Impact pressures in falling-jet energy dissipators - literature review and preliminary experiments

Hydraulics Research Wallingford, - (1987) Impact pressures in falling-jet energy dissipators - literature review and preliminary experiments. Technical Report. Hydraulics Research Wallingford.

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Abstract

Plunge pools constitute an important category of energy dissipator, and have often been used in conjunction with overflow spillways in arc dams. Experience has shown that plunging jets can cause serious damage to the protective aprons which may be needed to prevent scour on the downstream sides of such dams. A literature review was carried out to determine what information was available about the behaviour and effects of falling jets. The amount of air entrained in a falling jet is believed to have a major effect on the pressures which it exerts, so the test rig was designed to allow air to be added to the jet in a controlled manner. The report contains results of preliminary tests on the full-size rig.

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