Two-Point Scalar Time-Series Measurements in Turbulent Partially Premixed Flames
Abstract
The technique of Picosecond Time-Resolved Laser-Induced Fluorescence (PITL1F) was expanded to enable two-point hydroxyl (OH) series concentration time series measurements of turbulent jet flames. Measurements were obtained with two-point separation along the radial direction of the jet (delta r), i.e., the propagation direction of the horizontal laser beam, as well as axial two-point separations, i.e. along the axis of the jet, i.e., the z-direction. As the jet configuration is statistically axisymmetric, so that statistical analyses along the azimuthal direction can be considered insignificant, this allows complete coverage of the jet flame. Investigation of axial two-point statistics requires a different laser configuration than that of the previous radial two-point system: either a single vertical laser beam or two horizontal beams with adjustable vertical separation. The combustor used in this study has a closed base which does not permit vertical alignment of a laser; hence, the two-beam configuration was adopted. With the installation of our new diode-pumped laser system, which generates nearly ten times more UV power than before, the laser can now be split into two beams while still providing a sufficient signal level at each probe volume. This paper describes experimental details for this new approach and its demonstration within a well-studied turbulent hydrogen-nitrogen nonpremixed flame, the H3 flame (H2/N2 = 50:50, Re = 10,000).
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2009
- Accession Number
- ADA498254
Entities
People
- Galen B. King
- Michael W. Renfro
- Normand M. Laurendeau
Organizations
- Purdue University