理研究．通过流动显示、湍流测量和频谱分析，已表明湍流边界层中的间歇现象在标量扩散过程中起着重要作用．烟雾在大气中的扩散、悬浮污染物质在河流中的扩散都属于湍流边界层中的标量扩散问题．在近源区，标量扩散主要受到各向异性湍流相干结构的影响，结果往往在近源区会出现局部的较高浓度的污染物质．采用流动显示和频谱分析相结合的研究方法，得到了在某些流动条件下的湍流相干结构时间和空间尺度近似值
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| 关 键 词： | 标量扩散；相干结构；湍流边界层 |
Influence of Turbulent Coherent Structure on Scalar Diffusion in Boundary Layer |
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| Wang Daozeng Fan Jinyu. Influence of Turbulent Coherent Structure on Scalar Diffusion in Boundary Layer[J]. Journal of Shanghai University(Natural Science), 1997, 0(1) |
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| Authors: | Wang Daozeng Fan Jinyu |
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| Abstract: | The simulation tests of scalar diffusion have been carried out in an atmosphere boundary layer wind tunnel and in an open tidal water flow channel, in which flow visualisation, turbulence measurement and frequency spectra analysis technology have been used. Through experimental research and theoretical analyses, it was verified that the turbulent intermittent phenomenon plays an important part in scalar diffusion, such as plume, soliquoid sediment in shear flow. In the near field, the diffusion of scalar is mainly affected by the non isotropic quasi periodic large scale coherent structure of turbulence so that the higher pollutant concentration may appear at those locations near a source. The rough values of time and space scale of turbulent coherent structure have been obtained by combining flow visualisation with turbulent frequency spectra analyses. |
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| Keywords: | scalar diffusion coherent structure turbulence boundary layer |
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