Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

Arndt, Christoph M.; Severin, Michael; Dem, Claudiu; Stöhr, Michael; Steinberg, Adam M.; Meier, Wolfgang

doi:10.1007/s00348-015-1929-3

Cited by 50 publications

(41 citation statements)

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“…Particle image velocimetry (PIV) is the de facto standard 2D velocity measurement technique in GTC-relevant flows (e.g. Fureby et al (2007) ;Stopper et al (2013); Temme et al (2014); Arndt et al (2015); Boxx et al (2015); Cosic et al (2015); Caux-Brisebois et al (2014)). However, multi-kHz PIV measurements from diode-pumped solidstate lasers typically generate relatively low signal compared to conventional pulsed lasers, while highpressure liquid-fueled combustion generates high background luminosity from flame chemiluminescence and soot.…”

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confidence: 99%

Development and evaluation of gappy-POD as a data reconstruction technique for noisy PIV measurements in gas turbine combustors

2016

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How to cite TSpace itemsAlways cite the published version, so the author(s) will receive recognition through services that track citation counts, e.g. Scopus. If you need to cite the page number of the author manuscript from TSpace because you cannot access the published version, then cite the TSpace version in addition to the published version using the permanent URI (handle) found on the record page.This article was made openly accessible by U of T Faculty. Please tell us how this access benefits you. Your story matters. Experiments in Fluids manuscript No. (will be inserted by the editor)Development and evaluation of Gappy-POD as a data reconstruction technique for noisy PIV measurements in gas turbine combustorsReceived: date / Accepted: date Abstract Low signal-to-noise in particle image velocimetry (PIV) measurements in systems such as high pressure gas turbine combustors can result in significant data gaps that negatively affect subsequent analysis. Here, gappy proper orthogonal decomposition (GPOD) is evaluated as a method of filling such missing data. Four GPOD methods are studied, including a new method that utilizes a median filter (MF) to adaptively select whether a local missing data point is updated with a new guess at each iteration. These methods also are compared against local Kriging interpolation. The GPOD methods are tested using PIV data without missing vectors that were obtained in atmospheric pressure swirl flames. Parameters studied include the turbulence intensity, amount of missing data, and he amount of noise in the valid data. Two criteria to check for GPOD convergence also were investigated.The MF method filled in the missing data with the lowest error across all parameters tested, with approximately one-third the computational cost of Kriging. Furthermore, the accuracy of MF GPOD was relatively insensitive to the quality of the convergence criterion. Therefore, compared to the three other GPOD methods and Kriging interpolation, the MF GPOD method is an effective method for filling missing data in PIV measurements in the current gas turbine combustor flows.

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confidence: 99%

Development and evaluation of gappy-POD as a data reconstruction technique for noisy PIV measurements in gas turbine combustors

2016

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“…The KIT-Burner is described in detail in [40] and [41] , therefore only a brief presentation of its main features is given here.…”

Section: Methodsmentioning

confidence: 99%

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Kraus

Selle

Poinsot

2018

Combustion and Flame

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Large eddy simulations (LES) of combustion instabilities are often performed with simplified thermal wall boundary conditions, typically adiabatic walls. However, wall temperatures directly affect the gas temperatures and therefore the sound speed field. They also control the flame itself, its stabilization characteristics and its response to acoustic waves, changing the flame transfer functions (FTFs) of many combustion chambers. This paper presents an example of LES of turbulent flames fully coupled to a heat conduction solver providing the temperature in the combustor walls. LES results obtained with the fully coupled approach are compared to experimental data and to LES performed with adiabatic walls for a swirled turbulent methane/air burner installed at Engler-Bunte-Institute, Karlsruhe Institute of Technology and German Aerospace Center (DLR) in Stuttgart. Results show that the fully coupled approach provides reasonable wall temperature estimations and that heat conduction in the combustor walls strongly affects both the mean state and the unstable modes of the combustor. The unstable thermoacoustic mode observed experimentally at 750 Hz is captured accurately by the coupled simulation but not by the adiabatic one, suggesting that coupling LES with heat conduction solvers within combustor walls may be necessary in other configurations in order to capture flame dynamics.

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“…With fast velocity oscillations, and equivalent short wavelength equivalence ratio fluctuations, uniform mixing may be achieved by the time the mixture reaches the flame. If the fuel injection system additionally undergoes flow rate oscillations, or if its location is close enough to the flame so that the equivalence ratio has both temporal and spatial fluctuations (equivalence ratio changing in space at the scale of the flame), then the response of the flame may be very different (Arndt et al, 2015;Han et al, 2015;Kim et al, 2010c;Kypraiou et al, 2016). The amplitude of the equivalence ratio, or mixture fraction, fluctuations is an important mechanism of nonlinear response, because it affects the nonlinear dependence of the heat release rate on the equivalence ratio (Kim et al, 2010b).…”

Section: Introductionmentioning

confidence: 99%

“…Spatially resolved transfer functions of forced stratified flames (the term "stratified" implying equivalence ratio fluctuations within the nominal flammability limits of premixed flame propagation), estimated from high-speed chemiluminescence images, suggested that the location and magnitude of the fluctuation along the flame branches were affected by the stratification ratio (Han et al, 2015). An experimental analysis of thermoacoustic instabilities in a gas turbine model combustor by Arndt et al (2015) revealed that the thermoacoustic oscillations were accompanied by phase-dependent variations in the mixture fraction and the fuel mole fraction in the inflowing jet and in the low part of the inner recirculation zone (IRZ), while small variations were observed on the upper side of the IRZ and outer recirculation zone (ORZ).…”

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

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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

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Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

Abstract: Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements Experiments in Fluids 56 (2015)

Cited by 50 publications

References 81 publications

Development and evaluation of gappy-POD as a data reconstruction technique for noisy PIV measurements in gas turbine combustors

Development and evaluation of gappy-POD as a data reconstruction technique for noisy PIV measurements in gas turbine combustors

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Response of flames with different degrees of premixedness to acoustic oscillations

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