TY - JOUR
T1 - Development and verification of simplified methane/dimethyl ether mechanism for micro-combustion
AU - Tang, Aikun
AU - Huang, Qiuhan
AU - Li, Yang
AU - Gao, Lingjie
AU - Ni, Qiang
N1 - Generated from Scopus record by KAUST IRTS on 2023-10-22
PY - 2022/2/1
Y1 - 2022/2/1
N2 - In this work, a simplified mechanism for simulating methane/dimethyl ether micro-flames is developed by validating the flame speed and ignition delay time. Towards this goal, DRGEPSA is used to simplify the pure dimethyl ether mechanism proposed by Zhao. Then the simplified mechanism is coupled with the existing pure methane mechanism (kee-58 mechanism) to obtain the blended fuel mechanism. The sensitivity analysis indicates that the chemical reaction HCOOH = HCO + OH is most beneficial to the optimization of the blended fuel mechanism. By adjusting this reactions reaction rate, the dynamic characteristics and applicability of the blended fuel mechanism in the numerical simulation are adjusted, resulting in a simplified mechanism containing 25 species and 96 chemical reactions. The predicted ignition delay time and laminar flame speed are well matched with the experimental results under certain conditions, showing the capability of this simplified mechanism in describing the combustion characteristics. Finally, this mechanism is applied to predict the transition rules of flame structure, flame location, and blowout limit of methane/dimethyl ether flames under micro-scale conditions using a three-dimensional model. A good agreement between calculations and experimental measurements is achieved, demonstrating the reliability of the simplified mechanism developed in the present work.
AB - In this work, a simplified mechanism for simulating methane/dimethyl ether micro-flames is developed by validating the flame speed and ignition delay time. Towards this goal, DRGEPSA is used to simplify the pure dimethyl ether mechanism proposed by Zhao. Then the simplified mechanism is coupled with the existing pure methane mechanism (kee-58 mechanism) to obtain the blended fuel mechanism. The sensitivity analysis indicates that the chemical reaction HCOOH = HCO + OH is most beneficial to the optimization of the blended fuel mechanism. By adjusting this reactions reaction rate, the dynamic characteristics and applicability of the blended fuel mechanism in the numerical simulation are adjusted, resulting in a simplified mechanism containing 25 species and 96 chemical reactions. The predicted ignition delay time and laminar flame speed are well matched with the experimental results under certain conditions, showing the capability of this simplified mechanism in describing the combustion characteristics. Finally, this mechanism is applied to predict the transition rules of flame structure, flame location, and blowout limit of methane/dimethyl ether flames under micro-scale conditions using a three-dimensional model. A good agreement between calculations and experimental measurements is achieved, demonstrating the reliability of the simplified mechanism developed in the present work.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0378382021003507
UR - http://www.scopus.com/inward/record.url?scp=85118508943&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2021.107071
DO - 10.1016/j.fuproc.2021.107071
M3 - Article
SN - 0378-3820
VL - 226
JO - Fuel Processing Technology
JF - Fuel Processing Technology
ER -