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

B. J. Lewis, John Michael Cimbala, A. M. Wouden

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number022006
JournalIOP Conference Series: Earth and Environmental Science
Volume15
Issue numberPART
DOIs
StatePublished - Dec 1 2012
Event26th IAHR Symposium on Hydraulic Machinery and Systems - Beijing, China
Duration: Aug 19 2012Aug 23 2012

Fingerprint

torque
turbine
flow velocity
experiment
method

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

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title = "Investigation of distributor vane jets to decrease the unsteady load on hydro turbine runner blades",
abstract = "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.",
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Investigation of distributor vane jets to decrease the unsteady load on hydro turbine runner blades. / Lewis, B. J.; Cimbala, John Michael; Wouden, A. M.

In: IOP Conference Series: Earth and Environmental Science, Vol. 15, No. PART, 022006, 01.12.2012.

Research output: Contribution to journalConference article

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AU - Cimbala, John Michael

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AB - 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.

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