Influence of different structural parameters on droplet size of atomizing nozzle
FENG Jingzhi1, ZHU Xingye1,2*, HUA Shan2, QIAN Zhao1, LIU Junping1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China;2. Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Hangzhou, Zhejiang 310022, China
Abstract：Aiming at solving the problems of high atomization pressure and small atomization range in the development of current atomization nozzles, a new atomization nozzle was designed, and its atomization characteristics were analyzed. A laser particle size tester was used to investigate the effects of pressure(0.15~0.30 MPa)and different apertures(0.3~0.9 mm)on the nozzle atomization cone angle, velocity field, and droplet size, to obtain the changed rules of flow characteristics of the flow field under different test conditions. It was found that under low pressure, the atomization cone angle is greatly affected by the nozzle outlet diameter, and the larger the outlet shrinkage angle, the better the atomization characteristics. The nozzle with a diameter of 0.9 mm can achieve a relatively wide range of operation when the ratio of nozzle cavity length to the hole is 1 and the outlet contraction angle is 75°. With the increase of working pressure, the maximum value of droplet velocity also increases significantly, but the pressure has little influence on the overall velocity distribution of the atomization flow field. The droplet diameter also increases with the increase of pressure, and the nozzle outlet diameter has a significant impact on the droplet diameter, but the larger the outlet diameter, the smaller the droplet velocity, and the smaller the atomization cone angle.
