Detonation properties of gases at elevated initial pressures

The detonation properties of several gaseous systems at elevated initial pressures were examined theoretically. The systems investigated include: hydrogen (H2), methane (CH4), ethylene (C 2H4). ethane(C2H6), and propane(C3H8). Chemkin Real Gas,acomputer programcapable ofcalculating real-gas thermodynamic properties and chemical kinetic reaction rates, wasexpanded to utilize the ideal gas, van der Waals, Redlich-Kwong,Soave, and Peng-Robinsonequationsofstate todescribe the P-V-T behaviorofthe gaseous mixtures used in this investigation. The Chapman-Jouguet (CJ) theory of detonation was used to examine the variation of the detonation properties as a function of the initial pressure and temperature. The CJ numerical calculations are shown to be relativelv insensitive lo eauation of state deoendenl constants (critical properties) estimated for the radical species present in the detonation products. The real-gas equations of state are shown to accurately predict the variation oithe experimentally measured detonation velocities with initial pressure. © 1995 OPA (Overseas Publishers Association) Amsterdam B.V. Published under license by Gordon and Breach Science Publishers SA Printed in Malaysia.