Adaptive Closed-Loop Control on an Atmospheric Gaseous Lean-Premixed Combustor

Active control of pressure oscillations has been successfully applied to a lean premixed prevapourised (LPP) combustion rig operating at atmospheric conditions. The design of the rig is based on the primary stage of the Rolls-Royce RB211-DLE industrial gas turbine. Control was achieved by modulating the fuel flow rate in response to a measured pressure signal. The feedback control is an adaptive, model-based self-tuning regulator (STR), which only requires the total time delay between actuation and response to achieve control. The STR algorithm achieves a reduction of up to 30 dB on the primary instability frequency. This performance was an improvement of 5–15 dB over an empirical control strategy (simple time-delay controller) specifically tuned to the same operating point. Initial robustness studies have shown that the STR retains control for a 20% change in frequency and a 23% change in air mass flow rate.Copyright © 2003 by ASME

[1]  P. Langhorne,et al.  Reheat buzz: an acoustically coupled combustion instability. Part 2. Theory , 1988, Journal of Fluid Mechanics.

[2]  Ann P. Dowling,et al.  Forced Oscillations in Combustors With Spray Atomizers , 2002 .

[3]  L. W.,et al.  The Theory of Sound , 1898, Nature.

[4]  A. Putnam.  Combustion-Driven Oscillations in Industry , 1971 .

[5]  P. Langhorne.  Reheat buzz: an acoustically coupled combustion instability. Part 1. Experiment , 1988, Journal of Fluid Mechanics.

[6]  Yedidia Neumeier,et al.  Experimental demonstration of active control of combustion instabilities using real-time modes observation and secondary fuel injection , 1996 .

[7]  Michael C. Janus,et al.  Characterization of Oscillations During Premix Gas Turbine Combustion , 1997 .

[8]  Joerg R. Seume,et al.  Application of Active Combustion Instability Control to a Heavy Duty Gas Turbine , 1998 .

[9]  Anuradha M. Annaswamy,et al.  Active Control Technology for Enhanced Performance Operational Capabilities of Military Aircraft, Land Vehicles and Sea Vehicles , 2001 .

[10]  G. Billoud,et al.  Adaptive Active Control of Combustion Instabilities , 1992 .

[11]  S. Candel,et al.  A review of active control of combustion instabilities , 1993 .

[12]  Anuradha M. Annaswamy,et al.  Optimal control of a swirl-stabilized spray combustor using system identification approach , 2003 .

[13]  Andrzej Banaszuk,et al.  Adaptive control of combustion instability using extremum-seeking , 2000, Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334).

[14]  O. J. M. Smith,et al.  A controller to overcome dead time , 1959 .

[15]  Lennart Ljung,et al.  System Identification: Theory for the User , 1987 .

[16]  Ann P. Dowling,et al.  PRACTICAL ACTIVE CONTROL-SYSTEM FOR COMBUSTION OSCILLATIONS , 1990 .

[17]  Anuradha M. Annaswamy,et al.  Adaptive Algorithms for Control of Combustion , 2001 .