Accession Number:

ADA067329

Title:

Optical in Situ Versus Probe Measurements of Nitric Oxide Concentration as a Function of Axial Position in a Combustor Exhaust

Descriptive Note:

Final rept. 21 Jul-27 Aug 1977

Corporate Author:

ARO INC ARNOLD AFS TN

Personal Author(s):

• Few, J. D.
• Bryson, R. J.
• Lowry, III, H. S.

Report Date:

1979-03-01

Pagination or Media Count:

37.0

Abstract:

Nitric oxide N0 concentration was measured at three axial stations 6.5, 12, and 25 nozzle diameters downstream of a combustor nozzle exit in a jet engine combustor exhaust by a gas-sampling probe in conjunction with conventional gas analyzers and an optical resonance absorption technique. The gas analyzer system permitted measurements of NO, NO sub x, CO, CO sub 2, and C sub x, H sub y total hydrocarbons whereas the optical absorption technique permitted measurement of NO only. The combustor was exhausted into a test cell of slightly less than atmospheric pressure and was operated at an inlet air temperature of 589 K, a total pressure of 344.3 kPa, and a fuel-to-air ratio f a of 0.02. A multiprobe rake was used to acquire emissions, total pressure and temperature, and static pressure data at the measurement stations. The measurements of total pressure, total temperature, and measured static pressure were used to determine static temperature and pressure profiles at each measurement station, which are required for determining NO concentration by the optical absorption technique.

Descriptors:

• *COMBUSTORS
• *EXHAUST GASES
• *NITROGEN OXIDES
• ABSORPTION
• AXIAL FLOW
• CONCENTRATION(CHEMISTRY)
• EMISSION SPECTRA
• EXHAUST NOZZLES
• GAS ANALYSIS
• JET ENGINE EXHAUST
• MEASURING INSTRUMENTS
• OPTICAL INSTRUMENTS
• SAMPLERS
• STATIC TESTS

Subject Categories:

• Civil Engineering
• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE