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 language | English |
---|---|
Title of host publication | Proceedings of the 19th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics |
Place of Publication | Lisboa, Portugal |
Publisher | Instituto Superior Técnico |
Pages | 3070-3078 |
Publication status | Published - 2018 |
Event | LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal Duration: 16 Jul 2018 → 19 Jul 2018 Conference number: 19 http://www.lisbon-lasersymposium.org/LXLASER2018 |
Conference
Conference | LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics |
---|---|
Abbreviated title | LXLASER2018 |
Country/Territory | Portugal |
City | Lisbon |
Period | 16/07/18 → 19/07/18 |
Internet address |
Keywords
- HFSB
- neutrally buoyant particles
- large-scale PIV