卫海桥, 陶康, 高东志, 潘明章, 裴自刚
AuthorsHTML:卫海桥, 陶康, 高东志, 潘明章, 裴自刚
AuthorsListE:Wei Haiqiao, Tao Kang, Gao Dongzhi, Pan Mingzhang, Pei Zigang
AuthorsHTMLE:Wei Haiqiao, Tao Kang, Gao Dongzhi, Pan Mingzhang, Pei Zigang
Unit:天津大学内燃机燃烧学国家重点试验室，天津 300072
Unit_EngLish:State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Abstract_Chinese:以定容燃烧弹为试验平台, 探究了初始压力和掺比对2-甲基呋喃汽油混合燃料火焰传播的影响．结合高速纹影成像, 得到了各工况下的层流火焰传播照片, 分析火焰发展形态, 得到拉伸火焰传播速度及不稳定临界火焰半径等参数, 再根据马克斯坦长度理论, 求解了无拉伸火焰传播速度, 并分析了火焰传播速度与火焰拉伸率的关系．研究结果表明, 随着初始环境压力的升高, 层流火焰传播速度减小, 不稳定临界火焰半径减小, 火焰不稳定性增大．随着2-甲基呋喃在混合燃料中体积分数的增加, 层流火焰传播速度增大, 不稳定临界火焰半径减小, 火焰不稳定性增大．
Abstract_English:The impact of initial pressure and 2-methylfuran(MF)fraction on flame propagation of MF and gasoline blended fuels was researched in a constant volume combustion bomb. Flame morphology was analyzed through the images obtained by high-speed schlieren photography and the stretched flame speeds and unstable flame critical radiuses were obtained. Unstretched flame speeds were calculated through Markstein length theory. The relationship between flame speeds and stretch rate was analyzed. Results show that laminar flame speed and unstable flame critical radius decrease with the increasing of initial pressure while flame instability goes up. Meanwhile，as the fraction of MF in blended fuel is raised，laminar flame speed and flame instability go up while unstable flame critical radius decreases.
Keyword_Chinese:定容燃烧弹; 代用燃料; 2-甲基呋喃; 火焰传播速度; 火焰不稳定性
Keywords_English:constant volume combustion bomb; alternative fuel; 2-methylfuran(MF); flame propagation speed; flame instability

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