Numerical modeling and simulation of RAMAC 30 experiment carried out at the French-German research institute of Saint-Louis

A ram accelerator experiment which was done in ISL's RAMAC 30, was numerica lly simulated in this study. The case of shot 225 was considered and the in itial projectile launching speed was 1.8 km/s which corresponded to the sup erdetonative speed of the stoichiometric (H2O2)-O-/, mixture diluted with 5 CO(2). CFD code had some enhanced features suitable for the high-pressure g aseous combustion. In this study, it was found that neither shock heating n or viscous heating was sufficient to ignite the mixture at the low speed of 1.8 km/s, as was found in the experiments using a steel-covered projectile . However, we could succeed in igniting the mixtures by imposing an amount of additional heat to the combustor section and simulate the positive accel eration of the shot 225 with an aluminum-covered projectile in reasonable a greement. Some additional studies were preformed concerning the location of the forced ignition and the conical angle of the projectile. The results g ave some insights into the combustion mechanism and the condition of positi ve acceleration in a scram accelerator.