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Characteristics and Development Trends of Heat-Resistant Composites for Flight Propulsion System

비행체 추진기관용 내열 복합재의 특성 및 개발 동향

  • Received : 2019.06.20
  • Accepted : 2019.08.06
  • Published : 2019.09.01

Abstract

In order to limit the temperature rise of the structure to a certain level or less while maintaining the aerodynamic shape of solid rocket nozzle by effectively blocking a large amount of heat introduced by the combustion gas of high temperature and high pressure, the heat-resistant materials such as C/C composite having excellent ablation resistance are applied to a position in contact with the combustion gas, and the heat-insulating materials having a low thermal diffusivity are applied to the backside thereof. SiC/SiC composite, which has excellent oxidation resistance, is applied to gas turbine engines and contributes to increase engine performance due to light weight and heat-resistant improvement. Scramjet, flying at hypersonic speed, has been studying the development of C/SiC structures using the endothermic fuel as a coolant because the intake air temperature is very high. In this paper, characteristics, application examples, and development trends of various heat-resistant composites used in solid rocket nozzles, gas turbine engines, and ramjet/scramjet propulsions were discussed.

고온, 고압의 연소가스에 의해 유입되는 많은 열을 효과적으로 차단하여 고체 로켓 노즐의 공력형상을 최대한 유지하면서 구조물의 온도 상승을 일정수준 이하로 제한하기 위해 연소가스와 접하는 위치에 내삭마성이 우수한 C/C 복합재 등의 내열재를, 그 배면에는 열확산계수가 낮은 단열재를 적용한다. 내산화성이 우수한 SiC/SiC 복합재는 가스터빈 엔진에 적용되고 있으며, 경량화와 내열성 향상으로 인해 엔진 성능 증가에 기여하고 있다. 극초음속으로 비행하는 스크램제트는 흡입 공기 온도가 매우 높아서 흡열 연료를 냉각제로 사용하는 C/SiC 구조물 개발 연구가 수행되고 있다. 본 논문에서는 고체 로켓 노즐, 가스터빈 엔진 및 램제트/스크램제트 추진기관에 사용되는 다양한 내열 복합재의 특성, 적용사례 및 개발 동향을 고찰하였다.

Keywords

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