Numerical analysis of cylindrical wedge-wire screen operation

Zielina, Michał; Pawłowska, A.; Kowalska-Polok, A.

doi:10.1201/9781315393827-120

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“…US design guidelines vary the maximum allowable approach velocity V a depending on the size and swimming ability of the individuals in question [31]. For fry less than 60 mm in length, the approach velocity at a distance of approximately 7.5 cm (originally in the guidelines 3 inches) from the screen surface should not exceed 0.06 m/s, and 0.12 m/s for longer individuals [32]. If the intake would be equipped with its own cleaning system, these velocities should not exceed 0.12 m/s and 0.24 m/s, respectively [33].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Analysis of a Passive Wedge Wire Water Intake Screen for Ichthyofauna Protection

Zielina,

Pawłowska-Salach,

Kaczmarski

2023

Applied Sciences

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A passive wedge screen, thanks to its many functional and environmental advantages, has recently become a popular type of surface water intake for municipal and industrial purposes. The design solutions proposed in this paper for a passive wedge wire screen intake model and two different deflectors have been experimentally tested under conditions that can be considered as no-flow conditions at the hydraulic flume. There was only a slight flow associated with the operation of the screen, while there was almost no flow in the hydraulic channel itself, such that it would be considered a watercourse. A hydraulic analysis was carried out, including velocity distribution around the screen as well as the determination of head losses with or without deflectors installed inside the screen. Lower inlet and inflow velocities to the surface of the water intake reduce the risk of injury or death to small fish and fry as well as attracting pollutants understood as sediments, debris, and plant remains floating in the river. In order to achieve the lowest possible maximum inlet and inflow velocities at the highest possible intake capacity, it was necessary to equalize the approach velocity distributions. It was shown that by using the proposed deflectors, the approach velocity distributions were equalized and the maximum values of inflow and inlet velocities were reduced. A water intake screen with a deflector with an uneven porosity distribution equalized the approach velocities better than a deflector with equal openings, but the differences were small. Installing the wedge screen model reduced the maximum inlet velocity from exceeding 2 m/s to a value of 0.08 m/s, and after installing deflectors with equal and unequal openings to values of 0.06 m/s and 0.05 m/s, respectively. In addition to laboratory tests, the paper describes the numerical simulations performed in ANSYS Fluent software. The results of the simulations made it possible to obtain a broader study, as well as to compare the velocity values obtained at the measuring points during the laboratory tests.

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Section: Introductionmentioning

confidence: 99%