THIS note describes an investigation of the nonlinear interactions between natural acoustic
modes and forced oscillations in an unstable combustor. Such instabilities are a serious …

This paper describes an experimental investigation of the response of the flame in a lean,
premixed combustor to imposed acoustic oscillations. It presents further analysis and …

Self-excited oscillations of a confined flame, burning in the wake of a bluff body flame holder,
are considered. These oscillations occur due to interaction between unsteady combustion …

MOST aircraft engines, afterburners, and land-based gas and liquid-fired combustors under
some operating conditions exhibit combustion-induced instability of one form or the other …

The second part of the investigation dealt with control of low frequency symmetric instabili: ty
and high frequency helical instability by secondary fuel injection in a pilot flame.+ dding a …

Publisher Summary This chapter presents general considerations of autonomous
combustion oscillations. There are three general classes of combustion oscillations that may …

This paper describes the application of active, open loop, control in effective damping of
severe (ie, peak to peak pressure amplitudes of up to 35 psi relative to a mean combustor …

Clean combustion, with low levels of pollutants, can be achieved by burning lean and
premixed. Unfortunately, these are just the conditions that cause self-excited oscillations …

A low-frequency combustion instability has been successfully controlled on a laboratory rig
with significant mean flow and about 250 kW of mean heat released. The control was …

WHEN combustion takes place within an acoustic res-onator, the interaction between
acoustic waves and unsteady combustion may lead to oscillations of damaging intensity …