安全壳整体性试验过程壳内气体状态仿真分析OA

Regarding the evaluation of physical state change of the gas inside the containment vessel caused by the increase in the pressurization rate during the integrity test of the containment vessel,based on the computational fluid dynamics analysis method,a detailed simulation analysis model of the fluid domain inside the containment vessel was first established.Then,the reliability of the model was verified using historical data from the integrity test of the containment vessel.Based on the validated model,an analysis is conducted on the gas movement inside the containment after increasing the pressurization rate to 45 kPa/h.The results show that the gas inside the containment generally flows slowly,with a maximum average gas velocity of only 0.245 m/s.The temperature of the gas inside the containment exhibits a non-linear change.The average temperature of the gas inside the containment is increased by 12.85 K.During the pressurization process,the gas pressure inside the containment is generally evenly distributed,and except for a range of 1.8 meters near the pressurization port,the pressure gradient in all other areas does not exceed 5 Pa.