【摘要】 利用物理模拟器生成下击暴流风场，研究了射流倾角对风速、气压等下击暴流风场特性的影响。结果表明：下击暴流风场同时具有水平风和竖向风，当存在射流倾角时，下击暴流风场对称性消失，下击暴流背侧竖向风速峰值大于前侧，且背侧竖向风速随倾角的增加而增大，射流倾角达到20°时，背侧竖向风速峰值比无倾角时增加67%;前侧水平风速峰值大于背侧，且前侧水平风速随倾角的增加而增加，射流倾角达到20°时，前侧水平风速最大比无倾角时增加50%,背侧水平风速则快速减小。随射流倾角的增加，出流下方区域正压值增加，其余位置受倾角的影响不大。更多还原

【Abstract】 The downburst wind field was generated by physical simulator, and the effects of jet tilt on the characteristics of downburst including the wind speeds and pressure were studied. The results show that the downburst wind field has both horizontal and vertical wind. When the jet tilt exists, the downburst wind field no longer presents symmetry. The peak value of vertical wind velocity on the rear side of the jet outflow is greater than that on the forward side, and the vertical wind velocity on the rear side increases with the increase of angle of jet tilt. When the angle of jet tilt reaches 20°, the vertical wind velocity on the rear side increases by 67% compared with that without jet tilt. The peak value of horizontal wind velocity on the forward side is greater than that on the rear side, and the horizontal wind velocity on the forward side increases slightly with the increase of the angle of jet tilt. When the angle of jet tilt reaches 20°, the horizontal wind velocity on the forward side increases by 50% at most compared with that without jet tilt, and the peak value of the rear side decreases rapidly. The pressure in the area below the outflow increases with the jet tilt, and the other positions are not affected by the jet tilt.更多还原