关键词: 对置式撞击流, 喷嘴, 速度, 压力, 数值模拟

Abstract: In order to discuss the characteristics of the flow field in the Multiple impinging stream reactor，the flow field of the two nozzles opposed imping stream reactor and four nozzles opposed imping stream reactor under the different conditions were simulated by Fluent software. The import velocities were set as 5 m/s、10 m/s、15 m/s、20 m/s and 25 m/s. The simulation results showed that the average of flow velocity and the fluctuation of pressure increased to 4.1 times and 16.2 times，and the velocity gradient and the average of amplitude of pressure increased to 5.0 times and 25.4 times when the import velocity increased from 5 m/s to 25 m/s. The comparison of the two reactors indicated that greater average of velocity gradient and higher average of volatility of pressure were generated in the four nozzles opposed imping stream reactor. Both values were 1.2 times of that in the two nozzles opposed imping stream reactor，indicating that both shear force field and pulsation were more powerful in the four nozzles opposed imping stream reactor，more favorable for turbulent mixing within the reactor.

Key words: opposed imping stream, nozzles, velocity, pressure, numerical simulation