Study of Combustion Characteristics of Magnesium/Sodium Nitrate Pyrotechnics Under Sub-Atmospheric Pressure

In order to study the combustion characteristics and reaction mechanism of luminescent pyrotechnics under sub-atmospheric pressure conditions, low-pressure combustion tests and thermal analysis were performed for magnesium/sodium nitrate pyrotechnics with zero oxygen equilibrium in the pressure rang...

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Bibliographic Details
Published in:Combustion science and technology 2024-06, Vol.196 (8), p.1137-1151
Main Authors: Guo, Zefeng, Ju, Jian, Guan, Hua, Shi, Chengkuan, Li, Zejun
Format: Article
Language:English
Subjects:
Atmospheric pressure
Burning rate
Combustion
Enthalpy
Fireworks
flame structure
Heat transfer
High temperature
Light intensity
Low pressure
Luminous intensity
luminous properties
Magnesium
Magnesium oxide
Military applications
Oxygen
Pressure drop
Pyrotechnics
Reaction mechanisms
Sodium
Sodium nitrates
Superconductors (materials)
Thermal analysis
Weight loss
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Summary:In order to study the combustion characteristics and reaction mechanism of luminescent pyrotechnics under sub-atmospheric pressure conditions, low-pressure combustion tests and thermal analysis were performed for magnesium/sodium nitrate pyrotechnics with zero oxygen equilibrium in the pressure range of 1 kPa~101 kPa. The results reveal that when the pressure drops, the flame height rises, and the flame transitions from a steady-state convergent to a turbulent evanescent flame. Reduced oxygen concentration at low pressure reduces the flame's high temperature response zone, as well as burning speed and luminous intensity. Furthermore, both the light intensity and the burning rate comply with Vier's law. The weight loss increased from 16.3% to 36.7% when the pressure was reduced from atmospheric pressure to 1 kPa, the enthalpy change of reaction decreased from 6.75 kJ/g to 2.45 kJ/g, and the characteristic peak of magnesium oxide at 500 nm in the flame spectrum disappeared at 1 kPa, indicating that the reduction of pressure would affect the degree of reaction of pyrotechnics, leading to the decrease of magnesium oxide content and the decrease of heat release. These scientific findings provide useful insights into the low-pressure combustion behavior of pyrotechnics and support the growing demands for military and civilian applications.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2022.2111661