Velocity Profile Measurements in Hypersonic Flows Using Sequentially Imaged Fluorescence-Based Molecular Tagging

Bathel, Brett F.; Danehy, Paul M.; Inman, Jennifer A.; Jones, Stephen B.; Ivey, Christopher B.; Goyne, Christopher P.

doi:10.2514/1.j050722

Cited by 66 publications

(39 citation statements)

References 40 publications

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“…Therefore, if strong pressure gradients exist between the left and right edges of a measurement line, significant errors could result. 6 The two places in underexpanded jet flows where this is likely to occur are near the nozzle exit (that is, along the first measurement line within the jet) and across normal shock waves. Other competing effects, like the increase in density across a shock, may lead to almost constant signal intensity across the shock, reducing the effect of this error.…”

Section: Discussion Of Fluorescence-based Velocimetry Techniquesmentioning

confidence: 99%

Review of Fluorescence-Based Velocimetry Techniques to Study High-Speed Compressible Flows

Bathel

Johansen

Inman

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This paper reviews five laser-induced fluorescence-based velocimetry techniques that have been used to study high-speed compressible flows at NASA Langley Research Center. The techniques discussed in this paper include nitric oxide (NO) molecular tagging velocimetry (MTV), nitrogen dioxide photodissociation (NO 2 -to-NO) MTV, and NO and atomic oxygen (O-atom) Doppler-shift-based velocimetry. Measurements of both singlecomponent and two-component velocity have been performed using these techniques. This paper details the specific application and experiment for which each technique has been used, the facility in which the experiment was performed, the experimental setup, sample results, and a discussion of the lessons learned from each experiment. Nomenclature

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Section: Discussion Of Fluorescence-based Velocimetry Techniquesmentioning

confidence: 99%

Review of Fluorescence-Based Velocimetry Techniques to Study High-Speed Compressible Flows

Bathel

Johansen

Inman

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

View full text Add to dashboard Cite

show abstract

“…Additionally, since the duration of the extent of the 1 st exposure beyond the end of the laser pulse was comparable to the duration of the pulse itself, use of the simple approximation for the temporal delay between the 1 st and 2 nd used in Ref. 22 may result in a small error. Although the magnitude of this error is expected to be negligible for the results presented in this study, future work aimed at quantifying the error is warranted.…”

Section: Future Workmentioning

confidence: 99%

“…The methodology for calculating uncertainty levels associated with this technique is outlined in the literature. 21,22 Small uncertainties were measured within the jet core near (z = 0 mm) since high signal-to-noise was observed in these areas. Since the fluorescence signal is proportional to the local concentration of NO, the signal-to-noise levels decreased at z locations away from the jet core.…”

Section: Molecular Tagging Velocimetrymentioning

confidence: 99%

“…Details of how this separation time is calculated can be found in the literature. 21,22 A systematic comparison of the frame pairs was used to determine the displacement of each tagged line. The timing sequence used for the velocity measurement was similar to that used in Ref.…”

Section: B Velocity Measurementmentioning

confidence: 99%

“…NO PLIF molecular tagging velocimetry 21,22 was used to characterize the wake flow with the B2 RCS jet pair activated. NO was seeded both into the B2 RCS jets and from the junction between the model and sting.…”

Section: Molecular Tagging Velocimetrymentioning

confidence: 99%

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