- Author
- Richards, C. D. | Pitts, W. M.
- Title
- Experimental Study of the Stabilization Region of Lifted Turbulent-Jet Diffusion Flames.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Combustion Institute/Eastern States Section. Fall Technical Meeting, 24th. October 14-16, 1991, Ithaca, New York, 1-4 p., 1991
- Keywords
- diffusion flames | turbulent jet flames | flame liftoff | rayleigh light scattering
- Identifiers
- video images; concentration profiles; isothermal fuel jets
- Abstract
- The stabilization mechanism of a lifted turbulent-jet diffusion flame remains an active area of research despite numerous studies. The early work of Vanquickenbourne and Van Tiggelen and Kalghati provided experimental documentation of life-off heights for a variety of fuels. Based on visual and photographic observation of flames in conjunction with extractive probe sampling in isothermal fuel jets it was postulated in that lifted flames are anchored at the radial location where a stoichiometric mixture exits, and furthermore, that the height attained corresponds to the position where the flow and turbulent flame speeds are matched. Although this time-averaged view provides a means of predicting life-off height, more physical insight is required to develop a model of stabilization which includes current knowledge on the structure of turbulent jets and mixing. The present study is in many ways an update of the Vanquickenbourne and Van Tiggelen experiments. The anchoring position of a lifted flame is obtained through image analysis of video images and concentration profiles are independently acquired in the corresponding isothermal fuel jets with Rayleigh light scattering (RLS). These diagnostics provide both temporal and spatial resolution.