Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows.
Annual technical rept. 30 Sep 83-29 Sep 84,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
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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
- Physical Chemistry
- Fluid Mechanics
- Combustion and Ignition