基于气动雾化机理的喷嘴性能试验研究

Experimental Study on Nozzle Performance Based on Aerodynamic Atomization Mechanism

针对目前气动雾化喷嘴结构复杂、雾化液滴不均匀等问题,设计了气相通道斜度为30°,45°,60°的3种喷嘴,基于气动雾化机理,以自来水为试验工质,利用相位多普勒粒子测量仪检测了气液比、气相通道开口斜度及气相压力对雾滴粒径、喷雾宽度以及雾化沉积量的影响。结果表明:气液比相比于气相通道开口斜度、气相压力参数对雾滴粒径的影响明显;随着气液比的增大,雾滴粒径变小,雾化颗粒更加均匀;气液比对喷雾宽度的影响同样十分明显,随着气液比增加,雾化角变大,喷雾宽度增加,且喷雾宽度内的雾滴沉积量呈现正态分布。设计的气动雾化喷嘴可使雾化效果得到较大改善。

Pneumatic nebulization has many problems such as complicated structure of nozzle and droplets atomized uneven. Three kinds of gas channels with 30 degrees,45 degrees,60 degrees of nozzle were designed in this experiment,based on pneumatic atomization mechanism,and water was used as working fluid. The effect of gas-liquid ratio,gas channel opening angle,gas pressure on the particle size,spray width and deposition amount of nozzle＇ s atomization droplet were measured by phase Doppler particle instrument. The results show that,the effect of gas-liquid ratio on the droplet size is obvious compared to the flow and pressure parameters of the gas-liquid interface. With the increase of gas-liquid ratio,the droplet size becomes smaller,and the atomization particles are more uniform. The effect of gas-liquid ratio on spray width is also obvious. With the increase of gas-liquid ratio,the spray angle ratio and the spray width will increase subsequently,the droplet deposition in the spray width is normal distribution. The design of pneumatic spray nozzle atomizing effect is greatly improved.