지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 명노신
- 발행연도
- 2022
- 저작권
- 경상대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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Most existing IR suppression techniques are difficult to apply to an already established aircraft system and cannot be applied in an active way. As an alternative solution, the present study explores an active technique for shielding IR signals by injecting particles into the engine exhaust plume.
A Eulerian-Lagrangian-based discrete phase method was used to calculate a multiphase flow composed of exhaust gas and injected particles. In order to analyze the characteristics of thermal flow and particle distribution under flight conditions, a cruise condition of Mach number 0.7 at an altitude of 20,000 ft was considered. Water droplets and carbon particles with diameters of 5 and 10 μm were considered, and placed randomly within the particle layer. To analyze the shielding effect according to particle size, material type, and distribution pattern, the transmittance of IR electromagnetic waves of 3~5 μm wavelength was analyzed using a full Maxwell multi-level fast multipole method.
When the total mass was kept the same, 5 μm water droplets in wavelength bands below 3.5~3.7 μm, and 10 μm water droplets or 5 μm carbon particles in wavelength bands above 3.5~3.7 μm were more effective for shielding. If the single layer transmittance information obtained in the present study is extended to actual particle layers of several tens of centimeters, it is expected that the shielding effect will be significantly higher.
A Eulerian-Lagrangian-based discrete phase method was used to calculate a multiphase flow composed of exhaust gas and injected particles. In order to analyze the characteristics of thermal flow and particle distribution under flight conditions, a cruise condition of Mach number 0.7 at an altitude of 20,000 ft was considered. Water droplets and carbon particles with diameters of 5 and 10 μm were considered, and placed randomly within the particle layer. To analyze the shielding effect according to particle size, material type, and distribution pattern, the transmittance of IR electromagnetic waves of 3~5 μm wavelength was analyzed using a full Maxwell multi-level fast multipole method.
When the total mass was kept the same, 5 μm water droplets in wavelength bands below 3.5~3.7 μm, and 10 μm water droplets or 5 μm carbon particles in wavelength bands above 3.5~3.7 μm were more effective for shielding. If the single layer transmittance information obtained in the present study is extended to actual particle layers of several tens of centimeters, it is expected that the shielding effect will be significantly higher.
목차
I. 서 론 11. 연구 배경 12. 연구 목적 6II. 본 론 81. 이론적 기법 81) Compressible Navier-Stokes-Fourier Equation 82) 다상 유동 해석 기법 93) 전자기파 해석 기법 112. 입자 분사에 따른 배기가스 열유동장 분석 141) 노즐 및 분사 장치 형상 모델링 142) 유동 해석 및 분사 조건 153) 분사 조건에 따른 열유동장 해석 결과 174) 비행 조건에 따른 열유동장 해석 결과 213. 입자 분사에 따른 배기가스 적외선 신호 분석 231) 입자에 의한 전자기파 산란 특성 분석 232) 차폐 효과를 고려한 배기가스 IR 신호 특성 분석 35III. 결 론 39참고문헌 41
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