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Keywords: oscillations
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Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2012, 134(3): 031502.
Published Online: December 29, 2011
...Lipika Kabiraj; R. I. Sujith; Pankaj Wahi Bifurcation analysis is performed on experimental data obtained from a simple setup comprising ducted laminar premixed conical flames in order to investigate the features of nonlinear thermoacoustic oscillations. It is observed that as the bifurcation...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2011, 133(5): 052911.
Published Online: December 16, 2010
... influence on the surface behavior of the Li flow in the downstream region. Experiments were carried out with a focus on surface oscillations of the Li flow using the lithium circulation loop at Osaka University. These oscillations are measured using an electro-contact probe apparatus, which can detect...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. April 2011, 133(4): 041501.
Published Online: November 23, 2010
.... As in annular combustors, the particularly critical eigenmodes with low frequencies are predominantly of circumferential nature; the stability of annular combustors is often governed by the onset of circumferential acoustic oscillations. To determine the influence of these circumferential acoustic modes...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2007, 129(1): 38–48.
Published Online: March 16, 2006
... acoustics and heat release that drives the oscillation. Compared to the closed-loop case, this approach has some advantages because it may not require high-fidelity fuel actuators, and could be easier to implement. This paper reports experimental tests of open-loop fuel perturbations to control combustion...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2007, 129(1): 31–37.
Published Online: January 22, 2006
... air shear layer or the fuel line, with less than 1.0% of combustion air, can reduce pressure oscillations amplitude by more than 20 dB . Phase-shifted close-loop air forcing of the flame can reduce the pressure oscillations amplitude by 13 dB . For a constant air flow rate and air inlet temperature...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2005, 127(3): 478–482.
Published Online: June 24, 2005
... to fuel splits or operating conditions unless, of course, pressure oscillations are actually present. We have developed a methodology for ascertaining the stability margin from dynamic pressure data that does not require external forcing and that works even when pressure oscillations have very low...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2004, 126(3): 465–471.
Published Online: August 11, 2004
... on No. 2 diesel fuel (DF2). Emissions, oscillations and lean blowout (LBO) performance on liquid fuel at high, part and no load operating points (pressures of 160, 100, 120 psig, and inlet temperatures of 690, 570, 590°F, respectively) and various pressure drops (ΔP/P) and air fuel ratio conditions were...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2004, 126(2): 271–275.
Published Online: June 7, 2004
... of the combustion chamber. The suggested arrangement leads to a significant extension of the low-pulsation operating regime of the engine. thermoacoustics oscillations damping resonators gas turbines combustion flow instability In modern gas turbines operating with premixed combustion flames...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. October 2006, 128(4): 840–848.
Published Online: March 1, 2004
... of density wave oscillations is analyzed. Density wave oscillations (DWO) are the most frequently observed type of the dynamic instabilities. The DWO is characterized by large amplitudes and a nearly sinusoidal period. A density wave oscillation is a low-frequency oscillation of the mass flow where...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. October 2005, 127(4): 748–754.
Published Online: March 1, 2004
...M. P. Auer; C. Gebauer; K. G. Mösl; C. Hirsch; T. Sattelmayer Modern low-emission premix combustion systems are often susceptible to combustion instabilities. Active instability control (AIC) systems are commonly used to attenuate these oscillations. For the control authority of AIC systems...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2006, 128(2): 264–270.
Published Online: March 1, 2004
... at the (nearly) choked combustor outlet are supposed to be the key feedback mechanism for the observed self-excited pressure oscillations. The experimental study presented here aims at clarifying the role of entropy waves in the occurrence of rumble. A generic air-blast atomizer with a design prone to self...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2003, 125(1): 11–19.
Published Online: December 27, 2002
...T. Sattelmayer Gas turbine combustors are often susceptible to self-excited oscillations, which lead to unacceptable levels of pressure, velocity, and heat release fluctuations. Although instabilities can occur in systems with locally constant equivalence ratio, it is very important to take...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2003, 125(1): 20–27.
Published Online: December 27, 2002
.... , Annaswamy , A. M. , Ghoneim , Z. A. , and Ghoniem , A. F. , 1996 , “ Response of a Laminar Premixed Flame to Flow Oscillations: A Kinematic Model and Thermoacoustic Instability Results ,” Combust. Flame , 106 , pp. 487 – 510 . Dowling, A. P., 1999, “Thermoacoustic Instability,” 6th Int...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2002, 124(2): 239–247.
Published Online: March 26, 2002
...C. O. Paschereit; B. Schuermans; W. Polifke; O. Mattson An experimental method to determine the thermoacoustic properties of a gas turbine combustor using a lean-premixed low emission swirl stabilized burner is presented. To model thermoacoustic oscillations, a combustion system can be described...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. October 2001, 123(4): 779–786.
Published Online: October 1, 2000
...M. Zhu; A. P. Dowling; K. N. C. Bray Combustors with fuel-spray atomizers are susceptible to a low-frequency oscillation, particularly at idle and sub-idle conditions. For aero-engine combustors, the frequency of this oscillation is typically in the range 50–120 Hz and is commonly called “rumble...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. July 2000, 122(3): 412–419.
Published Online: May 15, 2000
... oscillations which must be eliminated before the release of a final combustor design. In order to eliminate the pressure oscillations the location of fuel injection was parametrically evaluated to determine a stable configuration. It was observed that small axial changes in the position of the fuel spokes...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2000, 122(2): 262–268.
Published Online: January 3, 2000
...Stanley S. Sattinger; Yedidia Neumeier; Aharon Nabi; Ben T. Zinn; David J. Amos; Douglas D. Darling Described are sub-scale tests that successfully demonstrate active feedback control as a means of suppressing damaging combustion oscillations in natural-gas-fueled, lean-premix combustors...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2002, 124(1): 20–30.
Published Online: March 1, 1999
...M. Zhu; A. P. Dowling; K. N. C. Bray Most types of combustion-driven devices experience combustion instabilities. For aeroengine combustors, the frequency of this oscillation is typically in the range 60–120 Hz and is commonly called “rumble.” The rumble oscillations involve coupling between...