Pressure Fluctuations in the Spatial Hydraulic Jump in Stilling Basins with Different Expansion Ratio

Hassanpour, Nasrin; Dalir, A Hosseinzadeh; Bayón, Arnau; Abdollahpour, Milad

doi:10.3390/w13010060

Cited by 13 publications

(14 citation statements)

References 25 publications

(40 reference statements)

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“…However, it can be observed that minimum values attained for C p at y/P = 2.87 (C p ~0.1) were a bit larger than those reported in the literature for hydraulic jumps [29,32,33], suggesting that, in spite of the quite uniform flow velocity field registered (Figure 7), bed pressure oscillations are not completely contained within the basin, mainly as a consequence of the reported water surface fluctuations in the area downstream from the device [34].…”

Section: Resultscontrasting

confidence: 59%

Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump

Sharoonizadeh

Ahadiyan

Scorzini

et al. 2021

Water

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This study presents an investigation on the use of submerged counterflow jets as a means for stabilizing the spatial hydraulic jump occurring in abruptly expanding channels. The characteristics of the flow downstream from the stilling basin and the main parameters influencing the effectiveness of the device in improving flow uniformity and reducing scouring potential are examined in laboratory tests, under several geometric configurations and hydraulic boundary conditions. The position within the stilling basin and the jet density (i.e., the number of orifices issuing the counterflow jets) were found to be important parameters influencing the performance of the device. Overall, the results indicate that this dissipation system has promising capabilities in forcing the transition from supercritical to subcritical flow, by significantly shortening the protection length needed to limit the phenomena of instability associated with spatial hydraulic jumps.

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Section: Resultscontrasting

confidence: 59%

Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump

Sharoonizadeh

Ahadiyan

Scorzini

et al. 2021

Water

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“…The characteristics of the fluctuating pressure of the standard stilling basin have been studied by several researchers. Toso and Bowers [5], Hassanpour et al [6] and Fiorotto and Rinaldo [7] studied the statistical structure of turbulent fluctuating pressure at the bottom of hydraulic jumps. Yan et al [8] deals with statistical analysis of pressure fluctuations at the bottom of spatial hydraulic jumps with abrupt lateral expansions.…”

Section: Review Of Literaturementioning

confidence: 99%

Pressure Fluctuations Characteristics of the Stilling Basin with a Negative Step

Huang

Diao

Jiang

et al. 2021

Advances in Transdisciplinary Engineering

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Fluctuating pressure is the main cause of the floor fatigue of the stilling basin with a negative step. Despite investigations of stilling basin with a negative step conducted by many researchers, there is not enough information about the influence of the geometric parameters on fluctuating pressure on the floor. In the present study, fluctuating pressure on the floor of the stilling basin with a negative step was systematically investigated by a total of 85 model tests. The results show that the fluctuating pressure coefficient Cp’ has a process of rapid increase and decrease, and then decreases slowly until it becomes stable, and the maximum fluctuating pressure coefficient Cp’max lies in the reattachment zone rather than in the jet impingement area for Type II-jump. The dominant frequency of the fluctuating pressure on the floor shows a decreasing trend along stilling basin. With the increase of the step height, the Cp’max presents decreasing trend but X*0 where the Cp’max occurs increasing trend. While there has on obvious regularity between incident angle and Cp’. Finally, according to the fitting of test data, an empirical formula to calculate Cp’max is developed. These research results provide reference for the design of stilling basin with a negative step in engineering applications.

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“…They indicated that the hydraulic jump features are strongly influenced by sill geometry. In addition, hydraulic jumps in the sudden expanding channel have been studied by many scientists (e.g., Omid et al 2010;Scorzini et al 2016;Torkamanzad et al 2019;Hassanpour et al 2021).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Experimental study of spatial hydraulic jump stabilization using lateral jet flow

et al. 2022

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The present experimental study analyzes the effects of lateral jet flow (LJF) in a stilling basin with abruptly expanding channels on the stabilization and the significant characteristics of spatial hydraulic jump. The experiments were carried out with three different inflow Frude number (8.77,9.56,and 10.87), three different distances of the LJF from the abruptly expanding channel (0 m, 0.25 m, and 0.5 m), and one and two LJF (i.e., the number of active orifices in the LJF system). According to the results, both distances of the LJF from the narrow channel and the number of LJF improve the hydraulic jump's stabilization and flow pattern enhancement in the tailwater channel. Additionally, the average sequent depth and the spatial jump length decreased by 14 and 20%, respectively, compared to no LJF. Also, using LJF increases relative energy dissipation by 12.45% on average.

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Pressure Fluctuations in the Spatial Hydraulic Jump in Stilling Basins with Different Expansion Ratio

Cited by 13 publications

References 25 publications

Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump

Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump

Pressure Fluctuations Characteristics of the Stilling Basin with a Negative Step

Experimental study of spatial hydraulic jump stabilization using lateral jet flow

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