Accession Number : ADA310398

Title :   Initial Investigation of a Method Whereby a Cryogenic Propellant Liquid is Insulated From Heat Leak By the Propellant and Its Sacrificial Boiloff.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Olsen, William A.

PDF Url : ADA310398

Report Date : MAY 1966

Pagination or Media Count : 40

Abstract : A small-scale experiment is reported which demonstrated that a few closely spaced thin-film plastic 'bags,' hydraulically connected and mounted close to the propellant tank wall with liquid hydrogen in all volumes, could act as sufficient insulation to cause liquid in the volume nearest the tank wall to boil off sacrificially much of the incoming heat leak. Thus, much of this heat leak is prevented from reaching the liquid shielded by this insulator. As a consequence, the temperature of the liquid in a pressurized tank increases at a much slower rate than it would if there were no bags. This method could result in a weight saving for booster rocket vehicles designed for its application because it can reduce the pump cavitation problem by decreasing the liquid heating rate.

Descriptors :   *LIQUIDS, *CRYOGENIC PROPELLANTS, *BOILOFF, TEMPERATURE, INSULATION, THIN FILMS, HEATING, PRESSURE VESSELS, WALLS, TANKS(CONTAINERS), LIQUID PROPELLANTS, LIQUID HYDROGEN, PUMPS, HEAT, HYDRAULICS, PLASTICS, WEIGHT REDUCTION, LAUNCH VEHICLES, ROCKETS, PROPELLANT TANKS, BAGS, CAVITATION.

Subject Categories : Liquid Rocket Propellants
      Inorganic Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE