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Hydraulic Jump Fr 2.5 to 4.5

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  REPORT OF INVESTIGATION 67  Hydraulic Jump Type Stilling Basins  for Froude Number 2.5 to 4.5 by NANI G. BHOWMIK Title:  Hydraulic Jump Type Stilling Basins for Froude Number 2.5 to 4.5. Abstract:  Hydraulic jump type stilling basins are used to prevent the detrimental effects of the supercritical flow velocity on the stability of the channel. Laboratory investigations were conducted for both the ordinary and the forced hydraulic jumps on a horizontal floor in the Froude number range of 2.5 to 4.5. Data from the ordinary hydraulic jump correlate well with the theory and other published data. A set of appurtenances (baffle  blocks and an end sill, basin L) for forced hydraulic jump was found to perform satisfactorily. Comparison of the test data from this basin with corresponding data from the ordinary hydraulic jump showed that the required tail-water depth can be decreased, energy loss can be increased, and the jump can be formed in a much shorter basin. A theoretical relationship has also been developed to predict the turbulent pressure fluctuations in the stilling basins. Hydraulic design of stilling basins for the Froude number range of 2.5 to 4.5 can be accomplished with the aid of the criteria developed in the report. Reference:  Bhowmik, Nani G. Hydraulic Jump Type Stilling Basins for Froude Number 2.5 to 4.5. Illinois State Water Survey, Urbana, Report of Investigation 67, 1971. Indexing Terms:  Baffles, design criteria, energy losses, Froude number, hydraulic jump, laboratory tests, sluice gates, spillways, stilling basins, tail water, turbulence.  STATE OF ILLINOIS HON. RICHARD B. OGILVIE, Governor DEPARTMENT OF REGISTRATION AND EDUCATION WILLIAM H. ROBINSON, Director BOARD OF NATURAL RESOURCES AND CONSERVATION WILLIAM H. ROBINSON, Chairman ROGER ADAMS, Ph.D., D.Sc., LL.D., Chemistry ROBERT H. ANDERSON, B.S., Engineering THOMAS PARK, Ph.D., Biology CHARLES E. OLMSTED, Ph.D., Botany LAURENCE L. SLOSS, Ph.D., Geology WILLIAM L EVERITT, E.E., PhD., University of Illinois ROGER E. BEYLER, Ph.D., Southern Illinois University STATE WATER SURVEY DIVISION WILLIAM C. ACKERMANN, D.Sc, Chief URBANA 1971  Printed by authority of the State of Illinois-Ch. 127, IRS, Par. 58.29  CONTENTS PAGE Abstract 1 Introduction 1 Plan of report 2 Acknowledgments 2 Methodology 2 Characteristics of hydraulic jump for Froude number 2.5 to 9.0 2 Ordinary hydraulic jump 3 Profile of the ordinary hydraulic jump in a horizontal channel 4 Hydraulic jump on a sloping channel 4 Forced hydraulic jump on a horizontal floor  ............................................  5 Effects of turbulent pressure fluctuations on the stilling basin 5 Experimental procedure and data collection ; 6 Laboratory facilities 6 Data collection 8 Ordinary hydraulic jump 8 Forced hydraulic jump 8 Analysis of the data 9 Ordinary hydraulic jump 9 Relationship of depth ratio and Froude number 9 Energy loss in the jump 10 Length of the jump 10 Forced hydraulic jump 11 Tests with only end sills 11 Tests with only baffle blocks 11 Tests with baffle blocks and end sills 12 Discussion of basin L test results 24 Waves and cavitation in the stilling basin 27 Summary 29 References 30  Notations 31
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