ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Combustion of a single magnesium particle in water vapor |
Huang Li-Ya (黄利亚), Xia Zhi-Xun (夏智勋), Zhang Wei-Hua (张为华), Huang Xu (黄序), Hu Jian-Xin (胡建新) |
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract The combustion of magnesium particles in water vapor is of interest for underwater propulsion and hydrogen production. In this work, the combustion process of a single magnesium particle in water vapor is studied both experimentally and theoretically. Combustion experiments are conducted in a combustor filled with motionless water vapor. Condensation of gas-phase magnesia on the particle surface is confirmed and gas-phase combustion flame characteristics are observed. With the help of an optical filter and a neutral optical attenuator, flame structures are captured and determined. Flame temperature profiles are measured by an infrared thermometer. Combustion residue is a porous oxide shell of disordered magnesia crystal, which may impose a certain influence on the diffusivity of gas phases. A simplified one-dimensional, spherically symmetric, quasi-steady combustion model is then developed. In this model, the condensation of gas-phase magnesia on the particle surface and its influence on the combustion process are included, and the Stefan problem on the particle surface is also taken into consideration. With the combustion model, the parameters of flame temperature, flame diameter, and the burning time of the particle are solved analytically under the experimental conditions. A reasonable agreement between the experimental and modeling results is demonstrated, and several features to improve the model are identified.
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Received: 24 December 2014
Revised: 03 April 2015
Accepted manuscript online:
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PACS:
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47.70.Pq
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(Flames; combustion)
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47.50.Cd
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(Modeling)
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82.33.Vx
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(Reactions in flames, combustion, and explosions)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51406231). |
Corresponding Authors:
Huang Li-Ya
E-mail: mvhuang@163.com
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Cite this article:
Huang Li-Ya (黄利亚), Xia Zhi-Xun (夏智勋), Zhang Wei-Hua (张为华), Huang Xu (黄序), Hu Jian-Xin (胡建新) Combustion of a single magnesium particle in water vapor 2015 Chin. Phys. B 24 094702
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