Two-dimensional particle image velocimetry with electro-optical image shifting in an internal combustion engine

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Abstract
Particle Image Velocimetry (PIV), has been used to make 2D velocity measurements over the cylinder cross section of a reciprocating internal-combustion engine. Electrooptical image shifting has been demonstrated previously as a viable means to remove the directional ambiguity inherent in PIV. A two-laser system was developed to produce two, colinear, cross- polarized laser beams, which are required for the image shifting technique. Particle scattering resulted in some depolarization of the laser light. This was shown to result in erroneous vectors and a zero bias at low velocities. Techniques to minimize the depolarization problems are discussed. It is demonstrated that the uncertainty in this method is small enough to permit resolving in-cylinder engine turbulence.

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