Performance Characteristics of Hydrogen Peroxide/Kerosene Staged-Bipropellant Engine with Axial Fuel Injector

摘要

A1200 Nvacuum-thrust-class staged-bipropellant engine that uses decomposed hydrogen peroxide as an oxidizernand kerosene as a fuel was developed and tested with the aim of investigating an axial fuel injector integrated with andistributor. This fuel injector geometry, where fuel is injected into the turbulent flow of decomposed hydrogennperoxide, was tested to evaluate the influence of the designed injector on engine performance with respect to thenequivalence ratio, the pattern of fuel injection orifices, and the characteristic length Lu0001. For characteristics such asnautoignition and stable combustion, firing tests over awide range of equivalence ratios from0.26 to 1.86were carriednout. Autoignition was successfully achieved under all experimental conditions. The pressure rising time fromnmonopropellant to bipropellant mode and the pressure fluctuation in the combustion chamber were approximatelyn100 ms and less than u00021:1%, respectively. In the parametric study, the characteristic velocity cu0001 and its efficiencynwere influenced by the pattern of fuel injection, whereas varying the orifice diameter had no effect. The effect of Lu0001nwas also estimated, and the cu0001 efficiency was measured to be over 95%for all equivalence ratios at an Lu0001 of 1.20 m.