Measurements of Laminar Burning Velocities and Markstein Lengths of n-Butanol−Air Premixed Mixtures at Elevated Temperatures and Pressures

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• 作者：Xiaolei Gu ; Zuohua Huang ; Qianqian Li ; Chenglong Tang
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：October 15, 2009
• 年：2009
• 卷：23
• 期：10
• 页码：4900-4907
• 全文大小：1019K
• 年卷期：v.23,no.10(October 15, 2009)
• ISSN：1520-5029

文摘

Measurements of laminar burning velocities and Markstein lengths of n-butanol−air premixed mixtures was made over a wide range of equivalence ratios at initial temperatures of 413, 443, and 473 K and initial pressures of 0.1 and 0.25 MPa using the high-speed schlieren photography and outwardly propagating flame. Effects of laminar flame thickness, thermal expansion ratio, and flame Lewis number on flame stability response were studied. Schlieren photos of flame propagation are recorded. The results show that laminar burning velocities of n-butanol−air premixed mixtures are increased with the increase of initial temperature, and they decrease with the increase of initial pressure. Markstein lengths are decreased with the increase of the equivalence ratio, and they decrease with the increase of initial temperature, and all these indicate that the flame instability is increased with the increase of equivalence ratio, the decrease of initial pressure, and the increase of initial temperature.