Experimental characterization and modelling of inflow conditions for a gas turbine swirl combustor

Palm, R.G.; Grundmann, Sven; Weismüller, Michael; Saric, Sanjin; Jakirlić, Suad; Tropea, Cameron

doi:10.1016/b978-008044544-1/50080-7

Cited by 9 publications

(10 citation statements)

References 7 publications

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“…However, this method should be handled with caution. Its straightforward application to any RANS computation, but also to any LES, revealed some interesting anomalies associated with wrong sign of the axial mean velocity gradient, causing consequently a poor prediction of the turbulent stresses [39]. Pierce and Moin introduced additional forcing in the axial direction in order to overcome it [40].…”

Section: Inflow Conditionsmentioning

confidence: 98%

Computational Modelling of Turbulent Mixing in Confined Swirling Environment Under Constant and Variable Density Conditions

Jester-Zürker

Jakirlić

Tropea

2005

Flow Turbulence Combust

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A high-intensity swirling flow in a model combustor subjected to large density variations has been examined computationally. The focus is on the Favre-averaged Navier-Stokes computations of the momentum and scalar transport employing turbulence models based on the differential secondmoment closure (SMC) strategy. An updated version of the basic, high-Reynolds number SMC model accounting for a quadratic expansion of both the pressure-strain and dissipation tensors and a nearwall SMC model were used for predicting the mean velocity and turbulence fields. The accompanied mixing between the annular swirling air flow and the central non-swirling helium jet was studied by applying three scalar flux models differing mainly in the model formulation for the pressure-scalar gradient correlation. The computed axial and circumferential velocities agree fairly well with the reference experiment [So et al., NASA Contractor Report 3832, 1984; Ahmed and So, Exp. Fluids 4 (1986) 107], reproducing important features of such a weakly supercritical flow configuration (tendency of the flow core to separate). Although the length at which the mixing was completed was reproduced in reasonable agreement with the experimental results, the mixing activity in terms of the spreading rate of the shear/mixing layer, that is its thickness, was somewhat more intensive. Prior to these investigations, the model applied was validated by computing the transport of the passive scalar in the non-swirling (Johnson and Bennet, Report NASA CR-165574, UTRC Report R81-915540-9, 1981) and swirling (Roback and Johnson, NASA Contractor Report 168252, 1983) flow in a model combustor.

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Section: Inflow Conditionsmentioning

confidence: 98%

Computational Modelling of Turbulent Mixing in Confined Swirling Environment Under Constant and Variable Density Conditions

Jester-Zürker

Jakirlić

Tropea

2005

Flow Turbulence Combust

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“…Roback and Johnson [34], Monmont and Greenhalgh [28] and Palm [30]. Complementary computational studies using LES (Large-Eddy Simulation) and RANS (Reynolds-Averaged Navier-Stokes) methods have been reported for instance in the studies of Pierce and Moin [32], Tang et al [36], Jester-Zürker et al [17] and Palm et al [31]. The experimental investigations of the can-combustor-like geometries exhibiting mixing of the swirled main flow and the radially injected air jets were the topic of the works of Koutmos [20], Heitor and Whitelaw [13] and Koutmos and McGuirk [21].…”

Section: Introductionmentioning

confidence: 96%

Experimental and Computational Investigations of Flow and Mixing in a Single-Annular Combustor Configuration

Jakirlić

Kniesner

Kadavelil

et al. 2009

Flow Turbulence Combust

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A complementary experimental and computational study of the flow and mixing in a single annular gas turbine combustor has been carried out. The object of the investigation is a generic mixing chamber model, representing an unfolded segment of a simplified Rich-Quick-Lean (RQL) combustion chamber operating under isothermal, non-reacting conditions at ambient pressure. Two configurations without and with secondary air injection were considered. To provide an appropriate reference database several planar optical measurement techniques (time-resolved flow visualisation, PIV, QLS) were used. The PIV measurements have been performed providing profiles of all velocity and Reynolds-stress components at selected locations within the combustor. Application of a two-layer hybrid LES/RANS (HLR) method coupling a near-wall k − ε RANS model with conventional LES in the core flow was the focus of the computational work. In addition to the direct comparison with the experimental results, the HLR performance is comparatively assessed with the results obtained by using conventional LES using the same (coarser) grid as HLR and two eddy-viscosity-based RANS models. The HLR model reproduced all important flow features, in particular with regard to the penetrating behaviour of the secondary air jets, their interaction with the swirled main flow, swirl-induced free recirculation zone evolution and associated precessing-vortex core phenomenon in good agreement with experimental findings.

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“…Gupta et al (1984) found that the swirl number must reach values larger than S > 0.6 for the vortex to break down and to develop a recirculation zone. Considering the results of Palm et al (2005) the high tangential velocities for larger swirl numbers cause a deceleration of the central mass flow which in turn promotes the occurrence of a free stagnation point downstream of a sudden expansion. The combination of swirl and the expansion creates a stable recirculation bubble, while the investigations also show that the swirl alone causes a recirculation already upstream of the expansion.…”

Section: Introductionmentioning

confidence: 98%

Experimental investigation of helical structures in swirling flows

Grundmann

Wassermann

Lorenz

et al. 2012

International Journal of Heat and Fluid Flow

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Experimental characterization and modelling of inflow conditions for a gas turbine swirl combustor

Cited by 9 publications

References 7 publications

Computational Modelling of Turbulent Mixing in Confined Swirling Environment Under Constant and Variable Density Conditions

Computational Modelling of Turbulent Mixing in Confined Swirling Environment Under Constant and Variable Density Conditions

Experimental and Computational Investigations of Flow and Mixing in a Single-Annular Combustor Configuration

Experimental investigation of helical structures in swirling flows

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