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

Pitz, Robert W. and Wehrmeyer, Joseph A. and Rlbarov, Lubomir A. and Oguss, Douglas A. and Batliwala, Farrokn and DeBarber, Peter A. and Deusch, Stefan and Dimotakis, Paul E. (2000) Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry. Measurement Science and Technology, 11 (9). pp. 1259-1271. ISSN 0957-0233. doi:10.1088/0957-0233/11/9/303.

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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^3Σ_u^-(v'=0,2) ← X^3Σ_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_2O by a 193 nm ArF excimer laser. After displacement, the OH tag line position is revealed through fluorescence caused by OH A^2Σ^+_-X^2Π (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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Additional Information:© 2000 Institute of Physics. Received 13 January 2000, in final form and accepted for publication 4 May 2000. The Vanderbilt University authors gratefully acknowledge the support of NASA-Glenn (grant NAG3-1984, with Dr Richard G Seasholtz as the technical monitor) and BMDOARO (DURIP award DAAG55-98-1-0197 with Dr David M Mann as the technical monitor). The Vanderbilt University and MetroLaser authors wish to acknowledge the support of the Arnold Engineering Development Center (DoD SBIR Phase II grant F40600-96-C-0002, with Dr Ronald H Kohl and Dr H Thomas Bentley as technical monitors). We thank Dr Richard Yetter of Princeton University for providing us with his O3 chemistry reaction mechanism and thank S Nandula for technical assistance. The Cal Tech authors gratefully acknowledge the support of AFOSR (grant F49620-98-1-0052 with Dr Julian Tishkoff as the technical monitor).
Funding AgencyGrant Number
Department of Energy (DOE) SBIR Phase II grantF40600-96-C-0002
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0052
Subject Keywords:laser diagnostics, molecular flow tagging, fluid flow velocity, excimer lasers, combustion diagnostics, image correlation velocimetry
Issue or Number:9
Classification Code:PACS: 47.80.-v; 06.30.Gv; 42.55.Ks; 42.55.Lt; 42.62.Eh; 42.60.By
Record Number:CaltechAUTHORS:20111209-083545829
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Official Citation: Unseeded molecular flow tagging in cold and hot flows using ozone and hydroxyl tagging velocimetry Robert W Pitz et al 2000 Meas. Sci. Technol. 11 1259
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28382
Deposited By: Ruth Sustaita
Deposited On:09 Dec 2011 17:04
Last Modified:12 Jul 2022 19:52

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