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SUMMARY:Invited talk: Laboratory Studies of Wind Turbines – High Reynold
 s Number Aerodynamics
DTSTART:20191018T121500
DTEND:20191018T131500
DTSTAMP:20260429T081207Z
UID:ece8d6fc10a55d3c9b45da3e6e3a8e2d73afd5fa9f3533b066f6fcf2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Professor Marcus Hultmark\nhttp://fluids.princeton.edu\nWind 
 turbines and wind farms present unique challenges\, fluid mechanically\, a
 s they combine extremely high Reynolds numbers with additional time scales
  imposed by the rotation and three-dimensional effects. This implies that 
 resolved numerical solutions are too computationally expensive and investi
 gations in conventional wind tunnels are impossible due to the flow speeds
  and rotational rates needed in order to satisfy the dynamic similarity re
 quirements. At Princeton\, we achieve the conditions a large wind turbine 
 experiences\, experimentally\, by compressing the air around a model-scale
  turbine up to 238 bar. This yields conditions similar to those experience
 d by a field-sized turbine using a model that is only 20cm in diameter. Us
 ing pressure enables tests at high Reynolds numbers but at low velocities\
 , which implies that realistic non-dimensional frequencies can be tested e
 ven with such a small model. The power output and forces are investigated 
 over an unprecedented range of Reynolds numbers\, and it is shown that aer
 odynamic scale-effects persist at higher Reynolds numbers than previously 
 believed\, and that the boundary layer state is critical for turbine perfo
 rmance.\n\nMarcus Hultmark is associate professor in the Department of Mec
 hanical and Aerospace Engineering at Princeton University and director of 
 the Princeton Gas Dynamics Laboratory.  His research interests include a 
 variety of problems related to fluid mechanics\, with focus on problems in
 volving turbulence\, such as heat and mass transfer as well as drag reduct
 ion and wind energy. Experimental studies are combined with theoretical wo
 rk\, and an important part of his research program is the development and 
 evaluation of new sensing techniques to investigate these phenomena with h
 igh accuracy and resolution.  He was awarded the 2016 Air Force Young Inv
 estigator award\, the 2017 NSF Career award and in 2017 he received the No
 buhide Kasagi Award. He received his M.Sc. degree from Chalmers University
  in 2007 and his Ph.D. from Princeton University in 2011.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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