3种压力型喷嘴在高速气流中的喷雾特性对比OA

This study presents a systematic investigation into the transverse spray dispersion characteristics of three pressure nozzles,a self-excited sweeping nozzle,a plain-orifice nozzle,and a hollow-cone swirl nozzle,under high-speed crossflow conditions at Mach number 0.4.Initial characterization of their fundamental atomization performance was conducted in quiescent air,followed by spray field visualization in high-speed flow using planar laser Mie scatter-ing imaging to quantify transient spray structures and time-averaged droplet concentration distributions.The results show that the self-excited sweeping nozzle demonstrated intermediate atomization performance between plain-orifice nozzle and hollow-cone swirl nozzle in quiescent environment.In high-speed crossflow,however,the self-excited sweeping nozzle achieves a 67%greater maximum penetration depth than the swirl nozzle and reaches 79%of that of the plain-orifice nozzle,and its spanwise spread distance matches the swirl nozzle,both 150%exceeding the plain-orifice nozzle.Assuming a rectangular spray distribution area,the total coverage area of the self-excited sweeping nozzle is 1.67 times that of the swirl nozzle and 2.17 times that of the plain-orifice nozzle.Moreover,the high-concentration droplet regions in both the central and lateral cross-sections of the self-excited sweeping nozzle are sig-nificantly larger than those of the other two nozzles,demonstrating superior spray uniformity.This study preliminarily confirms the unique advantages of the self-excited sweeping nozzle in enhancing spanwise diffusion,total spray cover-age,and distribution uniformity in high-speed airflow environments.These findings provide a novel technical solution for liquid injection applications under high-speed airflow conditions such as scramjet/afterburner combustors and jet precooling systems.