Study on the Characteristics of Fuel Spray Impingement and Film Evaporation
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.
spray impingementfuel filmevaporationprediction model
万方数据
维普
