• 作者： 洪儒珍; 徐坤龍
• 作者服務機構： 美國阿拉巴買大學機械與航太工程學系; 國立台灣海洋大學造船工程學系
• 中文摘要： 在微重力環境下，衛星推進系統中之液體儲箱，即便尚有多量液體，在液體由儲箱底部流出時，亦會產生氣體吸引現象。產生氣體吸引時，在儲箱中所存之液體量稱為液體剩餘。本文討論在不同重力環境下，不同液體流量所構成之液體剩餘之關聯。在太空中之氣體吸引要儘量避免。本文以計算機模擬方式，求出隨時間變化之流體動態。文中討論氣體吸引產生瞬間，如儲箱之液體流出加以切斷時，所激起之搖動波。此現象密切關係到衛星之控制問題
• 英文摘要： The dynamical behavior of vapor ingestion, liquid residual at the incipience of suction dip, liquidhydrogen shut-off at the incipience of suction dip, and slosh wave excitation under normal and variousreduced gravity environments and different flow rates of liquid during draining have been investigated.The results show that the liquid residual at the incipience of suction dip increases as the values of gravityenvironment decrease from normal gravity to lower reduced gravity, and also that the liquid residualincreases as the flow rate of liquid increase during the course of liquid hydrogen draining. In slosh waveexcitation, results show that slosh waves are unable to excite for flow fields with lower ratios of Bondnumber and Weber number. Results indicate that flow fields with lower flow rates of liquid draining andhigher restoring force fields of gravity are responsible for the excitation of lower frequencies (higher waveperiods) and higher wave amplitude slosh waves. For liquid hydrogen shut-off at the moment of theincipience of suction dip, a waterhammer type of large amplitude surge is observed. Results also show thatslosh waves accompanied by a strong geyser are developed for surge-related flow fields at the moment ofliquid hydrogen shut-off. Slosh wave excitation, during liquid hydrogen shut-off, shifts the fluid massdistribution in the container, which imposes time-dependent variation in spacecraft moment of inertiaThis provides important information for spacecraft guidance and attitude control.
• 中文關鍵字： suction dip; liquid residual during draining; microgravity; liquid propellant; space propulsion system; liquid hydrogen
• 英文關鍵字： --