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Introduction. Deflagration: A Combustion wave moving at subsonic speed.Detonation: A Combustion Wave moving at supersonic speed.Deflagration-to-Detonation Transition (DDT): Transition of the combustion mode from deflagration to detonation.DDT distance: The distance traveled by a deflagration wave before it turns into a detonation front. (Also called: Run-up length, Pre-detonation distance) .
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