关键词: 撞击流反应器, 数值模拟, 平均速度, 速度梯度

Abstract: To optimize and improve the structure and layout of a vertical impinging stream reactor，the mixing performance can be strengthened，the flow fields with different spacing were simulated using the Fluent software. The spacing between the upper and lower draft tubes are set as 60 mm，80 mm，100 mm，120 mm. The reaction is preceded at the rotating speed of 5 r/s，15 r/s，25 r/s respectively. The computation result shows that at a similar rotating speed，when the spacing of draft tube is 80 mm，the average speed of velocity distribution over the characteristic impact surface of reactor can reach a maximum value，and the performance of mass transfer under this structure is the best. Under the same condition，the impinging spacing with D=60 mm can come up to a maximum root-mean-square deviation in the radial velocity distribution of impinging surface，which indicates that in this zone of structure there is a great velocity gradient which is facilitated to the turbulent mixing of shear in the reactor.

Key words: impinging stream reactor, numerical simulation, average speed, velocity gradient