| Variation of Supersonic Aircraft Skin Temperature under Different Mach number and Structure |
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Jong Hyun Cha, Taehwan Kim, Ji-Yeul Bae, Taeil Kim, Daeyoon Jung, Hyung Hee Cho |
1Department of Mechanical Engineering, Yonsei University
2The 3rd Research and Development Institute, Agency for Defense Development |
| 비행마하수와 형상에 따른 초음속 항공기 표면온도 변화 |
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차종현, 김태환, 배지열, 김태일, 정대윤, 조형희 |
1연세대학교 기계공학과
2국방과학연구소 제3기술연구본부 |
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| Abstract |
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Stealth technology of combat aircraft is most significant capability in recent air battlefield. As the detector of IR missiles is being developed, IR stealth capability which is evaluated by IR signature level become more important than it was in previous generation. Among IR signature of aircraft from various sources, aerodynamic heating dominates in long-wavelength IR spectrum of $8{sim}12{mu}m$. Skin temperature change by aerodynamic heating which is derived by effects of Mach number and structure. The 4th and 5th generation aircraft are selected for calculation of the skin temperature, and its height and velocity in numerical conditions are 10,000 m and Ma 0.9~1.9 respectively. Aircraft skin temperature is calculated by computing convection of fluid and conduction, convection and radiation of surface. As the aircraft accelerates to higher Mach number, maximum skin temperature increases more rapidly than average temperature and temperature distribution changes in more sharp, interactive ways. The 4th generation aircraft whose shape is more complex than that of the 5th generation aircraft have complicated temperature distribution. On the other hand, the 5th generation aircraft whose shape is relatively simple shows plain temperature distribution and lower skin temperature in terms of both average and maximum value. |
| Key Words:
IR Stealth, Aerodynamic Heating, Skin Temperature |
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