Three-dimensional numerical investigation on wall film formation and evaporation in port fuel injection engines

Abstract

Wall film formation and evaporation were studied on a flat wall inside a constant-volume vessel using a three-dimensional numerical method. The computation was based on the discrete phase model (DPM) of spray dispersion, a spray-wall interaction model coupled with an enhanced wall film evaporation sub-model, in which the operating conditions of cold wall are considered for port fuel injection (PFI) engines. The influence of impacting parameters including injection pressure, the impingement distance from the injector and the impinged wall, injection duration, impingement angle, and wall temperature was discussed. ARTICLE HISTORY

Combined experimental and numerical study on fuel deposition characteristics of an impinging PFI spray with different impingement geometries

“…The effects of wall condition (dry/wet), wall temperature, and liquid film thickness on the droplet-wall interaction regimes were also considered. A critical Weber number was also introduced to distinguish the regime transition under wet wall conditions, which was based on the experimental investigation of Cossali et al 26 Senda model has been adopted in many recent studies, [27][28][29][30] and the improved agreement between the numerical predictions and experimental measurements was reported.…”