Flame transfer function saturation mechanisms in a swirl-stabilized combustor

Bellows, Benjamin D.; Bobba, Mohan K.; Forte, Annalisa; Seitzman, Jerry M.; Lieuwen, Tim

doi:10.1016/j.proci.2006.07.138

Cited by 136 publications

(55 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The output of this quasi-analytical approach are the growth rate of the acoustic modes, their frequency of oscillation and spatial structure as a function of the perturbation amplitude level. For a given frequency and for increasing values of the acoustic velocity amplitude, the gain and phase of the FDF evolve (Balachandran et al, 2005;Bellows et al, 2007;Durox et al, 2009;Schimek et al, 2011;Kim and Hochgreb, 2011). Depending on û , a mode may be found stable or unstable; when the growth rate ω i exceeds damping at small amplitude the mode is unstable and the limit cycle corresponds to the particular value of û for which the growth rate tends to the damping rate.…”

Section: Introductionmentioning

confidence: 99%

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

Silva

Nicoud

Schuller

et al. 2013

Combustion and Flame

137

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

Silva

Nicoud

Schuller

et al. 2013

Combustion and Flame

137

View full text Add to dashboard Cite

“…Approximately, a linear relationship between / and I CL (/) was observed. This domain of / was not measured in the previous investigations of Higgins et al (2001), Santavicca (2003), andNori andSeitzman (2007).…”

Section: Global Heat Release Variation From Oh* CLmentioning

confidence: 59%

“…Hassa et al (2002) observed flame motion by means of OH* CL in a liquid fuel combustor operated at pressures up to 20 bar. In a premixed swirl-stabilized combustor a periodic motion of the flame was observed by Bellows et al (2007). Different techniques for quantifying the phase-averaged motion of the flame are presented and compared in this paper.…”

Section: Introductionmentioning

confidence: 99%

Thermoacoustically driven flame motion and heat release variation in a swirl-stabilized gas turbine burner investigated by LIF and chemiluminescence

et al. 2008

View full text Add to dashboard Cite

Laser-induced fluorescence and chemiluminescence, both phase-locked to the dominant acoustic oscillation, are used to investigate phenomena related to thermoacoustic instability in a swirl-stabilized industrial scale gas turbine burner. The observed sinusoidal phaseaveraged flame motion in axial (main flow) direction is analyzed using different schemes for defining the flame position. Qualitative agreement between experimental data and theoretical analysis of the observed flame motion is obtained, interpreted as originating primarily from variation of the burning velocity. The heat release variation during an acoustic cycle is determined from the sinusoidally varying total OH* chemiluminescence intensity.

show abstract

“…In the past, experimental studies have focused mainly on the response of lean, fully premixed in space and in time, gas-fueled turbulent flames to acoustic oscillations Bellows et al, 2007;Kim et al, 2010a;Schimek et al, 2011). It was shown that the interaction of the flame with vortices caused by the oscillating flow constitutes an important mechanism of nonlinear response.…”

Section: Introductionmentioning

confidence: 99%

“…Acoustically forced fully premixed flames experience only velocity oscillation Bellows et al, 2007;Kim et al, 2010a;Schimek et al, 2011) because the mixture is always and everywhere the same. If the fuel injection system is such that the fuel flow rate is constant and its location is far enough upstream to produce uniform equivalence ratio across the mixing duct, a slowly time-varying velocity field will result also in a slowly varying equivalence ratio associated with the constant fuel flow rate and the unsteady air flow rate Balachandran et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Response of flames with different degrees of premixedness to acoustic oscillations

Kypraiou

Allison

Giusti

et al. 2018

Combustion Science and Technology

View full text Add to dashboard Cite

The response of three flames with different degrees of premixedness (fully premixed, non-premixed with radial, and non-premixed with axial fuel injection) to acoustic oscillations is studied experimentally. The flames were imaged using OH* chemiluminescence and OH planar laser-induced fluorescence at 5 kHz. In addition to a flame kinematics analysis, the amplitude dependence of the transfer function was calculated. The dominant spatial structures of the heat release and their periodicity were examined using the proper orthogonal decomposition (POD) method. The Non-Premixed system with Radial fuel injection (NPR) showed the highest response to acoustic forcing, followed by the fully premixed and the Non-Premixed system with Axial fuel injection (NPA). In addition, the response of the nonpremixed system with radial fuel injection was greater than that of the fully premixed system for various bulk velocities U, global equivalence ratios φ, forcing amplitudes A, and forcing frequencies f . In the fully premixed system, the heat release modulation was mainly through flame surface area modulation, while in the NPR system, both the flame area and the equivalence ratio modulations were found to be important mechanisms of the heat release oscillations. About 70% of the energy of the total fluctuations in the NPR case was contained in the first four POD modes, a percentage that decreased with overall equivalence ratio, but only this dropped to about 40% for the NPA flame. The frequency spectra of the coefficients of the POD modes exhibited peaks at the forcing frequency, with increasing broadband contributions in higher modes and for the NPA flame.ARTICLE HISTORY

show abstract

Flame transfer function saturation mechanisms in a swirl-stabilized combustor

Cited by 136 publications

References 18 publications

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

Thermoacoustically driven flame motion and heat release variation in a swirl-stabilized gas turbine burner investigated by LIF and chemiluminescence

Response of flames with different degrees of premixedness to acoustic oscillations

Contact Info

Product

Resources

About