采用低温流体氘和氧的介电常数测量流体的密度  

DENSITY MEASUREMENT OF CRYOGENIC FLUIDS D_2 AND O_2 BY DIELECTRIC CONSTANT METHOD

作　　者：周绍华[1] 黄永华[1] 叶君建[2] 高旭 陈虹 ZHOU Shao-hua;HUANG Yong-hua;YE Jun-jian;GAO Xu;CHEN Hong(Shanghai Cryogenic Technology and Testing Application Service Platform,Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Institute of Laser Plasma Research,Shanghai 201800,China;State Key Laboratory of Aerospace Cryogenic Propellant,Beijing 100028,China)

机构地区：[1]上海交通大学制冷与低温工程研究所上海市低温技术与测试应用服务平台,上海200240 [2]上海激光等离子体研究所,上海201800 [3]航天低温推进剂国家重点实验室,北京100028

出　　处：《真空与低温》2018年第3期176-181,共6页Vacuum and Cryogenics

基　　金：航天低温推进剂技术国家重点实验室开放课题(SKLTSCP-1716-W);上海市研发平台专项(16DZ2291500);国家自然科学基金(51676118)

摘　　要：为测量低温流体在不同受控状态下的密度,设计了一套基于G-M低温制冷机的介电常数法低温流体密度测量实验装置,该实验装置适用温度测量范围为15~300 K,压力测量范围0.01~0.30 MPa。实验中的低温液体由常温气态流体经低温制冷机冷却液化得到,蓄流在装有平行板电容器的样品流体测试腔内。该测试腔上开有视窗,可用于观察冷却过程中低温液体的形成及其液位情况。对受控压力及温度下的液氘、液氧的密度进行了测量,所得数据与文献实验值及美国NIST标准数据吻合良好,液相区相对偏差小于±0.5%,满足高精度p-ρ-T热物性参数的需要。In order to measure the density of cryogenic fluids in different states,an experimental setup for densitymeasurement of cryogenic fluids by dielectric constant method has been designed and fabricated to measure the ensity ofdeuterium and oxygen,with a two-stage G-M cryocooler as the cold source. The system is applicable for the temperaturerange of 15-300 K,and pressure range of 0.01-0.3 MPa. The experimental liquid is obtained through liquefaction of thegas by the cryocooler and then stored in the sample fluid test cell,in which the parallel plate capacitor is positioned. Thetest cell is embedded with an optical window,which can be used to observe the formation of liquid and its level during thecooling process. The densities of liquid deuterium and liquid oxygen under controlled pressure and temperature have beenmeasured. The liquid phase measurement agree with the experimental data in literature and the NIST reference data within± 0.5%,which meets the accuracy requirement of high quality p-ρ-Tproperty measurement.

关 键 词：低温流体 液化 电容 密度测量 

分 类 号：TB661[一般工业技术—制冷工程]