Modares Mechanical Engineering

Modares Mechanical Engineering

Experimental evaluation of the effect of dimensionless hydrodynamic coefficients on the performance of a multi-chamber oscillating water column converter in laboratory scale

Document Type : Original Research

Authors
Behrad Alizadeh Kharkeshi 1
Rouzbeh Shafaghat 2
Omid Jahanian 2
kourosh Rezanejad 3
Rezvan Alamian 4
1 PhD. Student, Sea-Based Energy Research Group, Babol Noshirvani University of Technology, Babol, Iran
2 Associate Professor, Sea-Based Energy Research Group, Babol Noshirvani University of Technology, Babol, Iran
3 Senior Research Associate, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal
4 Senior Research Associate, Sea-Based Energy Research Group, Babol Noshir-vani University of Technology, Babol, Iran
Abstract
Wave conditions have a significant effect on the hydrodynamic behavior of OWC. As the interactions of the WEC and the incident waves are important, therefore, due to the importance of coefficients in evaluating the performance of the OWC, in this paper, the experimental evaluation of dimensionless hydrodynamic coefficients of a MC-OWC is applied. To define the experimental tests, considering the installation location of the converter on the break water, the conditions of the Caspian Sea implemented. Calibration and uncertainty analysis have performed, experimental tests have been carried out in the wave tank of the BNUT. According to the results, assuming a dimensionless water depth, with increasing dimensionless frequency of the wave, the dimensionless coefficient of transmitted wave, the dimensionless coefficient of reflected wave, dimensionless coefficient of discharge and the dimensionless coefficient of pressure increase. The results showed that due to the change of dimensionless wave number from 1.9 to 3.3, discharge coefficients, reflected wave, pressure and transmitted wave are 1.6 times, 2.2 times, 2.8 times, respectively, are 3.5 times, the dimensionless coefficient of the transmitted wave is highly sensitive to the wave conditions; the dimensional coefficient of discharge will have less changes compared to other coefficients. On the other hand, the results showed that the OWC in this study has an efficiency of 41.8% in the best case. This efficiency occurs at the dimensionless natural frequency of 0.88 and the dimensionless water intake depth of 0.032; under these conditions, the amplitude of water fluctuations inside the OWC reaches 9.6 cm.
Keywords
Renewable Energy
Oscillating Water Column
Dimensionless Hydrodynamic Coeffi-cient
Experimental Study

Subjects

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Modares Mechanical Engineering
Volume 21, Issue 12
December 2021
Pages 823-834