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기술보고서 게시판 내용
타이틀	Cryogenic Propellant Management Device: Conceptual Design Study
저자	Wollen, Mark;; Merino, Fred;; Schuster, John;; Newton, Christopher
Keyword	ALUMINUM;; CRYOGENICS;; FLUID MANAGEMENT;; HIGH PRESSURE;; LAUNCHING;; LIQUEFIED GASES;; LIQUID OXYGEN;; LUNAR LANDING;; LUNAR LAUNCH;; METHANE;; PROPELLANT TANKS;; REACTION CONTROL;; STORABLE PROPELLANTS
URL	http://hdl.handle.net/2060/20110000503
보고서번호	NASA/CR-2010-216777
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Concepts of Propellant Management Devices (PMDs) were designed for lunar descent stage reaction control system (RCS) and lunar ascent stage (main and RCS propulsion) missions using liquid oxygen (LO2) and liquid methane (LCH4). Study ground rules set a maximum of 19 days from launch to lunar touchdown, and an additional 210 days on the lunar surface before liftoff. Two PMDs were conceptually designed for each of the descent stage RCS propellant tanks, and two designs for each of the ascent stage main propellant tanks. One of the two PMD types is a traditional partial four-screen channel device. The other type is a novel, expanding volume device which uses a stretched, flexing screen. It was found that several unique design features simplified the PMD designs. These features are Ƒ) high propellant tank operating pressures, ƒ) aluminum tanks for propellant storage, and Ɠ) stringent insulation requirements. Consequently, it was possible to treat LO2 and LCH4 as if they were equivalent to Earth-storable propellants because they would remain substantially subcooled during the lunar mission. In fact, prelaunch procedures are simplified with cryogens, because any trapped vapor will condense once the propellant tanks are pressurized in space.