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Energies 2017, 10(12), 2081; doi:10.3390/en10122081

Large Eddy Simulation Analysis on Confined Swirling Flows in a Gas Turbine Swirl Burner

1
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2
Internal Combustion Engine Reserch Institute, Tianjin University, Tianjin 300072, China
3
Telfer School of Management, University of Ottawa, Ottawa, ON K1N 6N5, Canada
4
School of Energy and Power Engineering, Beihang University, Beijing 100083, China
5
Faculty of Creative Arts, Technologies and Science, University of Bedfordshire, Luton LU1 3JU, UK
*
Authors to whom correspondence should be addressed.
Received: 12 October 2017 / Revised: 13 November 2017 / Accepted: 20 November 2017 / Published: 7 December 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

This paper describes a Large Eddy Simulation (LES) investigation into flow fields in a model gas turbine combustor equipped with a swirl burner. A probability density function was used to describe the interaction physics of chemical reaction and turbulent flow as liquid fuel was directly injected into the combustion chamber and rapidly mixed with the swirling air. Simulation results showed that heat release during combustion accelerated the axial velocity motion and made the recirculation zone more compact. As the combustion was taking place under lean burn conditions, NO emissions was less than 10 ppm. Finally, the effects of outlet contraction on swirling flows and combustion instability were investigated. Results suggest that contracted outlet can enhance the generation of a Central Vortex Core (CVC) flow structure. As peak RMS of velocity fluctuation profiles at center-line suggested the turbulent instability can be enhanced by CVC motion, the Power Spectrum Density (PSD) amplitude also explained that the oscillation at CVC position was greater than other places. Both evidences demonstrated that outlet contraction can increase the instability of the central field. View Full-Text
Keywords: swirl burner; swirl flow; central vortex core; large-eddy simulation; outlet contraction swirl burner; swirl flow; central vortex core; large-eddy simulation; outlet contraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, T.; Bai, F.; Zhao, Z.; Lin, Y.; Du, Q.; Peng, Z. Large Eddy Simulation Analysis on Confined Swirling Flows in a Gas Turbine Swirl Burner. Energies 2017, 10, 2081.

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