1. College of Science, Changchun University of Science and Technology, Changchun, Jilin 130022, China
2. National Institute of Metrology, Beijing 100029, China
3. Construction Quality Supervision Station of Navy, Beijing 100161, China
Abstract：Using a cylindrical acoustic resonator, the speed of sound in CO2 at the temperature from 303.10～303.18 K and pressure from 3.855～7.534 MPa is measured. The relative uncertainty of the speed of sound in CO2 is 0.035% at pressure lower than 7.1 MPa and 0.15% at pressure higher than 7.3 MPa. The relative deviation between present data and the calculation from the equation of state is 0.005%～-0.4%. The measurement results can be used to improve the equation of the state of CO2. The experimental system and method can be used in the measurement of CO2 and other working fluids in a wider temperature range in the next future.
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2017, Vol. 38 
