engleski

QUASI-DIMENSIONAL DIESEL ENGINE MODEL WITH DIRECT CALCULATION OF CYLINDER TEMPERATURE AND PRESSURE

This paper describes the quasi-dimensional numerical model, implemented in previously developed 0D model. The presented model uses direct solution of equations for cylinder pressure and zone temperatures, without numerical iterations which are customary for these models. In the model there is shown a process of averaging from a set of small fuel spray packages (volumes) into big ones, which is a necessary precondition for the numerical stability. The model uses about fifty submodels. Simulations were performed in eight operating points, on four most sensitive engine cylinder operating parameters. Direct solution of temperature and pressure changes, in conjunction with the fuel spray packages averaging, represents a contribution to quasi- dimensional diesel engine process modelling.

combustion ; diesel engine ; emissions ; fuel spray ; quasi-dimensional (phenomenological) model

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