Experimental study on hydrogen constant volume combustion

Hydrogen constant volume combustion was investigated by using a constant volume combustion bomb and a high-speed data acquisition system. The pressure change in the hydrogen constant volume combustion bomb was summarized and the rules of the combustion-explosion pressure and the explosion constant were generalized. The combustion pressure changing in the constant volume bomb with central ignition can be described in the following process. The combustion which was interfered by ignition was at a constant pressure, the pressure increased slowly at first, and then increased rapidly during the combustion. There would be a pressure oscillation in the later half stage of the combustion. If it was not under the extreme conditions, the explosion peak pressure increased firstly and then decreased with the fuel equivalence ratio increasing. There was almost a linear relation between the initial pressure and the peak pressure. The explosion pressure and peak pressure decreased with the initial temperature increasing. The explosion constant increased firstly and then decreased with the fuel equivalence ratio increasing, too. When the fuel equivalence ratio was lower than 4, the explosion constant increased with the initial pressure increasing, or vice versa. When the fuel equivalence ratio was lower than 2.5, the explosion constant decreased with the temperature increasing. And when the fuel equivalence ratio was higher than 2.5, it was just the opposite. ©, 2014, Explosion and Shock Waves. All right reserved.