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Constant-volume Flame Propagation: Finite-sound-speed Theory.
NTIS: PB 261 335 :26 pages
In a Bureau of Mines study, unsteady, spherically symmetric, one- dimensional, compressible-flow (finite sound speed) equations were solved numerically for a spherical deflagration propagating concentrically in a spherical vessel with mach numbers ranging from 0.2 to 0.7; Trajectory histories agree with the infinite-sound-speed theory developed by perlee, fuller, and saul (pfs). A preliminary result of this study shows that flames propagating with speeds greater than 20 pct the speed of sound in the unburned gas mixture generate a complex history of aerodynamic waves distributed throughout the spherical vessel. Although the average pressure and flame radius agree with those predicted by the pfs models, the aerodynamic waves have a pronounced effect on the flame velocity, differing appreciably from that predicted by the pfs model.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 261 335
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division