Decoupling Methodology: An Effective Way for the Development of Reduced and Skeletal Mechanisms

作者：Chang Ya-Chao; Jia Ming^*; Fan Wei-Wei; Li Yao-Peng; Liu Hong; Xie Mao-Zhao

来源：Acta Physico - Chimica Sinica, 2016, 32(9): 2209-2215.

DOI：10.3866/PKU.WHXB201605262

• Reduced/skeletal mechanism
• Decoupling methodology
• Ignition delay
• Laminar flame speed
• Primary reference fuel

Reduced and skeletal mechanisms with high fidelity are urgently required for multi-dimensional computational fluid dynamics (CFD) combustion simulations. In this study, a series of reduced mechanisms were obtained by reducing a detailed mechanism of primary reference fuel (PRF) using the directed relation graph aided error propagation and sensitivity analysis (DRGEPSA) method for different reduction targets. By analyzing the structures of the reduced mechanisms, it is found that the mechanism structure significantly changes with the variation of the reduction target. Then, the performance of the reduced mechanism is evaluated based on the uncertainty quantification. It indicates that a small relative error should be used in the mechanism reduction method to avoid distorted predictions from the reduced mechanisms. Finally, the decoupling methodology is proposed to construct the skeletal mechanism of PRF. The results show that both the ignition delay time and the laminar flame speed can be satisfactorily reproduced by the skeletal mechanism with a detailed H-2/CO/C-1 and a skeletal C-4-C-n sub-mechanism.

• 出版日期2016-9-15
• 单位大连理工大学