LOCALIZED GAS DETONATION FAILURE IN FRICTION-INFLUENCED LOW Ea MIXTURES

چکیده مقاله

This study investigates the behavior of a detonation wave in a non-ideal environment, where deviations from ideal conditions arise due to external influences such as friction. The detonation is simulated using the one-dimensional Euler equations with a momentum source term representing frictional effects. A single-step Arrhenius law is employed to model chemical kinetics. The governing equations are solved using the piecewise parabolic method, while the shock front conservative tracking algorithm is applied to achieve adaptive mesh refinement at the detonation front. A parametric study is conducted to evaluate the influence of friction on detonation dynamics in mixtures characterized by low activation energy, specifically below the critical stability threshold of 22 required for sustaining a completely regular detonation structure. The failure mechanism of the detonation wave is shown to depend on the activation energy level. Results indicate that detonation failure is primarily driven by a reduction in pressure and chemical reaction rate, with negligible influence from the unburnt packet mechanism, regardless of the activation energy. Across all tested activation energy levels, detonation failure occurs when friction exceeds a critical threshold, independent of the specific mixture composition.