Ignition delays in methane_oxygen mixture in the presence of small amount of iron or carbon nanoparticles

31st International Conference on Equations of State for Matter

Eremin, A.V.^1 ; Gurentsov, E.V.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

关键词: Carbon Nano-Particles;    Ignition delay time;    Ignition delays;    Iron nanoparticles;    Nanoparticle addition;    Oxygen mixtures;    Reflected shock waves;    Stoichiometric mixtures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012085/pdf
DOI  :  10.1088/1742-6596/774/1/012085

来源: IOP

【 摘 要 】

The influence of small additions (0.3-2 ppm) of iron or carbon nanoparticles on ignition delay times in stoichiometric mixture of 20% (methane + oxygen) diluted in argon was investigated. The experiments were performed in 50 mm diameter shock tube behind reflected shock waves. The nanoparticles were synthesized in pyrolysis of 0.5-1% Fe(CO)5and 1-2% of C6H6diluted in argon in the experiment before the ignition test. The residual nanoparticles were pulled into the flow behind incident and reflected shock wave from the shock tube walls and their volume fraction was measured by laser light extinction at the wavelength 633 nm. Additions of 0.3-2 ppm of iron nanoparticles to stoichiometric methane-oxygen mixture resulted in twofold decrease of ignition delays at temperatures below 1400 K relatively to calculated and experimental data for the mixture without nanoparticle addition. At additions of 0.4-1 ppm of carbon nanoparticles to stoichiometric methane-oxygen mixture a weak decrease of ignition delay relatively to the calculated data for the mixture without additives of carbon nanoparticles was observed.