Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method
Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method
In this study, pressure distributions were reconstructed from phase-locked surface deformation measurements on a thin plate. Slope changes on the plate surface were induced by an external flow interacting with the specimen and measured with a highly sensitive deflectometry setup. The Virtual Fields Method (VFM) was used to obtain pressure reconstructions from the processed surface slopes and the plate material constitutive mechanical parameters. The applicability of the approach in combination with phase-locked measurements is demonstrated using a synthetic jet setup generating a periodic flow in air. Phase-averaging slope data allows mitigating random noise effects and resolving low-range differential pressure amplitudes despite the turbulent flow. The size of the spatial structures of the investigated low amplitude flow events identified in full-field with the present method are O(1) mm, which is beyond the capabilities of other available surface pressure measurement techniques. Challenges and limitations in achieving the metrological performance for resolving the observed surface slopes of O(0.1) mm km−1 are described and improvements for future applications are discussed.
Deflectometry, Dynamic pressure, Full-field measurement, Surface pressure, Virtual Fields Method
379-392
Kaufmann, R.
a0e0bbcd-2cf6-47b9-97fd-c17dd3b8f658
Ganapathisubramani, B.
0097a836-da70-4a2e-a9d7-f60ca01b6089
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
1 March 2020
Kaufmann, R.
a0e0bbcd-2cf6-47b9-97fd-c17dd3b8f658
Ganapathisubramani, B.
0097a836-da70-4a2e-a9d7-f60ca01b6089
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Kaufmann, R., Ganapathisubramani, B. and Pierron, F.
(2020)
Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method.
Experimental Mechanics, 60 (3), .
(doi:10.1007/s11340-019-00564-6).
Abstract
In this study, pressure distributions were reconstructed from phase-locked surface deformation measurements on a thin plate. Slope changes on the plate surface were induced by an external flow interacting with the specimen and measured with a highly sensitive deflectometry setup. The Virtual Fields Method (VFM) was used to obtain pressure reconstructions from the processed surface slopes and the plate material constitutive mechanical parameters. The applicability of the approach in combination with phase-locked measurements is demonstrated using a synthetic jet setup generating a periodic flow in air. Phase-averaging slope data allows mitigating random noise effects and resolving low-range differential pressure amplitudes despite the turbulent flow. The size of the spatial structures of the investigated low amplitude flow events identified in full-field with the present method are O(1) mm, which is beyond the capabilities of other available surface pressure measurement techniques. Challenges and limitations in achieving the metrological performance for resolving the observed surface slopes of O(0.1) mm km−1 are described and improvements for future applications are discussed.
Text
paper_03
- Accepted Manuscript
More information
Accepted/In Press date: 18 November 2019
e-pub ahead of print date: 18 December 2019
Published date: 1 March 2020
Additional Information:
Funding Information:
This work was funded by the Engineering and Physical Sciences Research Council (EPSRC). Girish Jankee has supported this work by providing hot wire data for the nozzle exit velocities.
Publisher Copyright:
© 2019, The Author(s).
Keywords:
Deflectometry, Dynamic pressure, Full-field measurement, Surface pressure, Virtual Fields Method
Identifiers
Local EPrints ID: 441458
URI: http://eprints.soton.ac.uk/id/eprint/441458
ISSN: 1741-2765
PURE UUID: d204e63a-b2b5-482c-9816-9d5ddbf22791
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Date deposited: 12 Jun 2020 16:40
Last modified: 17 Mar 2024 05:38
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Author:
R. Kaufmann
Author:
B. Ganapathisubramani
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