多段対向噴霧方式による不均質燃焼場の燃焼改善に関する研究

ー特に噴射タイミングによる予蒸発および燃料性状の影響ー

抄録

In recent years, to realize a sustainable society, internal combustion engines are required to reduce carbon dioxide emissions by using new energy such as hydrogen and artificial methane fuel, and to improve the efficiency of existing engines. As one of the improvement methods of the latter, the authors have been studying the multi-stage impinging injection method, which is a combination of multi-stage injection and impinging spray. The multi-stage impinging injection method is a method in which fuel is injected in multiple stages from two facing fuel nozzles. By using this method, it is possible to reduce unburned components due to spray collision in the center of the combustion chamber and to improve combustion by promoting pre-evaporation by early injection before ignition. It has been suggested that combustion can be improved by the accelerating effect ^{(1), (2), (3)}. In this study, as the next step, to improve the combustion improvement effect of the impinging injection method, we investigated the influence of pre-evaporation and fuel properties due to changing the impinging injection timing on combustion characteristics.