Advanced Laser Diagnostics for Quantitative Species Measurements in Turbulent Combustion

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$740,871.00
Award Year:
1996
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
28246
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Southwest Sciences, Inc.
1570 Pacheco St Suite E-11, Santa Fe, NM, 87505
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Daniel J. Kane
(505) 984-1322
Business Contact:
() -
Research Institution:
n/a
Abstract
Jet engines and other turbine combustors operate at high pressures, with turbulence length and time scales on the order of 100 um and 100 us. Accurate experimental characterization of turbulent reacting flows is critical for validating computational fluid dynamics and chemistry codes used in the design of advanced turbine combustors. Laser-based diagnostics are typically used to characterize velocity, temperature, and concentrations of key chemical species in flames. However, most diagnostics in current use are not capable of resolving all of the time and length scales of interest. We propose to develop new diagnostic tools and techniques that take advantage of the characteristics of high-power, ultrashort pulse, mode-locked Ti:sapphire lasers. Phase I emphasis will be placed on the development of a spatially resolved pump-probe absorption technique to determine absolute number densities of the free radical CH, a key trace species in flames. Further Phase I work will study the use of picosecond degenerate-four-wave-mixing (DFWM) for CH number density measurements. This background-free technique promises to have greater sensitivity than absorption based techniques. Measurement of OH and NO using these techniques will require the third harmonic of Ti:sapphire. Determining the design for laser systems to measure these trace species will lay the foundation for the Phase II effort.

* information listed above is at the time of submission.

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