Abstract The combustion characteristics of the multiple boron particles with flame interaction are studied systemically. The governing equations with detailed chemical kinetics, condensation of B2O3 and species transportation under different particle distance, size, ambient pressure and arrangement structure are simulated by means of laminar model. The simulation results show that the main heterogeneous reaction is 2B(s)+O2 B2O2, and the main homogeneous reactions are BO + O2 BO2+O and B2O2+OBO + BO2. The highest temperature appears at the particle surface and is mainly controlled by the heterogeneous reaction. The flame structure exhibits spherical shape. Under the conditions of particle spacing of 0.02 μm, 0.03 μm, 0.05 μm, 0.1 μm, 0.25 μm and 0.5 μm, no obvious increasing on the total heterogeneous reaction rate in the interaction zone occurs when the particle distance reaches more than or equal to 0.25 μm. When the spacing is less than or equal to 0.1 μm, the total heterogeneous reaction rate in the interaction zone increases significantly with the reduction of particle spacing. Increasing particle size can promote the temperature and particle combustion rate in the interaction zone. Higher ambient pressure increases the flame temperature. In multiple particle system, the combustion characteristics is similar to that in double particle system.
Highlights A two-dimensional axisymmetric particle combustion model is established to study the flame interaction between particles in boron agglomeration. The influence of key parameters on particle surface combustion rate in the double particle system is firstly obtained. The research results of double particle system are extended to multiple particle system. The dominant mechanism of combustion of boron particle is revealed.
Study on combustion characteristics of boron particles under flame interaction
Acta Astronautica ; 208 ; 311-321
2023-04-18
11 pages
Article (Journal)
Electronic Resource
English
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