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
- 조대환
- 발행연도
- 2015
- 저작권
- 목포해양대학교 논문은 저작권에 의해 보호받습니다.
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In this study, the flow characteristics at the front and the rear side of the HVAC diffuser installed in AHU were studied.
Set up the rectangular prism of which height is H at diffuser inlet duct, the flow control methods were considered using PIV and CFD numerical analysis.
To ensure and groping the way of flow recovery at the heat exchanger wall, investigated the flow characteristics and velocity distributions at the inlet and outlet side of diffuser by changing the aspect ratio of the prism.
Experimental results are as follows:
By the effect of Karman vortex occurred at the rear side of prism, the flow field around the boundary layer are disturbed, and as a result, increase the ability against flow separation phenomena.
In the case of installing prism, a fluid are distributed up and down
directions of prism, and the recirculation regions are decreased. In the case of AR(aspect ratio)=1:1, the position (y/H=0.1)of 90% velocity recovery rate moved to 27% upstream.
At Re=8.8×10 and AR=1:1, the velocity recovery rate and degree of uniformity are higher, and decreased as increase the Reynolds number. Average flow velocity was increased by 37% compared with non-prism condition, and the degree of uniformity was 96.7% at x/H =1.5.
In the case of rising aspect ratio to the width direction, velocity gradient at the recirculation region was decreased. And aspect ratio is over 1:3, a fluid showed the similar tendency with installing the guide damper by the effect of divided fluid flow.
In the case of rising aspect ratio to the longitudinal, obstacle effect was appear at the rear side of prism, and average velocity was decreased over 10% as increase the aspect ratio by multiple.
Set up the rectangular prism of which height is H at diffuser inlet duct, the flow control methods were considered using PIV and CFD numerical analysis.
To ensure and groping the way of flow recovery at the heat exchanger wall, investigated the flow characteristics and velocity distributions at the inlet and outlet side of diffuser by changing the aspect ratio of the prism.
Experimental results are as follows:
By the effect of Karman vortex occurred at the rear side of prism, the flow field around the boundary layer are disturbed, and as a result, increase the ability against flow separation phenomena.
In the case of installing prism, a fluid are distributed up and down
directions of prism, and the recirculation regions are decreased. In the case of AR(aspect ratio)=1:1, the position (y/H=0.1)of 90% velocity recovery rate moved to 27% upstream.
At Re=8.8×10 and AR=1:1, the velocity recovery rate and degree of uniformity are higher, and decreased as increase the Reynolds number. Average flow velocity was increased by 37% compared with non-prism condition, and the degree of uniformity was 96.7% at x/H =1.5.
In the case of rising aspect ratio to the width direction, velocity gradient at the recirculation region was decreased. And aspect ratio is over 1:3, a fluid showed the similar tendency with installing the guide damper by the effect of divided fluid flow.
In the case of rising aspect ratio to the longitudinal, obstacle effect was appear at the rear side of prism, and average velocity was decreased over 10% as increase the aspect ratio by multiple.
목차
제1장 서론 11.1 연구배경 11.2 관련연구 51.3 연구범위와 목적 7제2장 이론적 고찰 92.1 디퓨저이론 92.2 후류 간섭 132.3 성능평가지표 152.4 입자영상 유속계 17제3장 PIV 실험 및 수치해석 기법 203.1 PIV 실험 203.1.1 PIV 실험장치 203.1.2 PIV 실험조건 243.1.3 PIV 계측방법 273.2 수치해석 313.2.1 기본 방정식 313.2.2 지배 방정식 333.2.3 난류모델 353.2.4 이산화기법 373.3 격자구성 및 수치해석 조건 403.3.1 격자구성 403.3.2 수치해석 조건 43제4장 실험결과 및 고찰 464.1 유동가시화 464.2 시간평균속도 분포 524.3 종횡비의 영향 56제5장 수치해석 결과 및 고찰 685.1 속도 및 유량분배 특성 685.2 유동균일도 76제6장 결 론 80참고문헌 82
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