Nonequilibrium Turbulence Study Using Holographic Particle Image Velocimetry
Abstract
The primary objective of this project involved the development of a three-dimensional flow field measurement tool, viz holographic particle image velocimetry (HPIV), for applications in turbulent and complex flows. Holography is a 3D imaging process that instantaneously captures the volumetric information of a test object. A fully automated off-axis HPIV system has on an injection-seeded dual-pulsed YAG laser and 3D data processing software has been implemented in the Laser Flow Diagnostics Lab (LFD). In this system, 90-degree particle scattering, dual reference beams, in situ reconstruction/data processing, and 3D velocity extraction based on a fast "Concise Cross Correlation" (CCC) algorithm are utilized. To quantify and characterize the HIPIV technique for diagnosing three-dimensional flow fields, the technique has been applied to both a simulated flow to provide accuracy analysis and in real flows to test its feasibility and functionality. The off-axis HPIV system was tested in an acoustically excited air jet and the wake of a surface-mounted tab in a water channel flow, giving instantaneous 3D velocity fields for both flows. The development of HPIV was an interactive process driven by the pursuit of answers to the critical questions in nonequilibrium turbulence. These critical questions imposed technical requirements, design guidelines, and guided the HPIV evolution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2001
- Accession Number
- ADA397780
Entities
People
- Byron C Jones
- Hui Meng
Organizations
- Kansas State University