Accession Number : ADA139475

Title :   The Influence of Mixture Distribution on Emissions from an Aircraft Piston Engine.

Descriptive Note : Final rept. Jun 74-May 78,


Personal Author(s) : Mirsky,W ; Nicholls,J A

PDF Url : ADA139475

Report Date : Oct 1980

Pagination or Media Count : 83

Abstract : Cylinder-to-cylinder mixture ratio distributions were measured for both the injected and carbureted versions of the AVCO-Lycoming 0-320 engine to determine the effects of non-uniform distribution on the exhaust emissions of carbon monoxide, hydrocarbons, and oxides of nitrogen. Data for both normal and lean-out conditions were obtained. An experimental Turbulent Flow Manifold for the carbureted engine was tested as a potential means for improved cylinder-to-cylinder distribution. Results showed improvements for the low power operating modes but deterioration for the high power modes. An analysis based on test results predicts that the EPA emission requirements can be met, for this engine, by improving mixture distribution and leaning both the taxi-out and approach modes. Improvements in fuel economy are also predicted. (Author)

Descriptors :   *Aviation fuels, *Piston engines, *Emission control, *Exhaust gases, Fuel air ratio, Variations, Mixtures, Distribution, Nonuniform, Nitrogen oxides, Turbulent flow, Manifolds(Engines), Hydrocarbons, Carbon monoxide, Aircraft carburetors, Taxiing, Approach, Civil aviation, Data acquisition, Air pollution, Standards

Subject Categories : Commercial and General Aviation
      Reciprocating and Rotating Engines
      Air Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE