Pressure Fluctuations on the Bed of Submerged Hydraulic Jump

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YOUSEFI K.; HEYDARI M.; BANEJAD H.; KARIMI M.

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Journal: WATER AND WASTEWATER Year:2019 | Volume:30 | Issue:4 (122) Page(s): 51-66

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Title

Pressure Fluctuations on the Bed of Submerged Hydraulic Jump

Author(s)

YOUSEFI K. | HEYDARI M. | BANEJAD H. | KARIMI M. | Issue Writer Certificate

Keywords

Submerged Hydraulic JumpQ1

Submergence RatioQ1

Pressure Fluctuation RateQ1

TransducerQ1

Abstract

The hydraulic jump has many usages in transport and treatment of water and wastewater. It may be considered macroscopically as a rapidly varied flow with strong vortices which generate macro turbulent fluctuations. The pressure fluctuation due to turbulence must be carefully considered in designation of hydraulic structures. In addition, cavitation, abrasion, and vibration due to the intense turbulence and pressure fluctuation may also contribute significantly to damage of a stilling basin. This paper discusses the characteristics of pressure fluctuation in Submerged Hydraulic Jump downstream of spillways and also the effects of Submergence Ratio on the pressure fluctuation. The experiments were carried out in a rectangular conduit (constituted from a30o spillway, 1. 8m in height and a horizontal flume with 0. 3m width and 3m length), for the Froude number of 7. 07 and also different ratios of submergence. Pressure data were recorded by pressure Transducers having sampling rate of 100 Hz. Experiments show that intensity of pressure fluctuation on the hydraulic jump bed is a function of Froude number a relative distance from basin’ s beginning and Submergence Ratio. Increasing Submergence Ratio decreases the coefficients of pressure fluctuation (C􀭮 􀬿 , C􀭮 􀬾 , C􀭮 􁇱 ), so that increasing the s. r. from 1 to 2, the C􀭮 􀱣 􀱗 􀱮 􁇱 decreases 89%. Also, the coefficient of standard deviation C􀭮 􁇱 and the extreme coefficients of pressure fluctuation C􀭮 􀬿 and C􀭮 􀬾 decrease by increasing the s. r., and maximum value of C􀭮 􀬿 and C􀭮 􀬾 occurs in the range of X/Y1  20. Therefore, this range has more importance from the structural designation view and the higher ratio of submergence supports the higher confidence for designation.

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APA: Copy

YOUSEFI, K., HEYDARI, M., BANEJAD, H., & KARIMI, M.. (2019). Pressure Fluctuations on the Bed of Submerged Hydraulic Jump. WATER AND WASTEWATER, 30(4 (122) ), 51-66. SID. https://sid.ir/paper/103706/en

Vancouver: Copy

YOUSEFI K., HEYDARI M., BANEJAD H., KARIMI M.. Pressure Fluctuations on the Bed of Submerged Hydraulic Jump. WATER AND WASTEWATER[Internet]. 2019;30(4 (122) ):51-66. Available from: https://sid.ir/paper/103706/en

IEEE: Copy

K. YOUSEFI, M. HEYDARI, H. BANEJAD, and M. KARIMI, “Pressure Fluctuations on the Bed of Submerged Hydraulic Jump,” WATER AND WASTEWATER, vol. 30, no. 4 (122) , pp. 51–66, 2019, [Online]. Available: https://sid.ir/paper/103706/en

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