Characterization and Control of Carbon Dioxide Seed Particles in Particle Image Velocimetry

<p>Carbon Dioxide (CO2) particles exiting from a variety of feed tube and shroud configurations and in combination with varying volumetric flow rates of purge air were measured using a laser diffraction device. CO2 particles were then injected into the stilling chamber of two open-circuit blow down supersonic wind tunnels to obtain PIV measurements. A ten degree ramp placed in the test section of one wind tunnel produced a shock wave which allowed for the characterization of the time response of the CO2 particles as they crossed the shock wave. This time response was compared with theoretical time responses of varying diameter CO2 particles in order to characterize the spherical diameter of the actual CO2 particles. Purge air was used to demonstrate the ability to alter the size of particles by altering the time response of the particles across the shock wave. A scale up was performed to demonstrate the applicability of the clean seeding technique to different size wind tunnels. Initial particle measurements demonstrate the ability to control the size of CO2 particles which is backed up by actual PIV measurements confirming size characterization.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>