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The present work reports new experiments of detonation diffraction in a 2Dchannel configuration in stoichiometric mixtures of ethylene, ethane, andmethane with oxygen as oxidizer. The flow field details are obtained usinghigh-speed schlieren near the critical conditions of diffraction. The criticalinitial pressure for successful diffraction is reported for the ethylene,ethane and methane mixtures. The flow field details revealed that the lateralportion of the wave results in a zone of quenched ignition. The dynamics of thelaterally diffracting shock front are found in good agreement with the recentmodel developed by Radulescu et al. (Physics of Fluids 2021). The modelprovides noticeable improvement over the local models using Whitham'scharacteristic rule and Wescott, Bdzil and Stewart's model for weakly curvedreactive shocks. These models provide a link between the critical channelheight and the critical wave curvature. The critical channel heights and globalcurvatures are found in very good agreement with the critical curvaturesmeasured independently by Xiao and Radulescu (Combust. Flame 2020) inquasi-steady experiments in exponential horns for three mixtures tested.Furthermore, critical curvature data obtained by others in the literature wasfound to provide a good prediction of critical diffraction in 2D. Thesefindings suggest that the critical diffraction of unstable detonations may bewell predicted by a model based on the maximum curvature of the detonationfront, where the latter is to be measured experimentally and account for therole of the cellular structure in the burning mechanism. This finding providessupport to the view that models for unstable detonations at a meso-scale largerthan the cell size, i.e., hydrodynamic average models, are meaningful.

Critical diffraction of irregular structure detonations and their predictability from experimentally obtained D-K data