热水蓄热技术是解决我国热电耦合问题，提高热电系统和电网消纳可再生能源能力的重要手段。通过数值模拟方法研究水箱内置隔板的直径、高度和厚度对热分层特性的影响，基于理查森数、分层数和火用效率等性能指标，得到不同隔板设计尺寸对温度分层的影响规律，并提出隔板的结构优化设计方法。结果表明：内置隔板对水箱内冷热水掺混程度的抑制作用和对水箱内温度分层的改善效果与流体的流动参数及温度密切相关，当隔板高度为19.275 m，直径为10 m，厚度为0.3 m时具有最佳的热分层特性。

Hot water heat storage technology is an important means to solve the problem of thermoelectric coupling and improve the capacity of thermoelectric system and power grid to absorb renewable energy. The effects of the diameter, height and thickness of the baffle plate of water tank on thermal stratification characteristics are studied by numerical simulation method. Based on Richardson number, stratification number, exergy efficiency and other performance indexes, the influence rules of different baffle plate design sizes on temperature stratification are obtained, and the structural optimization design method of baffle plate is proposed. The results show that the baffle plate can inhibit the mixing degree of hot and cold water and improve the temperature stratification in the water tank, which is closely related to the flow parameters and temperature of the fluid. When the height, diameter and thickness of the baffle plate are 19.275 m, 10 m and 0.3 m respectively, it can provide the best thermal stratification characteristics.

TK114