Drag and Noise Reduction of Flatback Airfoil by Span-wise Wavy Trailing Edge

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dc.contributor.advisorBaeder, James Den_US
dc.contributor.authorYang, SeungJoonen_US
dc.contributor.departmentAerospace Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2019-06-20T05:35:23Z
dc.date.available2019-06-20T05:35:23Z
dc.date.issued2019en_US
dc.description.abstractThe flatback airfoil is a promising idea for future large wind turbine blade structure design; however, it causes notable drag increase and low frequency tonal noise due to the presence of span-wise coherent standing flow and Karman vortex shedding at the trailing edge. Current dissertation proposes a span-wise wavy trailing edge design as a solution to flatback airfoil drag and noise, and provides relevant CFD results. Proposed span-wise wavy trailing edge prevents the span-wise coherent standing flow and vortex shedding, and results in a decrease of the tonal noise and pressure drag of the airfoil. Delayed Detached Eddy Simulation is employed in HPC environments. In-house developed N-S solvers, OVERTURNS (CPU-based) and GPURANS3D (GPGPU) are used for the computation. A design parametric study for the span-wise wavy trailing edge is conducted in the first half of the dissertation. Aerodynamic and aeroacoustic performance of a particular flatback airfoil (FB3500-1750, tTE is 17.5% of a chord length) and various span-wise wavy trailing edge modifications are investigated, regarding the influence of the major wave design parameters. A total of 16 design variations of the wavy trailing edge are investigated. For a Reynolds number 666,000 and Mach number 0.3, the best trailing edge wave design is a combination of the less portion - more than 0.25c length - shallow wave depth; the best design reduces 60% (maximum) of the flatback airfoil with only 7% lift loss, and results in about 150% (maximum) of lift/drag ratio increase. Measured tonal noise is also reduced by about 20-25dB(SPL) with the best performance design. In the second half of the dissertation, the isolated rotor simulation is performed for a straight-flat trailing edge wind turbine blade and its wavy trailing edge modification. In the simulation, the Blunt-Wavy trailing edge (a combination of trailing edge augmentation and wavy modification) is proposed and applied at the inboard of baseline blade (SNL100-03FB). Applying the best performance wavy design, overall turbine power generation is increased by 2.62% and tonal noise is decreased by 5-15dB.en_US
dc.identifierhttps://doi.org/10.13016/z2f2-iysh
dc.identifier.urihttp://hdl.handle.net/1903/21992
dc.language.isoenen_US
dc.subject.pqcontrolledAerospace engineeringen_US
dc.subject.pquncontrolledAcoustic Noise reductionen_US
dc.subject.pquncontrolledAerodynamic Drag reductionen_US
dc.subject.pquncontrolledComputational Fluid Dynamicsen_US
dc.subject.pquncontrolledDelayed Detached Eddy Simulationen_US
dc.subject.pquncontrolledSpan-wise wavy trailing edgeen_US
dc.subject.pquncontrolledWind turbine aerodynamicsen_US
dc.titleDrag and Noise Reduction of Flatback Airfoil by Span-wise Wavy Trailing Edgeen_US
dc.typeDissertationen_US

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