Results 31 to 40 of about 2,810 (193)

Theoretical Calculation of Wind (Or Water) Turbine: Extending the Betz Limit

, 2021
The Betz limit sets a theoretical upper limit for the power production by turbines expressed as a maximum power coefficient of 16/27. Betz’s theory is accurate and it is based on the calculation of kinetic energy.
Pierre Lecanu, joel Breard, Dominique Mouaze, Bertil Smorgrav   +3 more
openaire   +2 more sources

Numerical investigation of the optimum wind turbine sitting for domestic flat roofs

Sustainable Buildings, 2018
The power capacity of roof mounted wind turbines is dependent on several factors which influence its energy yield. In this paper, an investigation has been carried out using Computational Fluid Dynamics (CFD) to determine flow distribution and establish ...
Ishfaq Salman Muhammad, Chaudhry Hassam Nasarullah   +1 more
doaj   +1 more source

A Theory for Power Extraction from Passive Accelerators and Confined Flows

Energies, 2020
No accepted fluid theory exists for power extraction from unpressurized confined flow. The absence of a valid model to determine baseline uniform power extraction in confined flows creates difficulties in characterizing the coefficient of power ...
Robert Freda, Bradford Knight, Siddharth Pannir   +2 more
doaj   +1 more source

A large-eddy simulation analysis of collective wind farm axial-induction set points in the presence of blockage [PDF]

Wind Energy Science
Over the past few years, numerous studies have shown the detrimental impact of flow blockage on wind farm power production. In the present work, we investigate the benefits of a simple collective axial-induction set point strategy for power maximization ...
T. Delvaux, J. Meyers
doaj   +1 more source

Theoretical Analysis of Shrouded Horizontal Axis Wind Turbines

Energies, 2017
Numerous analytical studies for power augmentation systems can be found in the literature with the goal to improve the performance of wind turbines by increasing the energy density of the air at the rotor.
Tariq Abdulsalam Khamlaj, Markus Peer Rumpfkeil   +1 more
doaj   +1 more source

Superadiabatic transitions in quantum molecular dynamics [PDF]

, 2009
We study the dynamics of a molecule’s nuclear wave function near an avoided crossing of two electronic energy levels for one nuclear degree of freedom.
Teufel, Stefan, Betz, Volker, Betz, V., Teufel, S., Goddard, B.D., Goddard, B.   +5 more
core   +1 more source

An Investigation of a Mathematical Model for the Internal Velocity Profile of Conical Diffusers Applied to DAWTs

Anais da Academia Brasileira de Ciências, 2015
The Diffuser Augmented Wind Turbines (DAWTs) have been widely studied, since the diffusers improve the power coefficient of the wind turbine, particularly of small systems.
DISTERFANO L.M. BARBOSA, JERSON R.P. VAZ, SÁVIO W.O. FIGUEIREDO, MARCELO DE OLIVEIRA E SILVA, ERB F. LINS, ANDRÉ L.A. MESQUITA   +5 more
doaj   +1 more source

Theoretical and Empirical Limits: Reexamining Betz’s Upper Limit towards a Practical Power Coefficients in Wind Turbines^*

World Journal of Engineering and Technology
Richard M. Kimiti, Francis N. Kariuki, Joseph N. Kamau, Timonah N. Soitah   +3 more
exaly   +2 more sources

Flow physics beyond the Betz limit

, 2023
A pivotal theoretical result of the early 20th century demonstrated that the limit of energy extraction for a wind or tidal stream turbine from an unconstrained flow is 16/27 of the upstream kinetic flux passing through the turbine area, known as the ‘Betz Limit’.
openaire   +2 more sources

Theoretical calculation of wind (Or water) turbine considering kinetic and potential energy to exceed the Betz limit

, 2023
The Betz limit sets a theoretical upper limit for the energy efficiency of turbines. The energy efficiency of turbines, expressed as a maximum power coefficient of 16/27. Betz's theory is precise and is based on the calculation of kinetic energy. However,
Mouazé, Dominique, Lecanu, Pierre, Normandajc, Bréard, Joël   +2 more
core   +1 more source