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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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Systematic errors in optical-flow velocimetry for turbulent flows and flames.

J Fielding, M B Long, G Fielding

|March 22, 2008

Summary

Optical-flow (OF) velocimetry offers an unseeded alternative for turbulent flow measurements. However, this study reveals systematic discrepancies and directional errors compared to particle-image velocimetry, highlighting current OF technique limitations.

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Area of Science:

Fluid dynamics
Optical measurement techniques

Background:

Optical-flow (OF) velocimetry is an unseeded technique for extracting velocity from 2D images.
It serves as an alternative to particle-image velocimetry (PIV) in turbulent flow analysis.

Purpose of the Study:

To evaluate the performance of OF velocimetry by direct comparison with PIV.
To identify limitations of current OF techniques in turbulent flows and flames.

Main Methods:

Simultaneous measurements using OF velocimetry and PIV in isothermal turbulent flow and a turbulent flame.
Application of two region-based correlation OF algorithms.
Acetone-OH laser-induced fluorescence for flame visualization.
Experimental setup for simultaneous Mie scattering and LIF on a single CCD camera.

Main Results:

Systematic discrepancies between OF and PIV increase with radial distance from the centerline.
Directional errors exceeding 10 degrees are consistently observed across all radial positions.
Identified limitations in current OF techniques, particularly away from the flow centerline.

Conclusions:

Current OF velocimetry techniques exhibit limitations in accuracy and directional fidelity compared to PIV.
Further development is needed to address discrepancies observed at radial positions and improve directional accuracy.
The described experimental setup enables robust validation studies for velocimetry techniques.