Single-Shot Temperature Measurements in a Scramjet Combustor Using Thermally Assisted Laser-Induced Fluorescence

Sopek, Tamara and Brieschenk, Stefan and Vanyai, Tristan and Morgan, Richard G. and McIntyre, Timothy J. (2020) Single-Shot Temperature Measurements in a Scramjet Combustor Using Thermally Assisted Laser-Induced Fluorescence. AIAA Journal, 58 (8). pp. 3486-3498.


Abstract

The knowledge of the temperature in the flowfield of the scramjet is critical to the understanding of its performance. This study represents the application of an optical diagnostic technique, thermally assisted laser-induced fluorescence, to the temperature measurements in the combustor of a supersonic combustion engine. The experiments were conducted in the T4 shock tunnel using a scramjet model. Experimental data were obtained by focusing a laser beam into the combustor and exciting the OH radical. A detailed numerical model that simulates all radiative and collisional processes of relevance with the appropriate system of differential equations was developed for the analysis of the influence of energy transfer processes on the fluorescence signal. The population distributions achieved with numerical modeling of the LIF process validated the approach proposed to deduce temperatures. By evaluating the scramjet LIF spectra with a full spectral fit, a temperature distribution across the combustor width was obtained. The experimental results were compared with the computational fluid dynamics simulations of the combustion process.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 28 Jul 2022 01:19
Last Modified: 28 Jul 2022 03:32
Uncontrolled Keywords: Collisional process; Computational fluid dynamics simulations; Energy transfer process; Fluorescence signals; Laser induced fluorescence; Optical diagnostic techniques; Supersonic combustion; System of differential equations
Fields of Research (2020): 40 ENGINEERING > 4001 Aerospace engineering > 400106 Hypersonic propulsion and hypersonic aerothermodynamics
51 PHYSICAL SCIENCES > 5102 Atomic, molecular and optical physics > 510299 Atomic, molecular and optical physics not elsewhere classified
51 PHYSICAL SCIENCES > 5102 Atomic, molecular and optical physics > 510203 Nonlinear optics and spectroscopy
Identification Number or DOI: https://doi.org/10.2514/1.J058985
URI: http://eprints.usq.edu.au/id/eprint/50492

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