为研究热电池激活过程的内部温度变化及激活时间,考虑到热源点火间隔及放热反应区的移动对激活性能的影响,运用用户自定义函数(user defined function,UDF)编写相应热源函数程序来模拟激活过程中点火头、引燃条和加热片的顺序燃烧和热释放,对激活时间及开路电压进行预测.结果表明:忽略热源点火间隔时,各层电解质温度达到熔点的时间近乎相同;考虑热源点火时间间隔时,随着电解质层数的增加,各层电解质达到熔点的时间逐渐增加,热电池的激活时间由底层电解质达到熔点的时间决定;开路电压达到峰值需要一定的过渡时间;相较于忽略热源点火间隔,考虑热源点火时间间隔更符合实际情况.模型和仿真方法能够体现点火头、引燃条和加热片释放热量与热传导过程.
Simulation analysis of thermal battery activation process based on UDF heat source function
This paper studied the internal temperature change and activation time during the activa-tion process of the thermal battery,considering the ignition interval of the heat source and the move-ment of the exothermic reaction zone.The corresponding heat source function program was written by using the user-defined function(UDF)to simulate the sequential combustion and heat release of the ignition head,ignition strip and heating plate during the activation process,and the activation time and open-circuit voltage were predicted.The results show that when ignoring the ignition inter-val of the heat source,the time for the electrolyte temperature to reach the melting point is almost the same.Considering the ignition time interval of the heat source,with the increase of the number of electrolyte layers,the time for the electrolyte to reach the melting point of each layer gradually in-creases,and the activation time of the thermal battery is determined by the time when the bottom electrolyte reaches the melting point.And a certain transition time is required for the open circuit voltage to reach its peak value.Compared with ignoring the ignition interval of the heat source,it is more in line with the actual situation to consider the ignition interval of the heat source.It is shown that the model and simulation method can reflect the heat release and heat conduction process of the ignition head,ignition strip and heating sheet.
万方数据
维普
