J. Phys. IV France 10 (2000) Pr11-131-Pr11-141
Computational modeling of high pressure combustion mechanism in scram acceleratorJ.-Y. Choi1, B.-J. Lee2 and I.-S. Jeung3
1 Pusan National University, Pusan 609-735, Korea
2 Agency for Defense Development, Taejon 305-600, Korea
3 Department of Aerospace Engineering, Seoul National University, Seoul 151-742, Korea
A computational study was carried out to analyze a high-pressure combustion in scram accelerator. Fluid dynamic modeling was based on RANS equations for reactive flows, which were solved in a fully coupled manner using a fully implicit-upwind TVD scheme. For the accurate simulation of high-pressure combustion in ram accelerator, 9-species, 25-step fully detailed reaction mechanism was incorporated with the existing CFD code previously used for the ram accelerator studies. The mechanism is based on GRI-Mech. 2.11 that includes pressure-dependent reaction rate formulations indispensable for the correct prediction of induction time in high-pressure environment. A real gas equation of state was also included to account for molecular interactions and real gas effects of high-pressure gases. The present combustion modeling is compared with previous 8-step and 19-step mechanisms with ideal gas assumption. The result shows that mixture ignition characteristics are very sensitive to the combustion mechanisms, and different mechanism results in different reactive flow-field characteristics that have a significant relevance to the operation mode and the performance of scram accelerator.
© EDP Sciences 2000