915 Behavior of Combustion Wave induced by Propagation of Shock Wave into Premixed Gas of Hydrogen and Oxygen(2)

Experiments were conducted in order to investigate a behavior of combustion wave when a shock wave was propagated into a combustible premixed gas of hydrogen and oxygen. A phenomenon occurring in the premixed gas might be classified into four types, i.e. (a) the shock wave just transmitted into the gas without causing ignition in case for low-Mach number of the shock wave, (b) the gas was ignited behind the shock wave and a deflagration wave was propagated following the shock wave, (c) the deflagration wave transited to a detonation wave behind the shock wave, (d) a detonation wave was directly initiated just behind incident shock wave of high-Mach number. In this study, a shock wave produced by a detonation-driven shock tube was transmitted into a hydrogen-oxygen premixed gas varied with an equivalence ratio φ, initial pressure p_1 and Mach number of the shock wave Msi using same tube of 20 mm in diameter. As a result, the phenomena observed in the gas was classified using a cell-size λ for steady detonation wave, since the cell-size was inversely proportional to a chemical reaction rate of the gas.