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

Jakirlić, Suad; Kniesner, Björn; Kadavelil, G.; Gnirß, Markus; Tropea, Cameron

doi:10.1007/s10494-009-9229-8

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…For each cell, if φ l in this cell is larger than a specified threshold value φ 0 , it is considered well-resolved and is classified for the LES region; otherwise it is considered under-resolved and is classified for the RANS region. An alternative is to pre-specify the interface between LES and RANS regions, evaluate the resolution near the interfaces and then adjust the interface locations accordingly during the simulations (e.g., [18]). It is also possible to combine the resolution indicators and wall-distance to determine LES/RANS interfaces as in ref.…”

Section: Evaluated Resolution Criteriamentioning

confidence: 99%

Dynamic Evaluation of Mesh Resolution and Its Application in Hybrid LES/RANS Methods

Xiao

Jenny

2014

Flow Turbulence Combust

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In this work, we investigate a resolution evaluation criterion based on the ratio between turbulent length-scales and grid spacing within the context of dynamic resolution evaluation in hybrid LES/RANS simulations. A modified version of the commonly used length-scale criterion is adopted. The modified length-scale criterion is evaluated for a plane channel flow and compared to the criterion based on two-point correlations. Simulation results show qualitative agreement between the two criteria and physical predictions from both resolution indicators. These observations are confirmed by simulations of flows over periodic hills. It is further demonstrated that the length-scale based criterion is relatively less sensitive on variation of model parameters compared to criteria based on resolved percentage of turbulent quantities. The improved resolution criterion is applied in a dual-mesh hybrid LES/RANS solver. Numerical simulations with the hybrid solver suggest that the interactions between the length-scale resolution indicator and the solution are moderate, and that favorable comparisons with benchmark results are obtained. In summary, we demonstrate that the modified length-scale based resolution indicator performs satisfactorily in both pure LES and hybrid simulations. Therefore, it is selected as a promising candidate to provide reliable predictions of resolution adequacy for individual cells in hybrid LES/RANS simulations.

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Section: Evaluated Resolution Criteriamentioning

confidence: 99%

Dynamic Evaluation of Mesh Resolution and Its Application in Hybrid LES/RANS Methods

Xiao

Jenny

2014

Flow Turbulence Combust

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“…It was found that the PVC can enhance the fuel-air mixing [2] burned-unburned gases mixing [3] and it interacts with the thermo-acoustic oscillations of the flame [4]. PVCs are always encountered at isothermal conditions in gas turbine combustors [5][6][7][8]. In reacting conditions PVCs do not encountered in some particular combustors, or flame operating conditions [9,10].…”

Section: Introductionmentioning

confidence: 99%

Detached eddy simulation of non-reacting swirling flow in a vortex burner

Mansouri¹,

Boushaki²,

Aouissi³

2017

IJHT

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An unconfined high turbulent swirling flow is investigated using Detached Eddy Simulation (DES) in a premixed vortex burner. The burner operates with propane-air mixture at high swirl number Sn = 1.05 under atmospheric pressure. In this analysis, the focus of the investigation is the isothermal flow and its expansion at the burner exit. Comparisons of experimental data show that the DES results are capable of predicting the unsteady flow structure and mean velocity profiles. DES results show that the swirling flow is responsible of the formation of a recirculation zone (CRZ) in the center of the burner exit. A helical precessing vortex core (PVC) is detected in the inner shear layer (ISL). Phase-angle analysis of the instantaneous flow field shows the presence of unsteady stagnation points strongly associated with PVC. In addition, phase-angle analysis of the radial profiles of the instantaneous velocities (u, w) is employed to clarify better the instantaneous flow field. The vortex core inside the PVC is analyzed using two slices perpendicular to its axis. It is found that the vortex core is characterized by the limits of its circumferential velocity u(R) and its radius R.

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“…The turbulent flow and flame dynamics within a lean direct fuel injection (LDI) multi-swirler gas turbine combustor were studied by using laser Doppler velocimetry (LDV), particle imaging velocimetry (PIV) and large eddy simulation (LES) (Fureby et al 2007) . The flow structure in a Rich burn, Quick quench, Lean burn (RQL) combustor were observed by PIV (Endo et al 2012) and both PIV and a hybrid LES/RANS (Jakirlic et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Investigations of Combustion Performance in LPP Combustor

Yan¹,

Liu²,

Li³

et al. 2017

JAFM

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A Lean Premixed Prevaporized (LPP) low-emission combustor which is applied with the combustion technology of staged lean fuel is developed. To study the cold flow dynamics and the combustion performance of the LPP combustor, both experimental tests using the Particle Image Velocimetry (PIV) to quantify the flow dynamics and numerical simulation using the Fluent software are conducted respectively. To investigate the emissions of the LPP combustor, four kinds of inlet conditions (viz. 7%, 30%, 85% and 100% F ∞ (Thrust Force)) were conducted using numerical simulation. Numerical results are in good agreement with the experimental data. Results show that:1) a Primary recirculation zone (PRZ), a Corner recirculation zone (CRZ) and a Lip recirculation zone (LRZ) exist in the LPP combustor, and the velocity gradients between pilot swirling flow and primary swirling flow have contributed to the exchanges of mass, momentum and energy. 2) With the decrease of thrust force, NO mass fraction, CO2 mass fraction and total pressure losses at the exit of LPP combustor fall gradually. 3) Thermal NO formation rate closely relate to the zone area where gas temperature overruns 1900K and the maximum temperature in LPP combustor. 4) The combustion performance of the LPP combustor proposed in this paper is very well, and through comparative analysis with four kins of typical gas tubine combustor, the NO emission is very low and is equivalent to the CAEP6 43.87%.

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

Cited by 12 publications

References 28 publications

Dynamic Evaluation of Mesh Resolution and Its Application in Hybrid LES/RANS Methods

Dynamic Evaluation of Mesh Resolution and Its Application in Hybrid LES/RANS Methods

Detached eddy simulation of non-reacting swirling flow in a vortex burner

Investigations of Combustion Performance in LPP Combustor

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