Abstract
Bio gas fueled engines have proved effective in helping the environment; such as reducing methane gas which has a large greenhouse effect, alongside an ozone layer destructing effect, because the main composition of bio gas is methane, and it is not emitted into the atmosphere, but burned up within the engine. In this study, by combining the GRI-Kojima reduced elementary reaction scheme and the DME reduced elementary reaction scheme, which had been constructed by the authors' group, the authors constructed a reduced elementary reaction scheme originally for the mixture of bio gas, city gas, DME and air for investigating the combustion characteristics of a bio gas and city gas mixture fueled engine which was ignited with DME (dimethyl ether) spray. On the basis of chemical kinetics with the proposed elementary reaction scheme, the authors conducted three-dimensional numerical analysis of the combustion process within a practical computation time in a bio gas and city gas mixture fueled engine which was ignited with a small amount of DME spray, using different mixture ratios of bio gas and city gas.
