A one-dimensional non-stationary spray impinging model was constructed.Several key factors like drop-let evaporation,fuel film spreading and fuel film surface temperature were considered in this model.For fuel spray impingement,staged modeling was used.In the free penetration stage,the spray was described using a liquid phase penetration length prediction model and droplet evaporation model,then the impingement moment was de-termined.In the spray impingement stage,the spray was simplified to the spray impingement process of the micro-element droplets.Coupling the droplet evaporation model,the fuel film surface temperature model and the fuel film evaporation model,a one-dimensional unsteady normalized model was constructed to predict the fuel film across the spray impingement stage,the fuel film spreading stage and the fuel film evaporation stage with spread-ing radius of the fuel film as the characteristic parameter.The results show that the staged and discretized one-dimensional unsteady impingement spray model can accurately predict the spray penetration,near-wall spreading,fuel adhesion and evaporation processes under a wide range of ambient temperatures.It is found that in-creasing the ambient temperature and decreasing the ambient pressure can increase the maximum temperature of the fuel film surface and accelerate the evaporation rate of the fuel film.
关键词
喷雾撞壁/油膜/蒸发/预测模型
Key words
spray impingement/fuel film/evaporation/prediction model
维普
万方数据