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An integrated 1D/3D workflow for analysis and optimization of injection parameters of a diesel engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 23, 2001 by Consiglio Nazionale delle Ricerche in Italy
The present contribution gives an overview of the use of different simulation tools for the optimization of injection parameters of a diesel engine. With a one-dimensional tool, the behavior of the mechanics and fluid dynamics of the entire injection system is calculated. This simulation provides information on the dynamic needle lift, injection rates, pressures, etc.
The flow within the injector is simulated using a three-dimensional CFD tool. By use of a two-phase model, it is possible to analyze the cavitating flow inside the injector and to calculate the effective nozzle hole area as well as the exit flow characteristics. Mixture formation, combustion and pollutant formation simulation is performed adopting three-dimensional CFD. In order to provide the initial and boundary conditions for the engine CFD simulation and to optimize the engine cycle performance a one-dimensional tool is adopted.
The way that these simulation tools can be applied together will be demonstrated on relevant application examples from the engine development showing how the two main challenges - fuel consumption and pollutant emissions - can be met.