Effects of high-temperature fuel on in-cylinder fuel mixture formation process for direct injection engine

摘要

Swirl injector spray at high fuel temperatures has unique characteristics compared to normal fuel temperature spray such as strong penetration and narrow spray width. These characteristics have a possibility for improving fuel consumption and exhaust emission at the cold-start condition. Thus, swirl injector spray at high fuel temperature conditions was modeled in a CFD (Computational Fluid Dynamics) code by using a multi-components fuel evaporation model and other spray sub-models to predict the mixture formation process at the cold-start condition. Results show that, high-temperature fuel decreases wall film amount and increases vapor amount. It can be concluded that high-temperature fuel has the possibility for improving fuel consumption and exhaust emission at the cold-start condition.