Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..985.1491h&link_type=abstract
ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP Conference Proceedin
Other
Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Analytical And Numerical Techniques, Data Analysis: Algorithms And Implementation, Data Management, Testing In Microgravity Environments
Scientific paper
Cryogens are viable candidate propellants for NASA's Lunar and Mars exploration programs. To provide adequate mass flow to the system's engines and/or prevent feed system cavitation, gaseous helium (GHe) is frequently considered as a pressurant. A Thermodynamic Venting System (TVS) is designed to maintain tank pressure during low gravity operations without propellant resettling. Tests were conducted in the Marshall Space Flight Center (MSFC) Multi-purpose Hydrogen Test Bed (MHTB) to evaluate the effects of GHe pressurant on pressure control performance of a TVS with liquid hydrogen (LH2) and nitrogen (LN2) test liquids. The TVS used comprises a recirculation pump, a Joule-Thomson (J-T) expansion valve, and a parallel flow concentric tube heat exchanger combined with a longitudinal spray bar. A small amount of liquid extracted from the tank recirculation line was passed through the J-T valve and then through the heat exchanger, extracting thermal energy from the bulk liquid and ullage and thereby enabling pressure control. The LH2/GHe tests were performed at fill levels of 90%, 50%, and 25%, and LN2/GHe tests were conducted at fill levels of 50% and 25%. Moreover, each test was conducted with a specified tank ullage pressure control band. A one-dimensional TVS performance program was used to analyze and correlate the test data. Predictions were compared with test data of ullage pressure and temperature and bulk liquid saturation pressure and temperature.
Flachbart R. H.
Hastings Leon J.
Hedayat A.
Nelson S. L.
Tucker Stephen P.
No associations
LandOfFree
Analyzing the Use of Gaseous Helium as a Pressurant with Cryogenic Propellants with Thermodynamic Venting System Modelling and Test Data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Analyzing the Use of Gaseous Helium as a Pressurant with Cryogenic Propellants with Thermodynamic Venting System Modelling and Test Data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analyzing the Use of Gaseous Helium as a Pressurant with Cryogenic Propellants with Thermodynamic Venting System Modelling and Test Data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1036382