Flame spread over thin circular PMMA rods
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866910846931697664 |
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| author | B V, Manu Kumar, Amit |
| author_facet | B V, Manu Kumar, Amit |
| contents | In the present article, series of opposed flow, downward flame spread experiments are conducted using 80 mm long cast PMMA cylinders of 1 mm and 0.5 mm diameters at normal and micro gravity environments. All the experiments are conducted at 21 % of oxygen by volume in nitrogen at 1 atmospheric pressure with varying the opposed flow speed from 0 cm/s to 25 cm/s. Flame spread rate, flame shape, preheating, and pyrolysis parameters are observed and analysed by tracking the leading edge of the flame by digital image processing, measuring flame field temperatures, schileren imaging and microscopic observation of burnt solid cones. It is concluded from the study that, flame spreads faster in microgravity for all diameters and opposed flows considered in the study, because of longer preheating length which is confirmed by temperature measurement using 50 microns thermocouples in a flame field. The thinner the fuel faster the flame spread rate because of curvature effect and reduced thermal inertia. In normal gravity, the flame spread rate reduces very slightly with increasing opposed flow while in micro |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_08378 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Flame spread over thin circular PMMA rods B V, Manu Kumar, Amit Fluid Dynamics In the present article, series of opposed flow, downward flame spread experiments are conducted using 80 mm long cast PMMA cylinders of 1 mm and 0.5 mm diameters at normal and micro gravity environments. All the experiments are conducted at 21 % of oxygen by volume in nitrogen at 1 atmospheric pressure with varying the opposed flow speed from 0 cm/s to 25 cm/s. Flame spread rate, flame shape, preheating, and pyrolysis parameters are observed and analysed by tracking the leading edge of the flame by digital image processing, measuring flame field temperatures, schileren imaging and microscopic observation of burnt solid cones. It is concluded from the study that, flame spreads faster in microgravity for all diameters and opposed flows considered in the study, because of longer preheating length which is confirmed by temperature measurement using 50 microns thermocouples in a flame field. The thinner the fuel faster the flame spread rate because of curvature effect and reduced thermal inertia. In normal gravity, the flame spread rate reduces very slightly with increasing opposed flow while in micro |
| title | Flame spread over thin circular PMMA rods |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2407.08378 |