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在不同粗糙表面上龙卷涡旋特性的实验室模拟实验研究 被引量:2
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作者 文字信贵 王允宽 《气象学报》 CSCD 北大核心 1989年第1期34-42,共9页
本工作是在日本京都大学,防灾研究所的龙卷模拟实验室,用流体动力学模似实验方法研究三种不同粗糙表面对龙卷涡旋的影响。实验中,用热线风速表及微型风向标,测定了五个不同高度上的水平风速和风向分布,揭示出在不同粗糙表面上,龙卷涡旋... 本工作是在日本京都大学,防灾研究所的龙卷模拟实验室,用流体动力学模似实验方法研究三种不同粗糙表面对龙卷涡旋的影响。实验中,用热线风速表及微型风向标,测定了五个不同高度上的水平风速和风向分布,揭示出在不同粗糙表面上,龙卷涡旋的风速和风向分布特征。通过不断改变模拟装置的涡旋比S,发现当S值超过某一数值后(S>1.5),在不同粗糙表面上,龙卷涡旋的涡核尺寸将趋于一致。实验结果可进一步解释自然界中的观测事实,并对某些理论研究提供实验依据。 展开更多
关键词 龙卷涡旋 粗糙表面 实验室 模拟
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A LABORATORY INVESTIGATION OF CHARACTERISTICS OF TORNADO-LIKE VORTICES OVER VARIOUS ROUGH SURFACES
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作者 文字信贵 王允宽 《Acta meteorologica Sinica》 SCIE 1989年第4期506-515,共10页
In this paper,the effects of surface roughness on tornado-like vortices are studied in the laboratory for simulating tornado vortex at the Disaster Prevention Research Institute,Kyoto University,Japan. In the experime... In this paper,the effects of surface roughness on tornado-like vortices are studied in the laboratory for simulating tornado vortex at the Disaster Prevention Research Institute,Kyoto University,Japan. In the experiments,the distribution of the horizontal wind speed and direction at five different heights were measured with a hot-wire anemometer and a mini-vane.The characteristics of wind speed and direc- tion distribution for the tornado vortex on the various rough surfaces were first revealed with the simulative method in laboratory.By changing the swirl ratio(S=tanθ/2a)of simulation device,it is found that,the size of tornado-like vortex core will become almost identical,as the swirl ratio S exceeds a certain value (S>1.5). The experimental results can be used not only to explain the observed facts in the atmosphere but also to provide the experimental bases for some theoretical studies. 展开更多
关键词 A LABORATORY INVESTIGATION OF CHARACTERISTICS OF TORNADO-LIKE VORTICES OVER VARIOUS ROUGH SURFACES
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