Measurements of gas temperatures at 100 kHz within the annulus of a rotating detonation engine

Cycle-resolved measurements of H 2 O temperatures and number densities taken within the detonation channel of a hydrogen—air rotating detonation engine (RDE) at a 100 kHz repetition rate using laser absorption spectroscopy are presented. The laser source used is an MEMS-tunable Vertical-Cavity Surfa...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2017-03, Vol.123 (3), p.1-9, Article 88
Main Authors: Rein, Keith D., Roy, Sukesh, Sanders, Scott T., Caswell, Andrew W., Schauer, Frederick R., Gord, James R.
Format: Article
Language:English
Subjects:
Absorption spectra
Absorption spectroscopy
Applied physics
Detonation
Engineering
Fiber optics
Lasers
Optical Devices
Optical fibers
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Sapphire
Spectrum analysis
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Summary:Cycle-resolved measurements of H 2 O temperatures and number densities taken within the detonation channel of a hydrogen—air rotating detonation engine (RDE) at a 100 kHz repetition rate using laser absorption spectroscopy are presented. The laser source used is an MEMS-tunable Vertical-Cavity Surface Emitting laser which scans from 1330 to 1360 nm. Optical access into and out of the RDE is achieved using a dual-core fiber optic. Light is pitched into the RDE through a sapphire window via a single-mode core, retroreflected off the mirror-polished inner radius of the RDE annulus, and collected with the multi-mode fiber core. The resulting absorption spectra are used to determine gas temperatures as a function of time. These measurements allow characterization of the transient-temperature response of the RDE.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-017-6647-5