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The influence of blade roughness on the performance of a vertical axis tidal turbine

Priegue Molinos, Luis and Stoesser, Thorsten 2017. The influence of blade roughness on the performance of a vertical axis tidal turbine. International Journal of Marine Energy 17 , pp. 136-146. 10.1016/j.ijome.2017.01.009

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Abstract

This paper reports the findings of an experimental study investigating the influence of blade roughness on the performance of a vertical axis tidal turbine. Due to their design, vertical axis turbines undergo periods of stall, i.e. flow separation from the blade, during each revolution. It is hypothesised that roughening turbine blades delays flow separation (in analogy to flows over rough bluff bodies) and hence diminishes turbine stall which in turn should result in an increase in turbine performance. Laboratory experiments were undertaken in Cardiff University’s hydraulics laboratory, testing vertical axis turbines with rotors comprising smooth and rough blades. Three different blade surface roughnesses were tested, with the results showing a significant reduction in performance when the turbine is operating at high chord Reynolds numbers and with rough blades. In addition, the combined effect of blade roughness and rotor solidity as well as blade roughness and number-of-blades on the performance of vertical axis turbines are analysed. It is shown that solidity and number-of-blades appear to be similarly influential than blade roughness.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 2214-1669
Date of Acceptance: 11 January 2017
Last Modified: 08 May 2019 02:36
URI: http://orca.cf.ac.uk/id/eprint/102949

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