Accession Number : ADA112473

Title :   In-Cylinder Sampling of Hydrocarbons in a Texaco L-141 TCP Engine.

Descriptive Note : Final rept. 1978-1981,


Personal Author(s) : Ingham,Michael C ; Myers,P S ; Uyehara,O A

PDF Url : ADA112473

Report Date : 20 Feb 1982

Pagination or Media Count : 8

Abstract : A TECHNIQUE WAS DEVELOPED TO OBTAIN TIME- AND SPATIALLY-RESOLVED GAS SAMPLES FROM THE DEVELOPMENT VOLUME OF A RECIPROCATING ENGINE. The technique was used to investgate the distribution of fuel and products of combustion, with emphasis on the sources and formation mechanisms of gaseous hydrocarbons, in a single cylinder -141 TCP engine. A mathematical model predicted the actual sample gas origin, relative to the instantaneous sampling orifice position, as a function of the local gas motion and properties. Samples were taken at times ranging from 30 deg CA BTDC to 60 deg CA ATDC. Gas chromatography gave the sample composition, including the concentration versus carbon number distribution of the hydrocarbons. Local stoichiometry, local reactant hydrogen/carbon ratio and apparent local particulate concentration were also calculated. Significant vertical stratification persists in the L-141 TCP combustion chamber as late as 60 deg CA ATDC, indicating that mixing in the vertical direction in the central part of the chamber is inhibited by solid body rotation of the gases. Exhaust hydrocarbons consisted primarily of heptane, probably originating from the bowl surface, and species having two carbon atoms. Total hydrocarbons and the relative proportion of heptane to C2 species decreased with increasing load, because of the higher gas temperatures. (Author)

Descriptors :   *Engine cylinders, *Gas analysis, *Sampling, Fuels, Combustion products, Emission, Axial flow, Stratification, Hydrocarbons, Mathematical models

Subject Categories : Test Facilities, Equipment and Methods
      Combustion and Ignition
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE