基于移动气流口的新型储热填充床动态特性分析OA

To address outlet temperature fluctuations in conventional packed-bed thermal energy storage(TES)systems,this study proposes a novel packed bed with moving inlet and outlet.By dynamically moving the inlet and outlet along the longitudinal direction,the system achieves quasi-stable thermocline motion.As a result,temperature fluctuations during the charging and discharging processes are reduced to 38.61%and 28.66%,respectively,improving both outlet airflow quality and system stability.A transient heat transfer model was developed for the new packed bed,and three-dimensional dynamic numerical simulations were carried out under continuous charging and discharging conditions.The effects of inlet/outlet movement mode,operating conditions,and packing materials on dynamic thermal storage characteristics were systematically investigated.The results show that a packed bed with a 4∶1 aspect ratio offers a favorable balance between efficiency and stability.Although reducing particle size improves efficiency,it also reduces system stability.For a packed bed with relative dimensions of 4∶1∶15(length∶width∶height)and a total volume of 0.06 m3,stable cyclic operation with a 95.76%thermal efficiency was achieved at a 0.007 kg/s mass flow rate and 6250 s charging/discharging times.In addition,the 93%inlet and outlet movement range alleviates the temperature lag effect,enhances cyclic performance,and enables long-term operation with low fluctuations.This study provides a new technical route and theoretical basis for applying moving inlet and outlet packed beds in large-scale high-temperature TES systems.