| IMPROVING THE PREDICTIVENESS OF THE QUASI-D COMBUSTION MODEL FOR SPARK IGNITION ENGINES WITH FLEXIBLE INTAKE |
| T.-K. LEE, Z. S. FILIPI |
| University of Michigan |
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| ABSTRACT |
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Fast and predictive simulation tools are prerequisites for pursuing simulation based engine control development. A particularly attractive tradeoff between speed and fidelity is achieved with a co-simulation approach that marries a commercial gas dynamic code WAVETM with an in-house quasi-dimensional combustion model. Gas dynamics are critical for predicting the effect of wave action in intake and exhaust systems, while the quasi-D turbulent flame entrainment model provides sensitivity to variations of composition and turbulence in the cylinder. This paper proposes a calibration procedure for such a tool that maximizes its range of validity and therefore achieves a fully predictive combustion model for the analysis of a high degree of freedom (HDOF) engines. Inclusion of a charge motion control device in the intake runner presented a particular challenge, since anything altering the flow upstream of the intake valve remains |
| Key Words:
Spark ignition (SI) engine, Quasi-dimensional combustion model, Variable intake system, Intake charge motion control, Calibration |
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