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On the application of non-standard rainbow schlieren technique upon supersonic jets

On the application of non-standard rainbow schlieren technique upon supersonic jets
On the application of non-standard rainbow schlieren technique upon supersonic jets
A quantitative rainbow schlieren study was conducted on an over-expanded jet at nozzle pressure ratio of 2.8, based on two different schlieren set-ups: the standard z-type and a single-mirror schlieren set-up. The technique used a single, weak focal-length lens placed in the field of view of the system to provide the calibration information required for the extraction of the quantitative data. In the case of the single-mirror set-up, the calibration image required further post-processing procedures to take into account the double refraction experienced by the light. Density gradients were calculated using Abel transform and compared to validated reference data. Results indicate that the single-mirror set-up is able to improve prediction of the density gradient field as compared to the standard z-type schlieren, due to its inherent property of higher sensitivity. The study has shown that the single-mirror set-up performs on average better than the standard z-type system, yielding an overall averaged error of ± 20%, with localized values as low as ± 5% where the shock cell structure is clearly defined, with respect to the validated reference data. At the same time, both systems perform poorly in regions where the flow structure displays poor image contrast.
1343-8875
383-393
Mariani, R
d7dc30ee-83ae-46d9-8ee8-a9370f7f00af
Lim, Desmond
82a7e7e8-2ade-44f8-a342-a99c2b9339c4
Zang, B.
ca544af2-1b0f-4a1a-9f9b-1380383ab5ae
U S, Vevek
b56c6e11-f6d0-4d57-820c-fc75e77b2d0a
New, T.H.
f35405df-ad65-4b96-9d6b-06afebdd43a8
Cui, Y D
eed2f6b6-0ac8-4e15-bd8e-1064a93713f4
Mariani, R
d7dc30ee-83ae-46d9-8ee8-a9370f7f00af
Lim, Desmond
82a7e7e8-2ade-44f8-a342-a99c2b9339c4
Zang, B.
ca544af2-1b0f-4a1a-9f9b-1380383ab5ae
U S, Vevek
b56c6e11-f6d0-4d57-820c-fc75e77b2d0a
New, T.H.
f35405df-ad65-4b96-9d6b-06afebdd43a8
Cui, Y D
eed2f6b6-0ac8-4e15-bd8e-1064a93713f4

Mariani, R, Lim, Desmond, Zang, B., U S, Vevek, New, T.H. and Cui, Y D (2020) On the application of non-standard rainbow schlieren technique upon supersonic jets. Journal of Visualization, 23, 383-393. (doi:10.1007/s12650-020-00637-y).

Record type: Article

Abstract

A quantitative rainbow schlieren study was conducted on an over-expanded jet at nozzle pressure ratio of 2.8, based on two different schlieren set-ups: the standard z-type and a single-mirror schlieren set-up. The technique used a single, weak focal-length lens placed in the field of view of the system to provide the calibration information required for the extraction of the quantitative data. In the case of the single-mirror set-up, the calibration image required further post-processing procedures to take into account the double refraction experienced by the light. Density gradients were calculated using Abel transform and compared to validated reference data. Results indicate that the single-mirror set-up is able to improve prediction of the density gradient field as compared to the standard z-type schlieren, due to its inherent property of higher sensitivity. The study has shown that the single-mirror set-up performs on average better than the standard z-type system, yielding an overall averaged error of ± 20%, with localized values as low as ± 5% where the shock cell structure is clearly defined, with respect to the validated reference data. At the same time, both systems perform poorly in regions where the flow structure displays poor image contrast.

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More information

Accepted/In Press date: 24 February 2020
e-pub ahead of print date: 21 March 2020
Published date: 1 June 2020
Additional Information: Copyright © 2020, The Visualization Society of Japan

Identifiers

Local EPrints ID: 469266
URI: http://eprints.soton.ac.uk/id/eprint/469266
ISSN: 1343-8875
PURE UUID: a83d9433-6340-418d-ba7c-26866ebe7bbf
ORCID for Desmond Lim: ORCID iD orcid.org/0000-0001-6191-6803

Catalogue record

Date deposited: 12 Sep 2022 16:37
Last modified: 16 Mar 2024 21:04

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Contributors

Author: R Mariani
Author: Desmond Lim ORCID iD
Author: B. Zang
Author: Vevek U S
Author: T.H. New
Author: Y D Cui

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