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Experimental and nu...
Experimental and numerical studies for a high head Francis turbine at several operating points
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- Trivedi, Chiragkumar (author)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik
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- Cervantes, Michel (author)
- Luleå tekniska universitet,Institutionen för teknikvetenskap och matematik
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- Gandhi, B. K. (author)
- Indian Institute of Technology, Roorkee
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- Dahlhaug, Ole G. (author)
- Norwegian University of Science and Technology (NTNU), Trondheim
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(creator_code:org_t)
- 2013-08-07
- 2013
- English.
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In: Journal of Fluids Engineering. - : ASME International. - 0098-2202 .- 1528-901X. ; 135:11
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Experimental and numerical studies on a high head model Francis turbine were carried out over the entire range of turbine operation. A complete Hill diagram was constructed and pressure-time measurements were performed at several operating conditions over the entire range of power generation by installing pressure sensors in the rotating and stationary domains of the turbine. Unsteady numerical simulations were performed at five operating conditions using two turbulent models, shear stress transport (SST) k-x and standard k-e and two advection schemes, high resolution and second order upwind. There was a very small difference (0.85%) between the experimental and numerical hydraulic efficiencies at the best efficiency point (BEP); the maximum difference (14%) between the experimental and numerical efficiencies was found at lower discharge turbine operation. Investigation of both the numerical and experimental pressure-time signals showed that the complex interaction between the rotor and stator caused an output torque oscillation over a particular power generation range. The pressure oscillations that developed due to guide vanes and runner blades interaction propagate up to the trailing edge of the blades. Fourier analysis of the signals revealed the presence of a vortex rope in the draft tube during turbine operation away from the BEP.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Strömningslära
- Fluid Mechanics
Publication and Content Type
- ref (subject category)
- art (subject category)
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