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Lecture on "Drone Based Experimental Investigation of Flow around Multi-MW Wind Farms in Flat and Complex Terrains" - 08 March 2018

Date and Venue Information:
08 March 2018, Seminar Room-104, 4:00 PM, Chemistry Department

Title of Seminar:
"Drone Based Experimental Investigation of Flow around Multi-MW Wind Farms in Flat and Complex Terrains" by Balaji Subramanian

Abstract
The aerodynamic characteristics of wakes in flat and (especially in) complex terrain have a profound impact on the energy yield of wind farms and on the fatigue loads experienced by wind turbines in the wind farm. The wake evolution measured downstream of multi-megawatt wind turbines located in flat and complex terrains will be presented here. The high-resolution measurements at full-scale Reynolds number conditions are made with an instrumented drone that is equipped with a suite of sensors, including a fast response aerodynamic probe, and detail the characteristics of the mean flow and turbulent kinetic energy (TKE) in the evolving wake. A short-time Fourier transform (STFT) based analysis method was used to derive time-localized TKE along the drone's trajectory. These details of the near-wake can have an important effect on the subsequent evolution of the wake and must be incorporated into the three-dimensional field wake models that are currently under intensive development. To my knowledge these are the first such measurements in full-scale experiments.
 
Brief Profile:
Dr. Balaji Subramanian is a postdoctoral researcher in Fluid Energy Science Lab (FESL) at University of California Santa Barbara (UCSB) since 2016. He received a BE in Mechanical Engineering from University of Madras in 2003, a M.Tech in Aerospace Engineering from IIT Kanpur in 2006 and a PhD from Swiss Federal Institute of Technology (ETH Zurich) in 2015. Prior to his PhD, he worked at JFWTC GE (Bangalore) as a CFD engineer in wind turbine division, and also as a CFD Engineer in KLA Tencor (Chennai). His primary research interests include experimental aerodynamics/fluid mechanics, wind turbines, drones, stratified flows and CFD. His PhD research work was featured on Swiss TV on ‘SF TV Einstein program’ and on Polish national television ‘TVP program’, and he was awarded the prestigious Swiss National Foundation fellowship to do his postdoctoral research at UCSB. He is an author of 4 journals, 7 conference papers and 2 patents.