硼颗粒聚团着火过程研究

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2012, Vol. 33 ›› Issue (12): 2153-2160.

Study of Ignition Process of Boron Particle Agglomeration

FANG Chuanbo¹, XIA Zhixun¹, HU Jianxin², WANG Dequan¹, YOU Jin¹

1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China;
2. College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China

Received:2011-12-20 Revised:2012-02-10 Online:2012-12-25 Published:2012-12-24
Supported by:
National Natural Science Foundation of China (51276194)

Abstract

Abstract:

The ignition process of boron particle agglomerations in boron containing propellant ducted rockets is studied systemically. A one-dimensional model is proposed taking into consideration the gas phase diffusion process in the boron particle agglomeration, and the heat transfer and the mass transfer process between the boron particle agglomeration and the surroundings. The influence of total ambient pressure, gas temperature, oxygen mole fraction, agglomeration radius, agglomeration porosity, boron particle radius on ignition temperature as well as the influence of these factors on ignition delay time are analyzed in detail. The results show that the ignition temperature of boron particle agglomerations is much lower than that for single boron particle. And the ignition temperature decreases with the increase of the agglomeration radius and the oxygen mole fraction, but increases with the increase in the total ambient pressure, the agglomeration porosity and the boron particle radius. The ignition delay time of boron particle agglomerations decreases with the increase in the ambient temperature, the oxygen mole fraction and the agglomeration porosity, while it increases with the increase in the boron particle radius. Under high total ambient pressures, the ignition delay time increases with an increase in the total ambient pressure.

Key words: ducted rocket, boron particle, ignition model, ignition temperature, ignition delay time

CLC Number:

V431

FANG Chuanbo, XIA Zhixun, HU Jianxin, WANG Dequan, YOU Jin. Study of Ignition Process of Boron Particle Agglomeration[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(12): 2153-2160.

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Study of Ignition Process of Boron Particle Agglomeration

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