Other
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1218.1385j&link_type=abstract
TRANSACTIONS OF THE CRYOGENIC ENGINEERING CONFERENCE-CEC: Advances in Cryogenic Engineering. AIP Conference Proceedings, Volume
Other
Joule-Thomson Effect, Cryogenics, Propulsion, Flow Measurement, Thermodynamic Properties, Equations Of State, Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Magnetic Levitation, Propulsion And Control Devices, Velocity Measurements
Scientific paper
Joule-Thomson (J-T) devices have been identified as critical components for future space exploration missions. The NASA Constellation Program lunar architecture considers LOX/LH2 propulsion for the lunar lander descent stage main engine an enabling technology, ensuring the cryogenic propellants are available at the correct conditions for engine operation. This cryogenic storage system may utilize a Thermodynamic Vent System (TVS) that includes J-T devices to maintain tank fluid pressure and temperature. Previous experimental investigations have indicated that J-T devices may become clogged when flowing LH2 while operating at a temperature range from 20.5 K to 24.4 K.
It has been proposed that clogging is due to a trace amount of metastable, supercooled liquid neon in the regular LH2 supply. In time, flow blockage occurs from accretion of solid neon on the orifice.
This clogging poses a realistic threat to spacecraft propulsion systems utilizing J-T devices in cryogenic pressure control systems. TVS failure due to J-T clogging would prevent removal of environmental heat from the propellant and potential loss of mission.
This report describes J-T clogging tests performed with LH2. Tests were performed in the expected Lunar Lander operating regime, and several methods were evaluated to determine the optimum approach to mitigating the potential risk of J-T clogging.
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