The effect of thermochemical kinetics modeling on hypersonic flow over a double-cone geometry is investigated. The double-cone is simulated using three different approaches based on the Park model: nonequilibrium flow, equilibrium flow, and frozen flow for air at four different freestream conditions. The thermochemical model effects on the flowfield and surface properties are specific areas of interest. The resulting aerothermodynamic loads are compared to experiments performed in the CUBRC LENS-XX facility and indicate that thermochemistry modeling plays an important role in determining surface properties. The results indicate that the specific thermochemistry model used to describe hypersonic flow over a double-cone significantly affects surface properties for both CUBRC facilities, especially at high enthalpies. A comparison of Park and Modified Marrone–Treanor thermochemistry models is also made, and it is concluded that the models produce similar surface properties, due to the freestream density, and fail to reproduce experimental results. Consistent overprediction of the pressure drag and heating rate indicates there is some unknown fundamental difference between the experiments and the simulations, thus limiting the usefulness of these double-cone experiments for validation of thermochemistry models.

研究了热化学动力学模型对双锥几何结构上高超声速流动的影响。双锥体使用三种基于 Park 模型的不同方法进行模拟：非平衡流、平衡流和空气在四种不同自由流条件下的冻结流。热化学模型对流场和表面特性的影响是特定的关注领域。将产生的空气热力学载荷与在 CUBRC LENS-XX 设施中进行的实验进行比较，表明热化学模型在确定表面特性方面起着重要作用。结果表明，用于描述双锥上高超音速流动的特定热化学模型显着影响了两个 CUBRC 设施的表面特性，尤其是在高焓下。还对 Park 和 Modified Marrone-Treanor 热化学模型进行了比较，得出的结论是，由于自由流密度，这些模型产生了相似的表面特性，并且无法重现实验结果。压力阻力和加热速率的一致高估表明实验和模拟之间存在一些未知的根本差异，从而限制了这些双锥实验对热化学模型验证的有用性。