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http://dx.doi.org/10.5139/JKSAS.2016.44.12.1017

Two Visualization Techniques Using Smoke-wire and Micro Water-droplets and Their Applications to Vortex Flows  

Sohn, Myong Hwan (Department of Aeronautical and Mechanical Engineering, Cheongju University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.44, no.12, 2016 , pp. 1017-1026 More about this Journal
Abstract
The present paper describes the two off-surface visualization techniques and their application examples to vortex flows. One of the two visualization techniques is the classical smoke-wire technique, and the other is the visualization technique using the micro water-droplets generated by the home-style ultrasonic humidifier. The smoke-wire technique has the limit of air flow speed (about 5 m/sec for 0.07 mm-diameter wire) and the pollution problem, but it produces very fine and clear streak line sheet. It is applied to visualize the wing-tip vortices of a 3-dimensional wing. The micro water-droplet technique has the larger limit of air flow speed (above 10 m/sec) and is free from pollution and toxic problems compared to the smoke-wire technique. It is successfully applied to visualize the complex vortex system of a double-delta wing with an apex strake.
Keywords
Flow visualization; Smoke-wire; Ultrasonic humidifier; Micro water-droplets; Vortex flow;
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