Dynamics and stability of lean-premixed swirl-stabilized combustion

Experimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations

Diagnostic techniques for the monitoring and control of practical flames

A review of active control approaches in stabilizing combustion systems in aerospace industry

Investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations

Due to its good performance in terms of low pollutant emissions, the lean premixed, prevaporized combustor design has received a special interest in the field of gas turbines. This article reports an experimental study of a laboratory-scale, premixed, prevaporized, swirl-stabilized combustor operated with preheated air and fed with liquid heptane as fuel. Under certain operating conditions, it exhibits well-established combustion oscillations at frequencies near 400 Hz. To understand and control these instabilities, it is useful to determine the burner response to external modulations. A novel actuator relying on secondary air modulation was designed and integrated in the injector to allow measurements of the combined transfer function of the burner and actuation system. Two different techniques were used for this determination: direct measurement between command and pressure on photo-multiplier signals based on spectral and cross-spectral densities, or identification through a finite impulse response num...

Nicolas Robart

Papers

Transfer function measurements in a model combustor: Application to adaptive instability control