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Proceedings Paper

Modeling of particle imaging through shock waves
Author(s): Gerrit E. Elsinga; Bas W. van Oudheusden; Fulvio Scarano
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Paper Abstract

In compressible flows particle imaging, as done in Particle Image Velocimetry (PIV), is far from trivial. The inhomogeneous refractive index field can cause aero-optical aberrations including blurring of the image, especially near optical interfaces such as shock waves. The understanding of the process causing particle image blur (or blurring of the point spread function of the imaging system) is important in order to assess the measurement accuracy of optical measurement systems, such as PIV. A model for imaging through a shock wave is presented to determine the characteristic shape of blurred particle images when imaged across shock waves. The conjectured model is validated through a PIV experiment, where particle image recordings of the flow across a steady oblique shock wave are obtained in a supersonic wind tunnel. The parametric study focuses on two dominating parameters: 1) the angle between the viewing axis and the shock wave; 2) the numerical aperture of the imaging optics.

Paper Details

Date Published: 18 August 2005
PDF: 11 pages
Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 58670M (18 August 2005); doi: 10.1117/12.616687
Show Author Affiliations
Gerrit E. Elsinga, Delft Univ. of Technology (Netherlands)
Bas W. van Oudheusden, Delft Univ. of Technology (Netherlands)
Fulvio Scarano, Delft Univ. of Technology (Netherlands)


Published in SPIE Proceedings Vol. 5867:
Optical Modeling and Performance Predictions II
Mark A. Kahan, Editor(s)

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