PIV를 이용한 다수 원주 주위 유동장 해석 = Flow Field Analysis around Multi-Cylinders Using Particle Image Velocimetry

다국어 초록 (Multilingual Abstract)

Many researches were done on the flow field analysis around two adjacent cylinders. A lot of applications can be found in many fields, such as, mechanical engineering, aerospace engineering, wind engineering, and ocean engineering. This research aims at the ocean engineering applications. Most of the ocean structures consist of cylindrical bodies. Thus the interaction between them are very important phenomenon to be analyzed.
Zdravkovich(1985) published a paper concerning the interaction effects between two adjacent cylinders, in side by side and tandem arrangements. His research was done in the wind tunnel. He presented the sketch of the classificaiton of flow regimes. In this study the velocity vector fields were obtained by using the particle image velocimetry. The details of the velocity field information were obtained. The experiment was done in the circulating water channel. The flow fields were visualized by using laser beam sheet first.
Then the video camera recorded the flow fields. The results are transferred to the computer through image board. Noise reduction was done on the input frames of images. Then the particle identification were done by two frame cross correlation method. Finally, the flow field were obtained. Most of the results are in good agreements with those of Zdravkovich.
This research proved that PIV could be a very useful and efficient tool in the flow field analysis.

목차 (Table of Contents)

• 목차 = Ⅰ
• 1. 서론 = 7
• 2. 회류수조 = 9
• 2.1 제원 및 특성 = 9
• 2.2 실험분야 = 12
• 2.3 초기의 회류수조 및 국내외 회류수조 설치현황 = 15
• 2.4 회류수조의 개선점 = 18
• 3. 가시화 실험 = 19
• 3.1 모델설명 및 실험조건 = 19
• 3.2 가시화 = 21
• 3.3 정량적인 가시화 기법 = 22
• 3.4 PIV의 역사적 배경 = 24
• 4. PIV 계측기법을 이용한 화상처리 = 26
• 4.1 PIV의 처리과정 = 26
• 4.2 화상처리 알고리즘 = 27
• 4.2.1 동일 입자 추적법 = 27
• 4.2.2 2프레임 입자추적법 = 28
• 4.4 화상 입출력과 저장장치 및 주변기기 = 29
• 4.4.1 화상입력장치 = 29
• 4.4.2 화상출력 및 저장장치와 주변기기 = 31
• 4.4.3 PIV의 문제점 및 개선방향 = 33
• 5. 측정결과 및 고찰 = 35
• 6. 결론 = 37
• 7. 참고문헌 = 38
• 8. 그림 = 41
• Abstract = 72