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含能材料  2015 

甲苯、正癸烷点火延迟的激波管实验研究

DOI: 10.11943/j.issn.1006-9941.2015.10.010

Keywords: 甲苯 正癸烷 点火延迟 激波管 自由基浓度

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Abstract:

利用反射型激波管、压力传感器、光电倍增管、示波器等组成的测试系统,通过测量激波压力信号和OH自由基光强信号,在1175~2023 K,压力为0.1 MPa,当量比为0.5、1.0、2.0的条件下,获得了甲苯/氧气/氮气、正癸烷/氧气/氮气的点火延迟时间。在实验中利用超声速气流雾化液态燃料,制备了均匀的燃料气溶胶。通过控制反射激波缝合接触面的运行状态,使实验运行时间延长至15 ms以上。实验结果表明,在相同的点火压力和点火温度下,甲苯的点火延迟时间比正癸烷的长。随着反应初始温度升高,甲苯和正癸烷的点火延迟时间缩短,点火延时的对数与温度倒数成正比。点火过程中的OH自由基荧光强度在不同温度下呈现出不同的变化规律

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