抄録
Dimethyl ether (DME) is one of the most promising alternative fuels for the near future. For rapid spread, it is desirable to use the mixture of DME with LPG (mainly propane), because a mature supply infrastructure already in existence can be employed. However, using the mixture of LPG and DME as a fuel for a spark ignition engine causes a problem, knocking during combustion. In a previous study, the authors analyzed this knocking phenomenon by a three-dimensional combustion simulation based on a chemical kinetic model using a GTT-CHEM code. This code was constructed by linking the authors' GTT code to the CHEMKIN-II code. In this study, using this simulation technique, the authors have investigated the effect of combustion chamber shape on the knocking phenomenon. The authors have explored a new combustion chamber which can suppress this occurrence of knocking. A small gas engine for co-generation system was employed and obtained experimental data, for comparing with the numerical simulation results.
