Experimental study on scour profile of pile-supported horizontal axis tidal current turbine. (December 2017)

• Record Type: Journal Article
• Authors: Chen, Long; Hashim, Roslan; Othman, Faridah; Motamedi, Shervin
• Is Part Of: Renewable energy. Volume 114:Part B(2017)
• Page Start: 744
• Page End: 754
• Publication Date: 2017-12
• Subjects: Tidal energy -- Tidal-current turbine -- Wake -- Scour; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2017.07.026
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The study aims to investigate the influence of tip clearance on the scour rate of pile-supported horizontal axis tidal current turbine (TCT) and also attempts to correlate time-dependent scour depth of TCT with the tip clearance. A physical model of TCT was placed in a flume for scour test and the scour rate of the fabricated model was investigated. The results suggest that the decrease in tip clearance increases the scour depth. In addition, the shortest tip clearance results in the fastest and most sediment transport. The maximum scour depth reached 18.5% of rotor diameter. Results indicate that regions susceptible to scour typically persist up to 1.0Dt downstream and up to 0.5Dt to either side of the turbine support centre. The majority of the scour occurred in the first 3.5 h. The maximum scour depth reaches equilibrium after 24 h test. An empirical formula to predict the time-dependent scour depth of pile-supported TCT is proposed. Highlights: The influence of tip clearance on the scour profile of pile-supported tidal turbine is investigated. The scour profile of tidal turbine is presented. A correlation between tip clearance and time-dependent scour rate of tidal turbine is proposed.