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丙烷-空气-稀释气层流燃烧速率测定 被引量:4

Measurement of Laminar Burning Velocities and Markstein Lengths of Propane-Air-Diluent Premixed Flames
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摘要 利用高速纹影摄像法和球型发展火焰研究了常温常压下丙烷-空气,丙烷-空气-稀释气预混层流燃烧特性,获得了不同稀释系数(0、10%、20%、30%)和燃空当量比(0.6~2.0)下混合气的层流燃烧速率和马克斯坦长度值,分析了拉伸对火焰传播速率的影响。结果表明:丙烷-空气混合气的无拉伸火焰传播速率和无拉伸层流燃烧率在当量比1.1时达到最大值,随当量比的增加,马克斯坦长度值降低,火焰前锋面不稳定性趋势增加。当量比为1.4时,马克斯坦长度值由正值转为负值。丙烷-空气-稀释气混合气随稀释系数的增加,火焰传播速率和层流燃烧速率降低,在当量比小于1.4时,随稀释系数的增加,马克斯坦长度值增加,火焰前锋面的稳定性趋势增加。有无稀释气时无拉伸层流燃烧速率的比值仅与稀释系数有关并成线性关系而与混合气浓度无关。 Measurement of laminar burning velocity of propane-air mixtures with nitrogen as the diluent was made at room temperature and atmospheric pressure under different equivalence ratios and dilution ratios based on the spherically expanded flame.The results show that for propane-air mixtures,the unstretched flame propagation speed and the unstretched laminar burning velocity reach their maximum values at the equivalence ratio of 1.1.Markstein length decreases with the increase of equivalence ratio,indicating th...
出处 《内燃机学报》 EI CAS CSCD 北大核心 2008年第6期525-532,共8页 Transactions of Csice
基金 国家自然科学基金重点项目(50636040 50521604) 国家重点基础研究发展规划资助项目(2007CB210006)
关键词 丙烷 稀释气体 层流燃烧速率 马克斯坦长度 Propane Dilution Laminar burning velocity Markstein length
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