Validation of the Eddy Viscosity and Lange Wake Models using Measured Wake Flow Characteristics Behind a Large Wind Turbine Rotor

2016 ◽  
Vol 40 (1) ◽  
pp. 21-29
Author(s):  
Sang Hyeon Jeon ◽  
Young Jun Go ◽  
Bum Suk Kim ◽  
Jong Chul Huh
Keyword(s):  
Wind Turbine ◽  
Eddy Viscosity ◽  
Flow Characteristics ◽  
Turbine Rotor ◽  
Wake Flow ◽  
Large Wind ◽  
Wind Turbine Rotor

NUMERICAL SIMULATION AND WAKE MODELING OF WIND TURBINE ROTOR AS AN ACTUATOR DISK

2012 ◽  
Vol 19 ◽  
pp. 320-330
Author(s):  
XIANG SHEN ◽  
TONGGUANG WANG ◽  
WEI ZHONG
Keyword(s):  
Wind Turbine ◽  
Axial Velocity ◽  
Turbine Rotor ◽  
Wake Flow ◽  
Pressure Jump ◽  
Actuator Disk ◽  
Momentum Theory ◽  
Viscous Shear ◽  
Wind Turbine Rotor ◽  
Wake Modeling

Numerical simulations of flow fields around the wind turbine rotor simplified as an actuator disk (AD) with zero thickness have been made to investigate the flow structure and wake development in different operation states. A N-S solver has been used and the energy extracted by the rotor is represented by a discontinuous pressure jump through the actuator disk. Axial pressure and velocity development from far upstream to far downstream is fully described by the simulations, which could never be obtained by the momentum theory. It is showed that there are significant differences in wake development between inviscid and viscous conditions. In inviscid simulations, the axial velocity keeps decreasing along the oncoming flow direction, which is consistent with the momentum theory. In viscous simulations, however, the axial velocity first decreases but then gradually recovers approaching to the undisturbed velocity, due to momentum transport from outer flow to wake flow by viscous shear effect. Based on the numerical analysis, the work of this paper is also focused on wake modeling. A new two-dimensional models based on nonlinear wake development has been developed, which is capable to describe the far wake more accurately.

scholarly journals Aerodynamic Analysis of Coning Effects on the DTU 10 MW Wind Turbine Rotor

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5753 ◽  
Author(s):  
Zhenye Sun ◽  
Wei Jun Zhu ◽  
Wen Zhong Shen ◽  
Wei Zhong ◽  
Jiufa Cao ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Farm ◽  
Cone Angle ◽  
Turbine Rotor ◽  
Tip Vortex ◽  
Bending Moments ◽  
Wind Farm Design ◽  
Blade Section ◽  
Large Wind ◽  
Wind Turbine Rotor

The size of wind turbine rotors is still rapidly increasing, though many technical challenges emerge. Novel rotor designs emerge to satisfy this up-scale trend, such as downwind load-aligned concepts, which orients the loads along the blade spanwise to greatly decrease the bending moments at the root. As the studies on the aerodynamics of these rotor concepts using 3D body-fitted mesh are very limited, this paper establishes different cone configurations based on the DTU 10 MW reference rotor and conducts a series of simulations. It is found that the cone angle and the distance from the blade section to the tip vortex are two deterministic factors on conning. Upwind rotors have larger power output, less thrust, smaller wake deficit, and smaller influencing area than downwind rotors of the same size, which provides superior aerodynamic priority and benefits wind farm design. The largest upwind cone angle of 14.03°, among the cases studied, leads to the highest torque to thrust ratio which is 3.63% higher than the baseline rotor. The downwind load-aligned rotor, designed to reduce the blade root bending moments at large wind speed, performs worse at the present simulation conditions than an upwind rotor of the same size.

scholarly journals Large Wind Turbine Rotor Design using an Aero-Elastic / Free-Wake Panel Coupling Code

2016 ◽  
Vol 753 ◽  
pp. 042017 ◽  
Author(s):  
Matias Sessarego ◽  
Néstor Ramos-García ◽  
Wen Zhong Shen ◽  
Jens Nørkær Sørensen
Keyword(s):  
Wind Turbine ◽  
Turbine Rotor ◽  
Rotor Design ◽  
Free Wake ◽  
Large Wind ◽  
Wind Turbine Rotor
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