CARS DIAGNOSTICS FOR HIGH-PRESSURE COMBUSTION
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Date
1980
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Publisher
Ohio State University
Abstract
Theoretical and experimental investigations of the feasibility of using CARS for high pressure combustion diagnostics will be described. An expression has been derived for the third-order, nonlinear electric susceptibility governing vibrational Q-branch CARS generation that is valid for overlapping spectral lines. Experimentally, the CARS spectrum of $N_{2}$ has been investigated as function of pressure in the range one to 95 atmospheres in a high pressure vessel. The experimental signatures show evidence of significant pressure-induced, or collisional narrowing. Theoretical calculations based on the generalized, third-order susceptibility expression are in good agreement with these results, which show that CARS has considerable promise for high pressure combustion diagnosis. Recent demonstrations of CARS thermometry in a sooting flame and a liquid-fuelled combustor will also be reviewed. Theoretical calculations of Q-branch homogeneous linewidths needed for high accuracy in $N_{2}$ CARS diagnostics will also be described.
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