Experimental Study of Flow Field near Boundary Limited Intake Pipe

• Main Authors: Hsiao Wei-Te, 蕭維德
• Other Authors: Chan-Ji Lai
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/06102249412587736517

碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 94 === Detailed measurements of flows near a vertically flowing downward intake pipe with and without attached structures were presented. Emphasis is given to the effect of attached structures on the flow properties of different flow types. The experiments comprised measurements of rating curves for three flow types, including submerged type, critical submerged type and free-flow type, and detailed measurements of flow characteristics by using an acoustic Doppler velocimeter (ADV) for two flow types, including submerged type and free-flow type. It is shown that a significant reduction of the intake discharge by the attached structures for critical submerged type and free-flow type. The intake discharge is only dependent on the flow depth rather than the attached structures for the submerged type. With attached structures, the maximum velocity decreases by 20% compared to that without attached structures for free-flow type. The existence of large turbulent kinetic energy is present at upper left area. Flows of submerged type with the highest turbulent kinetic energy, compared to the other two flow types. With attached structures, the maximum turbulent kinetic energy decreases by 18.5% compared to that without attached structures for free-flow type.