Hydraulic jump and energy dissipation downstream stepped weir

Al-Talib, Azza N.; Mohammed, Ahmed Y.; Hayawi, Hana A.

doi:10.1016/j.flowmeasinst.2019.101616

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…The equation demonstrates that the jump efficiency is a dimensionless function solely reliant on the Froude number of the flow after the hydraulic jump. Similarly, the relative loss, denoted as 1 -E 2 /E 1 , is also a dimensionless function based on the Froude number [19], [20].…”

Section: Efficiencymentioning

confidence: 99%

Double sill stilling basin to enhance energy dissipation for a strong hydraulic jump with a high Froude number

Erryanto,

Dermawan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Roller Compacted Concrete (RCC) is a new and viable construction material for concrete gravity dams. It is gaining popularity due to its low cost and fast deployment. The design of a stilling basin, part of a dam that controls the hydraulic jump and dissipates energy, is crucial. One of the important considerations is the Froude number at the spillway toe (F1), which determines the type of hydraulic jump that will occur. An energy dissipator is also required to prevent scour caused by the change in flow conditions from supercritical to subcritical. Double sills installed downstream of the steep chute way channel can be used as an energy dissipator. This study uses hydraulic modeling to evaluate the flow energy reduction and subcritical flow conditions in a stilling basin with double sills. The investigation is expected to provide better information on hydraulic jump control.

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Section: Efficiencymentioning

confidence: 99%

Double sill stilling basin to enhance energy dissipation for a strong hydraulic jump with a high Froude number

Erryanto,

Dermawan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The results show that the pre-jump Froude number, the relative height of the weir, the ratio of the widths of the pre-jump and post-jump sections, and other factors all affect the conjugate depth ratio, relative energy loss, and efficiency of energy dissipation. Talib et al (2019) [15] performed another study on the power generation characteristics of the hydraulic jump downstream of a stepped weir and used it as energy dissipation to reduce the additional power dissipated on the stepped weir. Three various heights, slopes, as well as modified step numbers for 27 stepped weir models, were evaluated.…”

Section: Figure 1 World Net Electricity Generation Ieo Reference Case...mentioning

confidence: 99%

Estimate of Power Output from Hydraulic Jumps Generated Downstream from Barrages

El-Baradei,

El-Abd,

Hazem

2024

J. Hum. Earth Future

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Hydropower is an affordable, sustainable way to generate electricity. Research on hydraulic jumps focuses only on determining head loss across the jump, but there are no studies on generating power from the jump. This research aims to utilize energy dissipated from hydraulic jumps for power-generating purposes and further use this power in real-life applications. This research simulates ideal hydraulic conditions to identify the most stable hydraulic jumps, which will be used to generate power. The Seriakos barrage in Egypt was taken as a case study to simulate energy dissipated/power generated from hydraulic jumps generated downstream. This power is then used to simulate lighting up some streets in Egypt according to Egyptian power consumption standards. An Excel spreadsheet was used to mathematically model generated hydraulic jump types, energy dissipated, and generated power. The study found that submerged flow generates maximum power values from hydraulic jumps as opposed to free flow. The research concluded that energy produced by hydraulic jumps at the Seriakos barrage could light up 78 street light bulbs. Although this is a small amount of power, Egypt could meet a significant portion of its energy needs if hydraulic jumps from all its hydraulic structures were utilized for power generation. Doi: 10.28991/HEF-2024-05-01-06 Full Text: PDF

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“…However, for the q 25 and q 100 discharge, the depth ratio of water rises with the Froude number increase. According to ABDEL AAL et al [2018] andALTALIB et al [2019], the number of steps (N) and the discharge per unit width (q) can affect the depth ratio.…”

Section: Effect Of Discharge and Breakers' Number On The Hydraulic Ju...mentioning

confidence: 99%

Journal of Water and Land Development

Azmeri,

Basri,

Yulianur

et al. 2021

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Energy dissipator functions to dissipate the river-flow energy to avoid longitudinal damage to the downstream river morphology. An optimal energy dissipator planning is essential to fulfilling safe specifications regarding flow behavior. This study aims to determine the variation of energy dissipators and evaluate its effect on the hydraulic jump and energy dissipation. For this purpose, a physical model was carried out on the existing weir condition (two steps). It was also carried out on four stepped-weir variations, i.e., three-step, three-step with additional baffle blocks at the end sills, four-step, and six-step. Dimensional analysis was employed to correlate the different parameters that affect the studied phenomenon. The study shows a three-step jump shows a significantly higher Lj/y 1 ratio, which is an advantage to hydraulic jumps' compaction. The comparison of energy dissipation in all weir variations shows that the three-stepped weir has wasted more energy than other types. The energy dissipation increase of the three-step type is 20.41% higher than the existing type's energy dissipation and much higher than other types. The dimensions of the energy dissipation basin are the ratio of the width and height of the stairs (l/h) of the three-step type (2.50). Therefore, this type is more optimal to reduce the cavitation risk, which damages the river structure and downstream area.

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Hydraulic jump and energy dissipation downstream stepped weir

Cited by 19 publications

References 9 publications

Double sill stilling basin to enhance energy dissipation for a strong hydraulic jump with a high Froude number

Double sill stilling basin to enhance energy dissipation for a strong hydraulic jump with a high Froude number

Estimate of Power Output from Hydraulic Jumps Generated Downstream from Barrages

Journal of Water and Land Development

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