Journal of Dalian Maritime University >
2019 , Vol. 45 >Issue 1: 117 - 128
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2019.01.015
Effects of N2, CO2 and H2O dilution on laminar burning velocity of natural gas
Received date: 2018-07-02
Revised date: 2018-08-16
Online published: 2018-08-16
Effects of three dilution gases including nitrogen, carbon dioxide and water vapor on the laminar burning velocity of natural gas under standard atmospheric pressure at 393 K were investigated by using CHEMKIN PRO software, and the chemical kinetic analysis was also carried out. Results show that the laminar burning velocity of natural gas decreases with the increasing dilution ratio, and among these three dilution gases, the effect of carbon dioxide dilution on the laminar burning velocity of natural gas is the most remarkable. The mole fractions of OH, H and O radicals decrease with the increasing dilution ratio, and the laminar burning velocity of natural gas strongly depends on the sum of mole fractions of OH and H. In addition, the physical (including dilution and thermal effects) and chemical effects of three dilution gases on the laminar burning velocity of natural gas were separated by designing several virtual species. The results show that thermal effects of dilution gases on the laminar burning velocities are the most obvious. Without considering the generation of NOx, nitrogen mainly has thermal and dilution effects on the laminar burning velocity of natural gas. The chemical effect of carbon dioxide gradually declines with the increase of dilution ratio, but its dilution and thermal effects rise with the increase of dilution ratio. Contributions of three effects of water vapor remain nearly constant when the dilution ratio varies.
Key words: natural gas; dilution gas; laminar burning velocity; chemical kinetics
ZHANG Zun–hua , ZENG Xuan , LIANG Jun–jie , WANG Liang , LI Ge–sheng . Effects of N2, CO2 and H2O dilution on laminar burning velocity of natural gas[J]. Journal of Dalian Maritime University, 2019 , 45(1) : 117 -128 . DOI: 10.16411/j.cnki.issn1006-7736.2019.01.015
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