RT journal article
T1 A comprehensive CFD investigation of tip vortex trajectory in shrouded wind turbines using compressible RANS solver
A1 Silva, Paolo A.S.F.
A1 Tsoutsanis, Panagiotis
A1 Vaz, Jerson R.P
A1 Machuca Macías, Marianela
A2 Ingeniería Mecánica y Diseño Industrial
K1 Wind turbine
K1 Tip vortex
K1 Wake
K1 CFD
K1 Shroud
AB It is well known that a shroud placed around a wind turbine can increase its power coefficient, but it bringscomplex mechanisms by which the shroud alters the flow passing through the rotor. Such mechanisms imposenumerical challenges, as the shrouded turbines present nonlinear behavior in the wake. This paper deals witha comprehensive analysis of tip vortex trajectory in shrouded wind turbines using Reynolds Averaged Navier–Stokes numerical solutions. The analysis includes aerodynamic performance and vortex characteristics of thewhole wind turbine. The Multiple Reference Frame is used on a high-order unstructured compressible solverto study both, isolated and shrouded rotor. The NREL Phase VI Unsteady Aerodynamic Experiment rotor isused as a test case. The accuracy of results for wind speeds between 7 and 25 𝑚��𝑠��−1 is discussed. Overall, goodagreement is achieved between the computed pressure distributions and the experimental reference values. Atstalled blade, more efforts are needed to improve numerical solutions, especially for integrated load quantities.The vortex structure is examined, showing that shroud impacts tip vortex trajectory by the increase of theaxial induced velocity at the rotor plane. This result, demonstrates that the classical Prandtl tip loss is notaccurate for shrouded turbine analysis, and modern finite blade functions are needed. The influence of theflow conditions on the tip vortex trajectory, flow separation and shroud interaction are also discussed.
SN 0360-5442
YR 2024
FD 2024-03-09
LK http://hdl.handle.net/10498/32891
UL http://hdl.handle.net/10498/32891
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026