OPTICAL IN SITU VERSUS PROBE MEASUREMENTS OF NITRIC OXIDE CONCENTRATION AS A FUNCTION OF AXIAL POSITION IN A COMBUSTOR EXHAUST

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.

  • Supplemental Notes:
    • Prepared in cooperation with ARO, Inc., Tullahoma, TN.
  • Corporate Authors:

    Arnold Air Force Engineering Development Center

    Arnold Air Force Station
    Tullahoma, TN  USA  37389
  • Authors:
    • Few, J D
    • Bryson, R J
    • Lowry III, H S
  • Publication Date: 1979-3

Media Info

  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198347
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AEDC-TR-78032 Final Rpt.
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM