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在钝体高焓流动中,热化学非平衡效应使膨胀区壁面压力显著低于冻结流动,相关研究表明,再压缩效应可以消除上述差异.为详细分析此问题,数值求解了Euler方程,化学反应源项采用有限速率模型并考虑了5个组分,17个基元反应.结果表明,随着再压缩角的增大,热化学非平衡效应引起锥面压力先降后增非单调变化,这是由于再压缩流场中放热复合反应与吸热分解反应的强度变化决定的,其宏观表现为比热比的空间不均衡分布.
In the blunt body high enthalpy flow, the thermochemical non-equilibrium effect makes the wall surface pressure in the expansion zone significantly lower than that in the frozen flow, and the relevant researches show that the recompression effect can eliminate the above differences.In order to analyze this problem in detail, Euler equation, chemical reaction source Term finite element model with five components and 17 elementary reactions was considered.The results show that with the increase of recompression angle, the thermomechanical unbalanced effect causes the cone pressure to decrease first and then increases non-monotonically, which is Due to the exothermic recombination flow field recombination reaction and endothermic decomposition reaction intensity changes, the macroscopic performance of the specific heat ratio of the spatial distribution of uneven.