An acoustically consistent, linear modal analysis-based analytical method is presented to predict the longitudinal and transverse combustion instabilities in a two-dimensional Cartesian dump combustor. At first, rigorous acoustical analysis (without combustion) is performed of two duct configurations with one and two discontinuities in the cross-sectional area. Novel, acoustically consistent jump or matching conditions are developed and applied at the duct cross-sectional interface(s), with distinct forms for the purely axial and nonaxial modes. The effects of uniform and nonuniform mean flows, cross-sectional area ratio, as well as of different types of boundary conditions on the duct acoustic modes are investigated. Acoustic modal frequency predictions are in excellent agreement with the analytical and numerical results of Meissner (“Effect of Cross-Sectional Area Discontinuities in Closed Hard-Walled Ducts on Frequency of Longitudinal Modes,”
Acoustically Consistent Investigation of Combustion Instabilities in a Dump Combustor
Journal of Propulsion and Power ; 31 , 1 ; 294-308
2014-10-20
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Acoustically Consistent Investigation of Combustion Instabilities in a Dump Combustor
Online Contents | 2015
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