科研之友
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摘要
If low-content methanol-gasoline blended fuels are utilized in current PFI gasoline engines, formaldehyde emission needs to be intensively evaluated. In this study, a detailed comprehensive methanol oxidation mechanism was developed, based on present reaction rate constant and path information. The influence of CH, CH2(S), and CH2(T) radical species and nitric oxide was considered in the mechanism. Shock-tube and flow-reactor data were used to validate the mechanism. Numerical simulations of all systems were conducted by CHEMKIN-based programs. In order to construct a methanol-gasoline mechanism, an oxidation mechanism of gasoline surrogate was combined with the methanol mechanism. The gasoline surrogate mechanism was formed with iso-octane (iso-paraffin representative), toluene (aromatic representative), and 1-hexene (olefin representative). The methanol-gasoline mechanism was validated by the jet-stirred reactor (JSR) experiment data. The simulation results of the proposed mechanism have a generally good agreement with the experimental data. Sequentially, the Boost engine cycle model was established and coupled with the methanol-gasoline mechanism to simulate the formaldehyde emissions of the low-percent methanol-gasoline blended fuels from a SI engine, and also applied to predict the emissions of the high-percent blended fuels. The experimental data from the SI engine were obtained by the FTIR (Fourier transform infrared) spectrometer. The simulation results of SI engines achieve a good consistency with the experimental results.
- 出版日期2011
- 单位清华大学
