Browsing NTNU Open by Author "Li, Leon"
Now showing items 1-11 of 11
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Comparing Hot-Wire Measurements and Particle Image Velocimetry of Turbulence Fields Generated by an Active Grid
Neunaber, Ingrid Johanne; Asadi, Masoud; Li, Leon; Hearst, Robert Jason (Chapter, 2024) -
In the wake of turbulence: A study on the effects of freestream turbulence on the flow around simple and complex geometries
Li, Leon (Doctoral theses at NTNU;2022:155, Doctoral thesis, 2022)With the growing demand of global energy consumption and a need to reduce pollution caused by energy production from fossil fuels, renewable sources of energy are becoming increasingly necessary for the future sustainable ... -
The influence of freestream turbulence on the temporal pressure distribution and lift of an airfoil
Li, Leon; Hearst, R. Jason (Journal article; Peer reviewed, 2021)To gain insight on how freestream turbulence (FST) affects the aerodynamics of an airfoil in a systematic manner, the present study investigates a NREL S826 airfoil subjected to seven different incoming flows with varying ... -
The influence of water turbulence on surface deformations and the gas transfer rate across an air–water interface
Bullee, Pim Adriaan; Weichert, Stefan; Nore, Astri; Li, Leon; Ellingsen, Simen Andreas Ådnøy; Hearst, Robert Jason (Journal article; Peer reviewed, 2024)We present experimental results of a study on oxygen transfer rates in a water channel facility with varying turbulence inflow conditions set by an active grid. We compare the change in gas transfer rate with different ... -
The Near- and Intermediate-Wakes of Cylinders Under the Influence of Freestream Turbulence
Li, Leon; Hearst, Robert Jason (Chapter, 2024) -
PIV of the Flow Over a NREL S826 Airfoil Subjected to Different Ice Accretions
Vinnes, Magnus Kyrkjebø; Li, Leon; Hearst, R. Jason (Chapter, 2019). The results have been compared to previously acquired force measurements. For streamlined ice accretions, increased surface roughness and changes to the combined airfoil-ice geometry lead to reduced aerodynamical performance ... -
Spatial development of a turbulent boundary layer subjected to freestream turbulence
Jooss, Yannick; Li, Leon; Bracchi, Tania; Hearst, Robert Jason (Peer reviewed; Journal article, 2021)The spatial development of a turbulent boundary layer (TBL) subjected to freestream turbulence (FST) is investigated experimentally in a water channel for friction Reynolds numbers up to Reτ=5060. Four different FST ... -
The effect of active grid-generated freestream turbulence on an aeroelastic NACA4412 airfoil
Cantan, Jean Jacques Christian Georges (Master thesis, 2021)Aerodynamiske og strukturelle egenskaper til en NACA4412-bæreflate har blitt undersøkt eksperimentelt i den store lukkede vindtunnelen ved NTNU. Hensikten var å få innsikt i hvordan freestream-turbulens, som ble generert ... -
The Mean Velocity of the Near-Field of a Lab-Scale Wind Turbine in Tailored Turbulent Shear Flows
Li, Leon; Hearst, R. Jason; Ganapathisubramani, Bharathram (Chapter, 2019)This study investigated the mean velocity of the near-field wake of a lab-scale wind turbine subjected to seven different incoming turbulent shear flows through particle image velocimetry. An active grid was used to generate ... -
The near-field of a lab-scale wind turbine in tailored turbulent shear flows
Li, Leon; Hearst, R. Jason; Ferreira, Manuel A.; Ganapathisubramani, Bharathram (Journal article; Peer reviewed, 2020)Real wind turbines experience a wide range of turbulent shear flows that naturally occur within the atmospheric boundary layer, however, these are often difficult to simulate in experiments. An active grid was used to ... -
Volumetric visualization of vanishing vortices in wind turbine wakes
Hillestad, Johannes Næsset; Yadala Venkata, Srikar; Neunaber, Ingrid Johanne; Li, Leon; Hearst, Robert Jason; Worth, Nicholas Alexander (Journal article; Peer reviewed, 2024)Volumetric velocimetry is used to investigate the evolution of tip vortices in the wake of a model wind turbine. The power spectral density of streamwise velocity fluctuations is estimated at several downstream locations, ...