DNS of turbulent swirling premixed flame in a micro gas turbine combustor

Tanaka, Shoichi; Shimura, Masayasu; Fukushima, Naoya; Tanahashi, Mamoru; Miyauchi, Toshio

doi:10.1016/j.proci.2010.07.034

Cited by 40 publications

(33 citation statements)

References 22 publications

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“…Boundary of CTRZ extends to the exit of the hybrid combustor. Heat and active chemical species recirculate to the root of the flame which directly heat and ignite the incoming fuel/oxidant streams and thus improve flame stabilization [4,5]. In the wake of the sudden expansion, two outer recirculation zones (ORZs) formed near the sidewall of combustion chamber [4,5].…”

Section: Validation Of the Numerical Simulationsmentioning

confidence: 99%

“…Among the above technologies, lean premixed combustion is the most promising technology for gas turbine industry in recent years [3]. In lean premixed combustion, fuel and air are premixed to avoid the formation of stoichiometric regions inside the combustion chamber [4]. Comparing to diffusion flame, premixed flames are by nature more susceptible to dynamic instabilities [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, the high levels of turbulence, fast chemistry and complex geometrical features of gas turbine combustion chamber limits its precision [23]. 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].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Validation Of the Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…It is noted that great advances in the development of Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) have occurred due to the large improvement in computing power and the rise of massively parallel architectures [20]. Up to present, the DNS approach still has difficulty dealing with the aeronautical reactive flows due to the large computational resource needed, especially in high Reynold number turbulence flow [21]. Compared with the other two approaches, only large motions are directly resolved while the small scale motions are modeled in the LES approach [21].…”

Section: Introductionmentioning

confidence: 99%

“…Up to present, the DNS approach still has difficulty dealing with the aeronautical reactive flows due to the large computational resource needed, especially in high Reynold number turbulence flow [21]. Compared with the other two approaches, only large motions are directly resolved while the small scale motions are modeled in the LES approach [21]. Therefore, four dimensional time and space parameters of flow and chemical thermodynamics field can be easily accessed by using the LES approach at relatively smaller calculation time [22].…”

Section: Introductionmentioning

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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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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Systematic Analysis Strategies for the Development of Combustion Models from DNS: A Review

Trisjono

Pitsch

2015

Flow Turbulence Combust

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DNS of turbulent swirling premixed flame in a micro gas turbine combustor

Cited by 40 publications

References 22 publications

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

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

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

Systematic Analysis Strategies for the Development of Combustion Models from DNS: A Review

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