Development of Combustion Diagnostics and Applications to Turbulent Combustion.
Abstract
Measurements with a tunable diode laser absorption system have been conducted in steady, fluctuating and sooting atmospheric-pressure flames produced in either a flat flame or a slot burner. Parameters measured include temperature, CO species concentration and CO spectroscopic parameters (line strengths and collision half widths). The measurements involve rapidly scanning the narrow-linewidth diode laser across individual vibration-rotation lines in the fundamental band of CO at 4.6 microns to record fully-resolved absorption line profiles in times as short as 100 microseconds. A conventional microprobe sampling system has been used to monitor CO and CO2 concentrations to enable comparisons between laser-based and conventional probe-based measurements; thermocouples have been used to allow comparisons with laser-based temperature measurements. Results in fuel-rich flames show good agreement between the laser-based and probe-based measurements. Work is in progress to extend the measurements to fuel lean stoichiometries. Work has progressed on assembly and checkout of a new facility for studies of the dynamics of fluctuating or turbulent combustion flows. The facility generates a two-dimensional shear flow which will be used to study the coupling between fluid dynamic and chemical processes in a turbulent mixing layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1979
- Accession Number
- ADA079523
Entities
People
- C. T. Bowman
- Ronald Kenneth Hanson
Organizations
- Stanford University