Laser-based optical fluid velocity measurement

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The primary objective of the research in this proposal is to apply laser based optical flow measurement techniques such as flow visualization, laser Doppler velocimetry, and particle image velocimetry (PIV) to make detailed measurements of the velocity fields developed in a variety of fluid mechanic systems.  Examples of such systems include the internal flow patterns of rotating fluid machinery (pumps and fans) or large scale flows.  Initial research will focus on the PIV method, through the continued application of PIV for measurement of the internal flow characteristics of rotating impellers at off design conditions.  Velocity measurements in the internal rotating passages are critical to determining the overall performance of the machine. Velocity data must be collected under various operating conditions in order to understand the behaviour of the flow, provide validation data for computational fluid dynamic (CFD) simulations of the flow and reliably quantify the above effects for inclusion in new tools for design. Relative to information that could previously be obtained using traditional, intrusive velocity probes, the new, time resolved, planar velocity maps obtained using PIV have allowed significant advances in characterization and interpretation of key attributes of these rotating flows.