乙烷着火化学反应动力学机理研究

• 作 者: 陈毅臻 胡二江 张自航 潘伦 黄佐华
• 机 构: 西安交通大学动力工程多相流国家重点实验室,
• 出 处: 工程热物理学报
• 发表日期: 2015年12期
• 关键词: ethane ignition delay time GRIMech 3.0 chemical kinetic sensitivity analysis

本文利用激波管测量了乙烷在不同压力、温度和当量比下的着火延迟期,并利用CHEMKIN软件结合GRI-Mech3.0机理对预混合气着火过程进行了模拟计算和化学反应动力学分析。结果表明,GRI-Mech 3.0机理不能很好地预测乙烷的着火延迟期。通过对着火过程进行敏感性分析,得出反应C_2H_5+O_2=C_2H_4+HO_2和C_2H_4+H+M=C_2H_5+M对着火延迟期的影响较大,并对其反应速率常数进行了修正。修正后的机理能够较好地改善对乙烷着火延迟期的预测,并同时保持了对层流燃烧速度的准确预测。

In this paper, the ignition delay of ethane at different pressure, temperature and equivalence ratio was measured by shock tube. The combustion process of premixed gas was simulated and analyzed by CHEMKIN software combined with GRI-Mech3.0 mechanism. . The results show that GRI-Mech 3.0 mechanism can not predict the ignition delay of ethane very well. Through the sensitivity analysis of the ignition process, it was found that the reaction C_2H_5 + O_2 = C_2H_4 + HO_2 and C_2H_4 + H + M = C_2H_5 + M greatly affected the ignition delay, and the reaction rate constants were corrected. The revised mechanism can better improve the prediction of ethane ignition delay, while maintaining accurate prediction of laminar flow rate.