날아가는 섬광탄이 연료탱크 수평핀에 미치는 복사열전달 연구

Abstract

ABSTRACT In this paper, the effect of unsteady radiation on the horizontal fin of an external fuel tank by flame of a flying flare was analysed to see the temperature increase of the fin and the thermal impact on the fin. Radiation between two surfaces was calculated using the concept of radiation resistance of surface and space including radiation, irradiation and shape factor for two flying trajectories of a flare, maximum temperature of 2200 K, emissivity of 0.95, flying velocity of 30 m/s, and thermal surface area of 0.01 m 2 . The result shows that the temperature increase of the fin is 0.236 K, and the thermal effect on the fin is ignorable. And it was found that temperature is increased a little because small amount of heat energy can be radiated due to the short exposure time to the heat source.Key Words : Flare(섬광탄), External Fuel Tank(외부 연료탱크), Radiation Heat Transfer(복사열전달), Diffuse Gray(확산회체), Shape Factor(형상계수), Heat Flow(열류), Radiant Intensity(복사강도) 1. 서 론 대부분의 군용기는 적의 레이더 및 열추적 탐지를 회피하기 위해 Chaff/Flare를 장착, 운용하고 있다. 공군의 F-00 항공기도 Chaff/Flare를 운용(Fig. 1)하고 있으나 중앙 파일론에 150갤런 용량의 외부연료탱크를 장