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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 金羲東
- 발행연도
- 2018
- 저작권
- 안동대학교 논문은 저작권에 의해 보호받습니다.
이용수2
이 논문의 연구 히스토리 (6)
2017
BOS 기법을 이용한 초음속 제트 유동의 가시화
이재혁
,
Guang Zhang
,
김태호
외 1명
한국가시화정보학회 학술발표대회 논문집
2017.11
학술대회자료
PIV 및 컬러 쉴리렌 기법을 이용한 초음속 제트 관측
이재혁
,
Zhang Guang
,
김태호
외 1명
한국추진공학회 학술대회논문집
2017.05
학술대회자료
C-D 노즐로부터 발생하는 초음속 제트 유동에 관한 가시화
이재혁
,
Zhang Guang
,
김태호
외 1명
한국가시화정보학회 학술발표대회 논문집
2017.05
학술대회자료
초음속 제트 유동의 정량적 가시화
이재혁
,
Guang Zhang
,
김희동
한국가시화정보학회지
2017.04
학술저널
- 이 논문의 후속연구가 궁금하신가요?
- 연관 학술논문 또는 학술발표를 통해 보다 발전된 연구결과를 확인하실 수 있습니다.
- 이 논문의 연구 히스토리 확인하기
초록· 키워드
오류제보하기
Sonic and supersonic jets are of interest from the point of view of fundamental fluid mechanics as well as practical applications. After chocking, the normal shocks are happened inside of the supersonic nozzle divergent section. While increasing NPR, the normal shocks are moved to at the nozzle exit and go out with more pressure. The jets are considered with the relationship of different nozzle exit pressure(Pe) and back pressure(Pb) as correct expansion, under expanded jet, over expanded jet. According to previous works, the under expanded jets are specified by its barrel shock structure, Mach disk location, jet boundary configuration, velocity decay, and supersonic length, etc., which are determined by the NPRs as well as shape of the nozzle. However, these studies are only for numerical study and there are not many real experimental studies which are contained quantitative information.
In the present study, Particle Image Velocimetry (PIV) was employed to specify the jet flow field, and a color Schlieren optical method was applied to visualize the same jets. Recently, PIV technique can be possible in compressible flow or high speed conditions also by developing of camera and many visualization devices. A good comparison of the jet size from the Schlieren images with the PIV is obtained. These images are clearly showed the major features of the under-expanded jet and over-expanded jet.The hysteresis phenomena frequently occurs in the wide variety of fluid flow systems of industrial and engineering applications. Recently, the research has been substantially carried out to understand the physics of flow hysteresis. Hysteresis mainly rises during the change of pressure ratios and it influences the performance the supersonic wind tunnel. However, investigations on the hysteresis phenomena which occurred particularly inside supersonic wind tunnel are rarely studied.
In the present study, Particle Image Velocimetry (PIV) was employed to specify the jet flow field, and a color Schlieren optical method was applied to visualize the same jets. Recently, PIV technique can be possible in compressible flow or high speed conditions also by developing of camera and many visualization devices. A good comparison of the jet size from the Schlieren images with the PIV is obtained. These images are clearly showed the major features of the under-expanded jet and over-expanded jet.The hysteresis phenomena frequently occurs in the wide variety of fluid flow systems of industrial and engineering applications. Recently, the research has been substantially carried out to understand the physics of flow hysteresis. Hysteresis mainly rises during the change of pressure ratios and it influences the performance the supersonic wind tunnel. However, investigations on the hysteresis phenomena which occurred particularly inside supersonic wind tunnel are rarely studied.
목차
ABSTRACT .................................................................................................................. vi목 차 ........................................................................................................................... viii그림 및 표 목록 ....................................................................................................... x기 호 설 명 .............................................................................................................. xii제 1 장 서 론 .................................................................................................... 11.1 연구배경 .............................................................................................................. 11.2 종래의 연구 ........................................................................................................ 61.3 연구목표 .............................................................................................................. 7제 2 장 실험장비 및 방법 ....................................................................... 82.1 실험모델 ............................................................................................................ 82.2 실험방법 ............................................................................................................ 102.2.1 흑백 쉴리렌 실험방법 ............................................................................ 102.2.2 컬러 쉴리렌 실험방법 ............................................................................ 122.2.3 BOS 실험방법 .......................................................................................... 152.2.4 PIV 실험방법 .......................................................................................... 18제 3 장 실험결과 ........................................................................................... 213.1 쉴리렌 결과 ...................................................................................................... 213.2 컬러 쉴리렌 결과 ............................................................................................. 223.3 BOS 결과 ........................................................................................................... 243.4 PIV 결과 ............................................................................................................ 27제 4 장 결 론 .................................................................................................. 32참고문헌 ..................................................................................................................... 34석사과정 중 발표논문 .......................................................................................... 36감사의 글 .................................................................................................................... 38
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