Numerical Investigation on the Effect of Fuel Temperature on Spray-wall Impingement Characteristics in GDI engines

Paper #:
  • 2017-01-2311

Published:
  • 2017-10-08
Abstract:
Spray impingement is a key factor in affecting the particulate matter (PM) emission in gasoline direct injection (GDI) engines. Current knowledge of spray impingement and wall-wetting phenomenons are mostly based on the studies that the fuel is injected at ordinary temperature and various ambient conditions. While in the real GDI engine, the fuel pipe and injector are always heated up by the pump and the engine body, especially at hot engine conditions, thus the fuel temperature is always higher than the ordinary temperature, and the relevant research is still limited. The aim of this study is to numerically investigate the spray-wall impingement characteristics under different fuel temperature and various ambient conditions in GDI engines, so as to provide theoretical support in optimizing the mixture formation process and further reducing the PM emission. The spray model was calibrated with the high-speed imaging and PDPA (Phase Doppler Particle Analyzer) experiments. The results showed that increasing the fuel temperature decreased the impinged fuel area and the propagation length, and the fuel film thickness was also reduced by better dispersion, quicker evaporation and less deposited fuel. The proportion of high fuel concentration near the impact surface was also reduced by increasing fuel temperature. The increase of fuel temperature is believed to be an effective and practical way to alleviate the adverse effects of impingement.
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