서지주요정보
주위류를 갖는 난류확산 부상화염의 구조에 관한 실험적 연구 = Structural characteristics of lifted turbulent jet flames-coflowing air
서명 / 저자 주위류를 갖는 난류확산 부상화염의 구조에 관한 실험적 연구 = Structural characteristics of lifted turbulent jet flames-coflowing air / 박종원.
저자명 박종원 ; Park, Jong-Won
발행사항 [대전 : 한국과학기술원, 1994].
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소장정보

등록번호

8004239

소장위치/청구기호

학술문화관(문화관) 보존서고

DAE 94001

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도서상태

이용가능

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반납예정일

초록정보

This paper describes an experimental investigation on the time dependent lift-off behaviors of flames stabilized in axisymmetric turbulent jet. Reactive mie scattering techniques and high speed CCD photography were employed to investigate the behaviors of lifted flame and the flow field in the near-nozzle region of isothermal jets, attached flames, and lifted flames. Using the visualization techniques, it is observed that the lowest point of flame base of the lifted flame rotates around the periphery of the jet, and this rotating behavior is confirmed by measuring temperature fluctuation at the flame base of the lifted flame. Thus, this rotating behavior gives rise to azimuthal variations in the instant lift-off height. And it is found that there exist large scale vortex motion in the isothermal region of the lifted flame through visualizing various entrainment patterns of the ambient air into the jet fluid. These large scale helical vortex field of the jet in the relative near field of the nozzle bring about the rotating behavior of the lifted flame base. Also, in this study, it is suggested that the lobe size as well as the local jet diameter should be considered for determining the large scale mixing time in connection with the large scale structural mixing model of the lifted flame. Obviously, the physical mechanism of the lifted flame is yet sufficiently well understood, hence the present investigation was performed in order to provide more detailed understandings of the lift-off behaviors in relation to large scale turbulent structures.

서지기타정보

서지기타정보
청구기호 {DAE 94001
형태사항 x, 63 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jong-Won Park
지도교수의 한글표기 : 신현동
지도교수의 영문표기 : Hyun-Dong Shin
학위논문 학위논문(박사) - 한국과학기술원 : 항공우주공학과,
서지주기 참고문헌 : p. 60-63
주제 Jet nozzels.
Combustion engineering.
Flame visualization.
Vortex-motion.
확산 화염. --과학기술용어시소러스
난류. --과학기술용어시소러스
화상 처리. --과학기술용어시소러스
노즐. --과학기술용어시소러스
와류. --과학기술용어시소러스
Flame soraying.
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