Helium Storage at High Density and Discharge at High Flow Rates
The Air Force Weapons Laboratory requires bulk storage and discharge of cryogenic helium at densities approaching 0.2 × 103 kg/m3 (12.5 lb/ft3) and pulsed flow rates of several kg/s—conditions significantly in excess of previous applications. By comparison, the Apollo Lunar Module Helium Storage System has a fill density of 0.13 × 103 kg/m3 (8.1 lb/ft3) and a discharge rate of 0.04 kg/sec (0.09 lb/sec) . In order to demonstrate the practical feasibility of a system meeting these requirements, the NBS Cryogenics Division was asked to design, build, and demonstrate a system to: (1) store helium in a dewar at a density approaching 0.2 × 103kg/m3 with a pressure less than 10.3 MPa; (2) discharge helium in pulses of 2 sec or more and at a flow rate of at least 1.0 kg/sec at greater than 3.5 MPa pressure.
KeywordsConvection Helium Stratification Compressibility Boulder
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