Modeling of Wall Impinging Behavior with a Fan Shaped Spray

The experiment-based droplet impinging breakup model was applied to a fan shaped spray and the impinging behavior was analyzed quantitatively. Evaluation of the quantitative results with validation tests verified the following.

• The model enables prediction of fan shaped spray thickness after impingement caused by the breakup of fuel droplets, which could not be represented with the Wall-Jet model, widely used at present.
• Fuel film movement on a wall is negligible when the injection pressure of the fan shaped spray is high and the spray travelling length is not too short.
• The proposed heat transfer coefficient between fuel film and the wall is too small to represent the vaporizing rate of the fuel film.