稳态雷暴冲击风风速剖面模型研究

摘要

Thunderstorm downburst is the main cause for formation of extreme wind loads in non-typhoon areas. Here,both the static impinging jet device and the large eddy simulation(LES)were used to do the physical experiment and numerical simulation for thunderstorm downburst.The distribution features of radial and vertical wind velocities were investigated.Aiming at that the existing radial wind velocity profile model was not applicable to the radial wind velocity distributions at all radial locations,combining the results of the experiment and LES,a new radial wind velocity profile model being suitable to all radial locations was proposed.Meanwhile,the wind flied was divided into three parts according to the characteristics of vertical wind velocity,the vertical wind velocity profile models were presented for all the three parts.%雷暴冲击风是非台风地区形成极值风荷载的主要原因。采用静止型冲击射流装置和大涡模拟分别对雷暴冲击风风场进行了物理试验和数值模拟，考察了径向风速和竖向风速的分布特征。将大涡模拟结果和试验结果与现有实测数据和理论模型进行了对比，验证了试验和数值模拟结果的可靠性。针对现有的径向风速模型并不适用于所有径向位置处径向风速的问题，结合物理实验和大涡模拟的结果，提出了沿径向变化的径向风速剖面模型。同时，根据风场竖向风速的特点将其沿径向位置分为三个区域，给出了三个区域竖向风速剖面模型。