Image Processing Applied to Flame Propagation and Ignition Delay Measurements in a Rapid Compression Machine

2013 ◽  
Author(s):  
Antonio Carlos Scardini Villela ◽  
Sergio William Botero ◽  
Guilherme Bastos Machado ◽  
Julio César Egúsquiza ◽  
Leonardo C. Braga ◽  
...  
Keyword(s):  
Image Processing ◽  
Flame Propagation ◽  
Ignition Delay ◽  
Rapid Compression Machine ◽  
Rapid Compression

Homogeneous Ignition Delay, Flame Propagation Rate and End-Gas Autoignition Fraction Measurements of Natural Gas and Exhaust Gas Recirculation Blends in a Rapid Compression Machine

2020 ◽  
Author(s):  
Jeffrey Mohr ◽  
Bret Windom ◽  
Daniel B. Olsen ◽  
Anthony J. Marchese
Keyword(s):  
Natural Gas ◽  
Flame Propagation ◽  
Ignition Delay ◽  
Exhaust Gas Recirculation ◽  
Propagation Rate ◽  
Delay Period ◽  
Exhaust Gas ◽  
Rapid Compression Machine ◽  
Gas Recirculation ◽  
Ignition Delay Period

Abstract To evaluate the effect of exhaust gas recirculation (EGR) and variable fuel reactivity on knock and misfire in spark ignited national gas engines, experiments were conducted in a rapid compression machine to measure homogeneous ignition delay, flame propagation rate, and end-gas autoignition fraction for stoichiometric natural gas/oxidizer/EGR blends. Natural gas with a range of chemical reactivity was simulated using mixtures of CH4, C2H6, and C3H8. Reactive exhaust gas recirculation (R-EGR) gases were simulated with mixtures of Ar, CO2, CO, and NO and non-reactive exhaust gas recirculation gases (NR-EGR) were simulated with mixtures of AR and CO2. Homogeneous ignition delay period, flame propagation rate and end-gas autoignition fraction were measured at compressed pressures and temperatures of 30.2 to 34.0 bar and 667 to 980 K, respectively. Flame propagation rate decreased with both R-EGR and NR-EGR substitution. The substitution of R-EGR increased the end-gas autoignition fraction, whereas NR-EGR substitution decreased the end-gas autoignition fraction. The results indicate that the presence of the reactive species NO in the R-EGR has a strong impact on end-gas autoignition fraction. An 82-species reduced chemical kinetic mechanism was also developed that reproduces measured homogeneous ignition delay period with a total average relative error of 11.0%.

A rapid compression machine study of autoignition, spark-ignition and flame propagation characteristics of H2/CH4/CO/air mixtures

2018 ◽  
Vol 188 ◽  
pp. 150-161 ◽  
Author(s):  
Changpeng Liu ◽  
Heping Song ◽  
Peng Zhang ◽  
Zhi Wang ◽  
Margaret S Wooldridge ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Spark Ignition ◽  
Rapid Compression Machine ◽  
Propagation Characteristics ◽  
Rapid Compression
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