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Investigating The Effect Of An Upstream Spheroid On Tandem Hydrofoils, Joel Tynan Guerra
Investigating The Effect Of An Upstream Spheroid On Tandem Hydrofoils, Joel Tynan Guerra
Master's Theses
This thesis documents a series of three dimensional unsteady Reynolds Averaged Navier-Stokes CFD simulations used to investigate the influence of an upstream prolate spheroid body on tandem pitching hydrofoils. The model is validated by performing separate CFD simulations on the body and pitching hydrofoils and comparing results to existing experimental data. The simulations were run for a range of Strouhal numbers (0.2-0.5) and phase differences (0-π). Results were compared to identical simulations without an upstream body to determine how the body affects thrust generation and the unsteady flow field.
The combined time-averaged thrust increases with Strouhal number, and is highest …
Novel Inverse Airfoil Design Utilizing Parametric Equations, Kevin A. Lane
Novel Inverse Airfoil Design Utilizing Parametric Equations, Kevin A. Lane
Master's Theses
The engineering problem of airfoil design has been of great theoretical interest for almost a century and has led to hundreds of papers written and dozens of methods developed over the years. This interest stems from the practical implications of airfoil design. Airfoil selection significantly influences the application's aerodynamic performance. Tailoring an airfoil profile to its specific application can have great performance advantages. This includes considerations of the lift and drag characteristics, pitching moment, volume for fuel and structure, maximum lift coefficient, stall characteristics, as well as off-design performance.
A common way to think about airfoil design is optimization, the …