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Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity
International Journal of Astrophysics and Space Science
Volume 6, Issue 3, June 2018, Pages: 52-61
Received: Jul. 4, 2018; Accepted: Jul. 16, 2018; Published: Aug. 9, 2018
Volume 6, Issue 3, June 2018, Pages: 52-61
Received: Jul. 4, 2018; Accepted: Jul. 16, 2018; Published: Aug. 9, 2018
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Authors
Gang Wang, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Yanguang Yang, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Xiaowei Ma, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Tao Jiang, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Hongming Gong, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Rongzong Kong, Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mian Yang, China
Abstract
Experiments are performed on a cylinder with a forward-facing cavity at M∞ = 10 in the FD-14A shock tunnel. The shock-standoff distance and oscillation characteristics are recorded by a high-speed movie, and the dynamic pressure transducer is used to capture the unsteady signal of cavity base. Based on experimental and numerical results, a prediction method for estimating the shock-standoff distance is proposed. Results of shock-standoff distance and oscillation frequency are obtained for experiments in the shock tunnel. The predicted oscillation frequency is in accordance with experimental results. Furthermore, the relation of shock shape and the entropy increase are combined to obtain the characteristics of entropy distribution. As the shock-shape of flat-nosed cylinders is more liable to be influenced than blunt-nosed cylinders with increasing Mach number, the location of the extreme value moves to the surface as the Mach number increases for flat-nosed cylinders, while it remains the identical location for blunt-nosed cylinders.
Keywords
Shock-Standoff Distance, Forward-Facing Cavity, Pressure Oscillation, Entropy Distribution
To cite this article
Gang Wang,
Yanguang Yang,
Xiaowei Ma,
Tao Jiang,
Hongming Gong,
Rongzong Kong,
Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity, International Journal of Astrophysics and Space Science.
Vol. 6, No. 3,
2018, pp. 52-61.
doi: 10.11648/j.ijass.20180603.11
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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