Comparison of Liquid Hydrogen no-Vent Fill Test Data with Analytic Models
The no-vent fill process has been identified as the most promising technique for filling cryogenic tanks in space. In-space testing of this process is extremely expensive, so less expensive ground tests have been performed to learn more about the process before a space-based test program is initiated. NASA Lewis Research Center (LeRC) has performed a series of liquid hydrogen no-vent fill tests at the K-Site facility over the past several years. These tests have proven that liquid hydrogen no-vent fills can be successfully performed in a one-g environment. The data has also provided some one-g validation of analytic models.
This paper presents actual data from the Phase IIA liquid hydrogen no-vent fill tests performed at K-Site. These tests involved pressurized transfers from a 4.96 m3 (175 ft3) supply tank to a 2.01 m3 (71 ft3) receiver tank, both located inside a 7.62 m (25 ft) diameter vacuum chamber. The tests included both spray bar and bottom jet no-vent fills of the receiver tank. However, only the spray bar tests are considered in this paper. The near flight weight receiver tank has a thermal mass-to-volume ratio of 54.5 kg/m3 (3.4 lbm/ft3). Predictions from two analytic computer models (GDNVF and NVEQU) are presented. These models show good agreement with the pressure profile test data.
KeywordsVapor Bubble Liquid Hydrogen Test Tank Tank Wall Fill Level
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