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A Numerical Study on Evaluating the Performance of a Turbocharged Spark Ignition Natural Gas Engine
Published October 03, 2012 by Society of Automotive Engineers of Japan in Japan
Natural gas is one of the most promising alternative automotive fuels for its favorable combustion characteristics and availability to address environmental and energy issues. A numerical simulation model has been developed to achieve high efficiency, downsizing and weight reduction in a spark ignition natural gas engine by utilizing an intercooled turbocharging system. The model includes combustion, turbocharging and intercooling processes. An additional model is combined with the model to predict knock occurrence associated with unburned end gas and combustion chamber surface temperatures under both steady state and transient conditions. Thus, the model developed can optimize the spark ignition timing to achieve high thermal efficiency along with avoiding knock.