Experimental investigation on flowrate characteristics of gaseous hydrogen/gaseous oxygen injector

Experimental investigation on flowrate characteristics of two different types of GH₂/GO₂injectors at different back pressure conditions were used for hot fire test. The effect of the fuel injector on oxidizer injector and the effect of pressure drop on the flowrate characteristics were investigated. The results show that the discharge coefficient of oxidizer injector is bigger than the oxidizer working alone when the oxidizer injector and the fuel injector are simultaneously working, as the back pressure changed from 0.2MPa to 4MPa. The discharge coefficient of the oxidizer injector and the fuel injector becomes bigger with the increase of pressure drop, but the trend becomes slower. The results presented in this paper may provide valuable reference for the design and improvement of the gas-gas injector.