Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine

Oppong, Stephen and Lam, Wei Haur and Guo, Jianhua and Tan, Leng Mui and Ong, Zhi Chao and Tey, Wah Yen and Lee, Yun Fook and Ujang, Zaini and Dai, Ming and Robinson, Desmond and Hamill, Gerard (2020) Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine. KSCE Journal of Civil Engineering, 24 (7). pp. 1983-1995. ISSN 1226-7988, DOI

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Predicting the velocity distribution of double horizontal axis tidal turbines (DHATTs) is significant for the effective development of tidal streams. This current research gives an account on double turbine wake theory and flow structure of DHATT connected to single support by using the joint axial momentum theory and computational fluid dynamics (CFD) method. Characteristics of single turbine wake were previously studied with two theoretical equations predicting the initial upstream velocity closer to the turbine, and it’s lateral distributions along the downstream of the turbine. This current works agreed with the previous wake equations, which was used for predicting the velocity region along the downstream of the turbines. Flow field separating the two turbines is complicated in nature due to the indirect disturbance of turbines and no report was found on this central region. The Central region in the downstream flow is initially suppressed due to the blockage effects with a high velocity close to the free stream. Lateral expansion of two turbine wakes penetrated the central region with velocity reduction and followed by the flow recovery further downstream. This work provides more understandings of the wake and its central mixing region for double turbines with a proposed theoretical model. © 2020, Korean Society of Civil Engineers.

Item Type: Article
Funders: Natural Science Foundation of Tianjin City (Grant No. 18JCYBJC21900), Science Fund for Creative Research Groups of the National Natural Science Foundation of the Peoples Republic of China (Grant No. 51621092), UM-MoHE High Impact Research Grant ENG 47
Uncontrolled Keywords: Double turbine; Flow structure; Marine renewable energy; Tidal current turbine; Wake
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 25 Aug 2020 04:47
Last Modified: 25 Aug 2020 04:47

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