A comprehensive mathematical analysis for evaluating the measured emissions from piston type general aviation aircraft engines is presented and discussed. The analysis is used to calculate the fuel-air ratio, molecular weight of the exhaust products, and water correction factor. Further. a sensitivity analysis is presented which shows the effects of emission measurement errors on calculated fuel-air ratio. The University's test facility is briefly described and the associated emissions instrumentation is discussed in detail. The experimental results obtained in this facility on the AVCO-Lycoming LIO-320 engine are presented. This includes baseline and lean-out emissions data and the influence of sampling probe location in the exhaust pipe. The influence of leaks in the exhaust system or emissions console are investigated and evaluated in terms of the mathematical model. Experimental data obtained from various facilities are compared and evaluated. (Author)

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Aerospace Engineering
    Ann Arbor, MI  United States  48109

    Federal Aviation Administration

    Systems R&D Service, 800 Independence Avenue, SW
    Washington, DC  United States 

    National Aviation Facilities Experimental Center

    Federal Aviation Administration
    Atlantic City, NJ  United States  08405
  • Authors:
    • Mirsky, W
    • Pace, R
    • Ponsonby, R
    • Nicholls, J A
    • Geister, D E
  • Publication Date: 1979-6

Media Info

  • Pagination: 158 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198986
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-RD-78-82 Final Rpt., FAA-NA-78-1
  • Contract Numbers: DOT-FA74NA-1102
  • Files: NTIS, TRIS, USDOT
  • Created Date: Nov 7 1980 12:00AM