超临界二氧化碳物性参数测量方法综述

对于超临界二氧化碳(S-CO2)物性参数的获取,一般可从美国国家标准与技术研究院(NIST)直接查询,但S-CO2在临界点处物性发生剧烈变化.在实际工业应用中,S-CO2的密度、粘度和热导率这3个方面对与超临界二氧化碳布雷顿循环的研究有着很重要的作用,为了解目前S-CO2物性的测量方法,该文对当前所涉及到的S-CO2基...

Review of measurement methods for physical parameters of supercritical carbon dioxide

The physical properties of supercritical carbon dioxide(S-CO₂)change drastically at the critical point.The acquisition of physical properties of S-CO₂can generally be directly inquired from the National Institute of Standards and Technology.In practical industrial applications,the three aspects of S-CO₂density,viscosity and thermal conductivity play an important role in the research of supercritical carbon dioxide Brayton cycle.In order to understand the current measurement methods of S-CO₂physical properties,this article presents the basic physical properties measurement methods of S-CO₂involved,introducing variable volume method,single/double sinking densitometer and vibrating tube method to measure density;falling ball method,particle-velocity method,rotating cylinder body method,oscillating-disk viscometer and vibratingwire viscometer;parallel plate method,concentric cylinder and hot wire transient method to measure thermal conductivity.After finishing the physical property measurement methods,it was found that the vibrating cantilevers method can be used to measure the density of S-CO₂,the vibrating-wire method can be used to measure the viscosity of S-CO₂and the parallel plate method to measure the thermal conductivity of S-CO₂.