Thermodynamic vent system performance testing with subcooled liquid methane and gaseous helium pressurant

被引：20

作者：

Flachbart, R. H. ^{[1
]}

Hastings, L. J. ^{[2
]}

Hedayat, A. ^{[1
]}

Nelson, S. L. ^{[1
]}

Tucker, S. P. ^{[1
]}

机构：

[1] NASA, Marshall Space Flight Ctr, Engn Directorate, Huntsville, AL 35812 USA

[2] Alpha Technol Inc, Huntsville, AL 35812 USA

来源：

CRYOGENICS | 2008年 / 48卷 / 5-6期

关键词：

cryogenic test; thermodynamic; vent; methane; helium;

D O I：

10.1016/j.cryogenics.2008.03.011

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

LCH4 testing was conducted at the Marshall Space Flight Center using the multipurpose hydrogen test bed (MHTB) to evaluate the performance of a spray-bar thermodynamic vent system (TVS) with sub-cooled LCH4 and gaseous helium (GHe) pressurant. Thirteen days of testing were performed in November 2006, with total tank heat leak conditions of about 715 W and 420 W at a fill level of approximately 90%. A total of 23 TVS cycles were completed. The TVS successfully controlled the ullage pressure within a prescribed control band but did not maintain a stable liquid saturation pressure. This was likely due to a TVS design not optimized for this particular propellant and test conditions, and possibly due to a large artificially induced heat input directly into the liquid. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：217 / 222

页数：6