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

Article


Sopek, Tamara, Brieschenk, Stefan, Vanyai, Tristan, Morgan, Richard G. and McIntyre, Timothy J.. 2020. "Iron Contamination in High-Enthalpy Test Facilities: OH PLIF Imaging Considerations." Journal of Propulsion and Power: devoted to aerospace propulsion and power. 36 (1), pp. 129-137. https://doi.org/10.2514/1.B37676
Article Title

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

ERA Journal ID3579
Article CategoryArticle
AuthorsSopek, Tamara (Author), Brieschenk, Stefan (Author), Vanyai, Tristan (Author), Morgan, Richard G. (Author) and McIntyre, Timothy J. (Author)
Journal TitleJournal of Propulsion and Power: devoted to aerospace propulsion and power
Journal Citation36 (1), pp. 129-137
Number of Pages9
Year2020
Place of PublicationUnited States
ISSN0748-4658
1533-3876
Digital Object Identifier (DOI)https://doi.org/10.2514/1.B37676
Web Address (URL)https://arc.aiaa.org/doi/10.2514/1.B37676
Abstract

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.

KeywordsExcitation lines; Fluorescence lines; High-enthalpy test; Iron contamination; Laser induced fluorescence; Planar laser induced fluorescence; Scramjet combustors; Thermometry measurements
ANZSRC Field of Research 2020400106. Hypersonic propulsion and hypersonic aerothermodynamics
510299. Atomic, molecular and optical physics not elsewhere classified
510203. Nonlinear optics and spectroscopy
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Byline AffiliationsUniversity of Queensland
Institution of OriginUniversity of Southern Queensland
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