Trace Radical Species Detection in a Turbulent Chemical Kinetic Flow Reactor Using a 180 Degree Laser - Fluorescence Probe.

Details Trace Radical Species Detection in a Turbulent Chemical Kinetic Flow Reactor Using a 180 Degree Laser - Fluorescence Probe. Trace Radical Species Detection in a Turbulent Chemical Kinetic Flow Reactor Using a 180 Degree Laser - Fluorescence Probe.

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........51l&link_type=abstract

Thesis (PH.D.)--PRINCETON UNIVERSITY, 1990.Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1892.

Physics

Scientific paper

This thesis reports the development of a unique optical probe for spacially precise measurements of trace radical species concentrations in a high temperature, hostile, chemically reacting environment, and reports the results of spectroscopic measurements of the hydroxyl radical concentration in a turbulent chemical kinetic flow reactor. The flow reactor at Princeton provides detailed intermediate and product stable species data useful for understanding the high temperature reaction mechanisms of fuels. Radical species concentrations are desired; however, their detection in the flow reactor is difficult relative to their measurement in flames. The dilute operation of the flow reactor and its lower temperature lead, for example, to peak hydroxyl radical concentrations estimated to be much lower than in ordinary flames. In addition, the flow reactor has severely limited optical access. To overcome these constraints and measure radical species concentrations along the longitudinal axis of the reactor, a unique 180^circ laser induced fluorescence probe has been developed and calibrated with line-of-sight laser absorption measurements. Hydroxyl radical concentrations measurements in moist carbon monoxide oxidation in the flow reactor have been made at initial temperatures of 989, 1053 and 1115 K and the laser induced fluorescence probe and absorption measurements indicate peak OH concentrations of 10, 25, and 51 ppm. The detection limit of the current system is 1 ppm with a resolution of +/-2 ppm; anticipated improvements should reduce these by an order of magnitude.

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