Drag resolution of a PIV wake rake for transiting models

Conference paper (2018)

Authors

W. Terra Aerodynamics - Aerospace Engineering
A. Sciacchitano Aerodynamics - Aerospace Engineering
F. Scarano Flow Physics and Technology , Aerodynamics - Aerospace Engineering
B.W. van Oudheusden Aerodynamics - Aerospace Engineering
Research Group
Aerodynamics (Aerospace Engineering) (TU Delft)
Copyright: © 2018 W. Terra, A. Sciacchitano, F. Scarano, B.W. van Oudheusden
HFSB Helium-filled soap bubbles Measurement uncertainty Aerodynamic drag PIV wake rake Moving sphere
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Published Date

2018

Language

English

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Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Aerodynamics

Abstract

The accuracy of the “PIV wake rake” method to measure the drag of transiting objects is evaluated. Tomographic Particle Image Velocimetry measurements are conducted on a sphere towed at different speeds, within a Reynolds number range where the drag coefficient is constant. In contrast to PIV wake rake application on steady models in wind tunnels, where the upstream conditions can be accurately controlled and known a priori, measurement of the flow field prior to the passage of the model is essential for an accurate estimation of the drag for towed models when control of the undisturbed conditions is more challenging. The drag resolution of the technique is estimated to prospect the use of the technique in large scale applications. A resolution of approximately 20 drag counts is obtained which is coarser than wind tunnel experiments but comparable to techniques used for field measurements.