蓄热材料蓄放热过程数值模拟仿真

Numerical simulation of thermal process of heat storage materials

依据计算流体力学原理建立蓄热材料充填蓄热室热过程的数学模型,对其吸热和放热过程进行了数值模拟研究,实现了两相对流、传导、辐射的非稳态耦合计算。数值模拟结果清晰地显示了蜂窝蓄热体在蓄放热过程中随时间及换热流体温度、流速的不同而呈现出的极不均匀的温度分布,所得到的温度场、流场数据集以直观的视觉化形式表现出来,为蜂窝蓄热体蓄放热特性、结构尺寸及操作控制参数的优化等提供了又一个新的研究思路。

A preliminary success has been achieved in the research on utilizing CFD theory to estab- lish the numerical model about heat process of honeycomb regenerator filling regenerative heat exchanger, and the unsteady coupled computation of two phase convection, conduction and radiation was realized. It can simulate different operating modes ancl shapes of furnace. The result of the numerical simulation reveals clearly that, with the differences of time, heat - exchange liquid temperature and flowing rate in the process of heat storage and heat output, honeycomb regenerator temperature distribution isnt very uniform. The data set of the temperature field and flow field obtained from the numerical model can be shown in a visible form. It provides a new thinking for the research on the heat transfer, the optimization of structural size and the operation controlling parameter of the honeycomb rngenerator.