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Dynamics of ethylene autoignition and Deflagration-to-Detonation Transition(DDT) in a one-dimensional shock tube are numerically investigated using askeletal chemistry including 10 species and 10 reactions. Different combustionmodes are investigated through considering various premixed gas equivalenceratios (0.2 to 2.0) and incident shock wave Mach numbers (1.8 to 3.2). Fourignition and DDT modes are observed from the studied cases, i.e., no ignition,deflagration combustion, detonation after reflected shock and deflagrationbehind the incident shock. For detonation development behind the reflectedshock, three autoignition hot spots are formed. The first one occurs at thewall surface after the re-compression of the reflected shock and contactsurface, which further develops to a reaction shock because of the explosion inthe explosion regime. The other two are off the wall, respectively caused bythe reflected shock rarefaction wave interaction and reaction induction in thecompressed mixture. The last hot spot develops to a reaction wave and coupleswith the reflected shock after a DDT process, which eventually leads todetonation combustion. For deflagration development behind the reflected shock,the wave interactions, wall surface autoignition hot spot as well as itsinduction of reaction shock are qualitatively similar to the mode of detonationafter incident shock reflection, before the reflected shock rarefaction wavecollision point. However, only one hot spot is induced after the collision,which also develops to a reaction wave but cannot catch up with the reflectedshock. For deflagration behind the incident shock, deflagration combustion isinduced by the incident shock compression whereas detonation occurs after theshock reflection.

Effects of wave interaction on ignition and deflagration-to-detonation transition in ethylene/air mixtures behind a reflected shock