180° 원형 혼합배관에서 위치별 속도분포 및 출구직관거리의 균일도 특성에 관한 연구
A Characteristic Study on Velocity Distribution by Location and Uniformity Index according to Exit Straight Length in a 180° Circular Mixed Pipe
In this study, velocity distribution characteristics by location and uniformity according to exit straight length in a 180° mixed pipes were numerically analyzed using RSM (Reynolds Stress Model) turbulent model by changing various flow parameters such as working fluids, inlet air velocity etc. As a result of it, the working fluids characteristics was highly indicated by the viscous force difference, the maximum velocity points according to main pipe’s inlet velocity were indicated when 90° sectional location was distributed at X/D=0.5~0.6 region and 180° sectional location was distributed at Y/D=0.5 region. And the flow characteristics according to branch pipe’s inlet velocity when 90° sectional location was distributed at X/D=0.4~0.6 region and 180° sectional location was distributed at Y/D=0.5 region. Based on the results that the most stable exit straight length in flow uniformity was indicated at L/D=25~30 region, 40D is suggested as the effective measurement distance in the straight pipe downstream curved pipe of mixed pipe.
목차
ABSTRACT 1. 서론 2. 수치해석 2.1 해석모델 2.2 수치해석 3. 결과 및 고찰 3.1 난류모델의 타당성 검증 3.2 작동유체에 따른 유동특성 3.3 주배관의 입구속도에 따른 유동특성 3.4 분기관의 입구속도에 따른 유동특성 3.5 곡관후류 직관부에서 유동속도의 균일도 특성 4. 결론 References