Computer Simulation of the GM Unit Injector

Future improvements in diesel engine fuel economy, while continuing to meet legislated emission standards, will require an increased understanding of the diesel combustion process. The fuel injection system plays a major role in establishing conditions before and during combustion; and, therefore, its contribution to the development of an optimum combustion system is important. This paper describes a mathematical simulation of the General Motors Unit Injector and its application to the combustion system development process. Simulation results are compared to test data from a comprehensive experimental program.