Early Flame Development and Burning Rates in Spark Ignition Engines and Their Cyclic Variability

1987 ◽  
Author(s):  
James C. Keck ◽  
John B. Heywood ◽  
Georg Noske
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Cyclic Variability ◽  
Flame Development ◽  
Burning Rates

scholarly journals A Fast CFD-Based Methodology for Determining the Cyclic Variability and Its Effects on Performance and Emissions of Spark-Ignition Engines

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4131
Author(s):  
George M. Kosmadakis ◽  
Constantine D. Rakopoulos
Keyword(s):  
Spark Ignition ◽  
Pollutant Emissions ◽  
Computational Time ◽  
Spark Ignition Engines ◽  
Cyclic Variability ◽  
Indicated Mean Effective Pressure ◽  
Spark Plug ◽  
Performance And Emissions ◽  
Si Engines ◽  
Cyclic Variations

A methodology for determining the cyclic variability in spark-ignition (SI) engines has been developed recently, with the use of an in-house computational fluid dynamics (CFD) code. The simulation of a large number of engine cycles is required for the coefficient of variation (COV) of the indicated mean effective pressure (IMEP) to converge, usually more than 50 cycles. This is valid for any CFD methodology applied for this kind of simulation activity. In order to reduce the total computational time, but without reducing the accuracy of the calculations, the methodology is expanded here by simulating just five representative cycles and calculating their main parameters of concern, such as the IMEP, peak pressure, and NO and CO emissions. A regression analysis then follows for producing fitted correlations for each parameter as a function of the key variable that affects cyclic variability as has been identified by the authors so far, namely, the relative location of the local turbulent eddy with the spark plug. The application of these fitted correlations for a large number of engine cycles then leads to a fast estimation of the key parameters. This methodology is applied here for a methane-fueled SI engine, while future activities will examine cyclic variations in SI engines when fueled with different fuels and their mixtures, such as methane/hydrogen blends, and their associated pollutant emissions.

scholarly journals Numerical approach on the effects of gasoline-hydrogen blends on the cyclic variability in spark ignition engines

2016 ◽  
Vol 19 (2) ◽  
pp. 92 ◽  
Author(s):  
Santiago Daniel Martinez-Boggio ◽  
Pedro Luis Curto-Risso ◽  
Alejandro Medina ◽  
Antonio Calvo
Keyword(s):  
Numerical Approach ◽  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Cyclic Variability
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