Characteristics of n-butane weak flames at elevated pressures in a micro flow reactor with a controlled temperature profile
Characteristics of n-butane weak flames at elevated pressures in a micro flow reactor with a controlled temperature profile
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DOI：
10.1016/j.proci.2014.07.029
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Shogo Kikui;T. Kamada;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
中科院分区：
文献类型：
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作者：
Shogo Kikui;T. Kamada;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
首次成功地在压力高达1.2MPa的条件下，利用“压力室”式可控温度微流反应器，以正丁烷为燃料，通过观察弱火焰，研究了压力为0.1- 1.2MPa时的着火特性。在本反应器可以观察到的三种分离的弱火焰中，蓝色火焰仅在高于0.2MPa的压力下观察到，冷火焰仅在高于0.3MPa的压力下观察到。这说明正丁烷的多级氧化过程得到了实验和计算的证实。随着压力的增加，蓝色火焰和冷火焰的位置沿着向低温侧移动。计算结果再现了蓝冷火焰的实验趋势。实验中冷火焰位置处的壁温值与所有研究压力下的计算值一致，并且在1.0MPa下的壁温值与在10巴压缩压力下在快速压缩机中观察到冷火焰时的压缩温度一致。对0.1MPa和1.0MPa下的弱火焰结构进行了比较。高温氧化在0.1MPa下是重要的，而低温氧化在高压下是重要的。在1.0 MPa下，大部分燃料在冷火焰处消耗。在1.2MPa下发现了分离的冷火焰，并在计算中产生了四个阶段的氧化。生成速率分析表明，第一冷火焰是由燃料通过低温氧化形成的，而第二冷火焰是由过氧化氢自由基与H2 O2反应形成的。
The very first successful experiments at elevated pressures up to 1.2 MPa by an “in-pressure-chamber”-type micro flow reactor with a controlled temperature profile are demonstrated.n-Butane was applied to the micro flow reactor and the ignition characteristics at pressures of 0.1–1.2 MPa were investigated by observing weak flames. Among three kinds of separated weak flames which can be observed by the present reactor, the blue flame was only observed at pressures higher than 0.2 MPa and the cool flame was only observed at pressures higher than 0.3 MPa. This interprets the multi-stage oxidation forn-butane was confirmed experimentally and computationally. The positions of the blue and cool flames shifted towards the lower temperature side along with the increase of pressure in the experiment. Computation results reproduced the experimental tendency of the blue and cool flames. The wall temperature value at the cool flame position in the experiment agreed with that in the computation at all pressures studied, and that at 1.0 MPa agreed with the compressed temperature at which the cool flame was observed in the rapid compression machine at a compression pressure of 10 bar. The computational weak flame structure at 0.1 MPa was compared with that of 1.0 MPa. High-temperature oxidation is important at 0.1 MPa while low temperature oxidation is important at high pressures. At 1.0 MPa, most of the fuel is consumed at the cool flame. Separated cool flames were found at 1.2 MPa and four-stage oxidation was produced in the computation. Rate of production analysis indicated that the first cool flame was formed by fuel oxidation through low-temperature oxidation while the second one was formed by reaction of peroxyl radicals with H2O2.