Grantee Research Project Results
Study of the Structure and Emissions of Partially Premixed CH4 FlamesEPA Grant Number: U914938
Title: Study of the Structure and Emissions of Partially Premixed CH4 Flames
Investigators: Osborne, Robin J.
Institution: Vanderbilt University
EPA Project Officer: Packard, Benjamin H
Project Period: January 1, 1996 through July 15, 1999
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1996) RFA Text | Recipients Lists
Research Category: Fellowship - Mechanical Engineering , Academic Fellowships , Safer Chemicals
The objective of this research project is to facilitate the construction of accurate models of the finite-rate chemistry that occurs during combustion. Based on these models, combustion processes can be optimized several different ways, such as altering fuel compositions, air/fuel ratios, or temperatures.
I plan to make simultaneous multiple-point measurements of major species (CH4, CO2, H2, O2, N2, and H2O), OH, and temperature in laminar, partially premixed methane flames using a KrF excimer laser and a new UV Raman/laser-induced predissociative fluorescence (LIPF) spectrometer system that I have already designed and built. NO and CO concentrations also will be measured using laser-induced fluorescence, while temperature measurements will be taken by measuring the Rayleigh signal. Both cylindrical and coflow geometries will be studied, and the effect of aerodynamic stretch and curvature will be examined. Results from these experiments will be compared to a flamelet library based on existing models. These experiments on partially premixed methane flames will focus on understanding the effect of aerodynamics and flame curvature on pollutant formation in basic flame geometries typically found in residential and commercial appliances. In addition, this research project will provide an experimental basis for detailed pollutant chemistry models, leading the way to better designs of appliances to improve our environment.