Astudy on concentration measurement of diffusion matter andconstruction of diffusion model by visualization of area of a meandering Plume.

本文研究了在小型风洞中安装主动式湍流发生器产生的类大气湍流中湍流颗粒的扩散特性。从大量的瞬时可视化图像中提取亮度值，并进行统计处理，估算湍流扩散，得到了湍流雷诺数对湍流场尺度的指示，即相对扩散和曲折扩散对总扩散的贡献。这些扩散参数与Lee&Stone的扩散模型符合较好

The characteristics of turbulent particle diffUsion were investigatedin atmospheric like turbulence generated by an active turbulence generator installed to inasmall wind tunnel. Turbulent diffusion was estimated by extracting the brightness valuefrom alarge number of instantaneous visualization image, and are statistical processing.Contribution of relative diffusion and meandering diffusion in total diffUsion is obtained forturbulent Reynolds number that index on scale of turbulent field. And those diffusionparameters were reasonable agreement with Lee&Stone's model