ID 147

Experimental and Numerical Study on Impinging Fuel Spray under High-Pressure Cross-Flow Condition

 

Abstract:

It is certified that the fuel spray is strongly affected by both in-cylinder air flow and piston cavity wall impingement in a direct injection (DI) engine. In this study, sprays injected by a valve covered orifice (VCO) nozzle were tested by a high-speed video camera and a continuous wave laser sheet under a wind-tunnel with cross-flow and pressurized ambience, thereby the spray profiles and droplet velocity distributions were investigated. Moreover, the experiment results were compared with simulations which was calculated by the validated spray models based on the CONVERGE software. Numerous tiny droplets were observed to be entrained and shifted downstream when the spray was injected into the cross-flow. Moreover, with increase in the cross-flow velocity, the spray tip penetration evidently increased, and the increased cross-flow velocity led to an increase in the vortex height because of the enhanced spray dispersion. Furthermore, the high ambient pressure restrains the spray dispersion and leads to smaller spray tip penetration and vortex height. From the calculations, the cross-flow and ambient pressure effects on fuel spray are agree well with experimental results, thus more details were analyzed by the simulations.