Abstract
Abstract An analysis of the effects of entropy or material waves on high frequency pressure oscillations in a liquid rocket combustor is presented. The combustor is assumed to have a concentrated combustion zone and a zero length nozzle. The nonlinear perturbation analysis employs the techniques or multiple scales in order to reduce the governing partial differential equations to an ordinary differential equation describing the pressure oscillation limit cycles. Linear stability limits are also determined. The maximum destabilizing effect of entropy waves on these limits is of the order of 15%. Under certain conditions it is found that the entropy waves can effectively cancel the damping effect of the short nozzle.
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