Fundamental Studies on Spray Combustion and Turbulent Combustion
Abstract
Four major tasks are described: An atomization experiment, an atomization analysis, a turbulent reactive flow analysis, and a vaporizing droplet analysis. The atomization theoretical and experimental studies consider the nonlinear distortion of a planar liquid fuel stream. Various modes of surface instabilities are identified and analyzed in detail. Critical values of parameters related to surface tension, stream velocities, disturbance wavelength, stream densities, and liquid stream thickness are identified as the separation between stable and unstable interfaces. Measurements of the resulting spray characteristics are also presented. The analysis for turbulent reactive flows emphasizes molecular mixing and chemical reaction within a vortical structure. Isolated vortices are examined. The vortices are at the interface between two flows of different composition. Probability density functions (pdf) and concentration and velocity profiles are determined and compared to existing experimental data. Temporally-developing and spatially-developing mixing layers are simulated. Merging and pairing of vortices is shown to be the major entrainment mechanism. The larger values of the pdf on the high-speed-stream side of the simulated mixing layer agree with experiment but are shown to be caused by a velocity bias rather than by larger mixing rates. The study of vaporizing droplets involves Navier-Stokes solution for the axisymmetric flow around and within fuel droplets.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA219840
Entities
People
- B. E. Stapper
- C.- H. Chiang
- G. S. Samuelsen
- R. H. Rangel
- William A. Sirignano
Organizations
- University of California, Irvine