Ionic strontium fluorescence as a method for flow tagging velocimetry

Rubinsztein‐Dunlop, Halina; Littleton, Brad; Barker, P. F.; Ljungberg, Peter; Malmsten, Yvonne

doi:10.1007/s003480000132

Cited by 18 publications

(8 citation statements)

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“…A gas molecule (or atom) is added to the flow and the molecule is tagged with a laser beam (e.g., electronically excited, photodissociated, or vibrationally excited). In gas-seeded methods, the flow is seeded with molecules (or atoms) such as acetone, 14 biacetyl, 15,16 nitric oxide, 11,17 nitrogen dioxide, 18 sodium, 19 strontium 20 or tert-butyl nitrate. 21 For test facility flows, the addition of these atomic or molecular seeds is often undesirable for to a variety of reasons (seed toxicity, expense, etc.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

Pitz¹,

Lahr²,

Douglas³

et al. 2005

Appl. Opt.

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Hydroxyl tagging velocimetry (HTV) measurements of velocity were made in a Mach 2 (M 2) flow with a wall cavity. In the HTV method, ArF excimer laser (193 nm) beams pass through a humid gas and dissociate H2O into H + OH to form a tagging grid of OH molecules. In this study, a 7 x 7 grid of hydroxyl (OH) molecules is tracked by planar laser-induced fluorescence. The grid motion over a fixed time delay yields about 50 velocity vectors of the two-dimensional flow in the plane of the laser sheets. Velocity precision is limited by the error in finding the crossing location of the OH lines written by the excimer tag laser. With a signal-to-noise ratio of about 10 for the OH lines, the determination of the crossing location is expected to be accurate within +/- 0.1 pixels. Velocity precision within the freestream, where the turbulence is low, is consistent with this error. Instantaneous, single-shot measurements of two-dimensional flow patterns were made in the nonreacting M 2 flow with a wall cavity under low- and high-pressure conditions. The single-shot profiles were analyzed to yield mean and rms velocity profiles in the M 2 nonreacting flow.

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Section: Introductionmentioning

confidence: 99%

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

Pitz¹,

Lahr²,

Douglas³

et al. 2005

Appl. Opt.

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“…MTV techniques can be categorized by whether the atomic/molecular tracer is "seeded" or "unseeded". In "seeded" MTV methods, the flow is seeded with molecules (or atoms) such as ketone [119,120], ester [121], nitric oxide [122,123], and metal atoms [124,125]. Different atomic/molecular tracers are seeded in terms of different flow fields.…”

Section: Tagging Velocimetry Based On Femtosecond Laser-induced Emissionmentioning

confidence: 99%

A Review of Femtosecond Laser-Induced Emission Techniques for Combustion and Flow Field Diagnostics

Zhang

Liu

et al. 2019

Applied Sciences

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The applications of femtosecond lasers to the diagnostics of combustion and flow field have recently attracted increasing interest. Many novel spectroscopic methods have been developed in obtaining non-intrusive measurements of temperature, velocity, and species concentrations with unprecedented possibilities. In this paper, several applications of femtosecond-laser-based incoherent techniques in the field of combustion diagnostics were reviewed, including two-photon femtosecond laser-induced fluorescence (fs-TPLIF), femtosecond laser-induced breakdown spectroscopy (fs-LIBS), filament-induced nonlinear spectroscopy (FINS), femtosecond laser-induced plasma spectroscopy (FLIPS), femtosecond laser electronic excitation tagging velocimetry (FLEET), femtosecond laser-induced cyano chemiluminescence (FLICC), and filamentary anemometry using femtosecond laser-extended electric discharge (FALED). Furthermore, prospects of the femtosecond-laser-based combustion diagnostic techniques in the future were analyzed and discussed to provide a reference for the relevant researchers.

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“…MTV can be accomplished by direct seeding of the gas using biacetyl [9], N 2 O [11], NO 2 [12], NO [10,13], tert-butyl nitrate [14], and other molecular seeds [15][16][17]. However, these seeds can be expensive, toxic, damaging to the experimental apparatus, or not viable in reacting flows.…”

Section: Introductionmentioning

confidence: 98%

Vibrationally excited hydroxyl tagging velocimetry

Grady

Pitz

2014

Appl. Opt.

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A new molecular-based velocity method is developed for high-temperature flame gases based on the hydroxyl tagging velocimetry (HTV) technique. In vibrationally excited HTV (VE-HTV), two photons from a KrF laser (248 nm) dissociate H₂O into a tag line of vibrationally excited OH (v=1). The excited state OH tag is selectively detected in a background of naturally occurring ground state OH (v=0). In atmospheric pressure laboratory burners, the OH (v=1) tag persists for 5-10 μs, allowing single-shot velocity measurements along a 2 cm line under lean, stoichiometric, and rich flame conditions with temperatures reaching 2300 K. Mean velocity measurements are demonstrated in a lean (ϕ=0.78) premixed H₂/air turbulent flame (Re=26,550) laboratory flame. The VE-HTV method is best suited to measure high-speed velocities in hot combustion environments in the presence of background OH.

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Ionic strontium fluorescence as a method for flow tagging velocimetry

Cited by 18 publications

References 0 publications

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

A Review of Femtosecond Laser-Induced Emission Techniques for Combustion and Flow Field Diagnostics

Vibrationally excited hydroxyl tagging velocimetry

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