The Theoretical Analysis And Experimental Study On The Atomization Characteristic Of The Self-excited Oscillation Pulsed Nozzle

Liquid jet is a widespread phenomenon in nature and also has a very wide range of applications in various engineering fields. Nozzle is the key component to realize atomization, with the rapid development of science and technology, various types of nozzles have been created,but many have complex structure or require additional external auxiliary devices,which lead to difficult processing,so the development and application will no doubt be significantly restricted.Nozzle is the key component to realize atomization,In order to improve the quality of the liquid jet atomization, An important way is to increase the system pressure of the fluid jet, However ,This measure will also generate some new problems while improving the atomization quality of the liquid jet, Such as the declining of system reliability and the rising of cost. Under these circumstances, the use of self-excited oscillation pulsed water jet nozzle to improve the quality of the jet atomization is proposed in this dissertation,the nozzle structrue is simple. The experimental system of jet atomization is established,The variation of the external jet characteristic parameters with system pressure is also explored,The atomization effect is compared with that of the continuous-jet nozzle and swirl-atomizer.The mechanism of liquid jet atomization and basic theory of self-excited oscillation pulsed water jet were presented. the factors affecting the jet atomization and the action principle were also analysed, And how to get better pressure oscillations in order to achieve the best atomization effect of the liquid jet.The experimental study of the variation of external jet characteristic parameters(spray distance,apray angle,atomized particle size) with system pressure is proposed,under the same system pressure,the apray angle of swirl-atomizer is the largest,but the spray distance of self-excited oscillation pulsed water jet is the longest,while the atomized particle size is the smallest. Experimental results show that under the same conditions, self-excited oscillation pulsed water jet nozzle has the best atomization effect.