Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7705377 | International Journal of Hydrogen Energy | 2018 | 14 Pages |
Abstract
Predicting thermal radiation for turbulent combustion highlights the significance of turbulence radiation interactions (TRI). Thermal radiation behaviors of methane/hydrogen flames under elevated pressures are investigated numerically using the developed TRI module integrated into CFD codes. The updated non-gray weighted sum of gray gases model is used to calculate the radiative properties of participating media. TRI effects have been analyzed with 0%-50% volumetric fraction of hydrogen in the methane/hydrogen blended fuels under 1-5Â atm working pressures. Employing the radiation model considering TRI achieves closer predicted consistency to the experimental data. Only thermal radiation makes the flame temperature dropped about 60-140Â K, while the predicted radiative source term calculated with TRI is higher than that without TRI, which results in a colder flame (approximately 13-60Â K lower). The impact of TRI on the radiation behavior is enhanced in hydrogen-enriched high-pressure flame as the predicted radiation heat flux and radiative source term are increased above 25% than that without TRI. On account of TRI effect, the net radiative heat loss increases almost 50% at elevated pressure. The strong radiation of participating media in methane/hydrogen flames under elevated pressures emphasizes the importance of TRI effect on accurate predictions of thermal radiation and NO emission.
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Authors
Xiao Yang, Zhihong He, Shikui Dong, Heping Tan,