N_2O对乙烯自点火敏化作用的实验和理论研究  

Experimental and Theoretical Study on the Sensitization of N_2O to Ethylene Auto-Ignition

作　　者：张英佳[1] 孙五川 邓福泉 黄文林 秦晓康 赵倩 黄佐华[1] ZHANG Yingjia;SUN Wuchuan;DENG Fuquan;HUANG Wenlin;QIN Xiaokang;ZHAO Qian;HUANG Zuohua(State Key Laboratory of Multiphase Flows in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2019年第1期86-92,128,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(91741115);陕西省杰出青年基金资助项目(2018JC-002)

摘　　要：为了探究肼类自燃型火箭推进剂热解和氧化组分中不饱和烷烃与氮氧化物间是否存在直接交互作用,对C_2H_4和N_2O混合气的自着火过程进行了实验和理论研究。利用激波管反射激波方法,测量了化学计量比C_2H_4/O_2/N_2O/Ar混合气(N_2O与(O_2+N_2O)的摩尔分数比为0%、50%、80%和100%)在温度为1 214～1 817K、压力为0.12～1.01 MPa下的点火延迟期。实验结果表明,与纯O_2作为氧化剂比较,N_2O替换部分O_2显著降低了C_2H_4的反应活性,延长其点火延迟期,随着N_2O浓度的增加,抑制影响效果变化显著,在N_2O/O_2的摩尔分数比超过50%情况下尤为突出,单O原子N_2O在氧化不饱和烷烃时并未表现出优势。数值模拟结果表明,只有Aramco-Z可在整个研究工况下合理地预测当前实验结果。N_2O和C_2H_4之间并未发生直接化学交互作用,N_2O的添加对C_2H_3与O_2反应速率及活性自由基池浓度的抑制作用是其氧化能力弱于O_2的主要动力学机制。Aiming at probing the direct interaction between unsaturated hydrocarbons and NOx in hydrazine rocket propellant,the auto-ignition process of ethylene (C2H4) and N2O mixtures was studied experimentally and theoretically.The ignition delay time of stoichiometric C2H4/N2O/O2/Ar with blending ratios of N2O/(N2O+O2)=0%,50%,80% and 100% was measured in the reflected shock conditions covering pressure range of 0.12-1.01 MPa and temperature range of 1214-1817 K in a shock tube.Experimental results show that compared to O2,the reactivity of C2H4 is significantly decreased by N2O,resulting in longer ignition delay time,and this inhibition effect increases with the concentration of N2O,meaning that the ignition delay presents a non-linear dependence on N2O addition.Simulation results reveal that only Aramco-Z model shows a reasonable agreement with the measurements.Direct interaction between N2O and C2H4 appears to be not favorable.Longer ignition delay time caused by the addition of N2O is due mainly to the reduction in the reaction rate of C2H3+O2 and the concentration of free radical pool.

关 键 词：N2O O2 C2H4 激波管 

分 类 号：V434[航空宇航科学与技术—航空宇航推进理论与工程]