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Technical Brief

Experimental Study of the Type VI Stilling Basin Performance

[+] Author and Article Information
Seyed Sobhan Aleyasin

Mem. ASME
Department of Mechanical Engineering,
University of Manitoba,
Winnipeg, MB R3T 5V6, Canada
e-mail: aleyasss@myumanitoba.ca

Nima Fathi

Mem. ASME
Departments of Mechanical Engineering
and Nuclear Engineering,
University of New Mexico,
Albuquerque, NM 87131
e-mail: nfathi@unm.edu

Peter Vorobieff

Mem. ASME
Professor
Department of Mechanical Engineering,
University of New Mexico,
Albuquerque, NM 87131
e-mail: kalmoth@unm.edu

United States Bureau of Reclamation (USBR) VI

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 7, 2014; final manuscript received November 15, 2014; published online January 6, 2015. Assoc. Editor: Mark F. Tachie.

J. Fluids Eng 137(3), 034503 (Mar 01, 2015) (9 pages) Paper No: FE-14-1118; doi: 10.1115/1.4029164 History: Received March 07, 2014; Revised November 15, 2014; Online January 06, 2015

Understanding the estuarine turbulent flow from dams, channels, and pipes, as well as the river flow are very important due to the potential to cause damage to the bed of the river or channel and cause scouring of structures such as the saddles of bridges, because of the huge amount of the kinetic energy carried by the flow. One of the most efficient yet simple ways to dissipate this energy is to install a stilling basin at the discharge point to calm the flow. Turbulence data were recorded using acoustic Doppler velocimetry (ADV) for type VI2 of stilling basins for pipe outlets. During the study, various splitters and a cellular baffle were placed in the stilling basin, and the baffle locations were changed to assess the effect on the energy dissipation. Velocity at several locations in the basin was measured for different Froude numbers to investigate the effect of flow rate. Based on the findings of the experiments, several suggestions regarding the efficiency and geometry of stilling basins were made.

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References

Figures

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Fig. 1

Schematic of USBR VI stilling basin (left) and actual view (right) [1,10]

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Fig. 2

Apparatus arrangement

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Fig. 3

Schematics of splitter types 1 (left), 2 (center), and 3 (right). Dimensions are in mm, flow direction is from top to bottom.

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Fig. 4

Cellular baffle schematics (top) and actual view (bottom). Dimensions are in mm.

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Fig. 5

Locations for velocity measurements and schematics of splitter and baffle placement. Dimensions of experimental apparatus are labeled.

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Fig. 6

Example of Vx record with the RMS variation of turbulent velocity for test 1, variation with depth shown

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Fig. 7

Streamwise velocity change with depth (top row), with downstream distance (middle row), and with counter-streamwise distance (bottom row). Froude numbers are labeled in the plots.

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Fig. 8

Streamwise velocity change with depth (top row), with downstream distance (middle row), and with counter-streamwise distance (bottom row). Froude numbers are labeled in the plots.

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Fig. 9

Streamwise velocity change with depth (top row), with downstream distance (middle row), and with counterstreamwise distance (bottom row). Froude numbers are labeled in the plots for tests 4,5.

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Fig. 10

Streamwise velocity change with depth. Froude numbers are labeled in the plots.

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Fig. 11

Comparison of Vyz and Vx change in depth for splitters and cellular baffle at Fr = 6

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