Explosive-driven shock wave and vortex ring interaction with a propane flame

Experiments were performed to analyze the interaction of an explosively driven shock wave and a propane flame. A 30 g explosive charge was detonated at one end of a 3-m-long, 0.6-m-diameter shock tube to produce a shock wave which propagated into the atmosphere. A propane flame source was positioned at various locations outside of the shock tube to investigate the effect of different strength shock waves. High-speed retroreflective shadowgraph imag­ ing visualized the shock wave motion and flame response, while a synchronized color camera imaged the flame directly. The explosively driven shock tube was shown to produce a repeatable shock wave and vortex ring. Digital streak images show the shock wave and vortex ring propagation and expansion. The shadowgrams show that the shock wave extinguishes the propane flame by pushing it off of the fuel Communicated by A. Higgins. B M. J. Hargather [email protected] P. M. Giannuzzi [email protected] G. C. Doig [email protected] 1 Energetic Materials Research and Testing Center (EMRTC), New Mexico Tech, 801 Leroy Place, Socorro, New Mexico 87801, USA 2 Mechanical Engineering Department and EMRTC, New Mexico Tech, 801 Leroy Place, Socorro, New Mexico 87801, USA 3 Aerospace Engineering Department, California Polytechnic State University, 1 Grand Ave, San Luis Obispo, California 93407, USA 4 School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia source. Even a weak shock wave was found to be capable of extinguishing the flame.