Vibrations in a Francis Turbine

Jun 21st, 2015
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Perturbation forces which are responsible for increase in vibration in a hydro turbine, may be mechanical, hydraulic or electrical.

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Vibrations in a Francis Turbine A Case StudyOf all the type of hydro turbines, the problem of vibration in a Francis turbine is more. Generally in hydroelectric power stations, Francis turbines are used when available head is between 30m and 600m. Due to inherent design and other hydraulic factors, a lot of machines with Francis turbines face vibration problems in certain zones of operation, and in most cases operation in this troubled zone is avoided resulting in less flexibility for integrated grid operation. - Mayadhar Swain.Causes of vibration in Francis TurbinesPerturbation forces which are responsible for increase in vibration in a hydro turbine, may be mechanical, hydraulic or electrical. 1. mechanical Causesa. Centrifugal forces due to imbalance of the rotating mass i.e. runner, shaft and generator rotor. b. Elastic force of the shaft due to incorrect shaft alignment. c. Frictional forces d. Oil-film instability in bearing. 2. Hydraulic Causesa. Flow through waterways: Non uniform velocity distribution in various waterways of the turbine causing hydraulic unbalance. b. Draft tube flow instabilities: These occur in Francis turbines even during steady-stat

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