Diluents and Lean Mixture Combustion Modeling for SI Engines with a Quasi-Dimensional Model

1995 ◽  
Author(s):  
Wen Dai ◽  
George C. Davis ◽  
Matthew J. Hall ◽  
Ronald D. Matthews
Keyword(s):  
Dimensional Model ◽  
Lean Mixture ◽  
Combustion Modeling ◽  
Si Engines

The Lean Mixture Operational Limits of a Spark Ignition Engine When Operated on Fuel Mixtures

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Hailin Li ◽  
Ghazi A. Karim ◽  
A. Sohrabi
Keyword(s):  
Engine Performance ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Lean Mixture ◽  
Si Engines ◽  
Unstable Combustion ◽  
Fuel Mixtures ◽  
Traditional Approaches ◽  
Combustion Processes

The operation of spark ignition (SI) engines on lean mixtures is attractive, in principle, since it can provide improved fuel economy, reduced tendency to knock, and extremely low NOx emissions. However, the associated flame propagation rates become degraded significantly and drop sharply as the operating mixture is made increasingly leaner. Consequently, there exist distinct operational lean mixture limits beyond which satisfactory engine performance cannot be maintained due to the resulting prolonged and unstable combustion processes. This paper presents experimental data obtained in a single cylinder, variable compression ratio, SI engine when operated in turn on methane, hydrogen, carbon monoxide, gasoline, iso-octane, and some of their binary mixtures. A quantitative approach for determining the operational limits of SI engines is proposed. The lean limits thus derived are compared and validated against the corresponding experimental results obtained using more traditional approaches. On this basis, the dependence of the values of the lean mixture operational limits on the composition of the fuel mixtures is investigated and discussed. The operational limit for throttled operation with methane as the fuel is also established.

A Quasi-dimensional Model of the Ignition Delay for Combustion Modeling in Spark-Ignition Engines

2015 ◽  
Vol 137 (7) ◽  
Author(s):  
Sebastian Grasreiner ◽  
Jens Neumann ◽  
Michael Wensing ◽  
Christian Hasse
Keyword(s):  
Ignition Delay ◽  
Direct Injection ◽  
Control Unit ◽  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Combustion Modeling ◽  
Crank Angle ◽  
Si Engines ◽  
Engine Map ◽  
Start Of Combustion

Quasi-dimensional (QD) modeling of combustion in spark-ignition (SI) engines allows to describe the most relevant processes of heat release. Here, a submodel for the ignition delay is introduced and applied. The start of combustion is considered from ignition to the crank angle of 5% burned gas fraction. The introduced physical approach identifies the turbulent propagation velocity of the initiated kernel by taking into account early flame expansion and geometric restrictions of the flame propagation. The model is applied to stationary operation within an entire engine map of a turbocharged direct injection SI engine with fully variable valvetrain. Based on provided cycle-averaged input data, the model delivers good results within the margins of measured cycle-to-cycle fluctuations. Thus, it contributes to the assessment of the interplay between engine, engine control unit, drivetrain, and vehicle dynamics, hence making a step toward optimization and virtual engine calibration.

Toward Predictive Combustion Modeling of CNG SI Engines in 1D Simulation Tools

2020 ◽  
Author(s):  
Marco Riccardi ◽  
Daniela Tufano ◽  
Carlo Beatrice ◽  
Fabio Bozza ◽  
Vincenzo De Bellis ◽  
...  
Keyword(s):  
Combustion Modeling ◽  
Simulation Tools ◽  
Si Engines

Combustion Modeling in SI Engines with a Peninsula-Fractal Combustion Model

1996 ◽  
Author(s):  
Ronald D. Matthews ◽  
Matthew J. Hall ◽  
Wen Dai ◽  
George C. Davis
Keyword(s):  
Combustion Model ◽  
Combustion Modeling ◽  
Si Engines
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