High Frequency Measurement of Temperature and Composition Spots with LITGS
Publication Date
2019-03-01Journal Title
Journal of Engineering for Gas Turbines and Power
ISSN
0742-4795
Publisher
ASME
Volume
141
Issue
3
Type
Article
Metadata
Show full item recordCitation
Domenico, F., Shah, P., Lowe, S., Fan, L., Ewart, P., Williams, B., & Hochgreb, S. (2019). High Frequency Measurement of Temperature and Composition Spots with LITGS. Journal of Engineering for Gas Turbines and Power, 141 (3)https://doi.org/10.1115/1.4041275
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.
Sponsorship
EPSRC, Qualcomm
Funder references
EPSRC (EP/K02924X/1)
EPSRC (1720999)
Identifiers
External DOI: https://doi.org/10.1115/1.4041275
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286325
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