Velocity is a very important parameter in the characterization of aerodynamic flowfields. There are two approaches used to measure velocity: probe-based (intrusive) and laser-based (nonintrusive) techniques. Two widely used nonintrusive techniques relevant to this study are particle image velocimetry and molecular tagging velocimetry (MTV). The authors report a laser diagnostic technique which relies on planar laser-induced fluorescence of vibrationally excited nitric oxide (NO(ny=1) molecules produced from the 355 nm photodissociation of seeded NO2 for molecular tagging velocimetry applications. The technique was applied toward an axisymmetric highly underexpanded jet flowfield to yield single-component (streamwise) velocity maps. Detection of the photodissociated NO(ny=1) molecules would be valuable in flow environments where molecular tagging velocimetry would be highly desirable, but where there are also significant background concentrations of NO. The technique would also be valuable in high-quenching and/or low-velocity flow conditions due to the long-lived nature of the photodissociated NO molecules. Single-shot streamwise velocity uncertainties were about 5% and could be lowered by increasing signal to noise. In addition, the vibrational relaxation of NO was explored in support of a U.S. Air Force Office of Scientific Research Multidisciplinary University Research Initiative project and it was found that the vibrational decay of NO was heavily dependent on collisional vibrational relaxation with oxygen atom formed through NO2 photodissociation.


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    Titel :

    Molecular tagging using vibrationally excited nitric oxide in an underexpanded jet flowfield


    Weitere Titelangaben:

    Molekulare Geschwindigkeitsmesung mit Hilfe schwingungsangeregter Stickoxide in einem unterexpandierten Jet-Strömungsfeld


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 47 , 11 ; 2597-2604


    Erscheinungsdatum :

    2009


    Format / Umfang :

    8 Seiten, 10 Bilder, 1 Tabelle, 41 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch