龙卷风涡旋场气流的动力学分析

Dynamics Analysis of Airflow in Tornado Vortex Field

通过对龙卷风涡旋建立的动力学模型,得到龙卷风涡旋的压差变化梯度场的规律,并计算出相应的压差变化梯度场的数学表达式。根据龙卷风涡流场的压差变化梯度场,对处于龙卷风涡流场中的物体的径向受力进行了理论分析,并提出相应的计算方法与数学表达式。同时,依据龙卷风涡流场的压差变化梯度场,计算得出涡旋气流承受的负压差随涡旋半径的变化规律,并依据龙卷风涡旋旋转气流在涡旋场产生压差的各向同性的特性,对龙卷风中沿轴向运动的气流及在龙卷风涡旋场的物体进行运动与受力分析,得到沿涡旋场轴向运动气流的速度表达式和物体在龙卷风涡旋轴向受力的计算公式。最后依据龙卷风涡旋场气流轴向运动的速度规律,对龙卷风涡旋场风眼产生的原因进行了分析与计算。

According to the dynamics model that is established based on tornadoes and other vortices,the law of the pressure difference change of the gradient field of tornadoes and other vortices is obtained,and the mathematical expression of the corresponding pressure difference change of the gradient field is calculated.With reference to the pressure difference change of the gradient field in the tornado vortex field,the radial force of the object in the tornado vortex field is theoretically analyzed,and the corresponding calculation method and mathematical expressions are put forward.In addition,based on the pressure difference change of the gradient field in the tornado vortex field,the law of change in the negative pressure difference borne by the vortex airflow with the change in vortex radius is calculated.Furthermore,combined with the isotropy of the pressure difference of tornado vortex rotating airflow in the vortex field,the motion and force of the tornado airflow along the axial direction and the object in the tornado vortex field are analyzed,and then,the expression of the velocity of the airflow along the axial direction of the vortex field and the calculation formula of the axial force of the object in the tornado vortex field are obtained.Finally,on the basis of the velocity law of the airflow along the axial direction of the tornado vortex field,analysis and calculation are performed to determine the causes for the wind eye of tornado vortex field.