• 作者： 洪儒珍; 徐坤龍
• 作者服務機構： 美國阿拉巴馬大學推進研究中心; 國立台灣海洋大學造船工程系
• 中文摘要： 衛星在太空中，重新起動發動機前，需作推進劑系統之再定位。在再定位時，流體再鎮定所需之逆推動力，再鎮定時間，以及噴泉和搖動波產生可能之消除等，都需作最佳選擇計算。本文介紹超級計算機之計算方式，衛星再定位過程中低溫流體在微重方下之流動機制，以提供衛星最佳設計及最佳運行之方針。
• 英文摘要： The requirement to settle or to position liquid fluid over the outlet end of a spacecraft propellanttank prior to main engine restart poses a microgravity fluid behavior problem. Resettlement or reorienta-tion of liquid propellant can be accomplished by providing optimal acceleration to the spacecraft such thatthe propellant is reoriented over the tank outlet without any vapor entrainment, any excessive geysering,or any other fluid motion undesirable for space fluid management under microgravity environment. Thepurpose of the present study is to investigate the most efficient technique for propellant resettling throughminimization of propellant usage and weight penalties. Numerical simulation starts from a low thrust levelwhich results in incomplete reorientation, complete liquid reorientation without geysering motion, andfinally ends with a large thrust level which activates a geysering motion. In this study, slosh wave excita-tion induced by the resettling flow field activated by 10 Hz high frequency impulsive reverse gravity ac-celeration during the course of liquid filled levels of 30 and 70% have been studied. Characteristics of sloshwaves with various frequencies excited are discussed.
• 中文關鍵字： spacecraft propulsion; microgravity fluid management; slosh waves; liquld reorlentation; propellant resettlement; space-based propulsion system
• 英文關鍵字： --