J. Phys. IV France 10 (2000) Pr11-143-Pr11-153
Numerical modeling and simulation of RAMAC 30 experiment carried out at the French-German research institute of Saint-LouisG.-W. Moon1, I.-S. Jeung1, J.-Y. Choi2, Y. Yoon1, F. Seiler3, G. Patz3, G. Smeets3 and J. Srulijes3
1 Department of Aerospace Engineering, Seoul National University, Seoul 151-742, Korea
2 Department of Aerospace Engineering, Pusan National University, Pusan 609-735, Korea
3 Shock Tube Department, French-German Research Institute of Saint-Louis, ISL, BP. 34, 68301 Saint-Louis, France
A ram accelerator experiment which was done in ISL's RAMAC 30, was numerically simulated in this study. The case of shot 225 was considered and the initial projectile launching speed was 1.8 km/s which corresponded to the superdetonative speed of the stoichiometric H2/O2 mixture diluted with 5CO2. CFD code had some enhanced features suitable for the high-pressure gaseous combustion. In this study, it was found that neither shock heating nor 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 acceleration of the shot 225 with an aluminum-covered projectile in reasonable agreement. Some additional studies were preformed concerning the location of the forced ignition and the conical angle of the projectile. The results gave some insights into the combustion mechanism and the condition of positive acceleration in a scram accelerator.
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