Drag resolution of a PIV wake rake for transiting models

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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.
Original languageEnglish
Title of host publicationProceedings of the 19th international symposium on application of laser and imaging techniques to fluid mechanics
Number of pages12
Publication statusPublished - 2018
EventLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 16 Jul 201819 Jul 2018
Conference number: 19
http://www.lisbon-lasersymposium.org/LXLASER2018

Conference

ConferenceLXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Abbreviated titleLXLASER2018
Country/TerritoryPortugal
CityLisbon
Period16/07/1819/07/18
Internet address

Keywords

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

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