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Pr. Dezhi Ning

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China.


Talk Title
Hydrodynamic Performance of a Dual-Chamber Oscillating Water Column Wave Energy Converter

Talk Abstract

To cope with the continuous increase in the global energy demand and tackle the environmental problems accompanied with the excessive use of fossil fuels, marine renewable energy including wave energy resources have drawn the attention to many developers and researchers worldwide. Among the several techniques available to extract wave energy, the Oscillating Water Column (OWC) device is internationally recognised to be one of the most leading technologies. A great volume of prevous researches have been carried out to investigate the hydrodynamic performance of single-chamber OWC, which is recognized to be an efficient absorber only when it operates at near-resonance. In order to enhance device performance and extract more wave energy over a broader range of wave conditions, dual–chamber OWC devices for onshore and offshore multipurpose applications have been suggested and tested. As an extension of the authors' previous work (Ning et al., Applied Energy, 2016,168:636-648. ), the present work considers a fixed OWC wave energy device with two independent sub-chambers. The hydrodynamic performance of the proposed OWC device is compared with the single-chamber device. The hydrodynamic efficiency, free surface elevations and air pressures in the two sub-chambers are investigated experimentally and numerically. The numerical wave flume is developed based on an improved fully nonlinear higher-order boundary element method by introducing artifical viscous effect. The experimental tests were performed in a wave flume at Dalian University of Technology. It is found that the dual-chamber OWC device broadens the effective frequency bandwidth and performs better than the single-chamber device. The findings contribute towards the design and operation of practical OWC devices for efficiently utilizing ocean waves to produce electricity. The talk will be interesting to the audience in the field of marine renewable energy.

Short Biography

Prof. Ning got his PhD degree major in Port, Coastal and Offshore Engineering at Dalian University of Technology (DUT) in 2005. Then he worked at the University of Oxford as a Postdoctoral Research from 2005 to 2007. Now, he is the professor in the field of coastal and ocean engineering at Dalian University of Technology. He currently serves as the Head of the Offshore Renewable Energy Research Centre and vice dean of the School of Hydraulic Engineering at DUT and the Associate Director of the State Key Laboratory of Coastal and Offshore Engineering, leading one of the top research groups in China on wave hydrodynamics and wave energy conversion (WEC). He is the Principal Investigator for four major projects sponsored by the National Science Foundation of China (NSFC), and he is supported by the highly-competitive Excellent Young Scientist programme in China. He also leads a Royal Academy of Engineering Project under Newton Fund for the integration of WECs and floating breakwaters. He has published over 150 peer-reviewed journal/conference papers, and chaired UK-China Tidal Stream Energy Collaborative Workshop in 2015 and 32nd International Workshop of Water Waves and Floating Bodies in 2016. He served as the Editorial Boarding member of eight journals.

Talk Keywords
Oscillating Water Column; Wave Energy Converter; Dual-Chamber; Higher-Order Boundary Element Method; Resonance.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

The International Conference on Innovative Applied Energy (IAPE’18)