Under specific flying conditions, interaction between turbulence and chemical nonequilibrium will occur on hypersonic vehicle surfaces; however, related research is limited. Choosing the flow state after the leading shock of a cone and utilizing two gas models, i.e. the calorically perfect gas and the chemical reaction gas, we conduct a Direct Numerical Simulation (DNS) study to analyze the effects of chemical nonequilibrium on the turbulence statistics and fluctuations, and investigate the scaling law. The results show that the endothermic dissociated reaction is dominant in the boundary layer, significantly reducing the average temperature and temperature fluctuation. However, chemical nonequilibrium only have a small influence on the average streamwise velocity, velocity fluctuation and Reynold stress. In the log-region, the Extended Self-Similarity(ESS) of the fluctuations is still consistent with the scaling law.
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