Large eddy simulations of isothermal confined swirling flow in an industrial gas-turbine

Bulat, Ghenadie; Jones, W.P.; Navarro‐Martinez, S.

doi:10.1016/j.ijheatfluidflow.2014.10.028

Cited by 38 publications

(18 citation statements)

References 31 publications

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“…A Favre filter is applied to the conservation equations of mass, momentum and energy yields [29]. Separation of the large and small scale energetic motions is achieved as follows:…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Large Eddy Simulation of the PVC Behavior in both Non-Reacting and Reacting Flows with Different Reynold Numbers

Shi¹,

Fu²,

Shen³

et al. 2016

IJHT

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The effects of the Reynold number on the precessing vortex core (PVC) behavior in both non-reacting and reacting flows are numerically studied using a three-dimensional fully compressible large eddy simulation method. The predicted results show that a central toroidal recirculation zone (CTRZ) is generated in the vicinity of the axis of the combustor which is dominated by many small-scale vortices. Meanwhile, two smaller external recirculation zones (ERZs) are established in the vicinity of the sidewall of the combustion chamber. Under combustion conditions, the flow field tends to become complex, and the structure of CTRZ is more irregular compared to that of the non-reacting flow. An increase in the inlet Reynold number enlarges the magnitude of CTRZ and thus produces a more regular and stronger structure of the PVC inside the combustion chamber. Consequently, the breakdown positon of the PVC moves downstream under higher Reynold numbers. The structure of PVCs in the reacting flow mostly located in the regions of the unburned reactants within the per-chamber which is relatively smaller and irregular compared to that in the non-reacting flow. There is a linear increase in pressure oscillations amplitude and frequency with an increase in the inlet Reynold numbers. However, the Strouhal number remains relatively constant in both non-reacting and reacting flows. There is also an anticipated decrease in pressure oscillations and frequency in the reacting flow due to the compressibility effect in the reacting flow.

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“…A Favre filter is applied to the conservation equations of mass, momentum and energy yields [29]. Separation of the large and small scale energetic motions is achieved as follows:…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…A computational fluid dynamics (CFD) pre-processing software code Gambit is employed to establish the modeling and mesh generation in this study [29]. Computational domain includes the model GT combustion chamber and DLE combustor (see Figure 2).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Large Eddy Simulation of the PVC Behavior in both Non-Reacting and Reacting Flows with Different Reynold Numbers

Shi¹,

Fu²,

Shen³

et al. 2016

IJHT

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show abstract

Section: Introductionmentioning

confidence: 99%

“…In consequence, Computational Fluid Dynamics (CFD) approaches are usually needed as an adjunct of experiment in many cases [22]. Reynolds Average Navier-Stokes (RANS) approach is widely used in numerical studies to get mean stationary flows inside the combustion chamber [22]. However, the high levels of turbulence, fast chemistry and complex geometrical features of gas turbine combustion chamber limits its precision [23].…”

Section: Introductionmentioning

confidence: 99%

“…Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) are two mainly alternative numerical solutions in recent years [4]. In Direct Numerical Simulations (DNS) approach, all turbulent flows are simulated by numerically solving the full Navier-Stokes equations [22]. However, the amount of computational resources is still too large for most practical applications [22].…”

Section: Introductionmentioning

confidence: 99%

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LES of Swirl Angle on Combustion Dynamic and NOx Formation in a Hybrid Industrial Combustor

Shi¹,

Fu²,

Shen³

et al. 2016

IJHT

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Impact of diagonal swirler vane angle on combustion dynamic and NOx formation characteristic in a hybrid industrial combustor is numerically studied using a full compressible large eddy simulation approach. The predicted results show that increase the swirler vane angle enlarges the magnitude of the CTRZ and thus the coherent structure and off-axis motions of vortex cores which increase the pressure oscillations amplitude. Phenomenon of combustion instability does not occur due to the introduction of pilot diffusion flame. Formation rate of NOx is relatively slower in pilot diffusion flame, because excess air contained in pilot fuel streams dilutes the flame temperature. Regions with peak flame temperature and maximum formation rate of NOx located in vicinity to the sidewall of combustion chamber especially in the shell side. Proper increase of diagonal swirler vane angle to enlarges the divergence angle of flame and reduces the recirculation of hot gases and combustion products in outer recirculation zones to control peak temperature of flame is an effective means to control NOx emissions for this hybrid industrial combustor. Further increase the diagonal swirler vane angle will have relatively smaller impacts on compressing the NOx emission due to the confinement of combustion chamber.

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An experimental and LES comparison of water- and air-based swirling flow test rigs in vertical and horizontal configurations

2017

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Large eddy simulations of isothermal confined swirling flow in an industrial gas-turbine

Cited by 38 publications

References 31 publications

Large Eddy Simulation of the PVC Behavior in both Non-Reacting and Reacting Flows with Different Reynold Numbers

Large Eddy Simulation of the PVC Behavior in both Non-Reacting and Reacting Flows with Different Reynold Numbers

LES of Swirl Angle on Combustion Dynamic and NOx Formation in a Hybrid Industrial Combustor

An experimental and LES comparison of water- and air-based swirling flow test rigs in vertical and horizontal configurations

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