Turbulent Mixing and Combustion for High-Speed Air-Breathing Propulsion Application
Final rept. 1 Jan 2004-31 Dec 2006
CALIFORNIA INST OF TECH PASADENA DEPT OF AERONAUTICS
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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.
- Fluid Mechanics
- Combustion and Ignition
- Jet and Gas Turbine Engines