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EFFECT OF DILUTION BY NITROGEN AND/OR CARBON DIOXIDE ON METHANE AND ISO-OCTANE AIR FLAMES

机译:氮和/或二氧化碳的稀释对甲烷和异辛烷气焰的影响

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摘要

The impact of dilution on laminar burning speed of two different fuels (methane and isooc-tane) is studied. In the present study, three different diluents are used nitrogen, carbon dioxide, and a mixture representative of exhaust gases issued from a stoichiometric combustion of methane. Experimental results and PREMIX computations of the CHEMKIN package, using two different kinetic schemes, are presented and compared with literature results, when available. Initial pressure and temperature conditions are respectively 0.1 MPa and 300 K. For both fuels, a larger decrease of the laminar burning speed is obtained for carbon dioxide dilution than for nitrogen dilution. This observation is directly linked to the increase in heat capacity of the dilution gas but also to the carbon dioxide dissociation, even if the heat capacity effect seems to be predominant.
机译:研究了稀释对两种不同燃料(甲烷和异辛烷)的层流燃烧速度的影响。在本研究中,使用了三种不同的稀释剂:氮气,二氧化碳和代表甲烷化学计量燃烧产生的废气的混合物。给出了使用两种不同动力学方案的CHEMKIN软件包的实验结果和PREMIX计算,并与文献结果进行了比较(如果有)。初始压力和温度条件分别为0.1 MPa和300K。对于两种燃料,二氧化碳稀释所产生的层流燃烧速度降低幅度要大于氮气稀释所引起的。该观察结果与稀释气体的热容量增加直接相关,但也与二氧化碳的离解直接相关,即使热容量的影响似乎是主要的。

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