Cummins Uses Simulation to Reduce Injector Losses and Improve Spray Pattern for Performance Gains - Article

Internal fluid dynamics of diesel engine fuel injectors can have a major impact on engine performance. The fl ow inside the fuel injector influences the pattern with which fuel is sprayed into the engine, which, in turn, can impact combustion performance and emissions. Likewise, internal fl ow patterns affect fuel injector losses, and reducing these can improve fuel economy and engine performance. Cummins uses computational fluid dynamics (CFD) to simulate internal fluid dynamics of fuel injectors, paying particular attention to cavitation behavior, sac filling and pressure, and spray hole velocity and momentum. The robustness of the CFD software enables Cummins engineers to evaluate many design alternatives and iterate to an optimized fuel injector design with lower losses and a superior spray pattern, resulting insignificant improvements in engine performance.