Quantitative Clarification of Stable Ignition Region for HKP110 Green Hypergolic Bipropellant

Abstract

As a candidate for a green hypergolic bipropellant, the combination of highly concentrated hydrogen peroxide and fuel with dissolved sodium borohydride has been widely studied. In this study, a drop test using such a green hypergolic bipropellant was conducted to investigate the stable ignition region in terms of the mixture ratio. As a result, stagnation phenomena of flame growth were observed in high mixture ratio conditions. In addition, impinging-jet tests using a windowed chamber were conducted with the green hypergolic bipropellant to observe the ignition phenomena inside the combustion chamber. As a result, unstable ignition phenomena were observed in oxidizer-lead injection cases. Besides the unstable ignition, hard starts occurred several times during the test series. Data analysis demonstrated that controlling the transient mixture ratio in the early phase of injection is essential for preventing unstable ignition and hard starts. The quantitative threshold of mixture ratio for stable ignition was clarified based on the test results.

Influence of Adding Carbonaceous Fuels to Ionic Liquids on Propellant Properties

“…Bipropellants are widely applied in various areas, including liquid rocket engines, space engines, and guided missiles. 1 Their application has several benefits, e.g., when used in space engines, attitude and orbit control can be implemented with the anticipative property of the engine being operated in pulse mode with a low thrust. Moreover, the wide range of thrust and higher specific impulses than solid propellant rockets render it important in rocket engines.…”