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For the accumulator filled with phase change material thermal conductivity is low, heat storage time is long and other shortcomings, this paper establishes the concentric triplex tube regenerative heat exchanger builtin intermittent twisted fin model, the use of Fluent software for the melting process of the internal phase change material for the threedimensional unsteady numerical simulation of the structure of the structure of the different twisted fin number and the degree of twisted degree, analyze the phase change material liquid phase rate, the average temperature, the amount of heat storage and the average heat storage rate rule of law with time. Simulation results show that in this paper, compared with the triplex tube regenerative heat exchanger within the research parameters, with the increase of the degree of twist, the complete melting time is gradually shortened, when the twist rate is 2.5, the complete melting time can be reduced by up to 33.1%, with the increase in the number of twisted fins can also shorten the complete melting time, when the number of twisted fins is 4 complete melting time can be reduced by a maximum of 25.6%. The inclusion of intermittent twisted fin significantly shortens the complete melting time of the phase change material and enhances the heat storage capacity, which helps to improve the comprehensive heat storage performance of the triplex tube regenerative heat exchanger.
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针对蓄热器內填充的相变材料热导率低、充热时间长等缺点,文章建立了同心三套管相变蓄热器内置间断扭曲肋的模型,使用 Fluent 软件对其内部相变材料熔化过程进行三维非稳态数值模拟,对比、分析此结构在不同扭曲肋头数和扭曲程度的条件下,相变材料液相率、平均温度、充热量和平均充热率随时间变化规律。结果表明:在研究参数范围内,随着扭曲程度的增大,相变材料完全熔化时间逐渐缩短,当扭率为2.5 时完全熔化时间最大可减少33.1%;随着扭曲肋头数的增加,相变材料完全熔化时间同样逐渐缩短,当扭曲头数为4时完全熔化时间最大可减少25.6%。间断扭曲肋的加入使相变材料完全熔化时间明显缩短,充热能力有所增强,有助于提高三套管相变蓄热器综合性能。
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2 铁道车辆热工教育部重点实验室 甘肃 兰州 730070)])], figs=[ArticleFig(id=1159145763533345363, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 1, caption=
Schematic diagram of a triplex tube regenerative heat exchanger with built-in interrupted isosceles trapezoidal twisted fins, figureFileSmall=4axlf5/iJozIFambLNwCXg==, figureFileBig=USWdguQDUc5wH9wkOSKRQQ==, tableContent=null), ArticleFig(id=1159145763596259924, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 1, caption=
内插间断等腰梯形扭曲肋的三套管蓄热器示意图, figureFileSmall=4axlf5/iJozIFambLNwCXg==, figureFileBig=USWdguQDUc5wH9wkOSKRQQ==, tableContent=null), ArticleFig(id=1159145763650785877, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 2, caption=
Grid system of computational domain, figureFileSmall=IUwAji2RaTR4e6BKKI2Kxg==, figureFileBig=1kyRLNLSYeKog6nnSM8A0A==, tableContent=null), ArticleFig(id=1159145763738866262, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 2, caption=
计算域的网格示意图, figureFileSmall=IUwAji2RaTR4e6BKKI2Kxg==, figureFileBig=1kyRLNLSYeKog6nnSM8A0A==, tableContent=null), ArticleFig(id=1159145763797586519, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 3, caption=
The effect of the number of grids on the liquid fraction, figureFileSmall=y10gvGAwsMdOEjDUV3Tq1w==, figureFileBig=8ZqEf2GXaDIsTnQpGA/3SQ==, tableContent=null), ArticleFig(id=1159145763843723864, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 3, caption=
网格数量对液相率的影响, figureFileSmall=y10gvGAwsMdOEjDUV3Tq1w==, figureFileBig=8ZqEf2GXaDIsTnQpGA/3SQ==, tableContent=null), ArticleFig(id=1159145763889861209, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 4, caption=
Model validation, figureFileSmall=EfM0QZeZuw2yJLmhrt+iPg==, figureFileBig=bUHxyguGZywyDXUYm9WRsA==, tableContent=null), ArticleFig(id=1159145763931804250, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 4, caption=
模型验证, figureFileSmall=EfM0QZeZuw2yJLmhrt+iPg==, figureFileBig=bUHxyguGZywyDXUYm9WRsA==, tableContent=null), ArticleFig(id=1159145763977941595, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 5, caption=
Schematic diagrams of the intercepted axial and radial positions, figureFileSmall=HHP6aQyohM9ULe89KLz6JQ==, figureFileBig=6BmPTzoA0Hsd7EB47yVpWQ==, tableContent=null), ArticleFig(id=1159145764028273244, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 5, caption=
所截取的轴向及径向位置示意图, figureFileSmall=HHP6aQyohM9ULe89KLz6JQ==, figureFileBig=6BmPTzoA0Hsd7EB47yVpWQ==, tableContent=null), ArticleFig(id=1159145764066021981, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 6, caption=
Temperature cloud plots of phase change material with different twisted degree, figureFileSmall=+8DhgN19emiFfFhj8PFhXg==, figureFileBig=WaGMWjXhafclfMCxBwouQg==, tableContent=null), ArticleFig(id=1159145764124742238, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 6, caption=
不同扭曲程度下相变材料的温度云图, figureFileSmall=+8DhgN19emiFfFhj8PFhXg==, figureFileBig=WaGMWjXhafclfMCxBwouQg==, tableContent=null), ArticleFig(id=1159145764166685279, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 7, caption=
Liquid fraction cloud plots of phase change material with different twisted degree, figureFileSmall=OyuOtoLNx091IOjuQcYUAw==, figureFileBig=Lmk1BUlZKB0noMUO/ydE9g==, tableContent=null), ArticleFig(id=1159145764225405536, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 7, caption=
不同扭曲程度下相变材料的液相率云图, figureFileSmall=OyuOtoLNx091IOjuQcYUAw==, figureFileBig=Lmk1BUlZKB0noMUO/ydE9g==, tableContent=null), ArticleFig(id=1159145764271542881, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 8, caption=
Velocity vectors under natural convection, figureFileSmall=P+Q2vdN+rPXv0DVeAJt5ag==, figureFileBig=vAoLYM6lkaUlt3s/ZfkDMg==, tableContent=null), ArticleFig(id=1159145764334457442, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 8, caption=
自然对流下的速度云图, figureFileSmall=P+Q2vdN+rPXv0DVeAJt5ag==, figureFileBig=vAoLYM6lkaUlt3s/ZfkDMg==, tableContent=null), ArticleFig(id=1159145764380594787, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 9, caption=
Variation of PCM parameters with time, figureFileSmall=Wiu8BdE7eB5RvegBaAw7cA==, figureFileBig=mooMcSSF5fqUaywsU3SJKg==, tableContent=null), ArticleFig(id=1159145764430926436, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 9, caption=
PCM 各参数随时间变化, figureFileSmall=Wiu8BdE7eB5RvegBaAw7cA==, figureFileBig=mooMcSSF5fqUaywsU3SJKg==, tableContent=null), ArticleFig(id=1159145764472869477, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 10, caption=
Temperature cloud plots of phase change material with different twisted fin quantities, figureFileSmall=R1UGGSwK1a2MU92r1znMsA==, figureFileBig=KRFiPXjNCwyd5WK4HSnBQQ==, tableContent=null), ArticleFig(id=1159145764523201126, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 10, caption=
不同肋头数下相变材料的温度云图, figureFileSmall=R1UGGSwK1a2MU92r1znMsA==, figureFileBig=KRFiPXjNCwyd5WK4HSnBQQ==, tableContent=null), ArticleFig(id=1159145764577727079, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 11, caption=
Liquid fraction cloud plots of phase change material with different twisted fin quantities, figureFileSmall=RdqW1jnRD7+I+UThkUPbXA==, figureFileBig=acyvfGR53JScN7zouFQY0Q==, tableContent=null), ArticleFig(id=1159145764649030248, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 11, caption=
不同肋头数下相变材料的液相率云图, figureFileSmall=RdqW1jnRD7+I+UThkUPbXA==, figureFileBig=acyvfGR53JScN7zouFQY0Q==, tableContent=null), ArticleFig(id=1159145764695167593, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 12, caption=
Velocity vectors under natural convection, figureFileSmall=nHzkonB7u5EM7WvLWKL0LQ==, figureFileBig=8ejTTqWEkrwlvGTMRq0BEA==, tableContent=null), ArticleFig(id=1159145764741304938, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 12, caption=
有自然对流下的速度云图, figureFileSmall=nHzkonB7u5EM7WvLWKL0LQ==, figureFileBig=8ejTTqWEkrwlvGTMRq0BEA==, tableContent=null), ArticleFig(id=1159145764795830891, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Fig. 13, caption=
Variation of PCM parameters with time, figureFileSmall=PEFh8Kt+ZfhhubRSr9NgzA==, figureFileBig=a4X2DCZ7GuimBwWJ1oBSbg==, tableContent=null), ArticleFig(id=1159145764846162540, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=图 13, caption=
PCM 各参数随时间变化, figureFileSmall=PEFh8Kt+ZfhhubRSr9NgzA==, figureFileBig=a4X2DCZ7GuimBwWJ1oBSbg==, tableContent=null), ArticleFig(id=1159145764904882797, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=EN, label=Table 1, caption=
Physical properties of materials, figureFileSmall=null, figureFileBig=null, tableContent=
| 物性 | 月桂酸 | 铜 |
| 密度 $\rho /\mathrm{{kg}} \cdot {\mathrm{m}}^{-3}$ | 885 | 8978 |
| 比热容 ${C}_{p}/\mathrm{{kJ}} \cdot {\left( \mathrm{{kg}} \cdot \mathrm{K}\right) }^{-1}$ | 2.390 | 0.381 |
| 热导率 $k/\mathrm{W} \cdot {\left( \mathrm{m} \cdot \mathrm{K}\right) }^{-1}$ | 0.147 | 387.6 |
| 热膨胀系数 $\beta /{\mathrm{K}}^{-1}$ | 0.000 615 | |
| 熔化潜热 $L/\mathrm{{kJ}} \cdot {\mathrm{{kg}}}^{-1}$ | 187.21 | |
| 动力粘度 $\mu /\mathrm{{Pa}} \cdot \mathrm{s}$ | 0.005 336 | |
| 固相点 ${T}_{\mathrm{s}}/\mathrm{K}$ | 316.65 | |
| 液相点 ${T}_{\mathrm{i}}/\mathrm{K}$ | 321.35 | |
), ArticleFig(id=1159145764967797358, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988800650306152, language=CN, label=表 1, caption=
各材料物性参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 物性 | 月桂酸 | 铜 |
| 密度 $\rho /\mathrm{{kg}} \cdot {\mathrm{m}}^{-3}$ | 885 | 8978 |
| 比热容 ${C}_{p}/\mathrm{{kJ}} \cdot {\left( \mathrm{{kg}} \cdot \mathrm{K}\right) }^{-1}$ | 2.390 | 0.381 |
| 热导率 $k/\mathrm{W} \cdot {\left( \mathrm{m} \cdot \mathrm{K}\right) }^{-1}$ | 0.147 | 387.6 |
| 热膨胀系数 $\beta /{\mathrm{K}}^{-1}$ | 0.000 615 | |
| 熔化潜热 $L/\mathrm{{kJ}} \cdot {\mathrm{{kg}}}^{-1}$ | 187.21 | |
| 动力粘度 $\mu /\mathrm{{Pa}} \cdot \mathrm{s}$ | 0.005 336 | |
| 固相点 ${T}_{\mathrm{s}}/\mathrm{K}$ | 316.65 | |
| 液相点 ${T}_{\mathrm{i}}/\mathrm{K}$ | 321.35 | |
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