Break Up of Vortex Rings in Impinging Turbulent Jet Flames.
Abstract
The objective of this experimental investigation is to examine the structure of turbulent flow in jet flames inpinging on flat walls with particular emphasis on the formation and break up of vortex ring-like eddies. Experiments include the study of heat transfer to the wall, and the influence of eddies on the mechanism of heat transfer, with variation in flow geometry and burner initial conditions. During the first year of research a new flame-impingement rig has been commissioned, preliminary flow visualizations have been made showing flame structure over a wide range of conditions. Considerable data have been obtained in non-impinging flames, which will later be compared with impinging flame data. As a result of this preliminary work it is found that ring vortex eddies are identified in impinging flames for a wide range of flow geometries, equivalence ratios and types of gaseous fuel. These eddies break up into 'flamelets' which remain coherent for long distances. These coherent structures require further investigation because they must strongly influence heat transfer to the wall and fluctuations in gas temperature near the wall. Similar structures have been identified and measured in non-impinging flames. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1980
- Accession Number
- ADA092619
Entities
People
- A. J. Yule
- N. A. Chigier
Organizations
- University of Sheffield