| Title |
An Experimental Study for Reduction of Energy losses at Surcharged Four-way Combining Square Manhole |
| Authors |
김정수(Kim, Jung Soo) ; 김채린(Kim, Chae Rin) ; 윤세의(Yoon, Sei Eui) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.2.0311 |
| Keywords |
4방향 합류맨홀;인버트;과부하흐름;배수시설 Four-way combining manhole;Invert;Surcharged flow;Drainage facility |
| Abstract |
Energy loss at manholes under surcharged flow is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze the flow characteristics to reduce the energy loss in the surcharged four-way combining manhole. In this study, hydraulic experimental apparatus was constructed considering the results of the present survey. Square manholes and pipe diameters were reduced to 1/5 by applying sewer facility standards. Numerical simulations were carried out with the Fluent 6.3 model to derive the invert condition which can reduce the energy loss in the surcharged four-way combining square manhole. The hydraulic experiments were carried out according to the various conditions of the lateral flow rate($Q_{lat}/Q_{out}$), discharge of outflow pipe (2.0, 3.0, 4.0, 4.8 l/sec), and invert shape (rectangle and square open conduit type). The crossed invert was not found to improve the drainage capacity of the surcharged four-way rectangular combining manhole. However, the improved rectangle open conduit type invert and square open conduit type invert were analyzed to improve the drainage capacity by reducing the head loss coefficients by about 8% and 28%, respectively. Therefore, in order to increase the drainage capacity of urban facilities, it is possible to install and use the improved invert proposed in this study. |