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Boundary layer effects in optical measurements in gas dynamics.
Applied Optics
|February 19, 2010
Summary
This study introduces a method for 3D boundary corrections in 2D flow interferometry. The displacement thickness concept provides optical pathlength corrections, crucial for accurate flow analysis.
Area of Science:
- Fluid dynamics
- Optical metrology
Background:
- Interferometry is used to analyze fluid flows.
- Accurate analysis requires accounting for boundary layer effects.
Purpose of the Study:
- To develop a method for incorporating 3D boundary corrections into 2D flow interferogram analysis.
- To calculate effective optical pathlength using a displacement thickness concept.
Main Methods:
- Calculating effective optical pathlength.
- Deriving expressions for optical pathlength correction in laminar and turbulent boundary layers.
- Applying the displacement thickness concept for isoenergetic or diabatic flow.
Main Results:
- Expressions for optical pathlength correction are provided for laminar and turbulent boundary layers.
- An exact expression for the turbulent case was derived.
- Corrections were found to be approximately 10%.
Conclusions:
- The developed method effectively corrects for 3D boundary effects in 2D flow interferometry.
- The displacement thickness concept offers a viable approach for optical pathlength correction.
- The findings are significant for improving the accuracy of fluid flow measurements.
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