Forced Nonlinear Acoustic Damping in a Rijke Tube and its Application to Combustion Instability Control

2014 ◽  
Author(s):  
Eric J. Jacob
Keyword(s):  
Combustion Instability ◽  
Rijke Tube ◽  
Acoustic Damping ◽  
Instability Control ◽  
Nonlinear Acoustic

Combustion Instability Control Through Acoustic Modulation at the Inlet Boundary: Experiments

2015 ◽  
Vol 31 (6) ◽  
pp. 1672-1688 ◽  
Author(s):  
John W. Bennewitz ◽  
Robert A. Frederick ◽  
Jacob T. Cranford ◽  
David M. Lineberry
Keyword(s):  
Combustion Instability ◽  
Instability Control ◽  
Acoustic Modulation

Application of Active Combustion Instability Control to a Heavy Duty Gas Turbine

1998 ◽  
Vol 120 (4) ◽  
pp. 721-726 ◽  
Author(s):  
J. R. Seume ◽  
N. Vortmeyer ◽  
W. Krause ◽  
J. Hermann ◽  
C.-C. Hantschk ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Combustion Instability ◽  
Pressure Fluctuations ◽  
Preventive Measure ◽  
Feedback System ◽  
Operating Conditions ◽  
Combustion Instabilities ◽  
Instability Control ◽  
Heavy Duty Gas Turbine

During the prototype shop tests, the Model V84.3A ring combustor gas turbine unexpectedly exhibited a noticeable “humming” caused by self-excited flame vibrations in the combustion chamber for certain operating conditions. The amplitudes of the pressure fluctuations in the combustor were unusually high when compared to the previous experience with silo combustor machines. As part of the optimization program, the humming was investigated and analyzed. To date, combustion instabilities in real, complex combustors cannot be predicted analytically during the design phase. Therefore, and as a preventive measure against future surprises by “humming,” a feedback system was developed which counteracts combustion instabilities by modulation of the fuel flow rate with rapid valves (active instability control, AIC). The AIC achieved a reduction of combustion-induced pressure amplitudes by 86 percent. The Combustion instability in the Model V84.3A gas turbine was eliminated by changes of the combustor design. Therefore, the AIC is not required for the operation of customer gas turbines.

Combustion Instability Control Through Acoustic Modulation at the Inlet Boundary: Analysis

2015 ◽  
Vol 31 (6) ◽  
pp. 1689-1695
Author(s):  
John W. Bennewitz ◽  
Sarma L. Rani ◽  
Jacob T. Cranford ◽  
Robert A. Frederick
Keyword(s):  
Combustion Instability ◽  
Boundary Analysis ◽  
Instability Control ◽  
Acoustic Modulation
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