Flow Characteristics in Vertical Shaft Spillway with Varied Inlet Shapes and Submergence States

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Intisar A. Hady
https://orcid.org/0009-0001-1091-2391
Ahmed Y. Mohammed
https://orcid.org/0000-0002-2274-9202

Abstract

A spillway is an essential hydraulic structure that discharges excessive water, especially during floods from upstream to downstream of the dam. A shaft spillway is sometimes used when a limited area is available. This study used four physical models of vertical shaft spillways with different edge shapes to study the flow characteristics. Each case was based on three tailwater heights: free, semi, and submerged. The results showed that two flow cases at the entrance depended on the water depth upstream; the weir flow happened at low discharge when the ratio of water depth to shaft diameter H/D was less than 0.5, and orifice flow when the proportion H/D was greater than 0.5. In the weir flow regime for submerged conditions, the water depth upstream (H) decreased by (6%) more than free flow. When replacing inlet shapes, the upstream depth (H) decreased by (40%) in the weir flow and (13%) in the orifice flow. In weir flow, the discharge coefficient values decreased with crest length, and larger values were obtained at the submerged state. While in orifice flow, Cd values increased with crest length, and higher values occurred at semi-submerged. Spillway discharge increased with entrance edge shape length in submerged condition.

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References

Nohani E. An Experimental Study on the Effect of Vortex Breakers on Discharge Coefficient for the Shaft Spillways With Sharp Edge and Wide Edge. Journal of Civil Engineering Urban 2014; 4(5): 546–549.

Khaleel FI, Mohammed AY. The Effect of Dual Water Jet on Discharge Coefficient of Vertical Spillway. Al-Rafidain Engineering Journal 2021; 26(2): 292–299. DOI: https://doi.org/10.33899/rengj.2021.130443.1104

Bagheri A, Bajestan MS, Jahromi HM, Kashkooli H, Sedghee H. Hydraulic Evaluation of the Flow Over Polyhedral Morning Glory Spillways. World Applied Science Journal 2010; 9(7): 712–717.

Nohani E, Naghshine H. Experimental Evaluation of the Anti-Vortex Plates Angle on Discharge Coefficient for the Shaft Spillway. International Journal of Agriculture 2013; 3(2): 246.

Hajipour G. Experimental Investigation of the Effect of Angular Vortex Blades on Discharge Angular Vortex Blades Against Nilofri Overflow Discharge. MSc Thesis. School of Water Sciences, Shahid Chamran University of Ahvaz, 2014.

Enjilzadeh MR, Nohani E. Numerical Modeling of Flow Field in Morning Glory Spillways and Determining Rating Curve at Different Flow Rates. Civil Engineering Journal 2016; 2(9): 448–457. DOI: https://doi.org/10.28991/cej-2016-00000048

Lashkar B, Sheikhi Y. Introduce of Crown Wheel Spillway and Study of its Discharge Coefficient under Free Flow Regime. Journal of Irrigation Science Engineering 2017; 40(2):209–221.

Kashkaki Z, Banejad H, Heydari M, Olyaie E. Experimental Study of Hydraulic Flow of Circular Piano-Key Inlet in Shaft Spillways. Journal Rehabil Civil Engineering 2019; 7(3): 96–102.

Sabeti P, Karami, H, Sarkardeh H. Analysis of the Impact of Effective Length of Morning Glory Spillway on its Performance (Numerical Study). Instrumentation Mesure Metrologie 2019; 18(2): 211–221. DOI: https://doi.org/10.18280/i2m.180217

Brakeni A, Petrovic GA. An Experimental Study of Shaft Spillway with a Polygonal Section. UPB Scientific Bulletin, Series D: Mechanical Engineering 2020; 82(2): 255–268.

Maedeh K, Kabiri SA. Effects of Modern Marguerite-Shaped Inlets on Hydraulic Characteristics of Swirling Flow in Shaft Spillways. Water Science Engineering 2021; 14(3): 246–256. DOI: https://doi.org/10.1016/j.wse.2021.08.005

Chitsazan M, Ghafouri HR. Optimization of Anti-Vortex Blades Geometry in Morning Glory Spillways by Numerical simulation. SSRN Electronic Journal 2022; 5(1): 1-27 DOI: https://doi.org/10.2139/ssrn.4121268

Bengtson HH. Sharp-Crested Weirs for Open Channel Flow Measurement. Continuing Education and Development 2011; 2(C02-022): 1-25.

Irzooki RH, Najem AS. Study the Affecting Factors on Free Overfall Flow and Bed Roughness in Semi-Circular Channels by Artificial Neural Network Neural Network. Tikrit Journal of Engineering Sciences 2022; 29(4): 69–78. DOI: https://doi.org/10.25130/tjes.29.4.8

Luqman LS, Kawa ZA. Advancements in Flow Behavior Investigation and Performance Enhancement of Morning Glory Spillways: a Systematic Review of Numerical and Physical Models. Iranian Journal of Science and Technology- Transactions of Civil Engineering 2023; 47(5):1–35.

Jalil SA, Hussein BS, Sarhan SA. Visualization of Elbow Flow Performance as Shaft Spillway. Ain Shams Engineering Journal 2020; 11 (4): 865–873. DOI: https://doi.org/10.1016/j.asej.2020.03.017

Gupta RS. Hydrology and Hydraulic Systems. Waveland Press, Inc; 2016.

Anwar HO, Weller JA, Amphlett MB. Similarity of Free-Vortex at Horizontal Intake. Journal of Hydraulic Research 1978; 16(2): 95–105. DOI: https://doi.org/10.1080/00221687809499623

Karim RA, Mohammad JR. SPH Open Boundary Simulation of Free-Surface Flow Over Ogee-Crested Spillway. Tikrit Journal of Engineering Sciences 2021; 28(2): 137–151. DOI: https://doi.org/10.25130/tjes.28.2.11

Machiels O, Pirotton M, Pierre A, Dewals B Erpicum S. Experimental Parametric Study and Design of Piano Key Weirs. Journal of Hydraulic Research 2015; 53(4): 543–545. DOI: https://doi.org/10.1080/00221686.2015.1054323

Mussalli YG. A Study of Flow Conditions in Shaft Spillways. Institute of technology. Ph.d Thesis In the School of Civil Engineering: 1970.

Zayed M. Lecture Notes (Flow Through Orifices). 2020; 1-12.

Christodoulou G, Mavrommatis A, Papathanassiadis T. Experimental Study on the Effect of Piers and Boundary Proximity on the Discharge Capacity of a Morning Glory Spillway, Proceedings of the 1st IAHR Europe Congress (Edinburgh, 2010).

Aydin MC, Ulu AE Numerical Investigation of Labyrinth-Shaft Spillway. Applied Water Science 2023; 13(4): 89-99. DOI: https://doi.org/10.1007/s13201-023-01896-4

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