多孔喷油器闪急沸腾喷雾坍塌影响因素的仿真分析

Simulation analysis of influencing factors of flash boiling spray collapse of porous injector

使用Converge仿真软件对喷雾坍塌现象进行了研究并分析其原因,通过改变喷孔数目、环境压力、温度、油束喷射方向以及相邻喷孔径向间距等条件研究了喷雾坍塌程度的影响因素。结果表明:随着燃料温度的升高,发生闪沸现象的程度更加猛烈,喷雾锥角和喷雾宽度逐渐增大,喷雾中心难以与外部气体进行交换,使得喷雾中心的低压状况难以改善,油束在压力差作用下向中间聚拢,最终演变成喷雾坍塌现象。通过改变环境压力和温度可以发现:在适当提高环境压力后,喷雾坍塌现象会变得剧烈,而提高环境温度对喷雾坍塌程度并没有明显影响;通过改变喷孔数目、油束方向以及喷孔径向间距等手段改变油束间距对喷雾坍塌程度有较为明显的影响。

The Converge was used to study the spray characteristics of porous injectors under different fuel temperature conditions,and the influence on the spray collapse degree was studied by changing the number of nozzles,ambient pressure and temperature,oil beam injection direction and radial spacing of adjacent nozzles.The results show that with the increase of fuel temperature,the degree of flashing phenomenon is more violent,the spray cone angle and spray width increase,the spray center is difficult to exchange with the external gas,so that the low pressure condition of the spray center is difficult to improve,and the oil beam gathers to the middle under the action of pressure difference,and finally evolves into spray collapse.By changing the ambient pressure and temperature,it can be found that after appropriately increasing the environmental pressure,the spray collapse phenomenon will become violent,and increasing the ambient temperature has no obvious effect on the degree of spray collapse;Changing the oil beam spacing by changing the number of nozzle holes,the direction of the oil beam and the radial spacing of the spray holes has a significant effect on the degree of spray collapse.