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为了研究超临界CO2流体中超声声速特性,设计了可用于超临界CO2流体的声速测量装置,采用频率2.5MHz单探头的脉冲回波法测量了温度为25~55℃,压力为10~26MPa的CO2流体声速。结果表明:超临界CO2流体声速随压力的增加而增大,随温度的升高而降低,超临界CO2流体声速是压力和温度的函数。
In order to study the ultrasonic velocity characteristics in supercritical CO2 fluid, a sound velocity measurement device that can be used for supercritical CO2 fluid was designed. The pulse echo method was used to measure the temperature of 25 ~ 55 ℃ and the pressure of 10 ~ 26MPa CO2 fluid sound velocity. The results show that the velocity of sound of supercritical CO2 fluid increases with the increase of pressure and decreases with the rise of temperature. The velocity of sound of supercritical CO2 fluid is a function of pressure and temperature.