Drag resolution of a PIV wake rake for transiting models

Drag resolution of a PIV wake rake for transiting models

Terra, W. (TU Delft Aerodynamics)
Sciacchitano, A. (TU Delft Aerodynamics)
Scarano, F. (TU Delft Flow Physics and Technology; TU Delft Aerodynamics)
van Oudheusden, B.W. (TU Delft Aerodynamics)

Flow Physics and Technology

2018

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.

PIV wake rake
HFSB
aerodynamic drag
moving sphere
measurement uncertainty
helium-filled soap bubbles

http://resolver.tudelft.nl/uuid:94c88571-f714-4169-9c84-184805822046

Proceedings of the 19th international symposium on application of laser and imaging techniques to fluid mechanics

LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 2018-07-16 → 2018-07-19, Lisbon, Portugal

Institutional Repository

conference paper

© 2018 W. Terra, A. Sciacchitano, F. Scarano, B.W. van Oudheusden