Accession Number : ADA189980

Title :   An Investigation of Flow Structure, Mixing and Chemical Reaction in Combusting Turbulent Flows.

Descriptive Note : Annual technical rept. 1 Sep 86-31 Aug 87,

Corporate Author : STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Bowman, Craig T ; Cantwell, Brian J

PDF Url : ADA189980

Report Date : 31 Aug 1987

Pagination or Media Count : 7

Abstract : An experimental investigation of the relationship between flow structure and chemical reaction in turbulent reacting flows is in progress. The principal objective of the research is to examine the spatial structure of the unsteady reaction process as it relates to the unsteady velocity field. The configuration chosen for study is a co-flowing, non-premixed jet flame. A small perturbation in the fuel jet velocity, produced acoustically, is used to create a very periodic and controllable flame, suitable for conditional sampling. Initial measurements of the unsteady velocity field in the flame have been obtained using laser anemometry. In addition, flow visualization experiments have been conducted using direct and schlieren photography and Mie scattering from the seed particles introduced into the flow. Planar laser-induced fluorescence images of the OH radical, which provide spatially and temporally resolved information on the instantaneous location of the reaction zone, have been obtained. A particle tracking technique to facilitate acquisition of velocity field data has been developed, and is being used to provide velocity field data to be overlaid on the reaction field data to reveal the flame-flow interaction. Keywords: Combustion, Diagnostics, Turbulent flow.

Descriptors :   *COMBUSTION, *TURBULENT FLOW, *JET FLAMES, ACQUISITION, CHEMICAL REACTIONS, FLAMES, FLOW, FLOW VISUALIZATION, IMAGES, LASER ANEMOMETERS, LASER INDUCED FLUORESCENCE, MIE SCATTERING, PARTICLES, PERTURBATIONS, SAMPLING, SCHLIEREN PHOTOGRAPHY, SPATIAL DISTRIBUTION, TEST METHODS, TRACKING, FLAME PROPAGATION, JET FLOW, HYDROXYL RADICALS, HELIUM, FLOW FIELDS, VELOCITY

Subject Categories : Combustion and Ignition
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE