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Hydraulics of abrupt contraction aerator on stepped chutes

Ma, Fei / Wu, Jian-Hua

Under large unit discharges, cavitation damage may occur and energy dissipation may remarkably decline in stepped chutes due to absence of air entrainment. Herein, a pre-aeration device, entraining air by contracting the flow locally by walls without special air vent, is proposed for increasing the maximum available unit discharges. The test results demonstrate that the aerator proposed in this paper generates a ski-jump and a local hydraulic jump to entrain air into flow. It provides fully aerated flows for the stepped chutes, and significantly increases the energy dissipation with large unit discharges.

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Hydraulics of abrupt contraction aerator on stepped chutes

Ma, Fei / Wu, Jian-Hua

Under large unit discharges, cavitation damage may occur and energy dissipation may remarkably decline in stepped chutes due to absence of air entrainment. Herein, a pre-aeration device, entraining air by contracting the flow locally by walls without special air vent, is proposed for increasing the maximum available unit discharges. The test results demonstrate that the aerator proposed in this paper generates a ski-jump and a local hydraulic jump to entrain air into flow. It provides fully aerated flows for the stepped chutes, and significantly increases the energy dissipation with large unit discharges.

Hydraulics of abrupt contraction aerator on stepped chutes

Ma, Fei / Wu, Jian-Hua

Under large unit discharges, cavitation damage may occur and energy dissipation may remarkably decline in stepped chutes due to absence of air entrainment. Herein, a pre-aeration device, entraining air by contracting the flow locally by walls without special air vent, is proposed for increasing the maximum available unit discharges. The test results demonstrate that the aerator proposed in this paper generates a ski-jump and a local hydraulic jump to entrain air into flow. It provides fully aerated flows for the stepped chutes, and significantly increases the energy dissipation with large unit discharges.

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Title:

Hydraulics of abrupt contraction aerator on stepped chutes

Contributors:

Ma, Fei (author) / Wu, Jian-Hua (author)

Published in:

Journal of Hydraulic Research ; 59 ; 345-350

Publication date:

2021-03-04

Size:

6 pages

ISSN:

0022-1686 , 1814-2079

DOI:

https://doi.org/10.1080/00221686.2020.1780500

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

Keywords:

Abrupt contraction aerator , air entrainment , energy dissipation , local hydraulic jump , stepped chute

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