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http://hdl.handle.net/10397/89487
Title: | Flame extinction of spherical PMMA in microgravity : effect of fuel diameter and conduction | Authors: | Wu, C Sun, P Wang, X Huang, X Wang, S |
Issue Date: | Dec-2020 | Source: | Microgravity - science and technology : an international journal for microgravity and space exploration , Dec. 2020, v. 32, no. 6, p. 1065-1075 | Abstract: | A series of experiments were conducted in the 3.6-s microgravity drop tower and normal gravity to investigate the effect of solid fuel curvature, conduction, and reradiation on the flame extinction of spherical polymethyl methacrylate (PMMA). In the semi-quiescent microgravity environment, flame extinction was observed if the PMMA diameter was larger than 40 mm, because of a smaller flame conductive heating in larger diameter (i.e., the curvature effect). Compared to the droplet combustion with a low evaporation point and fast heat convection in the liquid phase, the solid fuel has a high pyrolysis point and large transient heat conduction. Thus, the large surface reradiation effectively cools down the fuel surface to promote extinction. Also, as the initial burning duration increases, the conductive cooling into the solid fuel decreases, which delays or prevents the flame extinction in microgravity. The extinction criterion for microgravity flame is explained by the critical mass flux and mass-transfer number. This work helps to understand the curvature effect of solid fuel on flame extinction and the material fire safety in the microgravity spacecraft environment. | Keywords: | Curvature effect Drop tower Heat conduction Plastic fuel Spacecraft fire |
Publisher: | Springer Netherlands | Journal: | Microgravity - science and technology : an international journal for microgravity and space exploration | ISSN: | 0938-0108 | EISSN: | 1875-0494 | DOI: | 10.1007/s12217-020-09829-5 | Rights: | © Springer Nature B.V. 2020 This is a post-peer-review, pre-copyedit version of an article published in Microgravity Science and Technology. The final authenticated version is available online at: https://doi.org/10.1007/s12217-020-09829-5. |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
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63_MST_2020_ug_PMMA_sphere.pdf | Pre-Published version | 1.66 MB | Adobe PDF | View/Open |
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