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Theoretical analysis of flamelet model for supersonic turbulent combustion 被引量:8

Theoretical analysis of flamelet model for supersonic turbulent combustion
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摘要 Being physically intuitionistic and computationally efficient, the flamelet model has obtained increasing attention and becomes popular in numerical simulations of supersonic combustion. However, the flamelet model was firstly built for simulations of the low-speed flows. Therefore it is still unclear whether the assumption of the fiamelet model is reasonable in supersonic combustion. This paper tries to identify the existence of the flamelet mode in supersonic combustion. Firstly, the interaction of the turbulent fluctuation and the flame is discussed, based on which the combustion regime is distinguished. Then the charac- teristic length scale of the turbulent flows and the combustion inside the scramjet combustor are calculated and compared, which are used to identify whether the assumption of the flamelet model is reasonable in supersonic flows. The results show that for premixed combustion, due to the low fluctuation velocity in the recirculafion zone and the shear layer, the assumption of the flamelet model is established for all the flight Mach numbers, while for non-premixed combustion the assumption is also established for most of the flight Mach numbers except for very high Mach number under which the slow reaction mode dominates the combustion. In order to quantitatively examine the combustion mode, numerical calculations are performed to simulate the strut-injection supersonic combustion which has been experimentally investigated in German Aerospace Center. The results show that the supersonic combustion occurs in the fully-developed turbulent regions and the assumption of the flamelet model is established in the whole flow field.
出处 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第1期193-205,共13页 中国科学(技术科学英文版)
基金 supported by the National Natural Science Foundation of China (Grant No. 50906098)
关键词 flamelet model characteristic scale supersonic turbulent combustion thin-reaction-zone mode 小火苗模型;典型规模;超声的狂暴的燃烧; thin-reaction-zone 模式
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参考文献13

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二级参考文献36

  • 1LEE ChunHian.A numerical study of turbulent combustion characteristics in a combustion chamber of a scramjet engine[J].Science China(Technological Sciences),2010,53(8):2111-2121. 被引量:14
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共引文献17

同被引文献28

  • 1LEE ChunHian.A flamelet model for turbulent diffusion combustion in supersonic flow[J].Science China(Technological Sciences),2010,53(12):3379-3388. 被引量:10
  • 2LEE ChunHian.A numerical study of turbulent combustion characteristics in a combustion chamber of a scramjet engine[J].Science China(Technological Sciences),2010,53(8):2111-2121. 被引量:14
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