Influence of Blend Ratio and Injection Parameters on Combustion and Emissions Characteristics of Natural Gas-Diesel RCCI Engine

Experimental and Computational Investigation of Dual Fuel Diesel- Natural Gas Rcci Combustion in a Heavy-Duty Diesel Engine

“…This results in lower peak combustion temperatures and pressures that provide a sharp reduction in NOx emissions. As observed by many researchers, this heat release trace is wider with a lower peak and clearly visible two-stage heat release associated with RCCI combustion [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

“…Emissions and performance parameters for dual fuel combustion at 1500 rpm and 5 bar BMEP, plotted against CNG substitution [12] Recently, researchers [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] have explored the possibility of applying advanced diesel injection events to improve the combustion efficiency of the dual fuel diesel/natural gas engines at part load. This strategy has also been evaluated on diesel/gasoline engines and the type of combustion that is achieved has been termed reactivity controlled compression ignition, or RCCI, due to the nature of the reactivity (cetane) distribution achieved within the cylinder [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. RCCI combustion specifically exploits the difference in reactivity between two fuels by introducing the low cetane fuel (natural gas) along with the air during the intake stroke and igniting the air-natural gas mixture by injecting the higher cetane fuel (diesel) later in the compression stroke.…”

“…In further review of the existing work, none of the CFD studies conducted to date to evaluate RCCI combustion with diesel/natural gas in heavy-duty diesel engines have provided a comprehensive comparison between the CFD predictions and test results for different control parameter settings. CFD studies conducted by Khatamnejad et al [27] on a heavy duty diesel engine compare the cylinder pressure and heat release rate predictions between CFD and experimental results for four different diesel injection timings using detailed chemistry at 1500 rpm and 6 bar BMEP. The author report that compared to the experimental data the cylinder pressure predictions in CFD are lower for the most retarded timing (8 bTDC) and higher for the most advanced timing (35 bTDC) investigated.…”

Improvement of performance and emission in a lean‐burn gas fueled spark ignition engine by using a new pre‐chamber

“…6 Natural gas, including no sulfur, reduces the sulfur oxide emissions and practically reduces the emissions of particulate matter. 7 Moreover, natural gas with a higher-octane number provides a higher compression ratio and effects in higher fuel efficiency, notably in lean-burn form. 8 However, in natural gas engines, NOx is a critical issue.…”