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

被引:13
|
作者
Liu, Tao [1 ]
Bai, Fuqiang [2 ]
Zhao, Zixuan [3 ]
Lin, Yuzhen [4 ]
Du, Qing [1 ]
Peng, Zhijun [5 ]
机构
[1] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Internal Combust Engine Reserch Inst, Tianjin 300072, Peoples R China
[3] Univ Ottawa, Telfer Sch Management, Ottawa, ON K1N 6N5, Canada
[4] Beihang Univ, Sch Energy & Power Engn, Beijing 100083, Peoples R China
[5] Univ Bedfordshire, Fac Creat Arts Technol & Sci, Luton LU1 3JU, Beds, England
关键词
swirl burner; swirl flow; central vortex core; large-eddy simulation; outlet contraction; CFD SIMULATIONS; TURBULENT FLOWS; COMBUSTOR; VISUALIZATION; DYNAMICS; VELOCITY; CHAMBER; FLAMES; RANS;
D O I
10.3390/en10122081
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
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.
引用
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页数:18
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