氢氧发动机C/SiC复合材料喷管延伸段设计研究  

Design of C/SiC Composite Material Nozzle Extension for Hydrogen-Oxygen Rocket Engine

作　　者：杨岩 王朝晖[1] 李伟[2] 王松[2] 王晓丽[1] 谢恒[1] YANG Yan;WANG Zhaohui;LI Wei;WANG Song;WANG Xiaoli;XIE Heng(Beijing Aerospace Propulsion Institute,Beijing 100076,China;National University of Defense Technology,Changsha 410073,China)

机构地区：[1]北京航天动力研究所,北京100076 [2]国防科技大学,长沙410073

出　　处：《载人航天》2020年第3期368-373,共6页Manned Spaceflight

基　　金：载人航天预先研究项目(050101)。

摘　　要：为推动C/SiC复合材料在液体火箭发动机喷管延伸段上的应用,基于国内C/SiC复合材料抗氧化烧蚀性能及预制体成型方案,综合考虑燃气热环境、喷管效率以及结构稳定性,对喷管结构进行了详细优化设计,设计的C/SiC喷管壁厚最薄处仅1.5 mm,结构质量仅为18 kg,相比螺旋管束式排放冷却喷管减重约55%。模态仿真结果表明:设计生产的C/SiC喷管,一阶模态频率为26.941 Hz;材料弹性模量对喷管模态频率影响较大;通过大端增厚对提升喷管模态频率效果有限,必要时可对大端出口翻边,提高其动力学稳定性。To promote the application of C/SiC composite material in the nozzle extension of liquid rocket engine and considering the gas thermo-environment,the nozzle efficiency and the structural stability,the C/SiC nozzle structure was designed and optimized according to the anti-oxidation and ablation performance of C/SiC composite materials and the scheme of prefabricate.The designed wall thickness was only 1.5 mm in the thinnest part of the nozzle and the weight was only 18 kg,which was about 55%less than that of the metal nozzle.The modal simulation results showed that the first-order modal frequency of the C/SiC nozzle designed and produced in this paper was 26.941 Hz.The elastic modulus of the material had a great influence on the modal frequency of the nozzle.Although thickening at the outside of the nozzle had limited effects on improving the modal frequency,flanging in the nozzle exit could improve the natural frequency.

关 键 词：氢氧发动机 C/SIC复合材料 喷管延伸段 结构模态 

分 类 号：V434[航空宇航科学与技术—航空宇航推进理论与工程]