4.7 Article

Sensitivity of flame structure and flame speed in numerical simulations of laminar aluminum dust counterflow flames

期刊

COMBUSTION AND FLAME
卷 245, 期 -, 页码 -

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2022.112363

关键词

Aluminum combustion; Counterflow flame; Particle clouds; Flame speed; Heterogeneous combustion

资金

  1. National Natural Science Foundation of China
  2. Hunan Provincial Natural Science Founda- tion of China
  3. China Scholarship Council
  4. [52006240]
  5. [2020JJ4665]
  6. [2021JJ30775]
  7. [201903170201]

向作者/读者索取更多资源

Numerical investigation of aluminum dust counterflow flames is conducted using a two-stage model that considers the effects of interphase heat transfer, phase change, heterogeneous surface reaction, oxide cap growth, homogeneous combustion, and radiation. The model is validated by comparing the results with experimental data, and the flame structure and the role of different factors in the combustion process are analyzed. The study highlights the importance of particle size, interphase heat transfer, and heterogeneous surface reaction in the flame.
Aluminum dust counterflow flames are investigated numerically using a two-stage model including the effects of interphase heat transfer, phase change, heterogeneous surface reaction (HSR), oxide cap growth, homogeneous combustion and radiation. The numerical model is first validated by simulating the alu-minum dust counterflow flames of McGill University [Julien et al., 2017]. The results show that the par-ticle velocity profile is consistent with the experimental results, and the error in the gas phase velocity caused by the use of aluminum particles as tracers in the experiment is analyzed. Then, further valida-tion is conducted by comparison of the flame speed, and the predicted results agree well with the mea-surements. The flame structure of the aluminum dust counterflow flame is analyzed, and intermediate product (AlO) is observed to present a discrete distribution in space due to the nature of heterogeneous combustion. Different terms in the particle energy equation are analyzed, and the results indicate that the HSR plays an important role in the late preheating stage, while the interphase heat transfer domi-nates the rest of the conversion process. Under the assumption of unity Lewis number, the interphase heat/mass transfer models are found to have a great impact on the flame for a particle size smaller than 10 mu m. With increasing particle sizes, the flame speed decreases, and most particles with a diameter of 12 mu m cannot be fully burnt in the flame under the studied conditions. The effect of the strain rate on the flames is investigated with different particle sizes and unstretched reference flame speeds are ob-tained by linear extrapolation of the predicted results. Finally, a sensitivity analysis of the parameters of the heterogeneous surface reaction model is conducted. (c) 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

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