Improved pressure-volume-temperature method for estimation of cryogenic liquid volume

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• 作者：Mansu Seo^a ; ^{hipana@kaist.ac.kr} ; Sangkwon Jeong^a ; ¹ ; ^{skjeong@kaist.ac.kr} ; Young-suk Jung^b ; ^{ysjung@kari.re.kr} ; Jakyung Kim^c ; ^{kjkwkrud@kaist.ac.kr} ; Hana Park^c ; ^{blackcat24@kaist.ac.kr}
• 关键词：Pressure&ndash ; volume&ndash ; temperature gauging ; PVT gauging ; Low gravity
• 刊名：Cryogenics
• 出版年：2012
• 期刊代码：45_00112275
• 类别：et
• 出版时间：April-June, 2012
• 卷：52
• 期：4-6
• 页码：290-295
• 文件大小：838 K

摘要

One of the most important issues in a liquid propellant rocket is to measure the amount of remaining liquid propellant under low gravity environment during space mission. This paper presents the results of experiment and analysis of a pressure-volume-temperature (PVT) method which is a gauging method for low gravity environment. The experiment is conducted using 7.4 l tank for liquid nitrogen with various liquid-fill levels. To maximize the accuracy of a PVT method with minimum hardware, the technique of a helium injection with low mass flow rate is applied to maintain stable temperature profile in the ullage volume. The PVT analysis considering both pressurant and cryogen as a binary mixture is suggested. At high liquid-fill levels of 72-80%, the accuracy from the conventional PVT analysis is within 4.6%. At low fill levels of 27-30%, the gauging error is within 3.4%by mixture analysis of a PVT method with specific low mass flow rate of a helium injection. It is concluded that the proper mass flow rate of a helium injection and PVT analyses are crucial to enhance the accuracy of the PVT method with regard to various liquid-fill levels.