Abstract
Hydrogen has higher burning velocity and shorter quenching distance than hydrocarbons, and combustion characteristics of hydrogen in internal combustion engines are different from hydrocarbons. Authors have reported influencing factors to thermal efficiency in a hydrogen fueled spark ignition engine, and shown that heat release rate is very important in the thermal efficiency analysis. Error factors in calculation of heat release rate were analyzed in this research. Results show that hydrogen combustion with higher burning velocity than hydrocarbons has faster change in specific heat during combustion period, and it is better to include the term of dk/dθ especially in evaluation of cooling loss ratio. Influences of coolant temperature and engine speed on thermal efficiency were also analyzed in this research.
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