Evaluation of Probe Sampling Versus Optical in situ Measurements of Nitric Oxide Concentrations in a Jet Engine Combustor Exhaust
Final rept. 2 Jul 1974-16 Feb 1975
ARO INC ARNOLD AFS TN
Pagination or Media Count:
Measurements of nitric oxide NO concentrations were made at the exhaust of a jet engine combustor by conventional gas-sampling probe and chemiluminescent analyzer methods, by optical resonance absorption through absorption cells located within the gas sample transfer line, and by optical resonance absorption directly through the combustor exhaust. The combustor was exhausted to atmospheric pressure and was operated at an inlet temperature near 600F, a total pressure of about 3 to 4 atm, and at fuel-to-air ratios fa from 0.01 to 0.05. A tubular inlet, liquid-cooled, stainless steel sampling probe was inserted into the gas stream at the combustor exit. The optical technique used was the resonance absorption method for the 0,0 gamma-band of NO at wavelengths ranging from 2,200 to 2,270 A. The results showed that within the sampling line both the chemiluminescent gas analyzer and the optical absorption method gave NO concentrations that agreed within about 20 percent.
- Jet and Gas Turbine Engines
- Air Pollution and Control