2004 年 70 巻 699 号 p. 2922-2927
This study tried to control rapid combustion of hydrogen fuel. Experiment was carried out using constant volume chamber. Hydrogen was injected in this chamber using gas injector and the jet was ignited by a spark plug. High-speed schlieren photography method using high-speed digital video camera was employed to observe combustion process of hydrogen jet. Combustion process was analyzed by the photographs and pressure history. It has been shown by the results that igniting hydrogen spray can control rapid combustion. The spark plug should be located in the boundary of the spray near the outlet of injector in order to reduce initial pressure rise of hydrogen combustion. This kind of injector location also improves combustion efficiency, because combustion continues mainly in the internal of the chamber leading to the reduction of quenching on the wall. Early ignition during injection further reduces initial rapid pressure rise of hydrogen jet.