- Author
-
Puri, R.
|
Moser, M.
|
Santoro, R. J.
|
Smyth, K. C.
- Title
- Laser-Induced Fluorescence Measurements of OH Concentrations in the Oxidation Region of Laminar, Hydrocarbon Diffusion Flames.
- Coporate
- Pennsylvania State Univ., University Park
National Institute of Standards and Technology, Gaithersburg, MD
- Contract
- NIST-GRANT-60NANB0D1035
- Book or Conf
- Combustion Institute, Symposium (International) on Combustion, 24th. July 5-10, 1992,
Combustion Institute, Pittsburgh, PA,
Sydney, Australia,
1015-1022 p.,
1992
- Keywords
-
combustion
|
laminar flames
|
diffusion flames
|
lasers
|
oxidation
- Identifiers
- laser-induced fluorescence (LIF)
- Abstract
- Quantitative OH concentrations have been measured in four coannular diffusion flames, burning methane at a single fuel flow rate and ethene at fuel flow rates which produce non-smoking, incipient smoking, and smoking conditions. Laser-induced fluorescence has been used to make point profile, line image, and two-dimensional image measurements. These data have been placed on an absolute basis by reference to earlier absorption results. Particular emphasis has been placed on the investigation of the soot oxidation region in these laminar flames, since current soot models must utilize either assumed or estimated OH concentrations. As the soot concentration increases, both the OH concentration and the flame temperature are found to decrease. Estimates of the superequilibrium levels of OH increase as the measured concentrations decrease, which makes accurate a priori prediction of OH concentrations problematic in diffusion flames containing significant soot concentrations.