Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Hydroxyl tagging velocimetry in a supersonic flow over a cavity

Not Accessible

Your library or personal account may give you access

Abstract

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 × 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.

© 2005 Optical Society of America

Full Article  |  PDF Article
More Like This
Hydroxyl tagging velocimetry method optimization: signal intensity and spectroscopy

Lubomir A. Ribarov, Shengteng Hu, Joseph A. Wehrmeyer, and Robert W. Pitz
Appl. Opt. 44(31) 6616-6626 (2005)

Vibrationally excited hydroxyl tagging velocimetry

Nathan Grady and Robert W. Pitz
Appl. Opt. 53(31) 7182-7188 (2014)

Flame flow tagging velocimetry with 193-nm H2O photodissociation

Joseph A. Wehrmeyer, Lubomir A. Ribarov, Douglas A. Oguss, and Robert W. Pitz
Appl. Opt. 38(33) 6912-6917 (1999)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (16)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved