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Mixing and chemical reaction in an idealized swirl chamber [electronic resource].

Published
Washington, D.C. : United States. Dept. of Defense, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
20 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Defense, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A vorticity-based, low-Mach-number model for simulating combustion in closed chambers is constructed. Numerical scheme is based on a mixed finite-difference pseudo-spectral discretization of the governing equations. Discrete evolution equations are integrated in time using a predictor-corrector scheme, while discrete elliptic systems are inverted with the help of fast-Poisson solver. Scheme is applied to analyze mixing and combustion in an idealized swirl cavity, which consists of the annular space between a spinning inner cylinder and a stationary reaction. To this end, we assume that the oxidizer and fuel are initially separated by a thin mixed region, and carefully control mixing levels by varying the duration of the swirl-driven mixing period. The mixture is then ignited along the boundary of the inner cylinder. When pre-mixing is complete, an axisymmetric flame front is established, and the reactants are consumed as the front propagates radially outwards. When the charge is partially mixed, combustion in the early stages predominantly occurs within a non-uniform premixed front. As this non-uniform front approaches the outer cylinder, a transition to a distributed combustion regime occurs. Following the transition, the remaining fuel burns at a slow rate within non-premixed flames which wrap around the inner cylinder. Results show that the mixing time has substantial effects on the pressure rise within the cavity and on the evolution of the burnt fraction, and that these effects become more pronounced as the Damkoehler number increases.
Report Numbers
E 1.99:sand--96-8529c
E 1.99: conf-960772--1
conf-960772--1
sand--96-8529c
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Note
Published through SciTech Connect.
01/01/1996.
"sand--96-8529c"
" conf-960772--1"
"DE96006765"
26. international symposium on combustion, Naples (Italy), 28 Jul - 2 Aug 1996.
Najm, H.N.; Knio, O.M.; Worlikar, A.S.
Funding Information
AC04-94AL85000
View MARC record | catkey: 14108232