Abstract
Martin Marietta Space Systems had fabricated a representative long-term, cryogenic storage system and is presently conducting an experimental program to investigate system operational problems and concerns. The tank system includes a typical thermodynamic vent subsystem (TVS) composed of a Joule-Thompson throttling flow control device, an internal heat exchanger, a vapor-cooled shield (VCS), and multilayer insulation. The purpose of the test program is to generate performance data for development and verification of analytical models. Testing is being conducted in a vacuum chamber using both liquid nitrogen and liquid hydrogen. Data accumulated include the system parasitic heat leak, tank pressure rise rate resulting from heat leak, TVS flow rate, and temperatures throughout the system. Correlation of these data with analytical model predictions is in progress.
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