| Citation: | ZHOU Kai, LI Xudong, HU Zongmin, et al. Comparative study of thermal-chemical reaction models on simulation of hypervelocity flow[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(6): 1173-1181. doi: 10.13700/j.bh.1001-5965.2016.0474(in Chinese)
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Hypervelocity flow is the high-speed high-temperature flow environment that space vehicles or capsules face when they reenter the atmospheric layer. An expansion tube is one of the few qualified test facilities on the ground to simulate it. Numerical simulation is presented as a powerful assistant tool for hypervelocity flow diagnosis and analysis. Thermal-chemical reaction model plays an important role in simulation of hypervelocity flow. Thermal-chemical reaction models of 5 and 11 species based on thermal equilibrium condition, and 5 species based on thermal nonequilibrium condition are applied on the numerical technique. A comparative study of the influence on the computation for double-wedge test model employed with the above three models has been conducted to evaluate their applicability. The results indicate that 5 species chemical model can meet the test gas simulation requirement, but 11 species chemical model must be taken into account for the acceleration gas. However, if the thermal nonequilibrium phenomenon is strong in the flow, we must employ the thermal-chemical nonequilibrium model to guarantee the reliability of the numerical simulation.
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