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Ignition investigation by paraboloid focusing shock wave


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Ignition investigation by paraboloid focusing shock wave
Sheng Yingxia12Fan Baochun1Gui Mingyue1Dong Gang1
1.National Key Laboratory of Transient Physics,NUST,Nanjing 210094,China; (2.College of Urban Construction and Safety Engineering,Nanjing University of Technology, Nanjing 210009,China
paraboloid focusing shock waves ignition acetylene air
To study the mechanism of ignition in the fire explosion process induced by physical rupture and improve the ignition technology in supersonic combustion or detonation combustion,the acetylene/air combustible gas mixture is ignited in a 59 mm×59 mm rectangular cross section shock tube induced by paraboloid focusing shock waves.The high-speed photography technology is applied to observe the process of the incident shock wave focusing and reflecting by the paraboloid.Shaded pictures of reflected shock wave focusing and schlieren photographs of focusing ignition are obtained.The results show that the combustible mixture of acetylene/air can be ignited by the focusing shock wave(Ma=2.1),if the acetylene/air blended near the theoretical chemical stoichiometric ratio.The flame is generated at the gas dynamics focus formed by the paraboloid reflection and focusing,and the spread speed of the flame is the fastest along the paraboloid.


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Last Update: 2013-03-25