自激振荡喷嘴的设计及其雾化性能实验研究

Design of Self-excited Oscillation Nozzle and Experimental Researches on Its Atomization Performance

为了更好地解决呼吸性粉尘问题,根据雾化粒度越小越有利于捕集呼吸性粉尘这一研究经验,研制了自激振荡喷嘴。与常规内混式空气雾化喷嘴不同,该喷嘴设计了自激振荡挡板装置,通过增加雾滴破碎次数来达到进一步加强雾化效果的目的。采用马尔文激光雾粒测试系统,对自激振荡喷嘴的雾化性能进行实验研究,确定自激振荡挡板的最佳匹配方案为在距喷射孔7 mm处安置直径为2 mm的挡板。实验表明:相比常规内混式空气雾化喷嘴,自激振荡喷嘴的有效射程不变,雾化液滴的平均粒径降低了1/3,测得平均粒径DV50为13.85μm,而且雾化液滴粒径的分布更加均匀。

To better address the problems with respiratory dust,a self-excited oscillation nozzle was developed with the consideration given to the research experience that finer atomization size encourages trapping respiratory dust.Unlike conventional internal mix atomizing nozzles,this nozzle included a self-excited oscillation baffle device by design,which achieved the purpose of enhancing atomization by increasing the disintegration times of mist droplets.A Marvin laser mist particle testing system was used to evaluate the atomization performance of this self-excited oscillation nozzle and it was found that the optimum matching option of this self-induced oscillation baffle was a 2mm diameter baffle installed at 7 mm away from the nozzle hole.The test demonstrated： compared with conventional internal mix atomizing nozzles this self-excited oscillation nozzle produced a same effective range,but its atomized droplets had a mean measured diameter DV50 of 13.85 μm,or smaller by 1/3,and its atomized droplets were more uniformly distributed in diameter size.