Society of Automotive Engineers, Inc., 2003. — 11 p.Abstract
A comprehensive model for sprays emerging from highpressure swirl injectors in DISI engines has been developed accounting for both primary and secondary atomization. The model considers the transient b ehavior of the pre-spray and the steady-state behavior of the main spray. The pre-spray modeling is based on an empirical solid cone approach with varying cone a ngle. The main spray modeling is based on the Liquid Instability Sheet Atomization (LISA) approach, which is extended here to include the effects of swirl. Mie Scattering, LIF, PIV and Laser Droplet Size Analyzer techniques have been used to produce a set of experimental data for model validation. Both qualitative comparisons of the evolution o f the spray structure, as well as quantitative comparisons of spray tip penetration and droplet sizes have been made. It is concluded that the model compares favorably with data under atmospheric conditions. However, discrepancies occur under higher ambient pressures, suggesting that the physics of the breakup mechanism should be further investigated for these conditions.
