Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity

Gang Wang; Yanguang Yang; Xiaowei Ma; Tao Jiang; Hongming Gong; Rongzong Kong

doi:doi:10.11648/j.ijass.20180603.11

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Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity

Gang Wang, Yanguang Yang, Xiaowei Ma, Tao Jiang, Hongming Gong, Rongzong Kong

Published in International Journal of Astrophysics and Space Science (Volume 6, Issue 3)

Received: 4 July 2018 Accepted: 16 July 2018 Published: 9 August 2018

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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.

Published in	International Journal of Astrophysics and Space Science (Volume 6, Issue 3)
DOI	10.11648/j.ijass.20180603.11
Page(s)	52-61
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2018. Published by Science Publishing Group

Keywords

Shock-Standoff Distance, Forward-Facing Cavity, Pressure Oscillation, Entropy Distribution

References

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[4]	Yadav, R. and U. Guven, Aerothermodynamics of a hypersonic vehicles with a forward facing parabolic cavity at nose. J Aerospace Engineering, 2014. 228 (10): p. 1863-1874.
[5]	Yadav, R. and U. Guven, Aerodynamic Heating of a Hypersonic Projectile with Forward-Facing ellipsoid Cavity at nose. Journal of Spacecraft and Rockets, 2015. 52 (1): p. 157-165.
[6]	Huebner, L. D. and L. R. Utreja, Mach 10 Bow-shock Behavior of a Forward-Facing Nose Cavity. Journal of Spacecraft and Rockets, 1993. 30 (3): p. 291-297.
[7]	Hartmann, J. and B. Troll, On a New Method for the Generation of Sound Waves. Phys. Rev., 1922. 20: p. 719-727.
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[9]	Sambamurthi, J. K., L. D. Huebner, and L. R. Utreja, Hypersonic Flow Over a Cone With Nose Cavity, in AIAA 19th Fluid Dynamics Plasma Dynamics and Lasers Conference1987: Hawaii.
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[14]	Billig, F. S., Shockwave shapes around spherical and cylindrical nosed bodies. Journal of Spacecraft and Rockets, 1967. 4 (6): p. 822-823.
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APA Style

Gang Wang, Yanguang Yang, Xiaowei Ma, Tao Jiang, Hongming Gong, et al. (2018). Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. International Journal of Astrophysics and Space Science, 6(3), 52-61. https://doi.org/10.11648/j.ijass.20180603.11

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ACS Style

Gang Wang; Yanguang Yang; Xiaowei Ma; Tao Jiang; Hongming Gong, et al. Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. Int. J. Astrophys. Space Sci. 2018, 6(3), 52-61. doi: 10.11648/j.ijass.20180603.11

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AMA Style

Gang Wang, Yanguang Yang, Xiaowei Ma, Tao Jiang, Hongming Gong, et al. Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. Int J Astrophys Space Sci. 2018;6(3):52-61. doi: 10.11648/j.ijass.20180603.11

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@article{10.11648/j.ijass.20180603.11,
  author = {Gang Wang and Yanguang Yang and Xiaowei Ma and Tao Jiang and Hongming Gong and Rongzong Kong},
  title = {Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity},
  journal = {International Journal of Astrophysics and Space Science},
  volume = {6},
  number = {3},
  pages = {52-61},
  doi = {10.11648/j.ijass.20180603.11},
  url = {https://doi.org/10.11648/j.ijass.20180603.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijass.20180603.11},
  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.},
 year = {2018}
}

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TY  - JOUR
T1  - Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity
AU  - Gang Wang
AU  - Yanguang Yang
AU  - Xiaowei Ma
AU  - Tao Jiang
AU  - Hongming Gong
AU  - Rongzong Kong
Y1  - 2018/08/09
PY  - 2018
N1  - https://doi.org/10.11648/j.ijass.20180603.11
DO  - 10.11648/j.ijass.20180603.11
T2  - International Journal of Astrophysics and Space Science
JF  - International Journal of Astrophysics and Space Science
JO  - International Journal of Astrophysics and Space Science
SP  - 52
EP  - 61
PB  - Science Publishing Group
SN  - 2376-7022
UR  - https://doi.org/10.11648/j.ijass.20180603.11
AB  - 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.
VL  - 6
IS  - 3
ER  -

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Author Information

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

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Plain Text BibTeX RIS

APA Style

Gang Wang, Yanguang Yang, Xiaowei Ma, Tao Jiang, Hongming Gong, et al. (2018). Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. International Journal of Astrophysics and Space Science, 6(3), 52-61. https://doi.org/10.11648/j.ijass.20180603.11

Copy | Download

ACS Style

Gang Wang; Yanguang Yang; Xiaowei Ma; Tao Jiang; Hongming Gong, et al. Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. Int. J. Astrophys. Space Sci. 2018, 6(3), 52-61. doi: 10.11648/j.ijass.20180603.11

Copy | Download

AMA Style

Gang Wang, Yanguang Yang, Xiaowei Ma, Tao Jiang, Hongming Gong, et al. Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity. Int J Astrophys Space Sci. 2018;6(3):52-61. doi: 10.11648/j.ijass.20180603.11

Copy | Download

@article{10.11648/j.ijass.20180603.11,
  author = {Gang Wang and Yanguang Yang and Xiaowei Ma and Tao Jiang and Hongming Gong and Rongzong Kong},
  title = {Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity},
  journal = {International Journal of Astrophysics and Space Science},
  volume = {6},
  number = {3},
  pages = {52-61},
  doi = {10.11648/j.ijass.20180603.11},
  url = {https://doi.org/10.11648/j.ijass.20180603.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijass.20180603.11},
  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.},
 year = {2018}
}

Copy | Download

TY  - JOUR
T1  - Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity
AU  - Gang Wang
AU  - Yanguang Yang
AU  - Xiaowei Ma
AU  - Tao Jiang
AU  - Hongming Gong
AU  - Rongzong Kong
Y1  - 2018/08/09
PY  - 2018
N1  - https://doi.org/10.11648/j.ijass.20180603.11
DO  - 10.11648/j.ijass.20180603.11
T2  - International Journal of Astrophysics and Space Science
JF  - International Journal of Astrophysics and Space Science
JO  - International Journal of Astrophysics and Space Science
SP  - 52
EP  - 61
PB  - Science Publishing Group
SN  - 2376-7022
UR  - https://doi.org/10.11648/j.ijass.20180603.11
AB  - 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.
VL  - 6
IS  - 3
ER  -

Copy | Download