高温高压下气体声学性质的实验研究

高温、高压下气体的声学性质对于特殊条件下混合气体的识别，以及石油化工、石油测井、汽缸检测、天然气行业以及工程热物理学等有着重要作用。为此，在实验室内对N₂、CO₂、CH₄等气体在高温（20 ~120 ℃）、高压（0~40 MPa）条件下进行了声学性质测量，得到了各种气体在不同温度、压力下声波波速的计算关系式，同时得到了各气体比热容比值随温度的变化规律。通过研究得出结论：通过不同温度、压力下的声波波速计算关系式，可以对温度在0 ~120 ℃之间、压力为0~40 MPa条件下的任意温度、压力状态的声波波速进行估算，计算得到的气体比热容比值可以满足工程要求。

STUDY ON GASEOUS SONIC PROPERTY UNDER HIGH TEMPERATURE AND HIGH PRESSURE

Gaseous sonic property under high temperature and high pressure is very important for identification of mixed gas under special conditions, and for petrochemicals, well logging, cylinder detection, gas industry and engineering thermo physics etc. Therefore, the sonic property measuring is conducted in laboratory under high temperature (20~120  ℃) and high pressure (0~40 MPa) for the gases of N2、CO2 and CH4 etc. The relational expression of sonic velocity calculation for different gases under different temperature and pressure is obtained. Also, the law of specific heat capacity changing with temperature is managed for different gases. The study results show with the relational expression of sonic velocity calculation under different temperature and pressure, the sonic velocity can be estimated for any temperature and pressure under the conditions of temperature from 20 to 120 ℃ and pressure from 0 to 40 MPa. The ratio of heat capacity calculated is so precise that it can meet engineering requirements.