Research Article
Dec 1971
Drag Forces on Baffle Blocks in Hydraulic Jumps
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 97, Issue 12
Abstract
Large bluff-shaped objects (baffle blocks) placed in the jump improve the hydraulic jump performance characteristics. Knowledge of the drag force on the blocks would aid in determining the optimum block geometry. The highly turbulent and nonuniform flow in the jump prevent a theoretical solution to the problem. An experimental technique similar to that employed by aerodynamicists was used to directly measure the drag forces. Block location, height, width, spacing, second-row location, and shape were the geometrical variables investigated. The study was limited to nonsubmerged jumps in wide, rectangular, horizontal channels. A drag force ratio using the free jump, sequent depth pressure force proved more practical for data correlation than a classical drag coefficient. Resultant downstream water depths computed using the measured drag force compared favorably with experimentally measured values. The results enable the designer to calculate the drag force for a wide range of block geometries and jump inlet Froude numbers from 3 to 10.
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Information
Published In
Journal of the Hydraulics Division
Volume 97 • Issue 12 • December 1971
Pages: 2023 - 2035
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Dec 1971
Published online: Feb 3, 2021
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Authors
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David R. Basco, AM.ASCE
Asst. Prof., Texas A&M Univ., College Station, TX, USA
John R. Adams, AM.ASCE
Assoc. Prof. Sci., Illinois State Water Survey, Urbana, IL, USA
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.