Numerical study on the effects of diluents on laminar burning velocity of methane-air flames (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Numerical study on the effects of diluents on laminar burning velocity of methane-air flames (PDF)
- 发表刊物：
- Energy & Fuels
- 摘要：
- Effect of diluents on laminar burning velocity of premixed methane-air-diluents flame was numerically studied by using the Chemkin package. The mechanisms of dilution, thermal-diffusion and chemical effects of diluents on laminar burning velocity were analyzed quantitatively at different dilution ratios for different diluents. Results show that laminar burning velocity is decreased in the order from helium, argon, nitrogen and carbon dioxide. In the case of N2, the thermal-diffusion effect and chemical effect can be negligible and the decrease of laminar burning velocity is largely caused by the dilution effect. Dilution effect, thermal-diffusion effect and chemical effect of CO2 suppress the laminar burning velocity where the dilution effect plays a dominant effect among them. For helium and argon diluents, chemical effect can be negligible and thermal-diffusion effects enhance the laminar burning velocity. Therefore, dilution effect has much larger suppression effect on decreasing the laminar burning velocity to counteract the thermal-diffusion effect of helium and argon. An empirical formula of laminar burning velocity that takes into account of adiabatic flame temperature and thermal diffusivity is obtained. Good correlations between laminar burning velocity and mole fraction of H+OH at the position of maximum mole fraction of H radical in the flame are also demonstrated. Laminar burning velocity has the same tendency with the product of thermal-diffusion term and chemical reaction term as a function of dilution ratio for different diluents. Adiabatic flame temperature plays a dominant influence on laminar burning velocity and thermal diffusivity does a secondary influence for methane-air-diluents flames.
- 合写作者：
- Hu EJ, Jiang X, Huang ZH, Iida N
- 卷号：
- 2012
- 页面范围：
- 27(6): 4242-4252
- 是否译文：
- 否
- 发表时间：
- 2012-07-20