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Received: 2022-10-04

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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.11 P.949-959


Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres

Author(s):  Lian DUAN, Zhixun XIA, Yunchao FENG, Binbin CHEN, Jiarui ZHANG, Likun MA

Affiliation(s):  College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

Corresponding email(s):   chenbinbin11@nudt.edu.cn

Key Words:  Boron combustion, Amorphous boron, Boron-containing propellant, Solid fuel ramjet

Lian DUAN, Zhixun XIA, Yunchao FENG, Binbin CHEN, Jiarui ZHANG, Likun MA. Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres[J]. Journal of Zhejiang University Science A, 2023, 24(11): 949-959.

@article{title="Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres",
author="Lian DUAN, Zhixun XIA, Yunchao FENG, Binbin CHEN, Jiarui ZHANG, Likun MA",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres
%A Lian DUAN
%A Zhixun XIA
%A Yunchao FENG
%A Binbin CHEN
%A Jiarui ZHANG
%A Likun MA
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 11
%P 949-959
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200468

T1 - Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres
A1 - Lian DUAN
A1 - Zhixun XIA
A1 - Yunchao FENG
A1 - Binbin CHEN
A1 - Jiarui ZHANG
A1 - Likun MA
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 11
SP - 949
EP - 959
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200468

In ramjet combustion chambers, carbon dioxide (CO2) produced by the combustion of carbonaceous fuel enters the chamber together with boron agglomerates. In order to investigate the effect of CO2 concentration present in an oxygen-containing atmosphere on the combustion characteristics and oxidation mechanisms of boron agglomerates, we used a laser ignition system, an X-ray diffractometer (XRD), and a thermogravimetric-differential scanning calorimetry (TG-DSC) combined thermal analysis system. Single-particle boron was tested in the laser-ignition experiments as the control group. The ignition experiment results showed that with a fixed O2 concentration of 20%, when the particle temperature reaches the melting point of boron, increasing CO2 content causes the combustion process of boron agglomerates to transition from single-particle molten droplet combustion to porous-particle combustion. Furthermore, XRD analysis results indicated that the condensed-phase combustion products (CCPs) of boron particles in a mixed atmosphere of O2 and CO2 contained B4C, which is responsible for the porous structure of the particles. At temperatures below 1200 °C, the addition of CO2 has no obvious promotion effect on boron exothermic reaction. However, in the laser-ignition experiment, when the oxygen concentration was fixed at 20% while the CO2 concentration increased from 0% to 80%, the maximum temperature of boron agglomerates rose from 2434 to 2573 K, the self-sustaining combustion time of single-particle boron decreased from 396 to 169 ms, and the self-sustaining combustion time of boron agglomerates decreased from 198 to 40 ms. This study conclusively showed that adding CO2 to an oxygen-containing atmosphere facilitates boron reaction and consumption pathways, which is beneficial to promoting exothermic reaction of boron agglomerates at relatively high temperatures.




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