Flow and heat transfer performance in transpiration pore structure based on LBM
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摘要:
以发汗冷却技术为背景,采用D3Q19格子玻尔兹曼方法程序,在孔隙尺度下研究了多孔介质结构对结构温度场的影响。针对球形颗粒堆积结构和随机结构这两种常用的多孔结构,分别计算分析了渗透率和固体温度分布。结果表明:对于颗粒堆积结构,当颗粒规则排列时,其固体温度分布呈明显的阶梯状;而颗粒无规则排列时,固体温度变化趋势比较平稳,并且随着颗粒直径的增大,渗透率增大,固体温度降低。对于随机多孔结构,随着孔隙尺寸减小,渗透率减小,固体温度升高。在0.3~0.5的孔隙率范围内,颗粒堆积结构和随机结构由于内部对流换热强度的不同,固体温度具有不同的变化特点。
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关键词:
- 发汗冷却 /
- 多孔介质 /
- 格子Boltzmann方法 /
- 孔隙尺度 /
- 传热
Abstract:With the background of transpiration cooling technology, the influence of porous media structure on structure temperature field was investigated at pore scale by using D3Q19 lattice Boltzmann method program. The permeability and solid temperature distributions of two commonly used porous structures: spherical particle packing structure and random structure, were simulated and analyzed respectively. The results showed that for the particle packing structure, when the particles were arranged regularly, the solid temperature distribution showed an obvious ladder shape; when the particles were arranged irregularly, the solid temperature change trend was relatively stable, and with the increase of particle diameter, the permeability increased and the solid temperature decreased. For random porous structure, with the decrease of pore size, permeability decreased and solid temperature increased. In the porosity range of 0.3—0.5, due to the different internal convection heat transfer intensity of particle packing structure and random structure, the solid temperature had different variation characteristics.
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Key words:
- transpiration cooling /
- porous media /
- lattice Boltzmann method /
- pore scale /
- heat transfer
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