Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1507372 | Cryogenics | 2014 | 12 Pages |
Abstract
This paper presents experimental design and test results of the recently concluded 1-g inverted vertical outflow testing of two 325Â ÃÂ 2300 full scale liquid acquisition device (LAD) channels in liquid hydrogen (LH2). One of the channels had a perforated plate and internal cooling from a thermodynamic vent system (TVS) to enhance performance. The LADs were mounted in a tank to simulate 1-g outflow over a wide range of LH2 temperatures (20.3-24.2Â K), pressures (100-350Â kPa), and flow rates (0.010-0.055Â kg/s). Results indicate that the breakdown point is dominated by liquid temperature, with a second order dependence on mass flow rate through the LAD. The best performance is always achieved in the coldest liquid states for both channels, consistent with bubble point theory. Higher flow rates cause the standard channel to break down relatively earlier than the TVS cooled channel. Both the internal TVS heat exchanger and subcooling the liquid in the propellant tank are shown to significantly improve LAD performance.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
J.W. Hartwig, D.J. Chato, J.B. McQuillen, J. Vera, M.T. Kudlac, F.D. Quinn,