This paper presents experimental results for the liquid hydrogen bubble point tests using warm pressurant gases conducted at the Cryogenic Components Cell 7 facility at the NASA Glenn Research Center in Cleveland, Ohio. The purpose of the test series was to determine the effect of elevating the temperature of the pressurant gas on the performance of a liquid acquisition device. Three fine mesh screen samples (325×2300, 450×2750, 510×3600) were tested in liquid hydrogen using cold and warm noncondensible (gaseous helium) and condensable (gaseous hydrogen) pressurization schemes. Gases were conditioned from 0K - 90K above the liquid temperature. Results clearly indicate a degradation in bubble point pressure using warm gas, with a greater reduction in performance using condensable over noncondensible pressurization. Degradation in the bubble point pressure is inversely proportional to screen porosity, as the coarsest mesh demonstrated the highest degradation. Results here have implication on both pressurization and LAD system design for all future cryogenic propulsion systems. A detailed review of historical heated gas tests is also presented for comparison to current results.
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机译:本文介绍了在俄亥俄州克利夫兰NASA Glenn Research Center在NASA Glenn Research Center的低温组分Cell 7设施中进行的温加压力进行液体氢气泡点测试的实验结果。试验系列的目的是确定升高加压气体温度对液体采集装置的性能的影响。使用冷热不可冷凝(气态氦)和可凝聚(气态氢)加压方案,在液体氢气中测试三种细网筛样品(325×2300,450×2750,510×3600)。气体在液体温度以上0k-90k调节。结果清楚地表明使用温气的气泡点压力降解,使用可粘附的不可缩压的加压,性能更大。由于最粗糙的网格证明了最高降解,气泡点压力的降解与筛孔孔隙率成反比。这里的结果对所有未来的低温推进系统的加压和LAD系统设计都有所意义。还提出了对历史加热气体测试的详细审查,以与当前结果进行比较。
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