压力旋流喷嘴雾化特性数值模拟

为了改善生产作业环境,针对喷雾降尘作业运用最为广泛的1.5 mm孔径压力旋流喷嘴进行模拟仿真以研究雾化压力对雾化效果的影响。研究表明:在压力旋流喷嘴的雾化场中,沿喷嘴轴线方向,随着轴向距离的增大雾滴粒径不断增大、雾滴速度逐渐减小;在距喷嘴一定距离的横截面上,雾滴径向速度由中心向边缘先增大后减小,雾滴粒径随着径向距离的增大而增大,但增幅较小;同一孔径的喷嘴,随着喷雾压力的增加,雾滴轴向速度、径向速度均不断增加,速度衰减速率也增大;雾滴粒径随着喷雾压力的增大而减小,当喷雾压力达到一定数值时,继续增大喷雾压力,雾滴粒径减小幅度较小。

Atomization Properties Numerical Simulation of Pressure Swirl Nozzle

In order to improve the work environment, a simulation was conducted to study the effect of atomization pressure on the atomization effect by using the most widely used 1.5mm aperture pressure swirl nozzle. The research shows that, in the atomization field of the pressure swirl nozzle, along the direction of the nozzle axis, the particle size of the fog droplets increases and the droplet velocity decreases gradually with the increase of axial distance. In the cross section of a certain distance from the nozzle, the radial velocity of the droplet increases firstly and then decreases from the center to the edge, and the particle diameter increases with the increase of radial distance, but the increase is smaller. With the nozzle of the same aperture, with the increase of spray pressure, the axial velocity and radial velocity of the fog drop increase gradually, and the velocity attenuation rate also increases. The droplet size decreases with the increase of spray pressure. When the spray pressure reaches a certain value, the droplet size decreases slightly with the increase of spray pressure.