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

  • Coastal and Harbor Engineering
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KSCE Journal of Civil Engineering Aims and scope Submit manuscript

Abstract

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.

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Acknowledgements

This study was supported by 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) and UM-MoHE High Impact Research Grant ENG 47.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300350, China

    Stephen Oppong, Wei Haur Lam & Jianhua Guo

  2. First R&D Services, A-08-16 M Suites, Kuala Lumpur, 50450, Malaysia

    Leng Mui Tan

  3. Mechanical Engineering Department, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia

    Zhi Chao Ong

  4. Dept. of Mechanical Engineering, Faculty of Engineering, UCSI University, Kuala Lumpur, 56000, Malaysia

    Wah Yen Tey

  5. Waste & Environment Division, Sepakat Setia Perunding Sdn Bhd, Seri Kembangan, 43300, Malaysia

    Yun Fook Lee

  6. UTM Kuala Lumpur, Jalan Sultan Yahya (Jalan Semarak), Kuala Lumpur, 54100, Malaysia

    Zaini Ujang

  7. School of Engineering, Computing and Mathematics (SECaM), University of Plymouth, Plymouth, PL4 8AA, UK

    Ming Dai

  8. School of Natural and Built Environment, Architecture, Civil & Structural Engineering and Planning, Queen’s University Belfast, Belfast, BT9 5AC, UK

    Desmond Robinson & Gerard Hamill

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  1. Stephen Oppong
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  2. Wei Haur Lam
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  3. Jianhua Guo
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  4. Leng Mui Tan
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  5. Zhi Chao Ong
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  6. Wah Yen Tey
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  7. Yun Fook Lee
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  8. Zaini Ujang
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  9. Ming Dai
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  10. Desmond Robinson
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  11. Gerard Hamill
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Correspondence to Wei Haur Lam.

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Oppong, S., Lam, W.H., Guo, J. et al. Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine. KSCE J Civ Eng 24, 1983–1995 (2020). https://doi.org/10.1007/s12205-020-1910-4

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  • DOI: https://doi.org/10.1007/s12205-020-1910-4

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