Flow tagging velocimetry for low and high temperature flowfields

Wehrmeyer, Joseph A.; Ribarov, Lubomir A.; Oguss, Douglas A; Batliwala, Farrokh; Pitz, Robert W.; DeBarber, Peter A.

doi:10.2514/6.1999-646

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…water and nitric oxide) are present are needed. To predict the concentration of O 3 as a function of temperature, pressure and time, the CHEMKIN II thermodynamic database and the SENKIN chemical kinetics solver [24] are used with a set of 119 reversible reactions, including reactions involving nitrogen oxides [17].…”

Section: The Chemistry Of Generation and Destruction Of Ozone Tag Linesmentioning

confidence: 99%

“…The contour plot of figure 12 serves as a guide for laser tuning as a function of path length to the probe volume. The centre of the P(15) line is shown at 0 cm −1 and the R (17) line is at about 6 cm −1 . Our analysis indicates that, at large propagation distances ( 170 cm or greater), tuning the laser off the peak absorption at the line centres of P (15) and R (17) has a beneficial effect.…”

Section: Test Facility Issues Of Otvmentioning

confidence: 99%

“…After a time delay, a second laser pulse reveals the displaced O 3 tag line position by causing photodissociation of O 3 and subsequent fluorescence of the vibrationally excited O 2 photoproduct. Use of the OTV technique in low-temperature air flows, writing as many as six intersecting lines of 20-40 mm length, has been described and demonstrated [14][15][16][17]. The OTV method is well suited for low-temperature flows; however, at high temperatures, both the tag line lifetime and the peak concentration of O 3 are reduced [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry

Pitz

Wehrmeyer

Ribarov

et al. 2000

Meas. Sci. Technol.

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Two complementary unseeded molecular flow tagging techniques for gas-flow velocity field measurement at low and high temperature are demonstrated. Ozone tagging velocimetry (OTV) is applicable to low-temperature air flows whereas hydroxyl tagging velocimetry (HTV) is amenable to use in high-temperature reacting flows containing water vapour. In OTV, a grid of ozone lines is created by photodissociation of O 2 by a narrowband 193 nm ArF excimer laser. After a fixed time delay, the ozone grid is imaged with a narrowband KrF laser sheet that photodissociates the ozone and produces vibrationally excited O 2 that is subsequently made to fluoresce by the same KrF laser light sheet via the O 2 transition B 3 − u (v = 0, 2) ← X 3 − g (v = 6, 7). In HTV, a molecular grid of hydroxyl (OH) radicals is written into a flame by single-photon photodissociation of vibrationally excited H 2 O by a 193 nm ArF excimer laser. After displacement, the OH tag line position is revealed through fluorescence caused by OH A 2 +-X 2 (3 ← 0) excitation using a 248 nm tunable KrF excimer laser. OTV and HTV use the same lasers and can simultaneously measure velocities in low and high temperature regions. Instantaneous flow-tagging grids are measured in air flows and a flame. The velocity field is extracted from OTV images in an air jet using the image correlation velocimetry (ICV) method.

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Section: The Chemistry Of Generation and Destruction Of Ozone Tag Linesmentioning

confidence: 99%

Section: Test Facility Issues Of Otvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry

Pitz

Wehrmeyer

Ribarov

et al. 2000

Meas. Sci. Technol.

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“…The original development of this tagging approach 32,33 utilized two-photon photodissociation of water vapor using a 248 nm excimer laser and the resulting OH was interrogated by its fluorescence excited at 308 nm. Advances in this approach have recently been reported under the acronym HTV (Hydroxyl Tagging 34,35 Velocimetry). In these developments, single-photon dissociation of vibrationally-excited water vapor by an ArF excimer laser ( = 193 nm) generates OH photoproducts at a concentration higher than the ambient.…”

Section: Gas-phase Applicationsmentioning

confidence: 99%

Molecular Tagging Velocimetry (MTV) - Progress and applications

Koochesfahani

1999

30th Fluid Dynamics Conference

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This paper describes some of the recent progress in Molecular Tagging Velocimetry and its applications. A brief overview of the different molecular tagging methods mostly in use today is given. Improvements in tagging, detection, and processing schemes, allow whole-field measurements of two components of the velocity vector simultaneously at more than 600 points over a plane with sufficient accuracy to make this technique a viable tool for fluid flow studies. Application of MTV to several flow fields are described to highlight some of the capabilities of this technique. The examples include boundary-layer resolved measurements of unsteady boundary layer separation, slow convective flow in directional solidification, intake flow into a model IC engine, and the hot flow in late compression of a motored IC engine. Finally, examples are given to illustrate the potential for simultaneous flow visualization/passive scalar and velocity measurements, as well as threecomponent velocimetry using stereo imaging.

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“…In a collaborative effort with R. Pitz (Vanderbilt), it was applied to Lagrangian flow-tagging techniques (Ozone-tagging Velocimetry (OTV), or hydroxyl-tagging velocimetry (HTV)) for low-and high-temperature gas-phase flows , Wehrmeyer et al 1999.…”

Section: Advances In Image Correlation Velocimetrymentioning

confidence: 99%

Mixing, Chemical Reactions, and Combustion in Subsonic and Supersonic Turbulent Flows

Dimotakis¹,

Leonard²

1998

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Flow tagging velocimetry for low and high temperature flowfields

Cited by 10 publications

References 11 publications

Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry

Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry

Molecular Tagging Velocimetry (MTV) - Progress and applications

Mixing, Chemical Reactions, and Combustion in Subsonic and Supersonic Turbulent Flows

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