Experimental Study on Oxygenation Constant Volume Combustion Characteristics of Hydrogen Internal Combustion Engine

Due to the limitation of the limited propellant carried by spacecraft, the H2/O2 ICE for aerospace is suitable for pure hydrogen, pure oxygen and hydrogen-rich combustion. In order to realize the high-performance and reliable engines, it is particularly important to study the combustion characteristics of H2/O2 ICEs, and the technical route of hydrogen ICE constant volume combustion gradually increases oxygen is adopted to explore the combustion characteristics of hydrogen ICE under the condition of oxygen enhancement and even pure oxygen. The experimental contents include: the H2/O2 flame propagation process and laminar flow combustion area delineation in the constant volume combustion bomb; the flame propagation process and combustion characteristics of H2/O2 mixture under different equivalent ratios; the premixed laminar flow combustion characteristics of H2/O2 mixture under different O2 concentrations; combustion characteristics of premixed laminar flow of H2/O2 mixture under different temperature and pressure initial conditions. With the increase of the equivalent ratio, the combustion velocity gradually increases. and with the increase of O2 concentration, the laminar combustion velocity of the equivalent ratio to the H2/O2 flame will increase linearly and multiply, but the amplitude of the change will gradually decrease with the increase of the equivalent ratio. Under the condition of high O2 concentration, the combustion rate of laminar flow is maintained at a very high level, and the change with equivalent ratio is small.