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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(0～40MPa)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0～40MPa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。
The acoustic properties of gases under high temperature and pressure have an important role in the identification of mixed gases under special conditions and in the petrochemical industry, petroleum logging, cylinder testing, natural gas industry and engineering thermophysics. Therefore, the acoustic properties of N2, CO2, CH4 and other gases under high temperature (20 ~ 120 ℃) and high pressure (0 ~ 40MPa) were measured in the laboratory. The acoustic properties of various gases under different temperatures and pressures The relationship between the calculation of wave velocity and the ratio of specific heat capacity of each gas with temperature was obtained. The conclusions drawn from the study are as follows: Through calculating the relationship between the wave velocity under different temperature and pressure, the wave velocity at any temperature and pressure under the condition of 0 ~ 120 ℃ and 0 ~ 40MPa can be estimated and calculated The ratio of the specific heat capacity of the gas can meet the engineering requirements.