陈家宜. 1981. 环境湍流对烟云抬升的作用[J]. 气象学报, 39(1):59-69, doi:10.11676/qxxb1981.007
环境湍流对烟云抬升的作用
THE EFFECTS OF AMBIENT TURBULENCE ON BENT-OVER PLUME RISE
投稿时间:1979-04-27  修订日期:1980-02-20
DOI:10.11676/qxxb1981.007
中文关键词:  
英文关键词:
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作者单位
陈家宜 北京大学地球物理系 
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中文摘要:
      本文研究了中性层结环境中湍流对烟云抬升的连续作用。取外部湍流卷挟率正比于湍流特征速度并叠加于自身卷挟率,分析表明,即使在抬升的早期,环境湍流对弯曲烟云的路径有不可忽视的影响,并使烟云路径加速变平。电厂烟云的实测资料表明,平均抬升路径实际上不完全符合无湍流环境的三分之二规律,而与本文理论结果更为接近。本研究也发现,最大抬升高度及其出现的下风距离都是大气湍流度的灵敏函数。据此,我们分析了几个常用抬升公式的局限性,并推荐了一种反映大气湍流度的改型公式。
英文摘要:
      The effects of ambient turbulence on rise of bent-over plumes have been analysed by use of an entrainment model in which an inflow component is assumed proportional to the characteristic velocity of ambient turbulence. The analysis demonstrates that the ambient turbulence shows notable.influence upon rising path of plume even in the early stages of rise and the leveling-off map occur relatively quickly. Better correlation between observed and predicted rise has been obtained fox buoyant plumes relased into non-stratified atmosphere. It has been found that both the dimensionless distance where the plume path begins to level-off and the dimensionless rise are sensitive to turbulence intensity. The validation of some plume rise formulas has been made.
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