李宗恺. 1982. 考虑环境湍流作用的烟气上升路径方程[J]. 气象学报, 40(1):80-88, doi:10.11676/qxxb1982.008
考虑环境湍流作用的烟气上升路径方程
ON THE MEAN PATH OF RISING BUOYANT PLUMES IN CONSIDERATION OF AMBIENT TURBULENCE
投稿时间:1980-09-18  修订日期:1981-02-14
DOI:10.11676/qxxb1982.008
中文关键词:  
英文关键词:
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作者单位
李宗恺 南京大学气象系 
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中文摘要:
      本文利用我国的观测资料对中性层结时的烟气拾升路径作了细致的分析.发现抬升高度与距离之间符合幂次关系,但与不考虑环境湍流作用的"2"/3次律有系统偏离;这一偏离与烟流半径和高度的非线性关系相一致.上述事实与国外的一些观测结果均表明,环境湍流对烟气抬升的累积作用不容忽视.为此,提出了环境湍流与自生湍流的联合作用模式,由此导得的抬升路径方程可以满意地解释上述观测事实.模式还显示,卷挟速度除取决于切变速度及湍流强度以外,还是烟流半径的函数,因而在物理上更加合理.由联合作用模式导出的终极抬升公式比不考虑环境湍流累积作用的公式更符合观测结果.
英文摘要:
      In this paper, the path of rising buoyant plumes in neutral condition has. been analysed carefully on the basis of the data got from the observation in our country. It has been found that the plume rise height varies with distances. according to the power law, but there exist systematic departures from the 2/3 power law, which are cosistent with the non-linear relation between plume radius and plume heights. These facts as well as some results from the experiments abroad indicate that the accumulative effect of ambient turbulence on plume rise can not be neglected. Thus, a model including the joint effect of ambient and self-genarating turbulence is developed. A corresponding equation of mean path of buoyant plume has been deduced, and the observed facts can be explained satisfactorily. The model also shows that the entrainment velocity, in addition to depending on the shear velocity and the ambient turbulent intensity, is also the function of the effective plume radius. Thus it is more reasonable physically, and the plume rise formula deduced from the model is obviously better in agreement with those observation data than that without consideration of accumulative effect of the ambient turbulence.
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