Numerical study of the Winter-Kennedy method for relative transient flow rate measurement

Earth and Environment

Document identifier: oai:DiVA.org:ltu-77298
Access full text here:10.1088/1755-1315/405/1/012022
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Winter-Kennedy, Transient flow rate, Hydro power, Strömningslära, Fluid Mechanics
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

The Winter-Kennedy (WK) method is used to estimate relative flow rate using the differential pressure between two taps located at a radial section of a spiral casing (SC). It is widely used in index testing, for double regulated turbines optimization and sometimes for continuous discharge measurement in low head plants. This paper explores the possibility of using the WK method for relative transient flow rate measurements. A numerical model of a Kaplan model turbine from the penstock to the distributor has been developed. Unsteady RANS simulations with k-ω SST turbulence model are performed. Previously conducted experiments on the model turbine are used to validate the numerical results. In the simulations, the guide vanes (GVs) are closed from 26.5°, the best efficient point (BEP), to about 5° opening angle. Two azimuthal locations of the SC and four different WK configurations at each location are considered. The variation of the WK coefficients with time are investigated and compared to the ones at several stationary GV angles. The results showed a difference between the WK coefficients obtained at transient and stationary operations. However, there may be a possibility of using the WK method during transients by locating the pressure taps in appropriate locations for an acceptable variation of the WK coefficient from its BEP value.

The research has been funded by Swedish Hydropower Centre (SVC).

Authors

Binaya Baidar

Luleå tekniska universitet; Strömningslära och experimentell mekanik
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Jonathan Nicolle

Institut de recherche d'Hydro-Québec, Varennes, QC, Canada
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Bhupendra K Gandhi

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, India
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Michel Cervantes

Luleå tekniska universitet; Strömningslära och experimentell mekanik
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