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国际能源材料和化学驱动期刊
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN 打印: 2150-766X
ISSN 在线: 2150-7678

国际能源材料和化学驱动期刊

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2018022374
pages 103-114

EFFECT OF AZODICARBONAMIDE PARTICLES ON THE REGRESSION RATE OF HYDROXYL-TERMINATED POLYBUTADIENE (HTPB)-BASED FUELS FOR HYBRID ROCKET PROPULSION

Suhang Chen
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China
Yue Tang
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China
Wei Zhang
School of Chemical Engineering, Nanjing University of Science and Technology 200 Xiaolingwei, Xuanwu District, Nanjing 210094, China
Ruiqi Shen
Nanjing University of Science and Technology
Luigi T. DeLuca
Space Propulsion Laboratory (SPLab), Department of Aerospace Science and Technology, Politecnico di Milano, Milan, I-20156, Italy
Yinghua Ye
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China

ABSTRACT

The details of the burning surface layer can have a great influence on the combustion performance of solid fuels for hybrid propulsion. In composite solid fuels, a substance with a low decomposition temperature or a fast burning rate leaves holes in the initial matrix after decomposition or burning, thus increasing the regressing surface area. Azodicarbonamide (ADCA)/hydroxyl-terminated polybutadiene (HTPB) composite fuels can achieve this kind of mechanism: ADCA decomposes at the temperature of 150–306°C while HTPB decomposes at 417–591°C, thus forming a certain thickness of porous layer after the decomposition of ADCA particles when the fuel burns. However, the gaseous products increase the blocking effect, hindering heat transfer from the flame zone to the fuel surface and suppressing combustion. In this study, we investigate the effects of ADCA on the combustion characteristics of HTPB-based composite solid fuels. The first exothermic peak of thermal gravimetry and differential scanning calorimetry (TG-DSC) tests for ADCA/HTPB fuels decreases, while the second exothermic peak increases in intensity and simultaneously shifts to lower temperatures with increasing ADCA contents. The optimal addition to the HTPB matrix of 3% in mass of ADCA particles enhanced the pre-expansion during combustion and showed an increased regression rate by 41.52%, while 1% and 5% in mass of ADCA increased by 2.99% and –0.40%, respectively, at GOX = 340 kg/m2s, but revealed a decrease to –15.61%, –11.81%, and –25.74%, correspondingly at GOX = 150 kg/m2s. This suggests that appropriate ADCA acts as an effective burning rate modifier by favoring the formation of a certain thickness of porous layer.


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