Optical Diagnostics for Flow Control on Small Wings
Technical Report,01 Jul 2015,30 Jun 2016
University of Southern California Los Angeles United States
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The original proposal and purpose of this special grant were to replace a laser that had suddenly become unfixable. A new, dual-head NdYAG laser has been purchased, installed, and heavily-used in essential work. Two most recent investigations concern the flow over a complex wing-body-tail geometry, and the flow over a simple, standard NACA 0012 airfoil at moderate Re, when the flow properties are found to be responsible for very surprising force balance data, including negative lift at positive angle of attack. These are quite extensive studies and sample data only are given in this report. Full details will be published and given in formal reports. The laser has done exactly what we had planned, and extensive PIV-based investigations that would have taken months can now be done in one week.