压力旋流雾化喷嘴雾化特性的研究

Numerical Simulation of Atomization Characteristicsof

针对喷雾降尘中运用最为广泛的压力旋流雾化喷嘴,采用Fluent软件进行数值模拟分析,研究不同条件下压力旋流雾化喷嘴流场特性的变化。结果表明:空气芯始终存在于压力旋流雾化喷嘴内部;喷嘴出口处的轴向速度在速度场中起决定性作用,且在工作压力为4~6 MPa时,速度增量开始趋缓;喷嘴的雾化锥角随压力变化不大,当喷嘴出口直径在1~2 mm之间时,雾化锥角随喷嘴直径的增大而增大,且当喷嘴出口直径为2 mm时雾化锥角达最大值;结合工程实际,宜选择直径为2 mm的压力旋流雾化喷嘴在4~6 MPa的工作压力下工作。

Having Fluent used to simulate and analyze the pressure swirl atomization nozzle which widely used in spray dust removal was implemented and the different working conditions'influence on the flow field characteristics of the pressure swirl atomization nozzle was studied.The results show that,the air core always exists in the pressure swirl atomization nozzle.The axial velocity at the nozzle outlet plays a decisive role in the velocity field,and the velocity increment starts to slow down when the working pressure is 4 MPa to 6 MPa.The atomization cone angle of the nozzle has little change with the pressure variation.When the nozzle outlet diameter stays at 1 mm to 2 mm,the atomization cone angle increases with the increase of the nozzle diameter,and the atomization cone angle reaches maximum when the nozzle outlet diameter is 2 mm.Combined with the engineering practice,the pressure swirl atomizing nozzle with the diameter of 2 mm should be selected to work under the working pressure of 4 MPa to 6 MPa.