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首页> 外文会议>High temperature ceramic matrix composites 8 >DEVELOPMENT OF FULL SCALE RAMJET NOZZLE WITH C/SiC CERAMIC MATRIX COMPOSITE
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DEVELOPMENT OF FULL SCALE RAMJET NOZZLE WITH C/SiC CERAMIC MATRIX COMPOSITE

机译：C / SiC陶瓷基复合材料全尺寸RAMJET喷嘴的研制

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In order to fulfill the requirement, there exists challenging problems in the development of C/SiC Ceramic Matrix Composite for the ramjet nozzle due to its harsh thermal-chemical and mechanical working environment. Investigation has been performed to develop the full scale ramjet nozzle. Firstly, the low pressure failure of the hydraulic pressure for the C/SiC nozzle is due to both the low strength low density of throat and stress concentration of throat. Effective measures have been taken to solve this problem. Secondly, the three-dimensional needled C/SiC composite nozzle can work safely under the oxygen-rich combustion environment of the ramjet for long test duration. No obvious damage and ablation were observed in the entrance and divergent section of the composite nozzle. Thermochemical ablation is the dominated ablation mechanism for the nozzle throat. The severest ablation and damage was founded in the convergent section of the nozzle. Thermochemical ablation and thermal-mechanical erosion were suggested as ablation mechanism for the convergent section of the nozzle. Hence for the safety and reliability of the nozzle, design has been modified to accommodate different working conditions. Lastly, the convergent angle of nozzle has little effect on solid phase deposition property. Both the shock wave in the divergent section of nozzle, in which the gas of divergent section is under-expanded, and C/C-SiC composite of ramjet combustor have significant effects on solid phase deposition property under the current ramjet working conditions.
机译：为了满足该要求，由于冲压化学喷嘴的苛刻的热化学和机械工作环境，在用于冲压喷嘴的C / SiC陶瓷基复合材料的开发中存在挑战性的问题。已经进行了研究以开发全尺寸冲压喷射喷嘴。首先，C / SiC喷嘴的液压压力低故障是由于喉部强度低，密度低和喉部应力集中所致。已经采取有效措施来解决该问题。其次，三维针刺C / SiC复合喷嘴可以在冲压喷气机的富氧燃烧环境下安全工作，并且测试时间较长。在复合喷嘴的入口和发散部分没有观察到明显的损坏和烧蚀。热化学烧蚀是喷嘴喉的主要烧蚀机制。在喷嘴的会聚部分发现了最严重的烧蚀和损坏。建议将热化学烧蚀和热机械腐蚀作为喷嘴会聚部分的烧蚀机理。因此，为确保喷嘴的安全性和可靠性，对设计进行了修改以适应不同的工作条件。最后，喷嘴的会聚角对固相沉积性能影响很小。在当前冲压工作条件下，喷嘴发散段中的冲击波（发散段中的气体未充分膨胀）和冲压喷射燃烧室的C / C-SiC复合材料都对固相沉积性能产生重大影响。

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  • 来源
  • 会议地点 XIan(CN)
  • 作者

    Riheng Zheng; Zhiyong Li; Jingmin Chen; Lihan Li; Jianmei Li; Litong Zhang; Laifei Cheng; Xiaoying Liu; Chao Chen; Hui Mei;

  • 作者单位

    Science and Technology on Scramjet Laboratory. Beijing Power Machinery Institute, Beijing 100074, P.R.China;

    Science and Technology on Scramjet Laboratory. Beijing Power Machinery Institute, Beijing 100074, P.R.China;

    Science and Technology on Scramjet Laboratory. Beijing Power Machinery Institute, Beijing 100074, P.R.China;

    Science and Technology on Scramjet Laboratory. Beijing Power Machinery Institute, Beijing 100074, P.R.China;

    Science and Technology on Scramjet Laboratory. Beijing Power Machinery Institute, Beijing 100074, P.R.China;

    Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, P.R.China;

    Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, P.R.China;

    Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, P.R.China;

    Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, P.R.China;

    Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, P.R.China;

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