在传统螺旋翅片基础上提出3种不同压缩比的螺旋翅片结构。首先数值模拟不同压缩比的螺旋翅片储能罐相变材料的熔化过程;其次,讨论4个储能罐中温度场和固液界面的演变情况;再次,分析液相分数、平均温度和平均努塞尔数的变化趋势;最后,对比不同压缩比下相变材料的总蓄热量、熔化时间和平均蓄热速率。结果表明：设计压缩比合适的螺旋翅片可有效促进储能装置相变材料的熔化,减轻下部温度垂直分层现象,增强相变材料的自然对流,提升相变储能罐的蓄热性能;随着压缩比的增加,蓄热速率呈先增加后减小的趋势,而完全熔化时间则先减少后增加;与无压缩螺旋翅片的储能罐相比,当压缩比为3时,石蜡完全熔化时间缩短27.27%,平均蓄热速率提升33.33%,但当压缩比增加到7时,平均蓄热速率反而下降25%,完全熔化时间增加34.67%。
Abstract
Three different compression ratios of spiral fins structures are proposed based on traditional spiral fins to significantly enhance the heat transfer of phase-change energy storage devices. Initially, numerical simulations are conducted to investigate the melting process of phase change materials in energy storage tanks with varying compression ratios of spiral fins. Subsequently, the evolution of the temperature field and solid-liquid interface in four energy storage tanks is discussed. The variations of the liquid fraction, average temperature, and average Nusselt number are then analyzed. Following this, the total heat storage capacity, melting time, and average heat storage rate of phase-change materials under different compression ratios are compared. The research results demonstrate that appropriately designing spiral fins with the correct compression ratio effectively promotes the melting of phase change materials in energy storage devices, alleviates the vertical temperature stratification phenomenon, enhances the natural convection of phase change materials, and improves the heat storage performance of phase-change energy storage tanks. It is observed that with an increase in the compression ratio, the heat storage rate initially increases and then decreases while the melting time decreases first and then increases. When the compression ratio is 3, compared to the energy storage tank without compressed spiral fins, the complete melting time of paraffin is shortened by 27.27% and the average heat storage rate is increased by 33.33%. However, with a compression ratio of 7, the average heat storage rate decreases by 25%, and the complete melting time increases by 34.67%.
关键词
翅片 /
相变材料 /
蓄热 /
压缩比 /
储能装置 /
数值模拟
Key words
fins /
phase change materials /
heat storage /
compression ratio /
energy storage device /
numerical simulation
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基金
河北省自然科学基金（E2022502001）
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