Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David H. Wood"'
Autor:
Narges Golmirzaee, David H. Wood
Publikováno v:
Advances in Aerodynamics, Vol 6, Iss 1, Pp 1-27 (2024)
Abstract This paper investigates a specific case of one of the most popular fluid dynamic simulations, the incompressible flow around an airfoil (NACA 0012 here) at a high Reynolds number ( $$6 \times 10^6$$ 6 × 10 6 ). OpenFOAM software was used to
Externí odkaz:
https://doaj.org/article/ae84ef67e07d40489c210ba0a4ff9aac
Autor:
David H. Wood
Publikováno v:
Frontiers in Energy Research, Vol 12 (2024)
Lifting line (LL) analysis of propellers and horizontal-axis turbines requires the axial and circumferential velocities induced by the vortex system representing the blades and the trailing vorticity. If the blades are straight and radial, the induce
Externí odkaz:
https://doaj.org/article/d0e96ccaf25a4f1a9d7963729d415141
Autor:
David H. Wood, Narges Golmirzaee
Publikováno v:
Frontiers in Energy Research, Vol 11 (2023)
Modern horizontal-axis wind turbines produce maximum power at an optimal tip speed ratio, λopt, of around 7. This is also the approximate start of the high-thrust region, which extends to runaway at λR ≈ 2λopt where no power is produced and the
Externí odkaz:
https://doaj.org/article/49ad731348624aba834cefcf2e52b979
Publikováno v:
Wind Energy, Vol 26, Iss 2, Pp 228-246 (2023)
Abstract Multi‐bladed windmills usually pump water for agriculture and domestic consumption, often in remote locations. Although they have been around for over 150 years, their aerodynamic performance is still poorly understood. This paper describe
Externí odkaz:
https://doaj.org/article/5780a3bd8613409591296f53d8fa747d
Autor:
Ayman Mohamed, David H. Wood
Publikováno v:
Wind Energy, Vol 24, Iss 11, Pp 1225-1248 (2021)
Abstract We present a modified version of the ONERA dynamic stall model for improving the prediction of the unsteady forces and load overshoots generated by the shedding of dynamic stall vortices. The modifications include modeling the chord‐axis f
Externí odkaz:
https://doaj.org/article/f18c9d7ee74b40c99662678e5eaa77b1
Autor:
David H. Wood, Mohamed M. Hammam
Publikováno v:
Frontiers in Energy Research, Vol 10 (2022)
This study analyzes actuator disc (AD) models of horizontal-axis turbines to determine optimal performance, defined as the maximum power extracted at any tip speed ratio. We use the calculus of variations to maximize rotor torque relative to the thru
Externí odkaz:
https://doaj.org/article/edf379fa26414c71b30df925a982bdb9
Autor:
David H. Wood
Publikováno v:
International Journal of Mathematics for Industry, Vol 12, Iss 1, Pp 2050002-1-2050002-12 (2020)
All rotating blades shed helical vortices which have a significant effect on the velocity over the blades and the forces acting on them. Nevertheless, knowledge of vortex behavior is not used in blade element theory (BET), the most common method to c
Externí odkaz:
https://doaj.org/article/cfe8eee51b234050ac42518754647daa
Publikováno v:
AIP Advances, Vol 9, Iss 4, Pp 045209-045209-15 (2019)
The relationship between vortex dynamics and surface pressure fluctuations on the leeward face of a two-dimensional normal thin flat plate was studied using Direct Numerical Simulations for incompressible flow at a Reynolds number of 1200. The vortex
Externí odkaz:
https://doaj.org/article/edfb8fa176074b1eb69e78077c951c87
Publikováno v:
Wind Energy. 26:228-246
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::708a234ed10ba14dfd8fd461c12928f9
https://doi.org/10.1002/we.2796
https://doi.org/10.1002/we.2796
