Investigation of flame morphology and thermal characteristics of NEPE solid propellant combustion in an open air environment
During operations, there is a potential risk of solid propellant being dropped, which could cause fire accidents and a severe thermal environment. Therefore, it is essential to investigate the combustion properties of solid propellant in open environments. In this research, a large outdoor experimen...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25008135 |
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| Summary: | During operations, there is a potential risk of solid propellant being dropped, which could cause fire accidents and a severe thermal environment. Therefore, it is essential to investigate the combustion properties of solid propellant in open environments. In this research, a large outdoor experimental platform for solid propellant combustion is established. The flame morphology and thermal characteristics of NEPE propellants of various sizes are studied both experimentally and theoretically. The impacts of flame thickness on temperature measurement errors of bare thermocouples are meticulously analyzed, and the radiant heat flow is estimated. The results indicate that the average burning rates of samples sized Φ66mm × 250 mm (#1), Φ160mm × 190 mm (#2), and Φ104mm × 400 mm (#3) are 0.8, 0.73, and 0.94 mm/s, respectively. The corresponding flame widths reach 24, 52, and 32 cm, while the flame heights are less than 1.5 m. Moreover, the highest flame temperatures measure 2743, 2661, and 2904 K, respectively. To keep the temperature error rate of bare thermocouples below 10 %, the flame thickness should exceed 0.4 m. To limit the error to within 20 %, a minimum flame thickness of 0.2 m is required. The maximum radiant heat fluxes of #1, #2 and #3 are up to 959, 1298, and 1499 kW/m2, respectively. |
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| ISSN: | 2214-157X |