To mitigate the impact of renewable energy on the stable operation of power grids

the development of energy storage systems is necessary. Compressed air energy storage

as a large-scale long-duration energy storage system

has attracted widespread attention. In tunnel-type artificial caverns

heat exchange between the gas at the cavern end and the incoming cold airflow is limited during inflation. Consequently

the air temperature increases rapidly during pressurization

producing a pronounced temperature gradient between the inlet and the cavern end. The excessively high temperature affects the durability of the sealing materials at the end of the cavern

which is detrimental to the force-bearing of the sealing structure

necessitating the adoption of necessary temperature control measures. Based on the Bernoulli effect

this paper proposes a scheme to add a temperature control pipe at the central axis position of the cavern. By adjusting the airflow lines within the cavern

the mixing between incoming air and the existing air is enhanced

thereby promoting internal air circulation within the cavern. After optimizing the parameters of the temperature control scheme

the temperature difference within the cavern can be effectively reduced. The results show that the optimized scheme can keep the temperature difference within the underground cavern below 80 ℃

which has high practical value and research and development potential.