ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (2): 492-500.

• Fluid Mechanics and Flight Mechanics •

### Influencing factors of combustion characteristics of boron particle in forced convective flow

FANG Chuanbo, XIA Zhixun, HU Jianxin, WANG Dequan

1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
• Received:2014-03-06 Revised:2014-06-08 Online:2015-02-15 Published:2014-06-18
• Supported by:

National Natural Science Foundation of China (51276194)

Abstract:

The combustion characteristics of single boron particle in forced convective flow in ramjet engines are investigated systemically. A physical and mathematical model is proposed taking into consideration the gas flow around the particle, the gas diffusion and the surface finite reaction dynamics. The two-dimensional axi-symmetric Navier-Stokes equations with species reactions are solved using the finite volume technique. And the numerical simulation method is validated. Then influencing factors such as the free stream velocity, particle radius, the ambient oxygen mass fraction and the ambient pressure on the combustion characteristics of single boron particle are studied by numerical simulations. And the effect mechanism for each factor is analyzed in detail. The numerical prediction results show that in forced convective flow, both the mass rate and the mass flux of the buring boron particle increase with the increase in the free stream velocity, the particle radius, the ambient oxygen mass fraction and the ambient pressure. A comprehensive analysis of the results is conducted and it is found that the mass flux of the buring boron increases with the stream Reynolds number. Then the mass flux of the buring boron particle in the static atmosphere is modified based on abundant numerical results to describe the combustion characteristics of the boron particle in forced convective flow.

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