Abstract:
The paper presents a mathematical model and a calculation algorithm for numerical studies of physical and chemical processes in the engines with prechamber ignition. The
prechamber ignition is currently the subject of active research due to its potential to improve the combustion efficiency, especially in case of the hybrid powertrain configuration. A new approach for modeling the prechamber ignition is proposed, which consist of
a combination of the control-volume method, predefined parameters of the turbulence
and direct coupling calculations on base of the fictitious domain method. It allows to use
relatively coarse and regular meshes that reduces demands in the computational resources
and leads to faster simulation times. Only the one adjustable parameter (if the turbulence
field is known) should be tuned in the model. The modeling is conducted in a direct
coupling way. The volumes of the prechamber and the conducting ducts are separated on
base of the fictitious domain method. The mesh for the main chamber has a moving
boundary. The calculation of local flow parameters is based on the control volume method, applying staggered grids for components of the velocity vector and scalar variables.
The mathematical model can be used in addition to CFD simulations for their preliminary planning in case when the experimental data is not yet available (at the stage of the
layout design). The results of calculations can be used as initial conditions for determination the engine knock probability. The program can be applied for calibration of the engine control unit.
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