Accession Number : ADA192955

Title :   Premixed Turbulent Flame Propagation.

Descriptive Note : Annual rept. 1 Nov 86-31 Oct 87,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Santavicca, D A

PDF Url : ADA192955

Report Date : 08 Jan 1988

Pagination or Media Count : 15

Abstract : Results are presented from an experimental study of premixed turbulent flame propagation under atmospheric pressure, unconfined conditions. Stoichiometric propane air frames at two turbulence conditions were studied. LDV was used to obtain ensemble averaged measurements of velocity, turbulence intensity and integral time scale through the propagating flame. The integral length scale ahead of the flame was obtained both directly from a two-point spatial correlation measurement and indirectly using Taylor's hypothesis. In addition, laser planar imaging was used to obtain two-dimensional flame structure measurements which were processed with a fractal analysis. Both the mean velocity and the turbulence were observed to change immediately ahead of the propagating flame. The mean velocity was found to decrease due to the unconfined nature of the flame and the turbulence intensity was found to increase due to the turbulence-flame interactions. Sudden increases in both the mean velocity and the turbulence intensity across the flame were observed, where the absolute increase in turbulence conditions. Similar results have been reported by other researchers. The integral time scale was observed to decrease ahead of the propagating flame but the changes behind the flame were inconsistent. Keywords: Premixed turbulent combustion, Turbulent flame propagation.

Descriptors :   *FLAME PROPAGATION, *TURBULENCE, BAROMETRIC PRESSURE, COMBUSTION, CORRELATION, FLAMES, INTENSITY, LASERS, LENGTH, MEAN, MEASUREMENT, MIXING, OPTICAL IMAGES, PROPANE, SCALE, SPATIAL DISTRIBUTION, STOICHIOMETRY, TIME, TWO DIMENSIONAL, VELOCITY, FUEL AIR RATIO, TURBULENT FLOW, FLOW FIELDS

Subject Categories : Combustion and Ignition
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE