연속 맨홀에서의 손실계수 산정

• 영문명: An Estimation of Head Loss Coefficients at Continuous Circular Manhole
• 발행기관: 한국방재학회
• 저자명: 윤영노 김정수 한정석 윤세의 Yoon, Young-Noh Kim, Jung-Soo Han, Chyung-Such Yoon, Sei-Eui
• 간행물 정보: 『3. 한국방재학회 학술대회논문집』2008년, 731~734쪽, 전체 4쪽
• 주제분류: 공학 > 기타공학
• 파일형태: PDF
• 발행일자: 2008.02.28

영문 초록

Urban sewer systems are designed to operate in open-channel flow regime and energy loss at circular manholes are usually not significant. However, the energy loss at manholes, often exceeding the friction loss of pipes under surcharge flow, is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze the head loss associated with manholes, especially in surcharge flow. Hydraulic experimental apparatus with two circular manholes was installed for this study. The range of the experimental discharges were from $1.0\ell/sec$ to $4.4\ell/sec$. Head loss coefficient was maximum because of strong oscillation of water surface when the range of manhole depth ratios$(h_m/D_{in})$ were from 1,2 to 1.25. The average head loss coefficients for upstream manhole and downstream manhole were 0.58 and 0.23 respectively. Head loss at upstream manhole is nearly 2.5 times more than one at downstream manhole.

키워드

Head loss coefficient Circular manhole Urban sewer system Surcharge flow