Design and Operation of the Cryogenic Nitrogen Supply System for the Combustion Stability Rating Test of Liquid Rocket Engine

When developing a combustor, a combustion stability rating test must be performed. In this study, a cryogenic nitrogen supply system was designed as a preliminary study for the development of a non-cylindrical scale-down model combustor, which can determine whether combustion is unstable at the initial stage of combustor development. A cryogenic nitrogen supply system is an essential component for cooling and acoustic frequency regulation in the combustor. To verify the manufactured system, an ignition test at atmospheric pressure and a cryogenic nitrogen supply test were performed. And an operating procedure was established that could reliably ignite when a large amount of cryogenic nitrogen was supplied. After the test, there was no structural damage to the cryogenic nitrogen manifold, and the design mass flow rate was also stably supplied, so it is judged that the verification of the manufactured supply system has been completed.