국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	NASA Flexible Screen Propellant Management Device (PMD) Demonstration With Cryogenic Liquid
저자	Wollen, Mark;; Bakke, Victor;; Baker, James
Keyword	CRYOGENIC ROCKET PROPELLANTS;; CRYOGENICS;; ESTIMATING;; FABRICATION;; LIQUEFIED GASES;; LIQUID NITROGEN;; LIQUID OXYGEN;; METHANE;; PROPELLANTS
URL	http://hdl.handle.net/2060/20120008527
보고서번호	NASA/CR-2012-217406
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	While evaluating various options for liquid methane and liquid oxygen propellant management for lunar missions, Innovative Engineering Solutions (IES) conceived the flexible screen device as a potential simple alternative to conventional propellant management devices (PMD). An apparatus was designed and fabricated to test flexible screen devices in liquid nitrogen. After resolution of a number of issues (discussed in detail in the paper), a fine mesh screen 鶅 by 2300 wires per inch) spring return assembly was successfully tested. No significant degradation in the screen bubble point was observed either due to the screen stretching process or due to cyclic fatigue during testing. An estimated 30 to 50 deflection cycles, and approximately 3 to 5 thermal cycles, were performed on the final screen specimen, prior to and between formally recorded testing. These cycles included some "abusive" pressure cycling, where gas or liquid was driven through the screen at rates that produced differential pressures across the screen of several times the bubble point pressure. No obvious performance degradation or other changes were observed over the duration of testing. In summary, it is felt by the author that these simple tests validated the feasibility of the flexible screen PMD concept for use with cryogenic propellants.