Iron Contamination in High-Enthalpy Test Facilities: OH PLIF Imaging Considerations

Sopek, Tamara and Brieschenk, Stefan and Vanyai, Tristan and Morgan, Richard G. and McIntyre, Timothy J. (2020) Iron Contamination in High-Enthalpy Test Facilities: OH PLIF Imaging Considerations. Journal of Propulsion and Power, 36 (1). pp. 129-137. ISSN 0748-4658


Thermometry measurements were performed in a scramjet combustor using thermally-assisted laser-induced fluorescence. Experimental data were obtained through laser-induced fluorescence where a laser beam was focused into the combustor and the OH Q1(8) (υ' = 0 → υ' = 1) transition at 283.55 nm was excited. Measurements in the 360 nm spectral region resulted in detection of a strong fluorescence line. Investigation of this phenomenon led to the conclusion that when the OH Q1 (8) line is chosen for excitation, another line of a different species that lies very close to Q1 (8) is also unintentionally excited. The second species has been identified as iron, Fe I. The assumption is that the erosion of the shock tunnel walls introduced iron in the flow that is excited with the laser when exciting OH. Thus, it is very important to ensure that this is avoided in future. Instead, another OH excitation line should be used for OH excitation line in planar laser-induced fluorescence (PLIF) experiments where iron may potentially also be present in the flow. Alternatively, fluorescence from this iron line can be circumvented by proper filtering of the PLIF. A proposal is made to turn the iron contamination into advantage by using iron present in the non-combusting flow for PLIF.

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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 00:10
Last Modified: 28 Jul 2022 01:07
Uncontrolled Keywords: Excitation lines; Fluorescence lines; High-enthalpy test; Iron contamination; Laser induced fluorescence; Planar laser induced fluorescence; Scramjet combustors; Thermometry measurements
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
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