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Experimental study of combustion in a turbulent free shear layer formed at a rearward facing stepA premixed propane-air flame is stabilized in a turbulent free shear layer formed at a rearward facing step. The mean and rms averages of the turbulent velocity flow field are determined by LDV for both reacting (equivalence ratio 0.57) and nonreacting flows (Reynolds number 15,000-37,000 based on step height). The effect of combustion is to shift the layer toward the recirculation zone and reduce the flame spread. For reacting flow, the growth rate is unchanged except very near the step. The probability density function of the velocity is bimodial near the origin of the reacting layer and single-peaked but often skewed elsewhere. Large-scale structures dominate the reacting shear layer. Measurements of their passing frequency from LDV are consistent with high-speed Schlieren movies of the reacting layer and indicate that the coalescence rate of the eddies in the shear layer is reduced by combustion.
Document ID
19810036203
Document Type
Conference Paper
Authors
Pitz, R. W.
(California Univ. Berkeley, CA, United States)
Daily, J. W.
(California, University Berkeley, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 81-0106
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: St. Louis, MO
Start Date: January 12, 1981
End Date: January 15, 1981
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
81A20607
Funding Number(s)
CONTRACT_GRANT: NSF ENG-77-02019
CONTRACT_GRANT: NSG-3227
Distribution Limits
Public
Copyright
Other

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