Comparison of UV Absorption Measurements with Probe-Sampling Measurements of Nitric Oxide Concentration in a Jet Engine Combustor Exhaust
Abstract
Measurements were made in the exhaust of a T-56 turbine engine combustor of nitric oxide (NO) concentration using an ultraviolet (UV) spectral absorption technique. The measurements were made at two axial locations in the combustor exhaust stream. The NO gamma-band radiation at 2265 A produced in a resonance source was passed through the exhaust stream, and the amount transmitted was recorded. The mathematical model used to determine the NO concentration from the absorption measurements is described. Pressure and temperature broadening effects on the measured absorption are considered in the line-by-line transmission calculation. The line-of-sight absorption measurements through the axisymmetric exhaust stream were converted to local concentration values via an iterative radial inversion computation. These in situ measurements are compared to NO concentration values obtained by conventional probe-sampling techniques using a chemiluminescent analyzer. The in situ measurements of the NO concentration were larger than the probe-sampled measurements by from 50 to 80 percent, depending upon the measurement location in the exhaust stream.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA030005
Entities
People
- H. N. Glassman
- J. D. Few
- W. K. Mcgregor
Organizations
- Arnold Engineering Development Complex