多喷嘴撞击流混合器径向流场数值模拟研究

Numerical Simulation of Radial Flow Field in Multi-nozzle Impinging Stream Reactor

为优化撞击流混合器结构,采用Fluent软件,对不同初始速度下的水平三向撞击流混合器径向流场特性进行数值模拟研究,并与两喷嘴对置式混合器进行对比.研究表明:水平三向撞击流混合器径向速度呈双峰分布,峰值点关于撞击点对称,随着初始速度的增大,峰值点位置不发生改变;三喷嘴混合器径向湍动能和湍流耗散率均呈单峰分布,峰值点即为撞击点;在相同初始速度下,三喷嘴混合器湍动能和湍流耗散率最大值分别为两喷嘴混合器湍动能和湍流耗散率最大值的2.21和2.06倍;4种初始速度下,水平三向撞击流混合器撞击点附近15

In order to optimize the structure of the impinging stream reactor, we use Fluent software to carry out numerical simulation studies for the flow field characteristics of three nozzles impinging stream reactor in different initial speeds, and compare with two nozzles impinging stream reactor. The results show that the radial velocity of three nozzles impinging stream reactor shows the bimodal distribution, and the peak is symmetrical about the point of impact. With the increase of initial velocity, the positions of peak point are not changed. The turbulence kinetic energy and turbulent dissipation rate in radial direction of three nozzle impinging stream reactor show the unimodal distribution, the peak is the impact point. In the same initial speed, the biggest turbulence kinetic energy and turbulent dissipation rate of three nozzle impinging stream reactor is 2.21 and 2. 06 times compared with the biggest of two nozzles impinging stream reactor, respectively. In four different initial velocities, distance of the impact point of three nozzle impinging stream reactor within the scope of 15 ram,turbulent kinetic energy values of three nozzle reac- tor are greater than the biggest values of two nozzle reactor.