Effect of pre-aerated approach flow on delector-generated jets

Flip buckets are terminal spillway elements, generating free jets for energy dissipation. Deflectors are an alternative to flip buckets with constructional ease yet of similar hydraulic features. A first experimental study published at the 33rd IAHR Congress, Vancouver, investigated deflectorgenerated jets in terms of their air concentration characteristics. For jet impact onto a movable bed, the scour potential reduces as the jet air content increases. It was demonstrated that the jet air concentration development is a function of its relative black-water core length, depending on the approach flow parameters and the deflector geometry. Jet-generating structures are located at the end of spillways, where high-speed flow with considerable air transport prevails, affecting the jet parameters, such that additional experiments were conducted involving pre-aerated approach flow. The effect of pre-aeration on the air concentration development of deflector-generated jets is discussed and compared with un-aerated approach flow.


Published in:
Proceedings of the 34th IAHR World Congress, CD-ROM, 2554-2561
Presented at:
34th IAHR World Congress, Brisbane, Australia, June 26 - July 1st, 2011
Year:
2011
ISBN:
978-0-85825-868-6
Keywords:
Note:
[789]
Laboratories:




 Record created 2011-08-31, last modified 2018-09-13

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