Spatially and Temporally Resolved Temperature and Species Concentration Measurements in High-Pressure Combustors using fs-CARS

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-08-M-2837
Agency Tracking Number: F073-059-1004
Amount: $99,994.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2007
Solicitation Topic Code: AF073-059
Solicitation Number: 2007.3
Small Business Information
SPECTRAL ENERGIES, LLC
2513 Pierce Ave., Ames, IA, 50010
DUNS: 782766831
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Sivaram Gogineni
 Project Manager
 (937) 266-9570
 spgogineni@gmail.com
Business Contact
 Terrence Meyer
Title: Technical Director
Phone: (937) 286-5711
Email: contact@spectralenergies.com
Research Institution
N/A
Abstract
The objective of the proposed Phase-I research effort is to develop femtosecond (fs) laser-based coherent anti-Stokes Raman scattering (CARS) spectroscopy for providing quantitative high-speed (1-10 kHz) temperature and species concentration measurements in unsteady reacting flows. The initial frequency-spread dephasing rate of the Raman coherence induced by the ultrafast (~85 fs) Stokes and pump beams will be used to measure gas-phase temperature for high-pressure combustion. This initial frequency-spread dephasing rate of the Raman coherence is completely independent of local molecular collisions and depends only on the frequency spread of the Raman transitions at different temperatures. Single-shot CARS thermometry will be performed by obtaining time-resolved CARS spectra from chirped probe pulse. A simple theoretical model based on the assumption of impulsive excitation of Raman coherence will be developed to interpret and extract high-speed, single-shot temperature from the interaction of a chirped probe-pulse with the Raman coherence. During the Phase-I research effort measurements will be performed in laboratory flames. Successful implementation of the proposed technique will pave the way for the application of fs-CARS for high-speed temperature and species concentration measurements in high-pressure gas-turbine test rig and augmentor at Wright-Patterson Air Force Base (WPAFB) during the Phase-II research effort.

* information listed above is at the time of submission.

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