超大空间空气流动的数值分析

Numerical Analysis of Air Flow in Oversize Space

利用计算流体力学专业软件umoni 2.0对超大空间的空气流动过程进行数值模拟,分析了速度场、温度场和压力场分布规律以及送风温度和送风速度对超大空间空气流动的影响。研究发现,超大空间进风口压力为负压,并以辐射状向周围负压递增,中间区域达到最大负压,在底部中间处出现正压。进风口温度最低,并沿着射流方向递增。墙壁及超大空间底部温度明显低于中部及顶部温度,但高于进风口温度,中部和顶部温度变化不明显。进风口速度明显大于其他区域速度,且沿射流方向递减,中部回流区有两个较大的涡流。当送风速度变大或送风温度减小时,底部温度可达较低温度,制冷效果明显;而送风温度与送风速度变化对超大空间的压力分布几乎没有影响。

This article used professional software umoni 2.0 to have the numerical simulation of air distribution in oversize space and analyze the velocity field,thermal field,distribution rules of pressure field and the inlet air temperature and air velocity on oversize space air flows.The research shows that the inlet pressure at oversize space is negative pressure,which increases progressively in radial,reaches at its ultimate at the middle region and turns to be positive pressure at the middle of the bottom.The inlet temperature is lowest and increases along the direction of the jet flow.The temperature in both the wall and the bottom of the oversize space is distinctly lower than that of both middle and top,but higher than that in inlet;besides,there is no obvious change in temperature in middle and top.The speed of inlet,which decreases progressively along the jet direction,is obviously faster than that of any other regions;furthermore,there are two comparably vortex.Temperature can reach to lower and cooling effect would be distinct when the speed of blow-in becomes faster or the temperature of blow-in becomes slower;besides,neither the change of inlet temperature nor inlet speed has any effect on the distribution of oversize pressure.