Experimental investigation on the characteristics of hydraulic jump in expanding channels with a water jet injection system

Document Type : Research Paper

Authors

1 Department of Hydraulic Structures, College of Water and Environmental Engineering, Shahid Chamran University of Ahvaz,Iran.

2 Department of Civil, Environmental and Architectural Engineering, University of L'Aquila, Via G. Gronchi, 18, 67100 L'Aquila, Italy

Abstract

The high flow velocity downstream of weirs and gates can cause the destruction of erosive beds in rivers or even non-erosive channels. To reduce the flow's kinetic energy, structures are needed to consume this energy. Expansion basins are often used downstream of structures such as weirs, gates, and chutes to increase energy dissipation in hydraulic jumps. Various methods are used to stabilize asymmetric hydraulic jumps in abrupt expanding channels. In this study, the interaction of multiple submerged water jet injection systems with S-type hydraulic jump for stabilizing and stabilizing the hydraulic jump was investigated. The different configurations of the jet system were tested with Froude numbers 7.4, 8.7, and 9.5, and finally, three optimal configurations were selected as configurations 1, 2, and 3. In order to investigate the performance of the jet injection system under other hydraulic boundary conditions, flow velocities downstream of the jet system were measured for three optimal configurations with different depths of the tailwater. Comparison of the results of using a water jet injection system with S-type hydraulic jump showed that the energy and momentum correction coefficients in all different configurations were significantly reduced. The highest relative energy loss was observed in configuration 3, equal to 68.42%. The results showed a good performance of the jet injection system in stabilizing the asymmetric hydraulic jump S and reducing the length of the stilling basin.

Keywords


  1. Chow, V(1959)Open-channel hydraulics, McGraw-Hill, New York.
  2. Tharp, EL(1966)Modification of the hydraulic jump by submerged jets.
  3. Rajaratnam, N(1964)The forced hydraulic jumpWater Power, 16(2), 14-19.‏
  4. Basco, DR., & Adams, JR(1971)Drag forces on baffle blocks in hydraulic jumpsJournal of the Hydraulics Division. 2035-2023,(12)97.
  5. Rajaratnam, N., & Murahari, V(1971)A contribution to forced hydraulic jumpsJournal of Hydraulic Research, 9(2), 217-240.‏
  6. Peterka, AJ(1974)Hydraulic design of stilling basins and energy dissipatorsUnited States Department of the Interior, Bureau of Reclamation.‏
  7. Ohtsu, I., Yasuda, Y., & Yamanaka, Y(1991)Drag on vertical sill of forced jumpJournal of Hydraulic Research, 29(1), 29-47.‏
  8. Hager, WH(1992)Energy dissipators and hydraulic jump, Kluwer Academic, Dordrecht, Netherlands.
  9. Thompson, PL., & Kilgore, RT(2006)Hydraulic Design of Energy Dissipators for Culverts and Channels: Hydraulic Engineering Circular Number 14 (NoFHWA-NHI-06-086)National Highway Institute (US).‏
  10. Habibzadeh, A., Wu, S., Ade, F., Rajaratnam, N., & Loewen, MR(2011)Exploratory study of submerged hydraulic jumps with blocksJournal of Hydraulic Engineering, 137(6), 706-710.‏
  11. Abdelhaleem, FSF(2013)Effect of semi-circular baffle blocks on local scour downstream clear-overfall weirsAin Shams Engineering Journal, 4(4), 675-684.‏
  12. Aal, GMA., Sobeah, M., Helal, E., & El-Fooly, M(2018)Improving energy dissipation on stepped spillways using breakersAin Shams Engineering Journal, 9(4), 1887-1896.‏
  13. Herbrand, K(1973)The spatial hydraulic jumpJournal of Hydraulic Research, 11(3), 205-218.
  14. Scorzini, AR., Di Bacco, M., & Leopardi, M(2016)Experimental investigation on a system of crossbeams as energy dissipator in abruptly expanding channelsJournal of Hydraulic Engineering, 142(2), 06015018.
  15. Bremen, R., and Hager, WH(1993)T-jump in abruptly expanding channelJHydraulRes., 31(1), 61–78.
  16. Varol, F., Cevik, E., & Yuksel, Y(2009)The effect of water jet on the hydraulic jumpIn Thirteenth International Water Technology Conference, IWTC (Vol13, pp895-910).
  17. Wali, UG(2013)Kinetic energy and momentum correction coefficients for a small irrigation channelInternational Journal of Emerging Technology and Advanced Engineering, 3(9), 1-8.
  18. Khalili Shayan, H ., &Farhoudi, J(2013)Theoretical criterion for stability of free hydraulic jump on adverse stilling basinsJournal of Hydraulic Structures, 1(2), 53-66.‏
  19. Helal, E., Abdelhaleem, FS., & Elshenawy, WA(2020)Numerical Assessment of the Performance of Bed Water Jets in Submerged Hydraulic JumpsJournal of Irrigation and Drainage Engineering, 146(7), 04020014.‏
  20. Hajialigol, S., Ahadiyan, J., Sajjadi, M., Rita Scorzini, A., Di Bacco, M., & Shafai Bejestan, M(2021)Cross-Beam Dissipators in Abruptly Expanding Channels: Experimental Analysis of Flow PatternsJournal of Irrigation and Drainage Engineering, 147(11), 06021012.‏
  21. Sharoonizadeh S, Ahadiyan J, Scorzini AR, Di Bacco M, Sajjadi M, Moghadam MFExperimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic JumpWater2021; 13(18):2572https://doi.org/10.3390/w13182572.
  22. Mohanty, PK., Dash, SS., Khatua, KK., & Patra, KC(2012)Energy and momentum coef´Čücients for Wide compound channelsRiver Basin Management VII, 172, 87.
  23. Seckin, G., Ardiclioglu, M., Cagatay, H., Cobaner, M., & Yurtal, R(2009)Experimental investigation of kinetic energy and momentum correction coefficients in open channelsScientific Research and Essays, 4(5), 473-478.
  24. Hamidifar, H., Omid, MH., & Keshavarzi, A(2016)Kinetic energy and momentum correction coefficients in straight compound channels with vegetated floodplainJournal of Hydrology, 537, 10-17.
  25. Keshavarzi, A., & Hamidifar, H(2018)Kinetic energy and momentum correction coefficients in compound open channelsNatural Hazards, 92(3), 1859-1869.
  26. Alhamid, AA(2004)S-jump characteristics on sloping basinsJournal of Hydraulic research, 42(6), 657-662.‏
  27. Neisi, K., & Shafai Bejestan, M(2013)Characteristics of S-jump on roughened bed stilling basinJournal of Water Sciences Research, 5(2), 25-34.‏