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

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...

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Main Authors: Oppong, Stephen, Lam, Wei Haur, Guo, Jianhua, Tan, Leng Mui, Ong, Zhi Chao, Tey, Wah Yen, Lee, Yun Fook, Ujang, Zaini, Dai, Ming, Robinson, Desmond, Hamill, Gerard
Format: Article
Published: Springer Verlag (Germany) 2020
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TJ Mechanical engineering and machinery
Online Access:http://eprints.um.edu.my/25446/
https://doi.org/10.1007/s12205-020-1910-4
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spelling my.um.eprints.254462020-08-25T04:47:36Z http://eprints.um.edu.my/25446/ Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine Oppong, Stephen Lam, Wei Haur Guo, Jianhua Tan, Leng Mui Ong, Zhi Chao Tey, Wah Yen Lee, Yun Fook Ujang, Zaini Dai, Ming Robinson, Desmond Hamill, Gerard TJ Mechanical engineering and machinery 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. Springer Verlag (Germany) 2020 Article PeerReviewed 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 https://doi.org/10.1007/s12205-020-1910-4 doi:10.1007/s12205-020-1910-4
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Oppong, Stephen
Lam, Wei Haur
Guo, Jianhua
Tan, Leng Mui
Ong, Zhi Chao
Tey, Wah Yen
Lee, Yun Fook
Ujang, Zaini
Dai, Ming
Robinson, Desmond
Hamill, Gerard
Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
description 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.
format Article
author Oppong, Stephen
Lam, Wei Haur
Guo, Jianhua
Tan, Leng Mui
Ong, Zhi Chao
Tey, Wah Yen
Lee, Yun Fook
Ujang, Zaini
Dai, Ming
Robinson, Desmond
Hamill, Gerard
author_facet Oppong, Stephen
Lam, Wei Haur
Guo, Jianhua
Tan, Leng Mui
Ong, Zhi Chao
Tey, Wah Yen
Lee, Yun Fook
Ujang, Zaini
Dai, Ming
Robinson, Desmond
Hamill, Gerard
author_sort Oppong, Stephen
title Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
title_short Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
title_full Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
title_fullStr Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
title_full_unstemmed Predictions of Wake and Central Mixing Region of Double Horizontal Axis Tidal Turbine
title_sort predictions of wake and central mixing region of double horizontal axis tidal turbine
publisher Springer Verlag (Germany)
publishDate 2020
url http://eprints.um.edu.my/25446/
https://doi.org/10.1007/s12205-020-1910-4
_version_ 1680857032677130240
score 13.211869

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