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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Domenico, Francesca De Shah, Priyav Benjamin, A. O. Williams Ewart, Paul Steven, M. Lowe Fan, Luming Hochgreb, Simone |
| Copyright Year | 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. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791851050 |
| DOI | 10.1115/GT2018-75804 |
| Volume Number | Volume 4A: Combustion, Fuels, and Emissions |
| Conference Proceedings | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition |
| Language | English |
| Publisher Date | 2018-06-11 |
| Publisher Place | Oslo, Norway |
| Access Restriction | Subscribed |
| Subject Keyword | Spectroscopy Temperature Turbulence Diffraction gratings Entropy Calibration Quartz Density Flow (dynamics) Wavelength Temperature measurement Lasers Fluctuations (physics) Jets Combustion chambers |
| Content Type | Text |
| Resource Type | Article |
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