Experimental Validation of Spray Breakup and Fuel Evaporation Models in High Pressure Ambient Conditions

Abstract

Experimental and numerical computations of transient sprays are performed under ambient Diesel like conditions, in order to investigate on the complex phenomena that occur in the evolution of an evaporating fuel spray (like break up, fuel multicomponent evaporation, liquid gas interaction). An experimental analysis has been carried out using a single hole high pressure electronic control injection system. The investigation procedure exploits a light sheet technique based on a Nd-Yag pulsed laser and a synchronized CCD camera. The measured characteristics are the spray penetration and the spray cone angles, as the fuel jet evolves in a pressurized chamber. Furthermore, a numerical analysis of the spray development has been carried out. The numerical tool used is a modified version of the well known KIVA code in which a new break up model, developed and validated in previous works [1, 2], and a fuel multicomponent evaporation model have been included. The predictive capability of the evaporation model has been evaluated by comparison with single droplet experimental data [3].