Showing 1 - 10 of 166
The performance of an oscillating water column (OWC) wave energy converter depends on many factors, among which the incident wave conditions, the tidal level or the coupling between the chamber and the air turbine. In this work a 2D numerical model based on the RANS equations and the VOF surface...
Persistent link: https://www.econbiz.de/10011040507
The paper presents a numerical study of the air-flow in a typical pneumatic chamber geometry of an oscillating water column (OWC)-type wave energy converter (WEC), equipped with two vertical-axis air turbines, asymmetrically placed on the top of the chamber. Outwards and inwards, steady and...
Persistent link: https://www.econbiz.de/10010804284
This study analyzes the problem of the stalling behaviour in Wells turbines, one of the most widely used turbines in wave energy plants. For this purpose two different control strategies are presented and compared. In the first one, a rotational speed control system is employed to appropriately...
Persistent link: https://www.econbiz.de/10010805011
This paper presents a time-domain numerical simulator of oscillating water column (OWC) wave power plants. The whole problem (the simulation of the movements of the inner free surface due to the excitation of the outer sea-waves) is split into two subproblems: an outer one, dealing with the...
Persistent link: https://www.econbiz.de/10010805675
The flow through the air turbine of an oscillating water column (OWC) wave energy converter is reciprocating and is random and highly variable. It is not surprising that the time-averaged efficiency of the air turbine is substantially lower than that of a conventional turbine working in nearly...
Persistent link: https://www.econbiz.de/10010806136
The oscillating water column (OWC) equipped with an air turbine is one of the most actively studied devices for wave energy conversion. It consists of a partially submerged hollow structure whose upper part forms an air chamber and whose immersed part is open to the action of the sea waves. The...
Persistent link: https://www.econbiz.de/10010808977
Social acceptance, along with technical, economic and legal aspects, is a prerequisite for the successful adoption of renewable energies. Research into the social acceptance of the underlying implementation of different renewable energy technologies, such as grid connected photovoltaic solar,...
Persistent link: https://www.econbiz.de/10011049461
The study of ways of converting ocean wave energy into a useful one and the improvement of the existing equipment are complex engineering problems and very important issues in today's society. In this paper, the onshore oscillating water column device, in a 10 m deep channel subjected to 1 m...
Persistent link: https://www.econbiz.de/10011054162
The paper presents results from model testing of a self-rectifying radial-flow air turbine, that is being developed as an alternative to the axial-flow self-rectifying turbines for applications in wave energy conversion. In the new machine, named biradial turbine, the flow into, and out of, the...
Persistent link: https://www.econbiz.de/10011044066
A numerical method based on a two-phase level set with the global mass correction and immersed boundary method is developed here to simulate wave interaction with a semi-submerged chamber. An oscillating water column, where power is extracted due to a normally incident wave forcing the free...
Persistent link: https://www.econbiz.de/10011045477