摘要
短周期任务的航天器,在任务结束后要放掉工质,以减轻重量,提高安全性和可靠性。基于两相混合流动及液体闪蒸、闪蒸波理论,结合压力突降过程液态全氟三乙胺闪蒸试验,对1/6 g重力、高真空环境排放流体回路管道内液态全氟三乙胺工质的过程进行分析。结果表明,全氟三乙胺工质向真空排放时会发生闪蒸,回路系统内液体工质的排放时间主要取决于压力排放段、重力辅助排放段和闪蒸波传播段;其中,仅重力辅助排放段依赖于重力,闪蒸波传播段时间最长;试验观测闪蒸波在内径9 mm塑料管内的传播速度为0.23 m/s,比Simes-Moreira&Shepherd简化模型预测结果偏大。
For lightening or improving reliability and security,more and more space aircrafts with short periodic mis-sions need to evacuate the working fluid after the mission ending. Based on the two phase flow and the liquid flashing vapori-zation theory,together with the N(C2 F5 )3 flashing vaporization experiment carrying out in the pressure rapidly decreased sur-rounding,it was analyzed in the present study that the working fluid N(C2 F5 )3 in the fluid loop evacuating in high vacuum under 1/6g gravity and condition. The results indicated that the N(C2 F5 )3 evacuating in the high vacuum would tempestu-ously flash vaporization. The time of working fluid evacuating was decided by the Pressure Evacuating Stage,the Gravity As-sisted Evacuating Stage and the Flashing Vaporization Wave Transmitting Stage,and only the second stage depended on the gravity,the last stage time is the longest. The velocity 0. 23m/s of the flashing vaporization wave transmitting was experimen-tally measured in the plastic pipe with 9mm in diameter. It was faster than the prediction by Sim?es-Moreira & Shepherd simplified model.
出处
《真空与低温》
2015年第3期139-145,共7页
Vacuum and Cryogenics
关键词
工质排放
闪蒸
真空
working fluid evacuating
flashing vaporization
vacuum
作者简介
徐侃（1983-）,男,湖南省人,工程师,从事空间飞行器热控的研究.E-mail：ridxk＠163.com.
