Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6637203 | Fuel | 2014 | 6 Pages |
Abstract
A mixing model for the calculation of laminar flame speed of lean premixed H2/CO fuel blends was derived through asymptotic analysis coupled with a reduced chemistry mechanism. The model was developed following the similar procedure given for the single component fuel. According to the different dominant effects of H2 in H2/CO/air flame, two separated algebra formulas were given when H2 content was smaller or larger than 15%. Validations of the proposed model, as well as several existing mixing models were conducted against the experimental data of H2/CO premixed flames reported in the literature. Results showed that existing models were either remarkably under-predicted or inconvenient to predict the laminar flame speed of lean premixed H2/CO/air flames. The proposed model predicted well the experimental data over wide ranges of equivalence ratios (0.6-1.0), fuel compositions (1-100% H2 in the fuel blend), and unburned gas temperatures (ambient to 600Â K). In addition, its predictions also agreed well with the simulation results with detailed chemistry and molecular transport over a wide range of pressures (ambient to 20Â atm). It is expected that the proposed mixing model can be cost-effectively used in relevant engineering CFD modeling with acceptable accuracy.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yang Zhang, Yanmei Yang, Zhu Miao, Hai Zhang, Yuxin Wu, Qing Liu,