矩形腔相变蓄热装置蓄热性能的数值模拟及优化

Numerical simulation and optimization of heat transfer characteristics of rectangular cavity phase change heat storage

为了提高矩形腔蓄热装置的蓄热性能,文章在矩形腔蓄热装置内构造了不同数量的空腔,并通过数值模拟分析了不同数量、长度和倾角的空腔对矩形腔蓄热装置蓄热性能的影响。研究发现:当矩形腔蓄热装置内有2个空腔时,其蓄热速率比无空腔的常规矩形腔蓄热装置提高27.3%;当矩形腔蓄热装置的空腔长度为35mm时,其蓄热时间比无空腔的常规矩形腔蓄热装置缩短45%;水平空腔(空腔的倾角为0°)有利于矩形腔蓄热装置蓄热速率的提升,斜空腔并不会提升矩形腔蓄热装置的蓄热速率。

In view of the poor performance of traditional heat storage, this paper adopted the method of numerical simulation, explored the heat transfer characteristics of traditional rectangular heat storage in its heat storage process. In order to improve performance of the heat storage, this paper presented a new type of heat storage with the cavity which is different in the accumulation of number, length, angle of the cavity. By changing the number of cavity, the heat storage rate was increased by 27.3% compared with the traditional rectangular heat storage. By changing the length of cavity, it was found that when the length of the cavity was 35 mm, the heat storage time was reduced by 45% compared with the traditional rectangular heat storage. Finally, by changing the cavity inclination, it was found that the horizontal cavity（the angle of 0 °） is optimal to the promotion of regenerative effect, inclined cavity had no positive effect, and it could bring negative effects.