Laminar burning velocity and ignition delay time for premixed isooctane–air flames with syngas addition
Laminar burning velocity and ignition delay time for premixed isooctane–air flames with syngas addition
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DOI：
10.1080/13647830.2016.1215533
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发表时间：
2017-03
影响因子：
1.3
通讯作者：
A. Bhattacharya;A. Datta;M. Wensing
中科院分区：
文献类型：
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作者：
A. Bhattacharya;A. Datta;M. Wensing
在SI发动机相关工况下，研究了合成气与异辛烷不同比例混合对油气混合物层流燃烧速度和着火延迟时间的影响。假设合成气由 50% H2 和 50% CO 组成。使用包含 143 个物质和 643 个反应步骤的骨架机制进行了模拟。已经发现，由于反应混合物的热扩散率增加和火焰反应化学性质的改变，合成气的混合增加了异辛烷的层流燃烧速度。对于30%异辛烷/70%合成气的混合物，层流燃烧速度和点火延迟时间值与纯异辛烷对应的值非常接近。此外，还探讨了废气再循环对 30% 异辛烷/70% 合成气-空气火焰的影响。可以看出，由于再循环废气的稀释而导致的层流燃烧速度的降低可以通过未燃烧气体温度的增加来补偿。已发现废气稀释对 30% 异辛烷/70% 合成气-空气混合物的点火延迟时间的影响可以忽略不计。
The effects of blending syngas in different proportions to isooctane on the laminar burning velocity and ignition delay time of the fuel–air mixture have been studied in SI engine relevant conditions. The syngas is assumed to be composed of 50% H2 and 50% CO. Simulations have been carried out using a skeletal mechanism containing 143 species and 643 reaction steps. It has been found that the blending of syngas augments the laminar burning velocity of isooctane due to increase of the thermal diffusivity of the reactant mixture and alteration in the chemistry of the flame reactions. For the mixture of 30% isooctane/70% syngas, the laminar burning velocity and the ignition delay time values are very close to those corresponding to pure isooctane. Additionally, the effects of exhaust gas recirculation have been explored for the 30% isooctane/70% syngas–air flame. It is seen that the reduction in laminar burning velocity due to the dilution by the recirculated exhaust gas can be compensated by an increase in the unburnt gas temperature. The effect of the exhaust gas dilution on the ignition delay time of 30% isooctane/70% syngas–air mixture has been found to be negligible.