• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>IAF Space Propulsion Symposium;International Astronautical Congress >CHARACTERIZATION OF FILM EVAPORATING MICROCAPILLARIES FOR MICRONEWTON THRUSTERS
【24h】

CHARACTERIZATION OF FILM EVAPORATING MICROCAPILLARIES FOR MICRONEWTON THRUSTERS

机译：微牛顿推力器薄膜蒸发微柱的表征

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Low power micronewton thrusters can provide attitude control for SmallSats to increase mission utility and enable constellation flying. Micronewton thrust control can also enhance missions that require precision pointing such as space telescopes, laser interferometers, and laser communication relays. Film Evaporating MEMS Tunable Arrays (FEMTA) is a novel micropropulsion device that was developed at Purdue University in partnership with NASA Goddard under the SmallSat Partnership program. FEMTA generates thrust by heating micron-scale water capillaries to induce controlled film-boiling in vacuum. Thrust stand tests under high vacuum have shown that FEMTA can produce controllable thrust in the range of 60-100 μN at < 1 W input power with ultra-pure deionized water as propellant. To increase the technology readiness level of FEMTA, improvements in reliability, repeatability, and robustness must be made. Wc present the design, fabrication, and study of a new test-bed FEMTA device that enables direct observation of the microcapillaries. The influence of nozzle dimensions, surface hydrophobicity, propellant temperature, propellant feed pressure, and ambient conditions on microcapillary behavior were studied. Specifically, fluid contact angle, capillary Laplace pressure, and quiescent mass loss rates were characterized for multiple nozzle configurations. Lastly, we use the insights of this study to explore a FEMTA design that mitigates the current reliability issues. Micro-fabrication was performed using standard photolithography processes at Purdue's Nanotechnology Center and vacuum testing was performed at Purdue's High Vacuum Lab.
机译：低功率微纽顿推进器可以为小型卫星提供姿态控制，以提高任务利用率并实现星座飞行。Micronewton推力控制还可以增强需要精确定位的任务，如太空望远镜、激光干涉仪和激光通信继电器。薄膜蒸发MEMS可调谐阵列（FEMTA）是一种新型微脉冲器件，由普渡大学与美国宇航局戈达德（NASA Goddard）在SmallSat合作项目下共同开发。FEMTA通过加热微米级的毛细水柱来产生推力，从而在真空中诱导受控的薄膜沸腾。高真空下的推力台架试验表明，以超纯去离子水为推进剂，FEMTA可以在<1W的输入功率下产生60-100μN的可控推力。为了提高FEMTA的技术准备水平，必须提高可靠性、可重复性和鲁棒性。Wc介绍了一种新的试验台FEMTA装置的设计、制造和研究，该装置能够直接观察微柱。研究了喷嘴尺寸、表面疏水性、推进剂温度、推进剂供给压力和环境条件对微柱行为的影响。具体而言，对多喷嘴配置的流体接触角、毛细管拉普拉斯压力和静态质量损失率进行了表征。最后，我们利用本研究的见解，探索一种缓解当前可靠性问题的FEMTA设计。在普渡大学纳米技术中心使用标准光刻工艺进行微加工，在普渡大学高真空实验室进行真空测试。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号