Analysis of influence factors on flame speed under O2/CO2 atmosphere

作者：Zhong Xiaojiao^*; Liu Hao; Zhao Ran; Wang Zijian; Hu Han; Yan Zhiqiang; Qiu Jianrong

来源：Proceedings of the CSEE, 2011, 31(23): 54-60.

• Chemical kinetic
• Detailed chemical kinetic
• Equivalence ratios
• Flame propagation
• Flame speed
• Influence factors
• Initial pressure
• Laminar flame speed
• n-Alkanes
• Positive effects

The flame propagation characteristic of hydrocarbons has a significant relationship with high CO2 concentrarion in an O2/CO2 atmosphere. Laminar flame speed of C1~C7 n-alkanes were studied by detailed chemical kinetic models for O2/CO2 atmosphere, O2/N2 atmosphere and O2/CO2/AR atmosphere respectively. The equivalence ratios were varied from 0.6 to 1.4 for initial pressure p=105 Pa, initial temperature T=298 K. The effects of equivalence ratio, O2 concentration, CO2 concentration and atmospheres on flame speed were explored. Results show that flame speed increases with equivalence ratio in fuel lean region, then decreases in the fuel rich region, and the maximum flame speed appears at equivalence ratio 1.0 or 1.1. For the same O2 concentration, flame speed in an O2/CO2 atmosphere is markedly lower than that in O2/N2, which reveals that CO2 has a negative effect on flame propagation. Under O2/CO2/AR atmophere, flame speed decreases with increasing CO2 concentration, when O2 concentration remains unchanged. Besides, improving the O2 concentration in O2/CO2 atmosphere can increase flame speed, having a positive effect on n-alkanes combution process.

• 出版日期2011
• 单位华中科技大学