Abstract
A theoretical analysis of nonlinear, large-amplitude, acoustic power dissipation by screens and porous liners with and without superimposed uniform flow is presented. Screen and liner acoustic energy dissipation is described in terms of various steady flow drag coefficients which are appropriate at the large amplitudes and low frequencies characteristic of combustion instabilities in ram burners. The limiting assumption is that particle displacement is large relative to typical screen dimensions. A parallel analysis of acoustic power dissipated through a choked system exit also is derived. This analysis was utilized to estimate acoustic power production attending a large amplitude, 45-50 Hz longitudinal instability in a simulated ramjet combustor. A porous liner which incremented system dissipation by less than 5% was subsequently installed and found to be totally effective in extinguishing the observed instability.
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