On the Method for Hot-Fire Modeling of High-Frequency Combustion Instability in Liquid Rocket Engines

This study presents methodological aspects of combustion instability modeling and provides the results of calculation of model (sub-scale) combustion chamber regarding geometrical dimensions and operating conditions, which are for the determination of combustion stability boundaries using model chamber. An approach to determining stability limits and acoustic characteristics of injectors is described intensively. Procedures for the extrapolation of model operating parameters to actual conditions are presented, which allow the hot-fire test data to be presented by the parameters of combustion chamber pressure and mixture (oxidizer/fuel) ratio, which are customary for designers. Tests with model chamber, based on the suggested scaling method, are far more cost-effective than with actual (full-scale) chamber and useful for injector screening at the initial stage of combustor development in a viewpoint of combustion instabilities. KCI Citation Count: 12