Investigation of Damping Methods for Augmentor Combustion Instability
Final technical rept. 1 Mar 1971-31 Oct 1972
PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FL FLORIDA RESEARCH AND DEVELOPMENT CENTER
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Absorbing liners or screech liners are commonly used in the augmentors currently being proposed and developed can experience low frequency instabilities for which liners of conventional design are an impractical solution because of the unacceptably large volumes required for the linear resonator cavity. The objective of this program was to develop practical augmentor acoustic devices for controlling low frequency combustion instabilities. Analysis, supported by cold flow impedance experiments, indicated that dimpled array liners, i.e., liners with punched and therefore lengthened apertures, complex-porous liners having facings of two different porous materials in series, and acoustic energy absorbing flameholders could provide sufficient absorption.
- Combustion and Ignition
- Jet and Gas Turbine Engines