Liquid droplet radiator program at the NASA Lewis Research Center
Liquid droplet radiator program at the NASA Lewis Research Center
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美国宇航局刘易斯研究中心的液滴散热器项目
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
K. White
中科院分区：
文献类型：
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作者：
A. Presler;C. Coles;P. S. Diem;K. White
美国国家航空航天局刘易斯研究中心和空军火箭推进实验室（AFRPL）联合参与了一项计划，对液滴散热器（LDR）概念进行技术评估，作为未来太空任务的先进高性能热弹射部件。NASA刘易斯负责液滴发生器所需的技术，工作流体的鉴定，以及研究太空中液滴的物理特性；NASA刘易斯也在为候选空间动力系统的潜在LDR应用进行系统/任务分析。对于液滴发生器技术任务，实验研究了微孔制造技术和液滴流形成过程。高质量的微孔（直径50微米）通常用自动化设备制造。液滴形成研究已经为控制和均匀液滴流的产生建立了操作边界。目前正在安装一个试验台，用于在模拟空间条件下实验验证液滴辐射传热性能分析和确定多个液滴流的影响辐射发射率。为了研究微重力条件下液滴流的行为，NASA刘易斯零重力设施已经开始了初步测试。这包括孔板润湿对射流动力学和液滴形成的影响。布雷顿和斯特林功率循环的结果表明，与传统散热器概念相比，LDR具有良好的质量和尺寸比较。
The NASA Lewis Research Center and the Air Force Rocket Propulsion Laboratory (AFRPL) are jointly engaged in a program for technical assessment of the Liquid Droplet Radiator (LDR) concept as an advanced high performance heat ejection component for future space missions. NASA Lewis has responsibility for the technology needed for the droplet generator, for working fluid qualification, and for investigating the physics of droplets in space; NASA Lewis is also conducting systems/mission analyses for potential LDR applications with candidate space power systems. For the droplet generator technology task, both micro-orifice fabrication techniques and droplet stream formation processes have been experimentally investigated. High quality micro-orifices (to 50 micron diameter) are routinely fabricated with automated equipment. Droplet formation studies have established operating boundaries for the generation of controlled and uniform droplet streams. A test rig is currently being installed for the experimental verification, under simulated space conditions, of droplet radiation heat transfer performance analyses and the determination of the effect radiative emissivity of multiple droplet streams. Initial testing has begun in the NASA Lewis Zero-Gravity Facility for investigating droplet stream behavior in microgravity conditions. This includes the effect of orifice wetting on jet dynamics and droplet formation. Results for both Brayton and Stirling power cycles have identified favorable mass and size comparisons of the LDR with conventional radiator concepts.