Basic Instability Mechanisms in Chemically Reacting Subsonic and Supersonic Flows.
Abstract
The nature of turbulence-combustion interactions was examined by the use of simultaneous dual-thermocouple velocity and LDV-thermocouple measurements, which showed that the presence of the high-frequency velocity (in a direction normal to the flame brush) and temperature fluctuations within slowly drifting turbulent premixed V-flames was associated with changes in the flame shapes, thicknesses, and propagation speeds. Unlike the RMS normal-velocity fluctuations which assumed maximum values within the reaction zone, the RMS tangential-velocity fluctuations remained almost constant, implying that the flame-generated turbulence was in the normal direction. Furthermore, cross-correlation coefficients of simultaneous velocity and temperature fluctuations remained positive within the flame, with values involving normal velocities higher than those involving tangential components. Keywords: Turbulence, Combustion interactions, Instability mechanisms, Dist turbulent flames.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 23, 1987
- Accession Number
- ADA190101
Entities
People
- Tau-yi Toong
Organizations
- Massachusetts Institute of Technology