Eric Limacher
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View article: Towards a general theory of accelerating foils in the attached-flow regime
Towards a general theory of accelerating foils in the attached-flow regime Open
Closed-form expressions for aerodynamic force on an accelerating aerofoil were presented in the 1930s, relating instantaneous force to geometric and kinematic parameters under the following assumptions: a thin aerofoil, small-amplitude mot…
View article: Some effects of flow expansion on the aerodynamics of horizontal-axis wind turbines
Some effects of flow expansion on the aerodynamics of horizontal-axis wind turbines Open
The flow upwind of an energy-extracting horizontal-axis wind turbine expands as it approaches the rotor, and the expansion continues in the vorticity-bearing wake behind the rotor. The upwind expansion has long been known to influence the …
View article: A stereoscopic PIV system for the Princeton Superpipe
A stereoscopic PIV system for the Princeton Superpipe Open
Herein, we describe the design and testing of a stereoscopic PIV system uniquely adapted for the high pressure environment of the Princeton Superpipe. The Superpipe is a recirculating pipe facility that utilizes compressed air as the worki…
View article: Some effects of flow expansion on the aerodynamics of horizontal-axis wind turbines
Some effects of flow expansion on the aerodynamics of horizontal-axis wind turbines Open
Upwind of an energy-extracting horizontal-axis wind turbine, the flow expands as it approaches the rotor, and the expansion continues in the vorticity-bearing wake behind the rotor. The upwind expansion has long been known to influence the…
View article: An impulse-based derivation of the Kutta–Joukowsky equation for wind turbine thrust
An impulse-based derivation of the Kutta–Joukowsky equation for wind turbine thrust Open
Using the concept of impulse in control volume analysis, we derive general expressions for wind turbine thrust in a constant, spatially uniform wind. The absence of pressure in the impulse equations allows for their application in the near…
View article: Derivation of an Impulse Equation for Wind Turbine Thrust
Derivation of an Impulse Equation for Wind Turbine Thrust Open
Using the concept of impulse in control volume (CV) analysis, we derive a new equation for steady wind turbine thrust in a constant, spatially uniform wind. This equation contains the circumferential velocity and tip speed ratio. We determ…
View article: Added Mass and Vortical Impulse: Theory and Experiment
Added Mass and Vortical Impulse: Theory and Experiment Open
The classical decomposition of aerodynamic force into added-mass and circulatory components is derived under the assumption of inviscid flow. In the present thesis, this decomposition is shown to be valid for viscous flows. The classical a…
View article: Samara-Seed Aerodynamics
Samara-Seed Aerodynamics Open
Samaras are tree seeds that spontaneously rotate about the vertical axis as they fall. This flight pattern, referred to as autorotation, generates aerodynamic lift to slow a samara’s descent. In this thesis, samara flight is studied in ste…