| タイトル | Testing of a Spray-bar Thermodynamic Vent System in Liquid Nitrogen |
| 著者（英） | Tucker, S. P.; Hastings, L. J.; Flachbart, R. H.; Hedayat, A.; Nelson, S. L. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 2005-01-01 |
| 言語 | eng |
| 内容記述 | To support development of a microgravity pressure control capability for liquid oxygen, thermodynamic vent system (TVS) testing was conducted at Marshall Space Flight Center (MSFC) using liquid nitrogen (LN2) as a LOX simulant. The spray bar TVS hardware used was originally designed by the Boeing Company for testing in liquid hydrogen (LH2). With this concept, a small portion of the tank fluid is passed through a Joule-Thomson (J-T) device, and then through a longitudinal spray bar mixed-heat exchanger in order to cool the bulk fluid. To accommodate the larger mass flow rates associated with LN2, the TVS hardware was modified by replacing the recirculation pump with an LN2 compatible pump and replacing the J-T valve. The primary advantage of the spray-bar configuration is that tank pressure control can be achieved independent of liquid and vapor location, enhancing the applicability of ground test data to microgravity conditions. Performance testing revealed that the spray-bar TVS was effective in controlling tank pressure within a 6.89 kPa band for fill levels of 90%, 50%, and 25%. Tests were also conducted with gaseous helium (GHe) in the ullage. The TVS operated nominally with GHe in the ullage, with performance similar to the tests with gaseous nitrogen (GN2). Testing demonstrated that the spray-bar TVS design was flexible enough for use in two different propellants with minimal hardware modifications. |
| NASA分類 | Fluid Mechanics and Thermodynamics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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