Comparison of Kinetic Mechanisms for Numerical Simulation of Methanol Combustion in DICI Heavy-Duty Engine 2019-01-0208
In DICI heavy-duty methanol engines the combustion process is mainly in the ignition wave propagation mode. The incylinder pressure, heat release rate, and the emission characteristics are largely governed by the chemical kinetics of the fuel. CFD simulation of such engine combustion process is very sensitive to the used chemical kinetic mechanisms. To perform CFD simulation with a range of operating conditions and cylinder/piston geometry for the design and optimization purpose, it is essential to have a chemical kinetic mechanism that is both accurate and computational inexpensive. In this paper, we report on the evaluation of several chemical kinetic mechanisms for methanol combustion, including large mechanisms, skeleton mechanisms and reduced mechanisms. These mechanisms are evaluated in terms of ignition delay time at DICI engine conditions, laminar flame speed, and multi-dimensional combustion in a real DICI heavy duty engine. The results are compared with experimental data. The mechanisms are evaluated in terms of the accuracy and computational cost.
Mateusz Pucilowski, Rui Li, Shijie Xu, Changle Li, Fei Qin, Martin Tuner, Xue-Song Bai, Alexander A. Konnov
Lund University, Northwestern Polytechnical University