Explosive-driven shock wave and vortex ring interaction with a propane flame
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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 imaging 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 source. Even a weak shock wave was found to be capable of extinguishing the flame.
KeywordsShadowgraph Vortex ring Flame extinguishment Explosive shock wave Flow visualization
Funding was provided by the American Australian Association through a fellowship awarded to G.C. Doig, and UNSW Australia’s School of Mechanical and Manufacturing Engineering. We specially thank everyone at EMRTC who assisted with the testing, including N. Canafax, J. Peralta, and R. Weaver.
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