A Caltech Library Service

NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region

Sharma, M. and Austin, J. M. and Glumac, N. G. and Massa, L. (2010) NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region. AIAA Journal, 48 (7). pp. 1434-1443. ISSN 0001-1452.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


In this paper, spatial temperature profiles are examined in the nonequilibrium relaxation region behind a stationary shock wave in a hypervelocity air Mach 7.42 freestream. The normal shock wave is established through a Mach reflection from an opposing wedge arrangement in an expansion tube facility. Schlieren images confirm that the shock configuration is steady and the location is repeatable. Emission spectroscopy is used to identify dissociated species and to make vibrational temperature measurements using both the nitric oxide and the hydroxyl radical A-X band sequences. Temperature measurements are presented at selected locations behind the normal shock. LIFBASE is used as the simulation spectrum software for OH temperature-fitting; however, the need to access higher vibrational and rotational levels for NO leads to the use of an in-house developed algorithm. For NO, results demonstrate the contribution of higher vibrational and rotational levels to the spectra at the conditions of this study. Very good agreement is achieved between the experimentally measured NO vibrational temperatures and calculations performed using an existing state-resolved, three-dimensional forced-harmonic oscillator thermochemical model. The measured NO vibrational temperatures are significantly higher than the OH temperatures.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Additional Information:© 2010 by University of Illinois. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 6 July 2009; revision received 29 January 2010; accepted for publication 31 January 2010. This research was funded in part through the Air Force Office of Scientific Research/Multi-University Research Initiative Grant FA9550-04-1-0425 with John Schmisseur as Technical Monitor.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI)FA9550-04-1-0425
Issue or Number:7
Record Number:CaltechAUTHORS:20140924-080337207
Persistent URL:
Official Citation:M. Sharma, J. M. Austin, N. G. Glumac, and L. Massa. "NO and OH Spectroscopic Vibrational Temperature Measurements in a Post-Shock Relaxation Region", AIAA Journal, Vol. 48, No. 7 (2010), pp. 1434-1443.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49968
Deposited By: Tony Diaz
Deposited On:29 Sep 2014 23:41
Last Modified:03 Oct 2019 07:18

Repository Staff Only: item control page