Effect of fuel injector´s parameters on HSDI diesel engine´s performance

Three schemes are adopted, which are combined with different spray angle of nozzles and spray penetration of the HSDI diesel. By means of FIRE software, the engine performances are predicated based on the key parameters, such as fuel-air equivalence ratio, flow velocity, NO_x and soot concentration, and the combustion, NO_x and soot´s formation process are analyzed. If the fuel spray process could promote more air involving, the fuel spray would be atomized finer, then the combustion, power performance and fuel economy would be better, and the soot will be formed less but more NO_x. Through comprehensive evaluation function, the compromise scheme is chosen which is compromised with better fuel economy, higher power performance, and low NO_x and soot emissions. The best scheme which is validated by the 14 conditions test is the same with the simulation study´s result. It´s concluded that the simulation with software FIRE is very useful for the optimization of fuel injector´s parameters.