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http://dx.doi.org/10.3741/JKWRA.2019.52.4.235

Experimental study of the air emission effect in the tangential and the multi-stage spiral inlet  

Seong, Hoje (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Rhee, Dong Sop (Multi Disaster Countermeasures Organization, Korea Institute of Civil Engineering and Building Technology)
Park, Inhwan (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of Korea Water Resources Association / v.52, no.4, 2019 , pp. 235-243 More about this Journal
Abstract
Recently, urban inundation was frequently occurred due to the intensive rainfall exceeding marginal capacity of the flood control facility. Furthermore, needs for the underground storage facilities to mitigate urban flood are increasing according to rapidly accelerating urbanization. Thus, in this study, drainage efficiency in drain tunnel connecting to underground storage was investigated from the air-core measurements in the drop shaft against two types of inlet structure. In case of the spiral inlet, the multi-stage structure is introduced at the bottom of the inlet to improve the vortex induction effect at low inflow discharge (multi-stage spiral inlet). The average cross-sectional area of the air-core in the multi-stage spiral inlet is 10% larger than the tangential inlet, and show the highly air emission effect and the highly inflow efficiency at the high inflow discharge. In case of the tangential inlets, the air emission effect decreased after exceeding the maximum inflow discharge, which is required to maintain the inherent performance of the tangential inlet. From the measurements, the empirical formula for the cross-sectional area of the air-core according to locations inside the drop shaft was proposed in order to provide the experimental data available for the inlet model used in experiments.
Keywords
Tangential inlet; Multi-stage spiral inlet; Air emission effect; Air-core;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Drainage Services Department (DSD). (2003). Stormwater drainage master plan study in northern Hong Kong Island - Executive summary. The Government of Hong Kong Special Administrative Region, Drainage Services Department, Hong Kong.
2 Drioli, C. (1947). "Su un particolare tipo di imbocco per pozzidi scarico." L'Energia Elettrica, Vol. 24, No. 10, pp. 447-452.
3 Giudice, G. D., and Gisonni, C. (2011). "Vortex dropshaft retrofitting: case of Naples city (Italy)." Journal of Hydraulic Research, Vol. 49, No. 6, pp. 804-808.   DOI
4 Hager, W. H. (1999). Wastewater Hydraulics. Springer, Berlin, New York, USA.
5 Jain, S. C. (1984). "Tangential vortex-inlet." Journal of Hydraulic Engineering, Vol. 110, No. 12, pp. 1683-1699.   DOI
6 Jain, S. C., and Ettema, R. (1987). Swirling flow problems at intakes-Vortex-flow intakes. IAHR Hydraulic Structures Design Manual, Balkema, Rotterdam, Netherlands, pp. 125-137.
7 Jevdjevich, V., and Levin, L. (1953). "Entrainment of air in flowing water and technical problems connected with It." Proceedings of the Minnesota International Hydraulics Convention, ASCE.
8 Mulligan, S., Casserly, J., and Sherlock, R. (2016). "Effects of geometry on strong free-surface vortices in subcritical approach flows." Journal of Hydraulic Engineering, Vol. 142, No. 11, 04016051.   DOI
9 Oh, J. O., Park, J. H., Park, C, K., and Jun, S. M. (2016). "Hydraulic stability evaluation for deep tunnel on continuous precipitation." Proceedings of Korea Water Resources Association, Daejeon, Korea, p. 99.
10 Park, S. W., Kim, H. J., and Rhee, D. S. (2016). "Hydraulic analysis of air-core patterns with various discharge and improving inlet part of the underground bypass model." Proceedings of Korea Water Resources Association, Daejeon, Korea, p. 369.
11 Quick, M. (1990). "Analysis of spiral vortex and vertical slot vortex drop shafts." Journal of Hydraulic Engineering, Vol. 116, No. 3, pp. 309-325.   DOI
12 Seong, H., Park, I., and Rhee, D. S. (2018). "Study of hydraulic characteristics with the shape of the intake of an underground inflow facility using hydraulic experiments", Journal of the Korean Society of Safety, Vol. 33, No. 4, pp. 119-126.   DOI
13 Szirtes, T. (2007). Applied dimensional analysis and modeling. Elsevier, Burlington, Massachusetts, USA.
14 Vischer, D. L., and Hager, W. H. (1995). Energy dissipators - Vortex drops. IAHR Hydraulic Structures Design Manual, Taylor & Francis, New York, USA, pp. 167-181.
15 Yu, D., and Lee, H. W. (2009). "Hydraulics of tangential vortex intake for urban drainage." Journal of Hydraulic Engineering, Vol. 135, No. 3, pp. 164-174.   DOI
16 Zhao, C. H., Zhu, D. Z., ASCE, M., Sun, S. K., and Liu, Z. P. (2006). "Experimental study of flow in a vortex drop shaft." Journal of Hydraulic Engineering, Vol. 132, No. 1, pp. 61-68.   DOI