185. THE STRUCTURE, EXTINCTION, AND AUTOIGNITION OF NONPREMIXED TOLUENE FLAMES

Department: Mechanical & Aerospace Engineering
Faculty Advisor(s): Forman A. Williams | Kalyanasundaram Seshadri

Primary Student
Name: Vaishali Amin
Email: vaamin@ucsd.edu
Phone: 858-534-6123
Grad Year: 2014

Abstract
Experimental and kineticmodelling studies are performed to elucidate the structure andmechanisms of extinction and autoignition of toluene flames in a counterflow configuration under nonpremixed conditions. Experiments are conducted in a flame stabilized between two opposing streams. The fuel stream is a mixture of vaporized toluene and nitrogen, and the oxidizer stream is a mixture of air and nitrogen. Concentration profiles of stable species are measured by removing samples from the reacting mixing layer using a quartz microprobe. The samples are analyzed using a gas chromatograph. Measured profiles include those of C7H8, O2, N2, CO2, CO, H2O, CO, and CH4. Temperature profiles are measured using a Pt-Pt 10%Rh thermocouple. Critical conditions of extinction are measured. Data giving the fuel mole fraction at extinction as a function of the strain rate are obtained. Computations are performed using detailed chemistry to determine the flame structure and to obtain values for critical conditions of extinction and autoignition. These results are compared with experimental data.

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