烟囱热排烟对舰船甲板风下洗影响的大涡模拟

采用低速气流运动控制方程组和湍流大涡模拟方法，研究迎面来风条件下、烟囱热排烟对舰船甲板风下洗气流的影响，得到舰船飞行甲板上空下洗与航向、横向速度随时间的变化。较无热烟气排出，热排烟使飞行甲板上方的下洗速度时均值减小，其脉动幅度增加；飞行甲板上距离机库门相同的位置上，越靠近首尾对称面，热排烟对下洗速度的影响越大；越靠近舰尾区域，热排烟对飞行甲板风下洗速度的影响越小。

Large eddy simulation to the effect of smoke from power device to downwash of wind over flight deck of warship

The control equations of air flow with lower Mach number and the large eddy simulation method of turbu-lent flows are used to study the effect of the heat smoke from the power device on the downwash of the wind over deck of warship under the condition of the head-on wind. The variety process of three components of velocity of air motion with time is conducted at some positions in the upper space over the flight deck. To compare without the heat smoke the heat smoke depresses the time-averaged downwash speed and advance the pulse downwash speed at the position over the flight deck. At the positions over the flight deck with the same distance to the door of garage the more near to the bow-stern plane the effect of the heat smoke on the downwash flow is more distinct. The closer the position is to the stern the less the effect of the heat smoke on downwash is.