Cavitation: Difference between revisions
No edit summary |
No edit summary |
||
| Line 11: | Line 11: | ||
<!-- Introductory paragraph or topic page summary --> | <!-- Introductory paragraph or topic page summary --> | ||
"Cavitation damage is initiated by spillway flows over a defect along the flow surface. The defect creates localized negative pressures within the flow which create vapor bubbles. Individual vapor bubbles converge and form larger vapor cavities. When the vapor cavities impact the flow surface they implode and generate large forces which damage the flow surface. Cavitation generally requires long flow durations (weeks or months) to produce significant damage. The potential for cavitation damage to initiate can be predicted with the cavitation index, which is a function of the flow velocity, the pressure along the flow surface and the vapor pressure of water | "Cavitation damage is initiated by spillway flows over a defect along the flow surface. The defect creates localized negative pressures within the flow which create vapor bubbles. Individual vapor bubbles converge and form larger vapor cavities. When the vapor cavities impact the flow surface they implode and generate large forces which damage the flow surface. Cavitation generally requires long flow durations (weeks or months) to produce significant damage. The potential for cavitation damage to initiate can be predicted with the cavitation index, which is a function of the flow velocity, the pressure along the flow surface and the vapor pressure of water." <ref name="DForg">[https://damfailures.org/lessons-learned/concrete-lined-spillways-are-vulnerable/ Lesson Learned: Concrete-lined spillways are vulnerable to significant damage and potential reservoir breach if flows are not safely contained within the conveyance structure, William Fiedler, ASDSO, 2022]</ref> | ||
==Examples== | ==Examples== | ||
Revision as of 22:13, 13 December 2022
|
| Learn more about the dangers of cavitation at DamFailures.org |
"Cavitation damage is initiated by spillway flows over a defect along the flow surface. The defect creates localized negative pressures within the flow which create vapor bubbles. Individual vapor bubbles converge and form larger vapor cavities. When the vapor cavities impact the flow surface they implode and generate large forces which damage the flow surface. Cavitation generally requires long flow durations (weeks or months) to produce significant damage. The potential for cavitation damage to initiate can be predicted with the cavitation index, which is a function of the flow velocity, the pressure along the flow surface and the vapor pressure of water." [1]
Examples
Learn more about the damage that was caused by cavitation at Glen Canyon Dam (DamFailures.org)
Best Practices Resources
Hydraulic Design of Spillways (EM 1110-2-1603) (U.S. Army Corps of Engineers)
Cavitation in Chutes and Spillways (EM 42) (Bureau of Reclamation)
Trainings
On-Demand Webinar: Intro to Cavitation in Chutes and Spillways
On-Demand Webinar: Designing Spillways to Mitigate Failure Modes
Citations:
Revision ID: 5475
Revision Date: 12/13/2022