Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 18, 1984
- Accession Number
- ADA148408
Entities
People
- T. Y. Toong
Organizations
- Massachusetts Institute of Technology