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Date of Publication:2022-10-07

Journal:物理化学学报

Affiliation of Author(s):能源与动力学院

Volume:32

Issue:9

Page Number:2209-2215

ISSN No.:1000-6818

Abstract: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.

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