Accession Number : ADA306050

Title :   Cryogenic Positive Expulsion Bladders.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Lark, Raymond F.

PDF Url : ADA306050

Report Date : APR 1968

Pagination or Media Count : 18

Abstract : As more complex space missions are planned, new requirements become essential for space vehicle design. One of the areas of major interest is the study and development of methods for transfer or ejection of cryogenic propellants under a zero gravity environment to a point of usage. An essentially zero gravity environment is produced on a vehicle and its component parts during certain portions of its space flight. The relative positions that a fluid and its vapor will occupy in its storage tank during zero gravity have been extensively investigated. Propellant tanks can be designed to exploit the known properties of surface tension forces and to orient the fluid and its vapor over the appropriate discharge ports by use of surface tension stand pipes and screens. However, adverse accelerations, such as lateral movements caused by the vehicle attitude control system, may cause the discharge port to be uncovered. The purpose of this report is to summarize Lewis Research Center's in-house and contractual testing data for two promising polymeric expulsion bladder barrier films (Mylar and Kapton) and two substrate materials (polyethylene film and Nomex-Nylon paper). (KAR) p. 2-3

Descriptors :   *SPACECRAFT COMPONENTS, *CRYOGENIC STORAGE DEVICES, *EXPULSION BLADDERS, REQUIREMENTS, SPACECRAFT, ATTITUDE CONTROL SYSTEMS, ENVIRONMENTS, VAPORS, ACCELERATION, FILMS, SUBSTRATES, POLYMERIC FILMS, ADVERSE CONDITIONS, EJECTION, VEHICLES, WEIGHTLESSNESS, STORAGE TANKS, SPACE FLIGHT, CRYOGENICS, SPACE MISSIONS, PROPELLANT TANKS, POLYETHYLENE, CRYOGENIC PROPELLANTS, POLYIMIDE RESINS, POSITIVE EXPULSION, POLYETHYLENE TEREPHTHALATE.

Subject Categories : Thermodynamics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE