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首页> 外文期刊>Aerospace science and technology >Performance assessment of a closed-recuperative-Brayton-cycle based integrated system for power generation and engine cooling of hypersonic vehicle
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Performance assessment of a closed-recuperative-Brayton-cycle based integrated system for power generation and engine cooling of hypersonic vehicle

机译：基于封闭式布雷顿循环的高超声速车辆发电和发动机冷却集成系统的性能评估

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Hypersonic vehicle is a next generation aircraft/spacecraft with broad applications, but its development is limited by the high-power electricity supply and thermal protection of engine. This study presents an integrated system based on Closed-Recuperative-Brayton-Cycle (CRBC) for power generation and engine cooling, in which combustion heat dissipation is transferred by liquid metal and partly converted into electric power. An integrated system model which consists of a scramjet combustor, wall cooling channels and a CRBC power generator, is established to evaluate system performance. Results indicate that the integrated system can meet the demands of both high power generation and engine thermal protection for hypersonic vehicles. There is an optimal temperature of liquid metal at heater inlet for power generation performance. The peak electric power increases with fuel equivalence ratio. Liquid sodium exhibits excellent heat transfer performance for engine cooling, the mass flowrate of which becomes greater with smaller fuel equivalence ratio. Besides, the influence of power generation on propulsion is not significant. The specific impulse and specific thrust have maximum decrease of about 2% compared to the cases without heat dissipation. This research provides a novel scheme to achieve power generation and engine thermal protection for hypersonic vehicles. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：高超音速飞行器是具有广泛应用的下一代飞机/航天器，但其发展受到大功率电力供应和发动机热保护的限制。这项研究提出了一种基于闭式布雷顿循环（CRBC）的发电和发动机冷却集成系统，其中燃烧散热通过液态金属传递，并部分转化为电能。建立了由超燃冲压燃烧器，壁式冷却通道和CRBC发电机组成的集成系统模型，以评估系统性能。结果表明，该集成系统可以同时满足高超声速车辆的高发电量和发动机热保护要求。加热器入口处液态金属的最佳温度可提高发电性能。峰值电力随着燃料当量比而增加。液态钠在发动机冷却方面表现出出色的传热性能，其质量流量随着燃料当量比的减小而变大。此外，发电对推进的影响不大。与没有散热的情况相比，比冲和比推力最大降低约2％。这项研究为实现高超声速车辆的发电和发动机热保护提供了一种新颖的方案。 （C）2019 Elsevier Masson SAS。版权所有。

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