원문정보
초록
영어
Through this study, velocity distribution characteristics of exit section and downstream straight length of square sectional 180° and 90° curved ducts were numerically analyzed with RSM (Reynolds Stress Model) by changing various flow parameters such as air velocity, surface roughness and hydraulic diameter etc. As a result of it, the maximum velocity profiles according to air velocity in 180° and 90° curved ducts were indicated at Y/D=0.8 and X/D=0.7 region. Also, the efficient measuring location in bended duct downstream was able to suggest when the most stable straight duct length in flow deviations were indicated at L/D=30 and L/D=10 region, and the standard deviation characteristics according to hydraulic diameter were mostly indicated at L/D=15∼30 and L/D=10 region considering minimum deviations in the same velocity condition.
목차
1. 서론
2. 이론해석
2.1 해석모델
2.2 지배방정식
2.3. 수치해석
2.4 난류모델의 타당성 검증
3. 결과 및 고찰
3.1 각도형상에 따른 속도분포 특성
3.2 입구속도 변화에 따른 속도분포 특성
3.3 표면거칠기 변화에 따른 속도분포 특성
3.4 곡관하류의 직관거리에 따른 표준편차분포
3.5 수력직경에 따른 직관부의 표준편차분포
4. 결론
References