국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	PREDICTED THERMAL RESPONSE OF A CRYOGENIC FUEL TANK EXPOSED TO SIMULATED AERODYNAMIC HEATING PROFILES WITH DIFFERENT CRYOGENS AND FILL LEVELS
저자	Gregory J. Hanna (Hanna Technology Resources, Boulder, CO) and Craig A. Stephens (PRC Inc., Edwards, CA)
Keyword	Aerodynamic heating; Cryogenics; Fuel tanks; Heat transfer; Liquid hydrogen; Liquid nitrogen; MASP; Numerical analysis; Thermal insulation
URL	http://www.dfrc.nasa.gov/DTRS/1991/PDF/H-1738.pdf
보고서번호	NASA-CR-4395
발행년도	1991
출처	NASA Dryden Flight Research Center
ABSTRACT	A two-dimensional finite-difference thermal model was developed for the Generic Research Cryogenic Tank (GRCT). The model was used to predict the effects of heating profile, fill level, and cryogen type prior to experimental testing. These numerical predictions will assist in defining test scenarios, sensor locations, and venting requirements for the GRCT experimental tests. Boiloff rates, tank-wall and fluid temperatures, and wall heat fluxes were determined for 20 computational test cases. The test cases spanned three discrete fill levels and three heating profiles for hydrogen and nitrogen. Large temperature gradients developed in the vapor region of the tank when the vapor was allowed to stratify, but vapor mixing greatly reduced the top-to-bottom temperature gradient. The thermal response of the GRCT was qualitatively similar to anticipated transatmospheric vehicle (TAV) behavior. Nitrogen simulations deviated from hydrogen simulations in several key areas, particularly where the vapor heat capacity contributed to the system thermal response. The internal radiation and wall-to-vapor heat transfer effects were small compared with the effect of vapor mixing.