Volumetric measurements of a self-similar adverse pressure gradient turbulent boundary layer using single-camera light-field particle image velocimetry

Zhou Zhao, John Buchner, Junfei Ding, Shengxian Shi, Callum Atkinson, Julio Soria

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

As a novel volumetric particle image velocimetry technique, single-camera light-field PIV (LF-PIV) is able to reconstruct three-dimensional flow fields with a single camera. The merits of LF-PIV lie in its concise hardware setup and minimum optical access requirement, its capability has been proved in many flow scenarios. In this study, LF-PIV is used to measure a self-similar adverse pressure gradient turbulent boundary layer (APG-TBL). Experiments were performed in a large water tunnel at the Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC), Monash University. 20 independent batches of light-field PIV images were captured for both inner and outer flow, each consisting of 250 instantaneous image pairs. Instantaneous 3D velocity fields were reconstructed with the GPU accelerated DRT-MART and 3D cross-correlation methods and compared with two-dimensional PIV (2D-PIV) results. Initial results show that though limited by the experiment conditions and PIV algorithms developed in 2016, we still can have similar accuracy to 2D-PIV near and above the boundary layer. With the volumetric calibration method that compensates optical distortions caused by lens defect and misalignment between the micro-lens array (MLA) and image sensor, the resolution of LF-PIV is sure to have a large improvement.
Original languageEnglish
Title of host publicationProceedings of the 19th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics
Place of PublicationLisboa, Portugal
PublisherInstituto Superior Técnico
Pages3070-3078
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
CountryPortugal
CityLisbon
Period16/07/1819/07/18
Internet address

Keywords

  • HFSB
  • neutrally buoyant particles
  • large-scale PIV

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