Photogrammetric Measurement of Recession Rates of Low Temperature Ablators Subjected to High Speed Flow

Idioma: inglés

Editorial: Legare Street Press Nov 2012, 2012

1288332513 / 9781288332519

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Neuware - This research advances a technique to simulate high temperature/high speed effects in a high speed/low temperature environment and to capture recession of the test article in three-dimensions. A method of fabricating dry ice test articles was developed, and the AFIT Mach 3 pressure-vacuum wind tunnel was used in combination with the dry ice test articles to collect three-dimensional ablation data for models of different shapes at stagnation pressures ranging from approximately 0.4 atm to 3 atm and stagnation temperatures equivalent to room temperature. High speed Schlieren photography was used for visualization, and the three dimensional shape change was quantified with sub-millimeter accuracy using laser dot photogrammetry. Experimental results for multiple shapes were compared to those computed using a computational model called ACFD. The ACFD model employed a finite-volume approach to solving the (3-D) Navier-Stokes equations with the gas assumed to be at equilibrium while employing an implicit solver accounting for the material response. By and large, the computational approach was validated for the conditions tested herein. Measurement of ablation rates at the stagnation point yielded approximate values of convective heat transfer rate when conduction through the solid is assumed negligible. The results of this analysis compared favorably to a variety of extensions of the Fay-Riddell correlation given in the literature. Paths for further research were selected and discussed.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.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.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.

N° de ref. del artículo 9781288332519

Título
Photogrammetric Measurement of Recession Rates of Low Temperature Ablators Subjected to High Speed Flow
Autor
David W. Callaway
Editorial
Legare Street Press Nov 2012
Año de publicación
2012
Estado
Neu
Encuadernación
Taschenbuch
Idioma
inglés
ISBN 10
1288332513
ISBN 13
9781288332519
Peso del artículo
414 gramos
Dimensiones
234x156x15 mm

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