| A New Paradigm in Modeling and Simulations of Complex Oxidation Chemistry Using a Statistical Approach |
31-Mar-2009 |
66 pages |
| Authors:
Josette Bellan; CALIFORNIA INST OF TECH PASADENA
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 | This report describes a study performed under ARO sponsorship, addressing the investigation of a novel way to reduce complex and extensive oxidation reaction mechanisms containing hundreds of species to a much smaller number of progress variables, typically by a factor of ten. Because the results have been documented in several manuscripts, this final report is in the form of an Executive Summary succinctly describing the results and putting them in ... |
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| Supercritical and Transcritical Shear Flows in Microgravity: Experiments and Direct Numerical Simulations |
AUG 2006 |
314 pages |
| Authors:
Dustin W. Davis; Bruce Chehroudi; Douglas G. Talley; Josette Bellan; Nora Okong'o; ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA
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| Experiments and direct numerical simulations (DNS) were conducted on shear layers at subcritical to supercritical pressures. The experiments were performed on single-component coaxial jets, where the slower inner flow was liquid nitrogen, the faster outer flow was cold gaseous nitrogen, and the environment was room temperature gaseous nitrogen. The experiments were performed with and without the effects of transverse acoustic waves. Careful attention was given to measuring all the initial ... |
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| Large Eddy Simulations of Supercritical Multicomponent Mixing Layers |
19 JUN 2001 |
4 pages |
| Authors:
Josette Bellan; JET PROPULSION LAB PASADENA CA
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| The objective of this study is the fundamental understanding of fuel disintegration and mixing in a supercritical environment (relative to the fuel) in order to determine parameter regimes advantageous to mixing. The approach is based on developing a model of a supercritical, turbulent jet mixing with surrounding fluid. The method is one that combines the modeling of supercritical fluids with a systematic development based on the Large Eddy Simulation (LES) ... |
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| Direct Numerical Simulations of LOX/H2 Temporal Mixing Layers Under Supercritical Conditions |
MAR 2001 |
44 pages |
| Authors:
Nora Okong'o; Kenneth Harstad; Josette Bellan; JET PROPULSION LAB PASADENA CA
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| Direct Numerical Simulations (DNS) of a supercritical LOX/H2 temporal three-dimensional mixing layer are conducted for the purpose of exploring the features of high pressure mixing behavior. The conservation equations are formulated according to fluctuation-dissipation (FD) theory which is not only totally consistent with non-equilibrium thermodynamics, but also relates fluxes and forces from first principles. According to FD theory, complementing the low-pressure typical transport properties (viscosity, diffusivity and thermal conductivity), the ... |
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