국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	PROPELLANT FEED SYSTEM LEAK DETECTION뾎ESSONS LEARNED FROM THE LINEAR AEROSPIKE SR-71 EXPERIMENT (LASRE)
저자	Neal Hass, Masashi Mizukami, Bradford A. Neal, Clinton St. John,, Robert J. Beil and Timothy P. Griffin
Keyword	Fire safety; Hypersonic vehicles; Leak assessment; Leak detection; Rocket engines
URL	http://www.dfrc.nasa.gov/DTRS/1999/PDF/H-2378.pdf
보고서번호	NASA-TM-1999-206590
발행년도	1999
출처	NASA Dryden Flight Research Center
ABSTRACT	This paper presents pertinent results and assessment of propellant feed system leak detection as applied to the Linear Aerospike SR-71 Experiment (LASRE) program flown at the NASA Dryden Flight Research Center, Edwards, California. The LASRE was a flight test of an aerospike rocket engine using liquid oxygen and high-pressure gaseous hydrogen as propellants. The flight safety of the crew and the experiment demanded proven technologies and techniques that could detect leaks and assess the integrity of hazardous propellant feed systems. Point source detection and systematic detection were used. Point source detection was adequate for catching gross leakage from components of the propellant feed systems, but insufficient for clearing LASRE to levels of acceptability. Systematic detection, which used high-resolution instrumentation to evaluate the health of the system within a closed volume, provided a better means for assessing leak hazards. Oxygen sensors detected a leak rate of approximately 0.04 cubic inches per second of liquid oxygen. Pressure sensor data revealed speculated cryogenic boiloff through the fittings of the oxygen system, but location of the source(s) was indeterminable. Ultimately, LASRE was canceled because leak detection techniques were unable to verify that oxygen levels could be maintained below flammability limits.