近临界CO2中超声波传播特性研究

采用由声速测量探头与CTS-3600数字式超声探伤仪组成的声速测量装置,对超声波在近临界CO2中传播特性进行了研究。研究结果表明,无论在近临界CO2还是在夹带剂-近临界CO2体系中,超声波的声速和相对声强都是体系（近临界CO2或夹带剂-近临界CO2）密度的函数,随着压力的增大而升高,随着温度的升高而下降。与近临界CO2体系相比,夹带剂-近临界CO2体系中的超声波的声速和声强值要略高,其主要原因可能是夹带剂乙醇的加入增大了体系的密度。

Study of ultrasonic propagation characteristic in near-critical CO2

By using a sound speed measurement device composed of probe and CTS-3600 digital ultrasonic velocity measurement, ultrasonic propagation characteristic in near-critical CO2 has been studied. Research results show that both ultrasonic speed and relative sound intensity are the function of system density in either near-critical CO2 system or near-critical CO2 with entrainer system. With pressure increasing, both of them increase. At the same time, with temperature increasing, both of them decrease. Ultrasonic velocity and relative sound intensity in the near-critical CO2 with entrainer system are higher than those in near-critical CO2 system, the main reason might be that addition of entrainer alcoholic increases system density.