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Experimental investigation of surface flow pattern on truncated cones in Mach 5 flow: influence of truncation ratio

Experimental investigation of surface flow pattern on truncated cones in Mach 5 flow: influence of truncation ratio
Experimental investigation of surface flow pattern on truncated cones in Mach 5 flow: influence of truncation ratio
The flow characteristics on a truncated cone with a cylinder were experimentally investigated in a Mach 5 flow with a Reynolds number 3.8 × 105, based on the cylindrical diameter. Two different truncation ratios of 0.5 and 0.7 were used. The incidence angle varied from −12 to 0° with 3° intervals to investigate the influence of the truncation ratio on the surface flow pattern. The measurement techniques: unsteady pressure-sensitive paint (anodized aluminium method), color Schlieren photography, and surface oil flow were used. It was found that the distance of the external shock wave from the conical surface depends on the truncation ratio, and the surface pressure on the conical portion increases when the external shock wave moves closer to the model surface. The “external” shock wave denotes a detached shock wave and the “internal” one is the shock wave formed between the detached bow shock wave and the model surface. In the higher truncation ratio at the higher incidence angle, the internal shock wave induced by the flow separation on the conical surface impinges on the external shock wave, which results in its reflection. This reflection leads to the pressure increase on the model surface. On the other hand, this reflection does not appear in the lower truncation ratio. In spite of the different truncation ratios, the angle of the internal shock wave is identical at the same incidence angle. From the oil flow results, the wall shear stress on the leeward conical surface is lager in the higher truncation ratio model.
0894-1777
396-405
Ukai, Takahiro
b83787a3-b48e-4c83-8ad1-9d6c15ef8a7b
Zare-Behtash, Hossein
74be9b97-cb09-49c6-9f75-7ec58c0dd16c
Kontis, Konstantinos
8e534eab-6495-4dcb-ab48-e2a8906bcd8a
Yang, Leichao
e07c9181-db66-44ee-9309-dda7b92c51c2
Erdem, Erinc
6f4133a8-8084-4286-b93d-e303bc375d8d
Ukai, Takahiro
b83787a3-b48e-4c83-8ad1-9d6c15ef8a7b
Zare-Behtash, Hossein
74be9b97-cb09-49c6-9f75-7ec58c0dd16c
Kontis, Konstantinos
8e534eab-6495-4dcb-ab48-e2a8906bcd8a
Yang, Leichao
e07c9181-db66-44ee-9309-dda7b92c51c2
Erdem, Erinc
6f4133a8-8084-4286-b93d-e303bc375d8d

Ukai, Takahiro, Zare-Behtash, Hossein, Kontis, Konstantinos, Yang, Leichao and Erdem, Erinc (2016) Experimental investigation of surface flow pattern on truncated cones in Mach 5 flow: influence of truncation ratio. Experimental Thermal and Fluid Science, 81, 396-405. (doi:10.1016/j.expthermflusci.2016.09.016).

Record type: Article

Abstract

The flow characteristics on a truncated cone with a cylinder were experimentally investigated in a Mach 5 flow with a Reynolds number 3.8 × 105, based on the cylindrical diameter. Two different truncation ratios of 0.5 and 0.7 were used. The incidence angle varied from −12 to 0° with 3° intervals to investigate the influence of the truncation ratio on the surface flow pattern. The measurement techniques: unsteady pressure-sensitive paint (anodized aluminium method), color Schlieren photography, and surface oil flow were used. It was found that the distance of the external shock wave from the conical surface depends on the truncation ratio, and the surface pressure on the conical portion increases when the external shock wave moves closer to the model surface. The “external” shock wave denotes a detached shock wave and the “internal” one is the shock wave formed between the detached bow shock wave and the model surface. In the higher truncation ratio at the higher incidence angle, the internal shock wave induced by the flow separation on the conical surface impinges on the external shock wave, which results in its reflection. This reflection leads to the pressure increase on the model surface. On the other hand, this reflection does not appear in the lower truncation ratio. In spite of the different truncation ratios, the angle of the internal shock wave is identical at the same incidence angle. From the oil flow results, the wall shear stress on the leeward conical surface is lager in the higher truncation ratio model.

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More information

Accepted/In Press date: 20 September 2016
e-pub ahead of print date: 21 September 2016
Published date: 20 November 2016

Identifiers

Local EPrints ID: 490950
URI: http://eprints.soton.ac.uk/id/eprint/490950
ISSN: 0894-1777
PURE UUID: ed18d632-8bba-4fe0-a09d-924c4f770c32
ORCID for Hossein Zare-Behtash: ORCID iD orcid.org/0000-0002-4769-4076

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Date deposited: 10 Jun 2024 16:40
Last modified: 11 Jun 2024 02:09

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Contributors

Author: Takahiro Ukai
Author: Hossein Zare-Behtash ORCID iD
Author: Konstantinos Kontis
Author: Leichao Yang
Author: Erinc Erdem

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