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《Journal of Combustion Science and Technology》 1998-04
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The Thermodynamic Principle of Deflagration to Detonation Transition in a Duct

Yuan Shengxue Huang Zhicheng(Institute of Mechanics,Chinese Academy of Sciences)  
Two types of propagation mechanism of combustion are described first.One is propagated by combustion itself,another one is leaded by a moving ignition source which velocity is higher than the velocity of combustion propagation itself.Further more,it is pointed out that two kinds of unsteady combustion states and two kinds of detonation waves with different physical processes maybe exist in constant area duct.One of unsteady combustion states is come from deflagration acceleration over critical combustion velocity,and another one is come from combustion induced by shock waves.Then,the variation of the pressure and the entropy of unsteady combustion products in a 1 d constant area duct with one closed end versus combustion velocity (burning speed) is calculated with simplified method,in order to explore the thermodynamics reason of the flame acceleration and DDT (deflagration to detonation transition).The key of DDT is the transition of combustion propagation mechanisms and the event taken place in the transition is occurrence of combustion induced by shock waves.
【Fund】: 国家自然科学基金
【CateGory Index】: O643.21
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