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为了进一步提高超声激振喷嘴内部的湍流效果和提高喷嘴雾化效率,通过设置碰撞壁和振荡腔的结构对现有的超声喷嘴进行改进。利用哈特曼流体声波发生器原理,建立超声激振喷嘴雾化模型,利用CFD流体动力学仿真软件模拟喷嘴内部的流场,以喷距和碰撞壁角度两个主要参数对喷嘴出水口速度的影响。结果表明:通过分析喷嘴内部速度和压力流场云图发现喷嘴内部振荡腔和碰撞斜壁的设计会使喷嘴内部产生空化涡旋,空化涡旋内空化气泡的溃灭会增强流体的扰动,增强喷嘴内部流体的湍流的效果,增强喷嘴雾化的效果加强喷嘴内部流体的扰动效果,提高喷嘴的雾化效率;喷嘴射流速度随进口压力的增加表现出明显的增大趋势,射流速度对喷距的增加表现出明显的增加趋势,相比较之下碰撞壁角度对射流速度的影响不明显,经分析确定参数喷距L=1 mm,碰撞壁为60°时超声激振喷嘴雾化效果最好。
In order to further improve the turbulence effect inside the ultrasonic vibration nozzle and improve the atomization efficiency of the nozzle, an existing ultrasonic nozzle is improved by providing a structure of a collision wall and an oscillation cavity. The Hartmann fluid acoustic generator principle was used to establish the ultrasonic vibration nozzle atomization model. The CFD fluid dynamics simulation software was used to simulate the flow field inside the nozzle. The spray nozzle distance and collision wall angle influences. The results show that the cavitation vortex is generated inside the nozzle by the analysis of the internal velocity and pressure flow field in the nozzle. The collapse of cavitation bubbles in the cavitation vortex enhances the fluid disturbance , To enhance the turbulence of the fluid inside the nozzle to enhance the effect of nozzle atomization to enhance the fluid inside the nozzle disturbance effect and improve the atomization efficiency of the nozzle; nozzle jet velocity increases with the inlet pressure showed a clear trend of increasing jet velocity The increase of spray distance showed a clear trend of increase. In contrast, the effect of collision wall angle on jet velocity was not obvious. The atomization effect of ultrasonic vibration nozzle was confirmed by analyzing the parameters of spray distance L = 1 mm and collision wall 60 ° the best.