In order to explore the type of underground cavern with compressed air energy storage from the perspective of thermodynamics

a numerical model of the first inflation and pressurization process of the cavern considering turbulence

heat transfer and real air characteristics is established

by using the computational fluid dynamics(CFD) method. The effects of different length-diameter ratios and inlet diameters of inflatable pipes on temperature rise of gas and lining materials in the cavern and the temperature distribution in the cavern are studied

and the control measures are put forward for the local high temperature phenomenon in the cavern. The main conclusions are as follows. When the length-diameter ratio is small(large tank gas storage)

the temperature distribution in the cavern is relatively uniform. With the increase of the ratio of length to diameter(tunnel-type gas storage)

the temperature distribution in the cavern appears stratification phenomenon

and the extremely high temperature zone appears at the end of the cavern(stuffy top effect). The temperature rise of the steel plate sealing layer is the largest in the process of inflation and pressurization of the cavern

the temperature change of the concrete lining is small

and the surrounding rock is almost not affected by temperature change in the cavern.Reducing the inlet diameter of the inflatable pipe can reduce the temperature in the cavern to a certain extent and promote the outward heat transfer. For the annular tunnel type cavern

the proposed improved inflation method can make the temperature distribution in the cavern uniform

avoid the stuffy roof effect

and provide a useful reference for engineering design.