극초음속 비행체의 비행속도가 증가함에 따라 액체 탄화수소 연료의 열분해를 통한 재생 냉각 기술이 주목받고 있

다. 그러나 액체 탄화수소 연료의 열분해 과정에서 탄소 침적물인 코크가 발생한다는 문제점이 있다. 코크 침적물은 비

행체에 많은 문제점을 발생시키므로 소량의 첨가제를 투입하여 코크 발생을 억제하는 방법이 도입되었다. 본 연구에

서는 흐름형 열분해 반응기에서 열안정성 연료를 대상으로 산화방지제와 금속 비활성화제를 첨가하여 연료의 흡열 특

성과 코크 저감 특성 변화를 분석하였다. 최적 농도의 산화방지제와 금속 비활성화제를 첨가한 결과 첨가제를 사용하

지 않은 경우에 비해 흡열량은 6.31% 증가하였고, 코크 발생량은 75% 감소하였다.

As the flight speed of hypersonic aircraft increases, regenerative cooling system using pyrolysis of liquid

hydrocarbon fuels is being discussed. However, the decomposition of liquid hydrocarbon fuels results in the coke

formation, a carbon deposit, which can cause serious problems in the flow channels. To address this, a method of adding

small amounts of additives to reduce coke formation has been proposed. In this study, we compared the endothermic

characteristics and coke reduction of thermally stable fuel by adding antioxidants and metal deactivators in a flow type

reactor. The results showed that use of optimal additives increased the heat sink 6.31%, coke formation reduced up to

75% compared to when no additives were used.

Endothermic fuel, Coke reduction, Additives, Anti-oxidants, Metal deactivators

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