Energy balance analysis for an oscillating water column wave energy converter

Fleming, Alan; Penesis, Irene; Macfarlane, Gregor; Bose, Neil; Denniss, Tom

doi:10.1016/j.oceaneng.2012.07.002

Cited by 43 publications

(15 citation statements)

References 2 publications

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“…Here, E A is the absorbed power of the OWC device, and E I is the flux of the incidence wave energy, which can be theoretically calculated [21,22]…”

Section: Power Take-off Modelmentioning

confidence: 99%

Hydrodynamic Investigation of a Dual-Cylindrical OWC Wave Energy Converter Integrated into a Fixed Caisson Breakwater

et al. 2020

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A fixed dual cylindrical oscillating water column (OWC) acting as a breakwater-type wave energy converter (WEC) is proposed to harvest the wave energy effectively for shallow offshore sites. An analytical model is developed to investigate the hydrodynamic characteristics and the energy capture capacity of the cylindrical OWC device in severe waves. Based on the linear potential flow theory, the analytical solutions of the velocity potential in diffraction mode are solved by matching the Eigen-function expansion technique, and the continuous conditions of the velocity potential and fluid velocity between the computational sub-domains are involved in solving the problem for determining a solution. The proposed model is verified against the published data. The effects of the wave height, the angle of chamber clapboard and the radius of the inner and outer cylindrical column on the energy conversion efficiency are investigated in this paper. To improve the energy conversion performance and obtain a faster prediction for structural optimization of the cylindrical OWC, the geometrical parameters are further discussed in the analytical model. The results indicate that the geometrical parameters of the chamber have significant effects on the wave energy absorption efficiency. It is found that the effective frequency bandwidth of the dual cylindrical column can be broadened by improving the angle of the chamber clapboard and the inner–outer cylinder diameter ratio.

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“…Here, E A is the absorbed power of the OWC device, and E I is the flux of the incidence wave energy, which can be theoretically calculated [21,22]…”

Section: Power Take-off Modelmentioning

confidence: 99%

Hydrodynamic Investigation of a Dual-Cylindrical OWC Wave Energy Converter Integrated into a Fixed Caisson Breakwater

et al. 2020

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“…In this context, for instance, the energy conservation and dissipation properties of time-integration methods were investigated by Acary [34] for the non-smooth elastodynamics with contact. Even though several researchers in various elds such as hydrodynamic [35], aerospace [36,37], and CFD (Computational Fluid Dynamics) [38,39] have studied the energy method to determine the response of their dynamic systems, yet insigni cant attention has been paid to this topic in structural dynamics, except for a few studies that have often tried to use Hamilton's Principle in order to calculate the frequency of simple SDF structures (see, for example [40,41]).…”

Section: Introductionmentioning

confidence: 99%

Novel Technique for Dynamic Analysis of Shear-Frames Based on Energy Balance Equations

2018

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In this paper, an e cient computational solution technique based on the energy balance equations is presented to perform the dynamic analysis of shear frames, as an example of a multi-degree-of-freedom system. After deriving the dynamic energy balance equations for these systems, a new mathematical solution technique called elimination of discontinuous velocities is proposed to solve a set of coupled quadratic algebraic equations. The method will be illustrated for the free vibration of a two-story structure. Subsequently, the damped dynamic response of a three-story shear frame, which is subjected to harmonic loading, is considered. Finally, the analysis of a three-story shear building under horizontal earthquake load, as one of the most common problems in earthquake engineering, is studied. The results show that this method has acceptable and greater accuracy than other techniques; it is faster than modal analysis and does not require adjusting and calibrating the stability parameter as compared to a time integration method like the Newmark method.

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“…An oscillating water column (OWC) system consists of a vertical chamber, a water column, and an air column. Ocean waves hit the chamber and the water column oscillates, which pushes air into a duct connected to the OWC (Figure ) . The duct incorporates a self‐rectifying air turbine connected to a generator, and the turbine‐generator assembly is the only rotating part above the sea level for conversion of pneumatic energy to electric energy.…”

Section: Introductionmentioning

confidence: 99%

“…Ocean waves hit the chamber and the water column oscillates, which pushes air into a duct connected to the OWC (Figure 1). [2][3][4] The duct incorporates a self-rectifying air turbine connected to a generator, and the turbine-generator assembly is the only rotating part above the sea level for conversion of pneumatic energy to electric energy. Amelioration of self-rectifying air turbines, customarily Wells and impulse, are still a Nomenclature: Acronym: BDAI, bidirectional axial-flow impulse; CT, cycle time; DAQ, data acquisition; DGV, downstream guide vane; GV, guide vane; OWC, oscillating water column; RB, rotor blades; SL, stroke length; UGV, upstream guide vanes.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of turbine-chamber coupling for wave energy conversion

et al. 2018

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Summary A bidirectional axial‐flow impulse turbine installed in an oscillating water column raises the question of damping at different wave conditions. This article reports unsteady performances of such a turbine in an airflow test rig. The rig has a piston‐cylinder arrangement, and the piston, when reciprocating, generates the oscillatory airflow. At a very low wave height (piston stroke length, <0.4 m), the turbine speed is very low. Time series analysis of pressure drop and speed are reported for higher stroke lengths, which shows the rate of increase and decrease in velocity of the turbine. Furthermore, the turbine pressure coefficient and the damping characteristics of the test rig chamber were estimated. Finally, the chamber damping verifies that the turbine‐chamber coupling effect is reciprocal.

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Energy balance analysis for an oscillating water column wave energy converter

Cited by 43 publications

References 2 publications

Hydrodynamic Investigation of a Dual-Cylindrical OWC Wave Energy Converter Integrated into a Fixed Caisson Breakwater

Hydrodynamic Investigation of a Dual-Cylindrical OWC Wave Energy Converter Integrated into a Fixed Caisson Breakwater

Novel Technique for Dynamic Analysis of Shear-Frames Based on Energy Balance Equations

Experimental analysis of turbine-chamber coupling for wave energy conversion

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