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The Betz limit applied to Airborne Wind Energy

Renewable Energy, 2018
Abstract In this paper we revisit the modeling framework used to derive the Betz limit of power extraction from the wind based on linear momentum theory. One of our contributions is to suggest that the Betz limit of 16 / 27 ≈ 59 % should in fact hold true for any device that harvests power through drag or torque in a horizontal-axis ...
Romeu Reginatto, Alexandre Trofino
exaly   +3 more sources

Optimal Distribution of the Disk Load: Validity of the Betz–Joukowsky Limit

AIAA Journal, 2022
The popular axial momentum theory relies on the steady, incompressible, axisymmetric, and inviscid flow through a so-called actuator disk. The most important result of this theory is the famous Betz–Joukowsky limit, stating that the maximum power coefficient achievable by an open disk is limited to 16/27.
Bontempo, Rodolfo, Manna, Marcello
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Conflicts In Betz Limit and An Alternative Approach for Wind Turbines

2020 IEEE Region 10 Symposium (TENSYMP), 2020
The popularly accepted Betz limit for wind turbines calculates that the incoming wind speed can be reduced to only a third, and efficiency can be at most 59.3 %. This paper suggests that Betz may be based on the paradoxical derivation and assumption that wind speed at the turbine is the average of the incoming and outgoing wind speeds.
Shahriar Khan
exaly   +2 more sources

Exceeding the Betz limit with tidal turbines

Renewable Energy, 2013
Abstract The Betz limit sets a theoretical upper limit for the power production by turbines expressed as a maximum power coefficient of 16/27. While power production by wind turbines falls short of the Betz limit, tidal turbines in a channel can theoretically have a power coefficient several times larger than 16/27.
Ross Vennell
exaly   +2 more sources

The Betz-Joukowsky limit for the maximum power coefficient of wind turbines [PDF]

, 2009
The article addresses to a history of an important scientific result in wind energy. The maximum efficiency of an ideal wind turbine rotor is well known as the ‘Betz limit’, named after the German scientist that formulated this maximum in 1920. Also Lanchester, a British scientist, is associated with this limit, but his analysis relies on assumptions ...
Okulov, Valery, van Kuik, G.A.M.
openaire   +2 more sources

Beating Betz: Energy Extraction Limits in a Constrained Flow Field

Journal of Solar Energy Engineering, Transactions of the ASME, 2009
Abstract Experiments with diffusers and other flow concentrating devices have shown that the power performance coefficient Cp of an energy extraction device, defined in relation to the area of flow intercepted at the device, may exceed the Betz limit.
exaly   +2 more sources

Reexamination of Betz’s Limit for Wind Engines

Journal of Contemporary Physics (Armenian Academy of Sciences), 2021
Wind energy is one of the main factors in the future transition to renewable energies. Hence, it is important to understand how much work can be extracted from the kinetic energy of the wind. Understanding these constraints is important for setting correct strategic goals in wind power research and industry.
A. E. Allahverdyan, E. A. Khalafyan
openaire   +1 more source

Analysis of unsteady flow effects on the Betz limit for flapping foil power generation

Journal of Fluid Mechanics, 2020
Abstract
John Young, Fang-Bao Tian, Zhengliang Liu, Joseph C. S. Lai, Nima Nadim, Anthony D. Lucey   +5 more
openaire   +1 more source