NTRS - NASA Technical Reports Server

Back to Results
Coherent Anti-Stokes Raman Spectroscopy (CARS) Measurements in Supersonic Combustors at NASA Langley Research CenterThis paper describes the recent use of coherent anti-Stokes Raman spectroscopy (CARS) to study supersonic combustion at NASA Langley Research Center. CARS is a nonlinear optical measurement technique used to measure temperature and species mole fractions remotely in harsh environments. A CARS system has been applied to two different combustor geometries at NASA Langley. Both experiments used the same vitiated wind-tunnel facility to create an air flow that simulates flight at Mach numbers of 6 and 7 for the combustor inlet and both experiments used hydrogen fuel. In the first experiment, the hydrogen was injected supersonically at a 30-degree angle with respect to the incoming flow. In the second experiment, the hydrogen was injected sonically at normal incidence. While these injection schemes produced significantly different flow features, the CARS method provided mean temperature, N2, O2 and H2 maps at multiple downstream locations for both. The primary aim of these measurements was to provide detailed flowfield information for computational fluid dynamics (CFD) code validation.
Document ID
Document Type
Preprint (Draft being sent to journal)
Danehy, Paul M.
(NASA Langley Research Center Hampton, VA, United States)
OByrne, Sean B.
(NASA Langley Research Center Hampton, VA, United States)
Tedder, Sarah A.
(NASA Langley Research Center Hampton, VA, United States)
Cutler, Andrew D.
(George Washington Univ. Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Research And Support Facilities (Air)
Meeting Information
JANNAF 40th Combustion/28th Airbreathing Propulsion/22nd Propulsion Systems Hazards/4th Modeling and Simulation Joint Subcommittee Meeting(Charleston, SC)
Funding Number(s)
OTHER: 794-40-93-49-01
Distribution Limits
Work of the US Gov. Public Use Permitted.
No Preview Available