... of tip vortices and from the shear of the velocity deficit, has only a minor contribution to the total turbulence and with a small length scale in the range of 10–25% of the ambient turbulence length scale. Comparisons of the calibrated DWM model with ACL results for different downstream positions...

... tunnel. The inverse vortex wake model estimates the unsteady experimental blade flow conditions and loads that otherwise would have remained obscured. 22 02 2007 30 10 2007 01 07 2008 aerodynamics blades electromagnetism rotors vortices wakes wind tunnels wind turbines...

... to blade element momentum and generalized dynamic wake models built into AERODYN . Results are encouraging and justify further investigation. 09 02 2007 24 02 2008 01 07 2008 aerodynamics flow instability vortices wakes wind turbines This work began as an investigation...

... models were applied at various pitch angles corresponding to fully attached as well as stalled flow. For partially stalled flow, computed results revealed a vortical structure trailing from the blade’s upper surface close to the 40% radial station. This trailing vortex was documented as a highly unsteady...

... interference at V = 5 m ∕ s , y a w = 20 deg 01 03 2006 19 06 2006 wind turbines flow instability vortices blades wind tunnels design engineering vortex model unsteady and steady flows blade flexibility tower interference The flow past...

... and characterized on HAWT blades operating under yawed flow conditions, during field tests ( 20 ), and in wind tunnel experiments ( 21 ). These investigations have established the basic conformation and general kinematics of three-dimensional dynamic stall vortices on wind turbine blades. However, alterations...

... of the turbulent kinetic energy is also augmented by the vorticity induced by the VG. The model is evaluated by studying the flow past a blade section with and without VGs. An analysis of the performance of nine alternative VG configurations is also presented to demonstrate the sensitivity of the airfoil polars...

... 2003 07 July 2003 26 11 2003 wind turbines wind tunnels physics computing vortices During the last decade some fifteen wind turbine airfoils have been designed at DUT, of which five have been extensively tested in the Delft University wind tunnel (LST) and four in the low...

... Solar Energy Division January 10, 2003; final revision, May 28, 2003. Associate Editor. D. Berg. 10 January 2003 28 May 2003 26 11 2003 wind turbines rotors vortices optimisation viscosity Optimization of complex systems such as wind turbine blades is an open-ended...

... ENGINEERING . Manuscript received by the ASME Solar Energy Division, March 2002; final revision, June 2002. Associate Editor: A. Kripus. 01 March 2002 01 June 2002 27 01 2003 zinc compounds solar absorber-convertors solar heating chemical reactions vortices latent heat...

.... The problem has been studied for many years, but rapid improvements in numerical simulation software and computer hardware have now made it feasible to gain more insight into its unsteady flow physics. A second important issue is the effect of boundary-layer transition on the bubble vorticity shedding...

... wind power plants wind turbines rotors wakes vortices It is common practice to passively control overshoots in power and loads on small wind turbines by configuring them to yaw to large angles at higher wind speeds. A key feature for achieving this behavior is to laterally offset the rotor...

... histories and normal force records were used to characterize dynamic stall vortex kinematics and normal forces. Stall vortices occupied approximately two-thirds of the aerodynamically active blade span and persisted for nearly one-fourth of the blade rotation cycle. Stall vortex convection varied...

... zinc compounds reduction (chemical) vortices thermal analysis heat transfer The solar co-production of zinc and synthesis gas (syngas) by the combined reduction of ZnO and reforming of CH 4 has been proposed for the thermochemical conversion of solar energy into storable...

..., using the SynMet process, solar energy is converted into storable and transportable chemical fuels. solar absorber-convertors solar energy concentrators solar heating furnaces chemical energy conversion fuel vortices thermodynamics thermal analysis 2001 ASME ...

... surrounding the rotor. The rest of the flow field is modeled using a potential flow methodology. The tip vortices are modeled using a free wake approach, which allows the vortices to deform and interact with each other. Sample results are presented for two rotor configurations tested by the National Renewable...