激光激活氧分子作用下CH_4/O_2反应数值模拟

Numerical Simulation of CH_4/O_2 Reaction by Laser Activation of Oxygen Molecule

基于化学动力学模型GRI-Mech3.0机理,利用CHEMKIN4.0软件柱塞流反应器模型模拟了激光作用下CH4/O2燃烧反应过程.结果表明,通过激光作用控制反应过程,利用特定波长的激光将氧分子激发到相应的亚稳态,能够有效减少化学反应延迟时间.在波长762 nm、光强10 kW/cm2(温度1 000 K,压强105Pa)条件下,反应延迟时间由0.23 s减小为0.04 s.特别是在温度及压强较低情况下,反应延迟时间明显减小,具有较好的优化效果.

Based on chemical kinetic mechanism GRI-Mech3.0, CHJO2 combustion under laser-induced activation of oxygen molecule was studied in a plug flow reactor of CHEMKIN 4.0. The results show that excitation of metastable oxygen by laser with a specific wavelength makes it possible to reduce of delay time chemical reaction. Under the wavelength of 762 nm and the light intensity of 10 kW/cm^2 （temperature 1 000 K, pressure 10s Pa）, reaction delay time was reduecd from 0. 23 s to 0.04 s, and aspecially at low temperature and low pressure, it decreased even more obviously.