Paper presented at the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July, 2010.
Owing to its both economical and environmental qualities, natural gas is one of the most interesting and promising available fuels for internal combustion engines. However, optimization of engine design requires extensive engine testing. Therefore, engine modeling codes are generally preferred for evaluating initial designs. Two-zone model is one of the most interesting simulation tools, especially for natural gas SI engines, due to the combustion type in this case. On the other hand, about one third of the fuel energy is transformed to heat loss from the chamber walls. Hence, the accuracy of the simulation depends on the precision of the heat transfer model. However, in the previous studies, using two-zone models, many choices are made for heat transfer evaluation and no choice influence study has been carried out. The current study aims to investigate the effect of the choice of the heat transfer correlation and provide an optimized choice for a more accurate two-zone combustion model in the
case of natural gas SI engines. For this purpose, a computer simulation is used, and experimental measurements are used for comparison and validation.
