Abstract
In the present work, different modeling approaches are applied for the numerical simulation of high-enthalpy flows under the assumption of local thermochemical equilibrium. The first approach uses Srinivasan curve fits for estimating thermodynamic and transport properties of air at high temperatures, whereas the second approach estimates the properties by computing the equilibrium composition at a given density and temperature. A two-dimensional finite volume solver has been developed and is validated for shock-wave–boundary-layer interaction over a compression corner. Comparison of the flow characteristics obtained for calorically perfect gas and equilibrium air assumptions are presented for different test cases of inviscid and viscous hypersonic flows. The effect of the presence of argon on the properties of high-enthalpy flows is also studied. The increase in argon concentration from 0 to 20% is found to result in less than 10% increase in the peak temperature in the flowfield and heat flux at the wall.
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