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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study of fluid flows and heat transfer of aviation kerosene with consideration of fuel pyrolysis and surface coking at supercritical pressures
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Numerical study of fluid flows and heat transfer of aviation kerosene with consideration of fuel pyrolysis and surface coking at supercritical pressures

机译：考虑超临界压力下燃料热解和表面焦化的航空煤油流动与传热数值研究

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摘要

A computational fluid dynamics (CFD) model has been developed and applied for numerical studies of fluid flows and heat transfer of the aviation kerosene RP-3 with consideration of both fuel pyrolysis and surface coking in a circular cooling tube at a supercritical pressure of 5 MPa. A detailed pyrolytic chemical reaction mechanism, which contains 18 species and 24 elementary reactions, and a modified kinetic model for considering the surface coking reactions are incorporated in the CFD model. The effects of the surface heat flux and inlet flow velocity on the complex physicochemical process of supercritical-pressure turbulent heat transfer of RP-3 are examined. Results reveal that the endothermic fuel pyrolysis improves the convective heat transfer by two means: providing extra heat absorption through the endothermic chemical reactions and thus decreasing the bulk fluid temperature, and increasing the flow velocity and consequently increasing the convective heat transfer coefficient. The equivalent surface heat flux from the endothermic chemical reactions can contribute to around 70% of the total surface heat flux at the high fluid temperature region. As the aviation kerosene RP-3 is thermally decomposed, the main surface coking precursors, propene and aromatics, are produced. As a result, carbon deposition accumulates on the interior surface of the cooling tube, particularly at a low inlet flow velocity and/or a high surface heat flux.
机译：已经开发了计算流体动力学（CFD）模型，并将其用于航空煤油RP-3的流体流动和传热的数值研究，同时考虑了在5 MPa超临界压力下圆形冷却管中的燃料热解和表面焦化。 CFD模型中包含了详细的热解化学反应机理，该机理包含18个物种和24个基本反应，以及考虑表面焦化反应的改进动力学模型。研究了表面热通量和入口流速对RP-3超临界压力湍流传热的复杂理化过程的影响。结果表明，吸热燃料热解通过两种方式改善了对流传热：通过吸热化学反应提供了额外的热量吸收，从而降低了总体流体温度；增加了流速，从而提高了对流传热系数。在较高的流体温度区域，吸热化学反应产生的等效表面热通量约占总表面热通量的70％。随着航空煤油RP-3的热分解，产生了主表面焦化的前体丙烯和芳烃。结果，碳沉积特别是在低入口流速和/或高表面热通量下积聚在冷却管的内表面上。

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