Combustion dynamics of turbulent swirling flames

Külsheimer, C.; Büchner, H.

doi:10.1016/s0010-2180(02)00394-2

Cited by 155 publications

(82 citation statements)

References 5 publications

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“…These variations of φ give high variations of laminar flame speed and produce periodic penetrations in the CRZ. This instability is selfsustained by pressure waves that propagate upstream [17][18] [20]. The high values of axial velocity fluctuations close to the wall in the CRZ ( Figure 5) are consistent with this analysis.…”

supporting

confidence: 75%

Experimental study of biogas combustion using a gas turbine configuration

et al. 2007

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The use of gaseous fuels issued from waste products or wood pyrolysis will help to fulfill the Kyoto targets concerning Green House Effect gas emissions. However, the use of these fuels in the actual dry low NOx lean premixed combustors is difficult because of their low LHV level (<25% natural gas) and of their composition variability. The aim of the present work is to compare stability combustion domains and flame structures between G20 (100%CH4) and a biogas issued from waste methanisation (61% CH4, 34%CO2 and 5%N2) in a lean gas turbine premixed combustion configuration. A parametrical study has been conducted in a way to characterize the influence of equivalence ratio variation (from 0.8 to 0.6) while mean inlet velocity is kept constant (30 m/s). The experimental burner is composed of a cylindrical quartz combustion chamber (200x800mm) placed in a pressurized and cooled casing with three large optical accesses. Downstream, a converging nozzle with variable section allows the pressure in the combustion chamber to rise up to 0.8Mpa. The combustion air can be pre-heated up to 600°C. The fuel/air mixture injector is an axial swirler injector of 20mm diameter with a coaxial bluff-body. All presented measurements are performed in atmospheric conditions. Laser Doppler Velocimetry provides axial and radial velocities profiles. CH* chemiluminescence measurements are performed with an ICCD camera in order to characterize structure and intensity of the reaction zone. Simultaneous temporal acquisition of chamber pressure and global CH* emission are performed in order to describe flame instability. When fuel is turned from methane to biogas, it is observed that burner operating range is decreased. The performed measurements allow a fine description of the modifications of flame structure and instability frequencies. In particular, reaction zone extent is increased towards recirculation zones. This result can be explained by burning velocity modification resulting from CO 2 dilution.

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confidence: 75%

Experimental study of biogas combustion using a gas turbine configuration

et al. 2007

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“…HereQ andū denote a mean flame power and velocity introduced for scaling purposes. The FTF can be either measured or modeled theoretically or numerically (Ducruix et al, 2000;Külsheimer and Büchner, 2002;Truffin and Poinsot, 2005;Durox et al, 2009;Huber and Polifke, 2009;Kim et al, 2010;Schuermans et al, 2011;Duchaine et al, 2011;Tay-Wo-Chong et al, 2012;Palies et al, 2011b). In a second step, this function can be combined to a model of the system acoustics which is often obtained analytically (Dowling and Stow, 2003;Sattelmayer and Polifke, 2003;Poinsot and Veynante, 2005).…”

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

139

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“…The main component of the setup for the research of the swirling flow structure and the dynamics of cold non-reacting air flow above the biomass layer is a cylindrical channel (inside diameter D = 60 mm, total length L = 600 mm) charged with biomass pellets (total mass 120 g). The channel is composed of diagnostic sections with special openings (2) for insertion of diagnostic tools into the swirling flow at different distances above and below the swirling air supply nozzles (3). The primary air is supplied to the bottom part of channel (1) through the layer of biomass pellets at the average rate of 20-30 l/min, whereas the secondary swirling air is injected through the tangential air nozzles (5 mm in diameter) at the average rate of 30-90 l/min.…”

Section: Methodsmentioning

confidence: 99%

“…Research into the swirling flame flows is of vital importance, since the swirlinduced improvement of flame stability and the swirl-enhanced mixing of the flame components would lead to cleaner combustion and its better efficiency in jet engines, gas turbines and combustors [1][2][3][4][5]. Systematic studies of the swirling flows have shown that the flow structure and stability are highly influenced by the swirl intensity depending on the swirl number (S) in the inlet flow [1].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Swirling Flows and Flame Dynamics

Abricka

Barmina

Valdmanis

et al. 2014

Latvian Journal of Physics and Technical Sciences

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The effect of swirling air on the flow dynamics was investigated for the cold non-reacting flows and the flame arising at thermo-chemical conversion of biomass pellets downstream of a cylindrical channel. Under experimental and numerical investigation was the swirling flow dynamics with the primary axial air supply below a biomass layer and swirling air supply above it. The results indicate that for cold flows the swirling air jet outflow from tangential nozzles leads to the formation of a complex flow dynamics which is influenced both by upstream and downstream air swirl propagation near the channel walls, with correlating swirl-enhanced formation of the upstream and downstream axial flows close to the flow centreline depending on the swirling air supply rate. These axial flows can be completely balanced at their stagnation within the axial recirculation zone. It is shown that at equal boundary conditions for the swirling flame and the cold flows the swirling flow dynamics is influenced by the upstream air swirl-enhanced mixing of the reactants below the air swirl nozzles. This determines the formation of a downstream reaction zone with correlating development of the flow velocity, temperature and composition profiles in the downstream flame regions with improved combustion stability. The low swirl intensity in these regions prevents the formation of a recirculation zone.

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Combustion dynamics of turbulent swirling flames

Cited by 155 publications

References 5 publications

Experimental study of biogas combustion using a gas turbine configuration

Experimental study of biogas combustion using a gas turbine configuration

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

Experimental and Numerical Study of Swirling Flows and Flame Dynamics

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