Propagation of a flame-driven shock wave at a velocity at or above the speed of sound in the unreacted medium as measured at the flame front. The wave is sustained by chemical energy released by shock compression and ignition of the unreacted medium. The flame front is coupled in time and space with the shock front, and there is no pressure increase significantly ahead of the shock-flame front. Propagation velocities in the range 1000–3500 m/s may be observed depending on the gas mixture, initial temperature and pressure, and type of detonation.
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