Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera

Medhi, Biswajit and Hegde, Gopalkrishna M and Reddy, Kalidevapura Jagannatha (2019) Time-resolved quantitative visualization of complex flow field emitted from an open ended shock tube using a wavefront measuring camera. In: OPTICS AND LASERS IN ENGINEERING, 122 . pp. 354-360.

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Abstract

Quantitative visualization of shock-induced complex flow field emanating from the open end of a miniaturized hand-driven shock tube (Reddy tube) is presented. During operation, the planar shock wave of Mach number M-i=1.33 (+/- 0.6%) is discharged through the low-pressure driven-section, kept open to ambient room condition. From the moment of shock discharge, its after effects of evolving flow field are recorded for 300 mu s near the exit of the tube by using a high resolution (16 MP) wavefront measuring camera (WC) setup. The ability of the camera to identify the amplitude and phase of the incident light wave is utilized to measure the flow induced change in phase of the interrogating light beam quantitatively. Information about the evolving flow field with a spatial resolution of 40 mu m/pixel (for a field of view (FOV) 120 mm x 120 mm) and time resolution of 50 mu s is recorded in repeated runs. The measured phase information is used in the iterative refraction tomographic scheme to recover the three-dimensional (3D) density distribution of the flow field quantitatively, which reveals the internal features of the domain. Computational fluid dynamic (CFD) simulation is carried out for the same experimental conditions and it is found that recovered experimental density distribution shows good agreement with the results obtained through CFD simulation.

Item Type:	Journal Article
Publication:	OPTICS AND LASERS IN ENGINEERING
Publisher:	ELSEVIER SCI LTD
Additional Information:	copyright for this article belongs to ELSEVIER SCI LTD
Keywords:	Wavefront sensing; Wavefront camera; Phase imaging; Flow visualization; Tomography; Shock wave; Shock tube
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) Autonomous Societies / Centres > Society for Innovation and Development
Date Deposited:	01 Jan 2020 06:24
Last Modified:	01 Jan 2020 06:24
URI:	http://eprints.iisc.ac.in/id/eprint/64213

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