Accession Number : AD0780958

Title :   Comparison of Exhaust Emissions of a Low-Time JT8D-11 Engine: High-Smoke Versus Low-Smoke Combustion Chamber Configurations.

Descriptive Note : Final rept. Jul 72-Dec 73,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Imbrogno,Stephen L. ; Rust,Thomas , Jr

Report Date : APR 1974

Pagination or Media Count : 30

Abstract : Engine-core exhaust emissions were measured on a low-time JT8D-11 engine in both high-smoke and low-smoke configurations. Changing from the high-smoke to the low-smoke configuration considerably reduced the visible smoke, 55 to 90 percent, as measured using the Society of Automotive Engineers (SAE) smoke number. Carbon monoxide was reduced by up to 40 percent. Total unburned hydrocarbons were reduced by 40 percent at idle power, while the production of oxides of nitrogen was increased by 60 percent at the high power setting. These percentages are absolute with no consideration for time in mode, according to the Environmental Protection Agency (EPA) landing/takeoff cycle. (Author)

Descriptors :   *Smoke, *Combustion chambers, *Turbofan engines, Jet engines, Carbon monoxide, Hydrocarbons, Nitrogen oxides

Subject Categories : Civil Engineering
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE