Flow Field and Structure of Turbulent High-Pressure Premixed Methane/Air Flames

Griebel, Peter; Ren, Ruiqi; Siewert, P.; Bombach, Rolf; Inauen, Andreas; Kreutner, W.

doi:10.1115/gt2003-38398

Cited by 25 publications

(31 citation statements)

References 3 publications

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“…For highly turbulent flow past a stationary conical flame, experiments demonstrate that the turbulence strength reaches a maximum of approximately 20% of the maximum flow velocity past the flame [10]. This intensity level is in accord with typical values for different types of flows.…”

Section: Changes To Turbulent Velocity Multipliersupporting

confidence: 62%

Benchmarking of Improved DPAC Transient Deflagration Analysis Code

Laurinat

Hensel

2017

Journal of Pressure Vessel Technology

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The transient deflagration code DPAC (Deflagration Pressure Analysis Code) has been upgraded for use in modeling hydrogen deflagration transients. The upgraded code is benchmarked using data from vented hydrogen deflagration tests conducted at the HYDRO-SC Test Facility at the University of Pisa. DPAC originally was written to calculate peak deflagration pressures for deflagrations in radioactive waste storage tanks and process facilities at the Savannah River Site. Upgrades include the addition of a laminar flame speed correlation for hydrogen deflagrations and a mechanistic model for turbulent flame propagation, incorporation of inertial effects during venting, and inclusion of the effect of water vapor condensation on vessel walls. In addition, DPAC has been coupled with CEA, a NASA combustion chemistry code. The deflagration tests are modeled as end-to-end deflagrations. The improved DPAC code successfully predicts both the peak pressures during the deflagration tests and the times at which the pressure peaks.

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Section: Changes To Turbulent Velocity Multipliersupporting

confidence: 62%

Benchmarking of Improved DPAC Transient Deflagration Analysis Code

Laurinat

Hensel

2017

Journal of Pressure Vessel Technology

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“…The experimental set up [20] is shown in Fig. 3; burner nozzle diameter is 25 mm with expansion diameter of 75 mm and with the maximum chamber length of 320 mm.…”

Section: The Psi High-jet Enveloped Flamementioning

confidence: 99%

“…This high-jet enveloped flame was stabilized aerodynamically via the recirculation of hot flue gases, induced by the combustor geometry with sudden expansion, with the burner configurated horizontally [19,20]. The experimental set up [20] is shown in Fig.…”

Section: The Psi High-jet Enveloped Flamementioning

confidence: 99%

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Large-Eddy Simulation of Lean Premixed Turbulent Flames of Three Different Combustion Configurations using a Novel Reaction Closure

Aluri

Muppala²,

Dinkelacker

2007

Flow Turbulence Combust

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This large eddy simulation (LES) study is applied to three different premixed turbulent flames under lean conditions at atmospheric pressure. The hierarchy of complexity of these flames in ascending order are a simple Bunsen-like burner, a suddenexpansion dump combustor, and a typical swirl-stabilized gas turbine burner-combustor. The purpose of this paper is to examine numerically whether the chosen combination of the Smagorinsky turbulence model for sgs fluxes and a novel turbulent premixed reaction closure is applicable over all the three combustion configurations with varied degree of flow and turbulence. A quality assessment method for the LES calculations is applied. The cold flow data obtained with the Smagorinsky closure on the dump combustor are in close proximity with the experiments. It moderately predicts the vortex breakdown and bubble shape, which control the flame position on the double-cone burner. Here, the jet break-up at the root of the burner is premature and differs with the experiments by as much as half the burner exit diameter, attributing the discrepancy to poor grid resolution. With the first two combustion configurations, the applied subgrid reaction model is in good correspondence with the experiments. For the third case, a complex swirl-stabilized burner-combustor configuration, although the flow field inside the burner is only modestly numerically explored, the level of flame stabilization at the junction of the burner-combustor has been rather well captured. Furthermore, the critical flame drift from the combustor into the burner was possible to capture in the LES context (which was not possible with the RANS plus k-ɛ model), however, requiring tuning of a prefactor in the reaction closure.

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“…As shown in the next section this forms an excellent basis for flame length prediction considering additional flame regime effects. Several authors have performed detailed studies on highly turbulent premixed flames [31,32,33,34]. As a result of these investigations it can be concluded that the complex interaction between the turbulent flow field and the flame front and resulting flame front structure can be fairly well represented by means of characteristic dimensionless numbers.…”

Section: Figurementioning

confidence: 99%

Determination and Scaling of Thermo Acoustic Characteristics of Premixed Flames

Alemela

Fanaca

Hirsch

et al. 2010

International Journal of Spray and Combustion Dynamics

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The paper investigates the determination and the scaling of thermo acoustical characteristics of lean premixed flames as used in gas turbine combustion systems. In the first part, alternative methods to characterize experimentally the flame dynamics are outlined and are compared on the example of a scaled model of an industrial gas turbine burner. Transfer matrix results from the most general direct method are contrasted with data obtained from the hybrid method, which is based on Rankine-Hugoniot relations and the experimental flame transfer function obtained from OH*-chemiluminescence measurements. Also the new network model based regression method is assessed, which is based on a n − τ − σ dynamic flame model. The results indicate very good consistency between the three techniques, providing a global check of the methods/tools used for analyzing the thermo acoustic mechanisms of flames. In the second part, scaling rules are developed that allow to calculate the dynamic flame characteristics at different operation points. Towards this a geometric flame length model is formulated. Together with the other operational data of the flame it provides the dynamic flame model parameters at these points. The comparison between the measured and modeled flame lengths as well as the n − τ − σ parameters shows an excellent agreement. NOMENCLATURE

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Flow Field and Structure of Turbulent High-Pressure Premixed Methane/Air Flames

Cited by 25 publications

References 3 publications

Benchmarking of Improved DPAC Transient Deflagration Analysis Code

Benchmarking of Improved DPAC Transient Deflagration Analysis Code

Large-Eddy Simulation of Lean Premixed Turbulent Flames of Three Different Combustion Configurations using a Novel Reaction Closure

Determination and Scaling of Thermo Acoustic Characteristics of Premixed Flames

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