Turbulent Mixing and Combustion for High-Speed Air-Breathing Propulsion Application
Abstract
Work was completed on mixing, chemical-reaction, and combustion processes in turbulent, subsonic, and supersonic flows. Research included high-speed internal flows of interest to scramjet mixing and combustion, aimed at flow-control and flame holding issues. The control authority and mixing in subsonic and transonic flows affected by mass injection and heat release was quantified. In parallel, Large Eddy Simulation (LES) with Sub-Grid Scale (SGS) modeling of these flows was conducted with codes verified against predictions of Linear Stability Analysis (LSA) theory. Research on hydrocarbon combustion was conducted on premixed methane-air, ethane-air, and (diluted) ethylene-air flames. Detailed measurements of flame extinction strain-rate and flame speed were obtained at different compositions at atmospheric pressure. Direct Numerical Simulations (DNS) of axisymmetric unsteady flows in both cold and chemically reacting impinging jets with full chemistry were also performed. Experimental investigations of the three-dimensional full-field structure of scalar dispersion fields in grid turbulence were initiated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 12, 2007
- Accession Number
- ADA470739
Entities
People
- Paul E. Dimotakis
Organizations
- California Institute of Technology