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碳氢燃料的化学热沉的释放特性不仅与燃料自身的化学性质有关,还受燃料温度和驻留时间等流动换热因素的影响,是高超声速热防护技术中的重要研究课题。考虑流动换热对裂解反应的影响及裂解反应所引起的组分变化对流动换热过程的影响,本文提出了一个一维非稳态的模型来研究碳氢燃料的裂解反应与流动换热过程的耦合特性.并对不同的温度、工作压力和质量流率等典型工况进行了模拟,初步揭示了碳氢燃料的裂解反应和流动换热过程耦合的基本规律。计算结果与公开文献中实验数据的一致性表明了该计算模型可辅助于实验来研究碳氢燃料的裂解反应过程,并指导高超声速飞行器冷却系统的设计。
The release characteristics of chemical heat sinks of hydrocarbon fuels are not only related to the chemical nature of the fuel itself, but also influenced by the flow heat transfer factors such as fuel temperature and residence time, which are important research topics in the hyperthermia thermal protection technology. Considering the influence of the flow heat transfer on the cracking reaction and the influence of the composition change caused by the cracking reaction on the flow heat transfer process, a one-dimensional unsteady model is proposed to study the cracking reaction and the heat transfer process of the hydrocarbon fuel And the typical operating conditions such as temperature, working pressure and mass flow rate were simulated and the basic rules of the coupling reaction between hydrocarbon cracking reaction and flow heat transfer process were revealed. The calculated results are in agreement with the experimental data in the open literature, which shows that the calculation model can assist experiments to study the cracking reaction of hydrocarbon fuels and guide the design of the hypersonic vehicle cooling system.