Investigation of distributor vane jets to decrease the unsteady load on hydro turbine runner blades

As the runner blades of a Francis hydroturbine pass though the wakes created from the wicket gates, they experience a significant change in absolute velocity, flow angle, and pressure. The concept of adding jets to the trailing edge of the wicket gates is proposed as a method for reducing the dynami...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2012-11, Vol.15 (2), p.22006
Main Authors: Lewis, B J, Cimbala, J M, Wouden, A M
Format: Article
Language:English
Subjects:
Blades
Computer applications
Distributors
Dynamic loads
Gates
Hydraulic turbines
Jets
Torque
Trailing edges
Turbines
Variation
Velocity
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Summary:As the runner blades of a Francis hydroturbine pass though the wakes created from the wicket gates, they experience a significant change in absolute velocity, flow angle, and pressure. The concept of adding jets to the trailing edge of the wicket gates is proposed as a method for reducing the dynamic load on the hydroturbine runner blades. Computational experiments show a decrease in velocity variation experienced by the runner blade with the addition of the jets. The decrease in velocity variation resulted in a 43% decrease in global torque variation at the runner passing frequency. However, an increased variation was observed at the wicket gate passing frequency. Also, a 5.7% increase in average global torque was observed with the addition of blowing from the trailing-edge of the wicket gates.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/15/2/022006