碳氢燃料流动换热与裂解反应的建模及仿真

Modelling and Simulation of Flow With Heat Transfer and Cracking Reaction for Hydrocarbon

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。

It is an important subject for thermal protection of hypersonic applications to investigate the release characteristics of chemical heat sink for hydrocarbon,which depends on not only the chemical properties of hydrocarbon but also the conditions for flow with heat transfer,such as temperature,residence time,etc.Taking into account both the effect of flow with heat transfer on cracking reaction and the effect of composition variations caused by cracking reaction on flow process, a one-dimensional unsteady model has been developed to investigate the coupling characteristics between flow with heat transfer and cracking reaction for hydrocarbon.By simulating the typical operating conditions with different temperatures,different operating pressures and different mass flow fluxes,the basic laws of coupling characteristics between flow with heat transfer and cracking reaction for hydrocarbon are revealed preliminarily.The agreements of simulation results with experimental data of published literatures show that the developed model can be used to assist experiments to investigate the cracking process of hydrocarbon,and to guide the design for cooling system of hypersonic flight vehicles.