The results of multiple injections show that, the pilot injection reduced the ignition delay and premixed combustion of the main injection.

Multiple injections coupling with EGR is regarded as one of the most important technology of modern diesel engine.

The combustion process of a heavy duty DI diesel engine with typical split injection was calculated,and simulated parameters were modified through the comparison with experimental results.

Based on the PW2000 fuel injection pump,by fuel injection pump performance testing and comparing,the influences of delivery valve s opening pressure,diameter of fuel returning hole and seat angle of returning valve on injection pump pressure,nozzle pressure,residual pressure,injection pattern,secondary injection and cavitations were discussed in this paper.

On the base of the PMS type pump, which is produced by Weifu group company and powerful in in-line pumps, under high injection pressure the influences of three kinds of basic delivery valves on the comprehensive performance, such as pump pressure, nozzle pressure, residual pressure, injection rate, secondary injection and cavitation, are investigated.

The numerical simulation three-dimensional and two-phase turbulent reactive flow in a annular combustor is conducted and the performance of combustion from two aspects of the combustor structure and multiple injections is discussed,where RSM Reynolds-stress turbulence model,EBU-Arreniue combustion model and discrete ordinate radiation model are employed.

Based on the numerical simulation, the air flow, mixture of air and fuel, combustion in the combustor are simulated from the point of the multiple injections firstly.