Accession Number:

ADA148408

Title:

Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows.

Descriptive Note:

Annual technical rept. 30 Sep 83-29 Sep 84,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1984-10-18

Pagination or Media Count:

21.0

Abstract:

Temporal development of spectral changes in the thermal structure of premixed, rod-stabilized, lean methane-air V-flames was examined as a quasi-laminar flame in the absence of grid-generated turbulence propagated into the wake region of a neighboring cylindrical rod of different diameters. Significant changes in the spectral structure were observed. In the presence of turbulence-generating grids or disturbance wakes, there was an increase in the intensities of the smaller eddies within the flame brush, thus resulting in higher apparent turbulent-flame-propagation speeds due to rate-augmentation. Examination of the effects of the equivalence ratio and the turbulence scale and intensity showed the possible role of the coupling between chemical kinetics and turbulence in augmenting the high-frequency fluctuations. A one-component Laser-Doppler-Velocimetry system was purchased and a traversing mechanism was being constructed. Author

Subject Categories:

  • Physical Chemistry
  • Fluid Mechanics
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE