高精度流体热物性实验系统及测试  

PRECISE MEASUREMENT SYSTEM FOR THERMOPHYSICAL PROPERTIES OF FLUIDS

作　　者：冯晓娟[1] 许心皓[1] 方锦[1] 林鸿[2] 段远源[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084 [2]热工计量科学与材料特性测量技术研究所,中国计量科学研究院,北京100013

出　　处：《工程热物理学报》2009年第4期565-568,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50636020)

摘　　要：高精度的流体热物性实验研究是新工质工程应用的必要基础,也是获取部分基础物理常量的重要途径(如声速法测量玻尔兹曼常数k、通用气体常数R)。本文建立了高精度的流体热物性实验系统,包括温度测量和恒温系统、压力测量及真空配气系统,实现了实验系统的自动控制与数据采集。可用温度范围-40～180℃,不确定度为±5 mK;压力范围0～10MPa,不确定度为±50 Pa(0～130 kPa),±100 Pa(130～3000 kPa),±0.01%(3～10 MPa)。进行了HFC-227ea的饱和蒸气压验证性实验,结果表明本系统运行稳定,具有较高测量精度。Precise experimental studies on thermophysical properties of fluids are very necessary for their industrial applications, and are also the important ways to acquire some physical constants, such as Boltzmann constant k and universal gas constant R. A new precise apparatus for thermophysical property measurements of fluids has been built, including the temperature measurement, thermostat baths, pressure measurement and vacuum system. Automatic control and data acquisition system have also been set up. The range of the temperature measurement is -40 - 180℃, with the total uncertainty of 4.5 mK. The range of the pressure measurement is 0-10 MPa, with the total uncertainty of 4.50 Pa（0-130 kPa）, ±100 Pa （130 -3000 kPa） and ＋0.01%（3 - 10 MPa）. The vapor pressure of HFC-227ea has been measured to test the stability and precision of the new experimental system.

关 键 词：热物性 恒温槽 温度/压力测量 HFC-227EA 饱和蒸气压 

分 类 号：TH432.1[机械工程—机械制造及自动化]