A practical geometrical comparison between free-repelled hydraulic jumps within inclined channels |
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Authors: | John Demetriou Eugene Retsinis |
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Affiliation: | 1.School of Civil Engineering. JD Research Hydrolab-A non Profit Foundation,National Technical University of Athens,Athens,Greece;2.School of Civil Engineering,National Technical University of Athens,Athens,Greece |
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Abstract: | In this experimental study a practical geometrical comparison between inclined (angle φ) free and repelled hydraulic jumps (the latter in non prismatic but abruptly expanding channels) is presented, analysed and
discussed. For repelled hydraulic jumps a considerable parameter is the expansion ratio r (=channels’ width ratio), which here is changing from r =0.5 to r =0.7. The comparison is made with the free jump (in prismatic channel, r =1), in the same ranges of angles φ (0° ⩽ φ ⩽8°) and Froude numbers (2⩽Fr
1⩽8). A practical arithmetic example is presented to show the behavioral change of conjugate depths, lengths L and depths at 0.5L, in order to receive a comparison among all pertinent geometrical quantities. The present results may be useful for the hydraulic
engineering when designing open channels. |
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