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Studies of jet fuel thermal stability under conditions of rapid heating

机译：快速加热条件下喷气燃料热稳定性的研究

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摘要

In advanced flight vehicles,the fuel will encounter a range of temperatures along the flow path.The flowing fuel may degrade by thermal-oxidative chemistry at relatively low temperatures or by pyrolytic chemistry at higher temperatures.The evolution of the fuel temperature distribution and,consequently,the procession of degradation reactions within the fuel depend on the involved fluid dynamics and the imposed heat flux.There has been recent interest in the study of hydrocarbon fuels which,under conditions of turbulent flow,are subjected to conditions of rapid heating (1).In this paper,experiments are performed in which flowing jet fuel is rapidly heated in order to study the influence of the heating rate on surface deposition and dissolved oxygen consumption.Unfortunately with the metal tubes that are used in surface deposition experiments involving jet fuel,it is difficult to directly measure the internal fuel temperature and dissolved oxygen concentration along the heated length.Computational fluid dynamics simulations permit the study of the flow within heated tubes commonly used in experiments.To better understand the influence of the convective flow and the effects of relatively rapid heating rates on fuel degradation,numerical simulations of the involved fluid dynamics and heat transfer are performed in the present study.
机译：在高级飞行器中，燃料会沿流路遇到一定范围的温度。流动的燃料可能会在相对较低的温度下因热氧化化学作用或在较高温度下因热解化学作用而降解。燃料温度分布的演变以及因此的变化，燃料中的降解反应的进程取决于所涉及的流体动力学和施加的热通量。近年来，人们对研究在湍流条件下经受快速加热条件的碳氢燃料的研究兴趣很大（1） 。本文进行了一些实验，其中快速加热流动的喷气燃料，以研究加热速率对表面沉积和溶解氧消耗的影响。不幸的是，在涉及喷气燃料的表面沉积实验中使用的金属管是很难直接测量沿加热长度的内部燃料温度和溶解氧浓度。常规的流体动力学模拟可以研究实验中常用的加热管内的流动。为了更好地了解对流流动的影响以及相对较快的加热速率对燃料降解的影响，对涉及的流体动力学和传热进行了数值模拟。在本研究中进行。

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