Research status of active cooling of endothermic hydrocarbon fueled scramjet engine
Research status of active cooling of endothermic hydrocarbon fueled scramjet engine
复制标题
DOI：
10.1177/0954410012463642
复制
发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
W. Ning;Pan Yu;Zhou Jin
中科院分区：
文献类型：
--
作者：
W. Ning;Pan Yu;Zhou Jin
吸热型碳氢燃料主动冷却是一种非常有效的超燃冲压发动机热防护方法。从冷却能力和热沉测量、热与催化裂化、结焦抑制、换热特性、喷射、混合、点火和燃烧性能五个方面综述了吸热型碳氢燃料超燃冲压发动机主动冷却的研究现状，并对吸热型碳氢燃料超燃冲压发动机主动冷却的进一步研究提出了建议。吸热型碳氢燃料的总热沉足以满足超燃冲压发动机冷却的需要，因为它是在裂化反应中产生额外的化学热沉，而催化裂化具有较低的裂化起始温度、较高的转化率和较好的选择性。对于减少结焦，通常通过消除燃料中的溶解氧，减少结焦前述物质的量，以及对金属表面进行一些特殊处理来实现。吸热型碳氢燃料的换热有两个方面的强化。第一个是临界点附近参数的变化，第二个是裂化反应的结果。裂解产物具有较好的喷射、混合、点火和燃烧性能，这对超燃冲压发动机来说尤其具有吸引力，因为有效的混合和稳定的点火燃烧一直是困难的。
The active cooling with endothermic hydrocarbon fuel is proved to be a very effective approach for scramjet thermal protection. This article has summarized the research status of active cooling of endothermic hydrocarbon fueled scramjet engine from the following five aspects, cooling capacity and heat sink measurement, thermal and catalytic cracking, coking suppression, heat transfer characteristics, and injection, mixing, ignition, and combustion performance, and suggestions on the further study of active cooling of endothermic hydrocarbon fueled scramjets are put forward. The total heat sink of endothermic hydrocarbon fuel is found to be sufficient for scramjet cooling as the additional chemical heat sink is generated from cracking reactions, and catalytic cracking is proved to be better, because of its low cracking starting temperature, high conversion percentage, and good selectivity. As for coking mitigation, approaches are usually made from eliminating the oxygen dissolved in the fuel, reducing the amount of coking-foregoing substances, and doing some special treatments on the metal surface. The heat transfer of endothermic hydrocarbon fuels presents two enhancements. The first one is related to the variation of parameters near the critical point while the second one is a result of cracking reactions. The cracked products are proved to have better performance of injection, mixing, ignition, and combustion, and this is especially attractive for scramjets as effective mixing and stable ignition and combustion has always been difficult.