许焕斌,王思微. 1984. 关于声振动对球形降水粒子运动边界层和运动状态的影响[J]. 气象学报, 42(4):431-439, doi:10.11676/qxxb1984.051
关于声振动对球形降水粒子运动边界层和运动状态的影响
ON THE INFLUENCE OF ACOUSTIC VIBRATION ON THE REGIME OF AIR MOTION IN THE BOUNDARY LAYER OF SPHERICAL PRECIPITATION PARTICLE FALLING
投稿时间:1983-05-12  修订日期:1983-10-22
DOI:10.11676/qxxb1984.051
中文关键词:  
英文关键词:
基金项目:
作者单位
许焕斌 国家气象局气象科学研究院 
王思微 国家气象局气象科学研究院 
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中文摘要:
      运动边界层内的运动状态强烈地影响着边界层分离点的位置,也影响着运动物体所受的阻力。我们认为,当运动边界层的特征厚度与声振动的振幅大小可以比拟时,声振动能引起边界层内各分层间动量交换,这样一来,边界层底层被加速了,分离点将被推后。根据这样一个效应,可以期望声振动能够减少下落着的球状降水粒子所受的阻力。我们把这种现象称为“润滑效应”。我们还利用提供的边界层计算方法,加上声振作用项,计算了这种效应所产生的影响,得出了有启示性的物理图象。
英文摘要:
      Air motion in the boundary layer (BL) greatly influences the locality of separation point behind which the BL separating the surface of sphere begins and obviously influences the drag of sphere in airflow. It was supposed that acoustic vibration may cause exchange of momentum between the different levels inside BL so that the airflow in the bottom of BL will be accelerated and the separation point will be pushed backwards when the characteristic wthickness of BL is comparable with the amplitude of acoustic vibrations. On the basis of this effects we can expect that the acoustic vibration will decrease ahe drag force exerted on a falling spherical drop. This effect may be called "lubrication". We have calculated this effect by means of the method given by лойуяский and gained an enlightening physical picture.
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