Comparative analysis of different wave turbine designs based on conditions relevant to northern coast of Egypt

Ahmed Shehata, Qing Xiao, Mohamed El-Shaib, Ashraf Sharara, Alexander Day

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Wave energy has a great potential to solve the unrelenting energy deficiency in Egypt. The present work recommends Wells turbine as a suitable choice for the Egyptian coasts due to its simple and efficient operation under low input air flow. In addition, the possibility of extracting the wave energy from the Egyptian coasts was investigated using the oscillating water system based on real data from the site. To achieve this purpose, two-dimensional numerical models for Wells turbine airfoils, functioning under sinusoidal wave flow conditions, were built. Moreover, the running and starting characteristics under sinusoidal-flow conditions were investigated using a mathematical code. The results were discussed using the first law analysis, in addition to the second law analysis by using the entropy generation minimization method. It was found that the NACA0015 airfoil always gives a global entropy generation rate that is less than other airfoils by approximately -14%, -10.3% and -14.7% for the sinusoidal wave with time periods equal to 4, 6 and 8 seconds respectively. Moreover, the effects of blade profile, time period and solidity on the output power (kW) value were discussed.
LanguageEnglish
Pages450-467
Number of pages18
JournalEnergy
Volume120
Early online date22 Nov 2016
DOIs
Publication statusPublished - 1 Feb 2017

Fingerprint

Coastal zones
Turbines
Airfoils
Entropy
Numerical models
Air
Water

Keywords

  • Wells turbine
  • entropy generation
  • CFD
  • analytical model
  • sinusoidal wave
  • Egyptian coasts

Cite this

@article{1ef2323a06324e8093b88445771ff019,
title = "Comparative analysis of different wave turbine designs based on conditions relevant to northern coast of Egypt",
abstract = "Wave energy has a great potential to solve the unrelenting energy deficiency in Egypt. The present work recommends Wells turbine as a suitable choice for the Egyptian coasts due to its simple and efficient operation under low input air flow. In addition, the possibility of extracting the wave energy from the Egyptian coasts was investigated using the oscillating water system based on real data from the site. To achieve this purpose, two-dimensional numerical models for Wells turbine airfoils, functioning under sinusoidal wave flow conditions, were built. Moreover, the running and starting characteristics under sinusoidal-flow conditions were investigated using a mathematical code. The results were discussed using the first law analysis, in addition to the second law analysis by using the entropy generation minimization method. It was found that the NACA0015 airfoil always gives a global entropy generation rate that is less than other airfoils by approximately -14{\%}, -10.3{\%} and -14.7{\%} for the sinusoidal wave with time periods equal to 4, 6 and 8 seconds respectively. Moreover, the effects of blade profile, time period and solidity on the output power (kW) value were discussed.",
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Comparative analysis of different wave turbine designs based on conditions relevant to northern coast of Egypt. / Shehata, Ahmed; Xiao, Qing; El-Shaib, Mohamed; Sharara, Ashraf; Day, Alexander.

In: Energy, Vol. 120, 01.02.2017, p. 450-467.

Research output: Contribution to journalArticle

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AU - Xiao, Qing

AU - El-Shaib, Mohamed

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AU - Day, Alexander

PY - 2017/2/1

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AB - Wave energy has a great potential to solve the unrelenting energy deficiency in Egypt. The present work recommends Wells turbine as a suitable choice for the Egyptian coasts due to its simple and efficient operation under low input air flow. In addition, the possibility of extracting the wave energy from the Egyptian coasts was investigated using the oscillating water system based on real data from the site. To achieve this purpose, two-dimensional numerical models for Wells turbine airfoils, functioning under sinusoidal wave flow conditions, were built. Moreover, the running and starting characteristics under sinusoidal-flow conditions were investigated using a mathematical code. The results were discussed using the first law analysis, in addition to the second law analysis by using the entropy generation minimization method. It was found that the NACA0015 airfoil always gives a global entropy generation rate that is less than other airfoils by approximately -14%, -10.3% and -14.7% for the sinusoidal wave with time periods equal to 4, 6 and 8 seconds respectively. Moreover, the effects of blade profile, time period and solidity on the output power (kW) value were discussed.

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