Abstract

The uniformity of the fuel and air mixture in the cylinder of diesel engine directly affects the smooth running of the combustion process. In order to improve the atomization effect of the fuel in the cylinder, the super-high injection pressure exceeding 180MPa was used. The changing relationship between the physical properties of the non-normal fuel and the pressure under the influence of the super-high injection pressure was derived. The three-dimension combustion model of TBD620 diesel engine is constructed on the FIRE software platform. A numerical simulation of the two injectors’ fuel injection process under different load conditions has been done in the research work. The fuel spray characteristics has been simulated. The results show that the special fuel injector has a good performance under low loading conditions, but the standard fuel injector has better performance for oil and gas fully mixed under high loading conditions.

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