One impediment to substantially further the reductions in NOx emissions for aviation gas
turbine engines is thermal-acoustic instabilities, also referred to as combustion dynamics …

Combustion dynamics is a prominent problem in the design and operation of low-emission
gas turbine engines. Even modest changes in fuel composition or operating conditions can …

EAN-burning, low emission combustors are being investigated for aircraft gas turbine
engines. Lean combustion is shown to be advantageous for reducing NOx emissions and …

The thermoacoustic response of an industrial-scale gas turbine combustor to fuel flow
perturbations is examined. Experimental measurements in a laboratory combustor along …

A number of recent articles have demonstrated the use of active control to mitigate the
effects of combustion instability in afterburner and dump combustor applications. In these …

Controlling combustion instabilities by means of open-loop forcing at non-resonant
frequencies is attractive because neither a dynamic sensor signal nor a signal processor is …

Combustion instabilities can lead to increased development time and cost for aeroengine
gas turbines. This problem has been evident in the development of very-low emissions …

THIS paper describes an investigation of background noise ef-fects upon combustion
instabilities. Specifically, it addresses the effects of noise upon the operating conditions …

The present paper describes an active control system consisting of a fast-acting actuator
valve, coupled with a control algorithm capable of adaptive phase and amplitude control for …

Lean combustion concepts for aircraft engine combustors are prone to combustion
instabilities. Mitigation of instabilities is an enabling technology for these low-emissions …