- Author
-
Puri, R.
|
Moser, M.
|
Santoro, R. J.
|
Smyth, K. C.
- Title
- Laser-Induced Fluorescence Measurements of OH in Laminar Diffusion Flames in the Presence of Soot Particles.
- Coporate
- Pennsylvania State Univ., University Park
National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Contract
- NIST-GRANT-60NANB01035
- Book or Conf
- Combustion Institute/Eastern States Section. Chemical and Physical Processes in Combustion. Proceedings. Fall Technical Meeting, 1991. October 14-16, 1991,
Ithaca, NY,
34/1-4 p.,
1991
- Keywords
-
combustion
|
soot
|
lasers
|
fluorescence
|
hydroxyl radicals
|
laminar flames
|
diffusion flames
- Identifiers
- laser induced fluorescence (LIF)
- Abstract
- Combustion in a simple view is the process of oxidation to form stable products, usually CO₂ and H₂O, accompanied by the release of energy. Although we often view this as a simple case of oxygen reacting with a fuel to exothermically form product species, it is well known that radicals such as OH, H and O have a significant fole in the reaction chemistry. It is the specifics of these reactions which determine the rates at which they proceed and the routes by which minor products such as No, soot and CO result. The radical species participate in numerous reactions, and there exists a competition among several chemical steps for each reactive species. Important to determining the dominant set of reactions are the local conditions involving temperature, pressure and species concentrations. As these conditions vary, the dominant reactive pathways will also change. It is this dynamic situation which challenges researchers as they attempt to understand the variety of processes which characterize combustion. In the present study, measurements of hydroxyl radicals obtained in laminar diffusion flames containing soot particles are described. Previous work has shown that the emission of CO from diffusion flames is closely related to the observed soot concentrations. The ultimate objective of the current study is to provide an understanding of the competition for OH between CO and soot, since OH is a key oxidizer for each. There are no measurements of OH in sooty regions of flames, and predicting the OH cocentrations is difficult. Thus, the present work is intended to specifically establish the OH concentration variations as the soot concentration is changed.