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research-article

HIGH FREQUENCY MEASUREMENT OF TEMPERATURE AND COMPOSITION SPOTS WITH LITGS

[+] Author and Article Information
Francesca De Domenico

Department of Engineering, University of Cambridge, UK
fd314@cam.ac.uk

Steven M. Lowe

Department of Engineering, University of Cambridge, UK
sml58@cam.ac.uk

Luming Fan

Department of Engineering, University of Cambridge, UK
lf368@cam.ac.uk

Simone Hochgreb

Department of Engineering, University of Cambridge, UK
sh372@cam.ac.uk

Priyav Shah

Department of Engineering, University of Oxford, UK
priyav.shah@eng.ox.ac.uk

Benjamin A.O. Williams

Department of Engineering, University of Oxford, UK
ben.williams@eng.ox.ac.uk

Paul Ewart

Department of Physics, University of Oxford, UK
paul.ewart@physics.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041275 History: Received June 26, 2018; Revised August 07, 2018

Abstract

Temperature and composition spots in a turbulent flow are detected and time-resolved using Laser Induced Thermal Grating Spectroscopy (LITGS). A 355 nm wavelength PIV laser is operated at 0.5 -1 kHz to generate the thermal grating using biacetyl as an absorber in trace amounts. In a open laminar jet, a feasibility study shows that small (~ 3%) fluctuations in the mean flow properties are well captured with LITGS. However, corrections of the mean flow properties by the presence of the trace biacetyl are necessary to properly capture the fluctuations. The actual density and temperature variation in the flow are determined using a calibration procedure validated using a laminar jet flow. Finally, travelling entropy and composition spots are directly measured at different locations along a quartz tube, obtaining good agreement with expected values. This study demonstrates that LITGS can be used as a technique to obtain instantaneous, unsteady temperature and density variations in a combustion chamber, requiring only limited optical access.

Copyright (c) 2018 by ASME
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