- Author
- Campbell, D. H.
- Title
- Computational Study of the Application of Laser-Induced Fluorescence to Number Density Measurements of Hydroxide in High-Pressure Combustion Environments.
- Coporate
- Dayton Univ., OH
- Sponsor
- Air Force Systems Command, Edwards Air Force Base, CA
- Report
- WSS/CI 83-27,
- Contract
- F04611-81-C-0012
- Book or Conf
- Combustion Institute/Western States Section. Spring Meeting, 1983. April 11-12, 1983, Pasadena, CA, 26 p., 1983
- Keywords
- lasers
- Abstract
- A rate equation model, which includes a full set of vibrational and rotational levels, has been used to investigate the applicability of laser-induced fluorescence to number density measurements of OH in combustion environments. The extent of deviation of the populations in the laser-pumped vibrational and rotational levels from the simple two-level steady-state model prediction, due to collisional redistrubiton of the internal energy sttes subsequent to laser excitation, was investigated for a range of pressures, temperatures, and laser powers. For pressures of one atmosphere and below, the saturation laser intensity, sarrow bandwidth technique is shown to yield an OH number density within 10 to 20% of the actual value when the two-level model is used for data reduction, as long as the peak fluorescence intensity is measured. For higher pressures, use of a low laser intensity and wide bandwidth detection is necessary to get accurate number densities.