Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-05-24 Cooperative journals: 《工程热物理学报》
Abstract:相变发汗冷却对于高超声速飞行器关键高温部位热防护具有重要的意义。本文实验研究了温度为700 K主流条件下烧结青铜多孔介质平板以液态水为冷却流体的相变发汗冷却过程及效果。实验研究结果表明,水相变发汗冷却效率较高。在一定的冷却剂注入率范围内,由于蒸气堵塞效应,多孔平板表面沿着主流方向存在着界面明显的相对高温区和充分冷却区,并且两个区域的界面难以稳定,呈周期振荡。适当减小烧结多孔平板颗粒直径有利于增强相变发汗冷却效率。
Subjects: Astronomy >> Astrophysical processes submitted time 2020-05-06 Cooperative journals: 《天文研究与技术》
Abstract: 帕克太阳探测器(Parker Solar Probe,简称PSP)是以现代太阳风和磁重联理论的奠基人——尤金•纽曼•帕克(Eugene Newman Parker) 命名的航天器,将穿过太阳的日冕层,探索航天器从未探测过的区域,对日冕和太阳风的起源和动力学特征进行直接探测,有望破解日冕高温之谜和太阳风速度奇高这两大谜团,其热防护系统遇到的困难和挑战远超目前所有航天器。本文首先介绍了探测太阳的意义和PSP的科学目标,然后简述了PSP轨道和轨道热环境并指出了热防护的难点。分析了PSP热防护系统的结构,然后详细阐述了热防护系统的热盾及迎日涂层、太阳能电池板及冷却系统设计,最后给出了PSP热防护系统对我国抵近太阳探测器热防护系统设计方面的启示。
Subjects: Astronomy >> Astrophysical processes submitted time 2020-05-06 Cooperative journals: 《天文研究与技术》
Abstract: 中国科学院云南天文台首次提出了太阳爆发过程及相应磁场结构抵近探测的科学项目,该项目将对太阳大气及其发生在其中的剧烈活动进行前所未有的近距离测量。项目研制的探测器近日区域运行的时间将超过帕克太阳探测器(Parker Solar Probe,简称PSP)和Solar Orbiter太阳探测器,其热防护系统遇到的困难也远超后两者。本文首先分析了抵近探测器的轨道环境特点,提出了热防护的设计思路,然后给出了具体热防护系统设计、仿真和地面实验方案。初步研究显示,热防护系统的设计方案具有辐射散热好、耐高温、稳定可靠性高等优点。
Subjects: Engineering and technical science >> Other Disciplines of Engineering and technical science submitted time 2024-06-28 Cooperative journals: 《中国科学院院刊》
Abstract: Hypersonic technology is a key technology in the aerospace field in the future and is of very important strategic and forward-looking significance. Using bibliometric methods, it is found that research on hypersonic technology is mainly concentrated in the military field, among which power propulsion technology, navigation guidance and control technology, thermal protection technology and new materials are important research directions in this field. After sorting out the research and development situation of various countries, it is found that the relevant core technologies related to the development of hypersonic weapons are still the focus of future research. At the same time, accelerating the deployment of hypersonic defense systems and strengthening cooperation with partner countries in technology research and development, joint air defense and missile defense to enhance regional defense and deterrence are also priorities for future deployment of countries.