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Experimental Study of Emission Characteristics of a Small Hydrogen S.I. Engine
Published October 30, 2007 by Society of Automotive Engineers of Japan in Japan
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In an attempt to grab potential issues with a hydrogen direct injection lean burn engine to have similar power output to a gasoline-fuelled engine, emission characteristics of a hydrogen engine was investigated. It is demonstrated that low NOx emission can be achievable without any catalytic converter. Two major issues, however, have been recognized, that is, combustion instability at low load conditions and too low temperature of exhaust gas to get enough boosting pressure. Hydrogen concentration heterogeneous of the mixture was focused in the CFD and visualization study. Hydrogen jet design of an injector could contribute to improvement of mixing.
CitationOHIRA, T., NAKAGAWA, K., YAMANE, K., KAWANABE, H. et al., "Experimental Study of Emission Characteristics of a Small Hydrogen S.I. Engine," SAE Technical Paper 2007-32-0074, 2007.
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