| 龙卷风与旋衡风的动力学分析及其统一认识 |
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| 引用本文： | 武圆.龙卷风与旋衡风的动力学分析及其统一认识[J].气象与减灾研究,2014(3):35-41. |
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| 作者姓名： | 武圆 |
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| 作者单位： | 北京人文大学,北京,101300 |
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| 摘 要： | 通过对旋衡风的受力分析,验证旋衡风遵守的基本物理原理:即旋衡风旋转的气流具有的离心力与其所承受的气压梯度力平衡。提出了龙卷风与旋衡风的统一认识:即龙卷风是旋衡风超高速旋转的极端存在形式。依据旋衡风所遵守的基本原理对龙卷风(或旋衡风)建立物理模型,根据该模型对龙卷风的角速度、密度以及其旋转气流层半径进行了参数化描述。依据龙卷风的模型分析探索龙卷风的压强差梯度场,得到龙卷风中心到边缘距离的气压变化值与龙卷风半径及其旋转气流层的角速度、密度的关系,并提出相关计算的数学表达式,以及龙卷风具有的能量与龙卷风旋转气流层各参数的关系。龙卷风及旋衡风的旋转运动还受其本身角动量守恒的制约,并论证了龙卷风旋转气流层的密度与半径以及角速度的关系。
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| 关 键 词： | 龙卷风 旋衡风 梯度压强差 气压梯度力 离心力 旋转气流层 |
The Dynamic Analysis and the Unified Understanding of Tornado and Cyclostrophic Flow |
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| Wu Yuan.The Dynamic Analysis and the Unified Understanding of Tornado and Cyclostrophic Flow[J].Meteorology and Disaster Reduction Research,2014(3):35-41. |
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| Authors: | Wu Yuan |
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| Institution: | Wu Yuan (Beijing Humanities University, Beijing 101300, China) |
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| Abstract: | By means of the force of cyclostrophic wind analysis, the basic physical principle of cyclostrophic wind was verified, i.e. the centrifugal force from the spinning flow of cyclostrophic wind balances with its pressure gradient-force. A unified understanding of tornado and cyclostrophic flow was put forward, i.e. tornado is an extreme form of cyclostrophic flow with ultra -high speed rotation. And according to the cyclostrophic flow basic principle, the tornado（or cyclostrophic flow） physical model is established, according to this model, the angular velocity, density and the rotating airflow layer radius are parameterizedly described. Basing on the pressure difference of tornado gradient field from the model, the pressure difference from cyclone center to border, the radius of tornado and spin angular velocity of the air layer are calculated. According to the obtained data and their relationships, the mathematic expression of the related calculation is put forward. The rotary motion of tornadoes and cyclostrophic flow is also controlled by its conservation of angular momentum. Finally, the relationships between the tornado spinning air density and the angular velocity and rotating airflow layer radius are demonstrated. |
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| Keywords: | tornado cyclostrophic flow centrifugal force the gradient of pressure difference the laminar air flow |
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