基于格子波尔兹曼方法的分层丝网回热器流动特性模拟
|
摘要
分层丝网回热器被广泛应用于低温机械制冷机中。通过构建单一目数丝网回热器与分层丝网回热器微观物理模型,利用格子玻尔兹曼方法(LBM),直接对不同结构丝网回热器流场进行了数值模拟,得到了不同结构丝网回热器的微观流场和两端的无量纲压差。模拟结果显示,LBM能有效预测丝网回热器的稳态流动阻力系数。对于分层丝网回热器,随着入口速度的增加,丝网回热器内整体流场的速度分布不均匀性增大,分层丝网回热器最大流速与无量纲压降主要受低目数丝网的特性决定。
Multi-layer mesh screen regenerators are widely used in crycoolers. A simulation study on the flow characteristics of a multi-layer mesh screen regenerator using lattice Boltzmann Method( LBM) was conducted. Based on the different 3D mech screen regenerator models,the flow characteristics including the dimensionless pressure drop and velocity fields were numerically obtained. The simulation results of friction factor agreed with the data reported in the literatures. Uneven flow distribution was observed in the multi-layer mesh screen regenerator. Simulation results show that the maximum velocity and dimensionless pressure drop of the multi-layer mesh screen regenerator are mainly depended on the characteristics of the layer with a low mesh size.
Multi-layer mesh screen regenerators are widely used in crycoolers. A simulation study on the flow characteristics of a multi-layer mesh screen regenerator using lattice Boltzmann Method( LBM) was conducted. Based on the different 3D mech screen regenerator models,the flow characteristics including the dimensionless pressure drop and velocity fields were numerically obtained. The simulation results of friction factor agreed with the data reported in the literatures. Uneven flow distribution was observed in the multi-layer mesh screen regenerator. Simulation results show that the maximum velocity and dimensionless pressure drop of the multi-layer mesh screen regenerator are mainly depended on the characteristics of the layer with a low mesh size.
引文
[1]Imura J,Shinoki S,Sato T,et al. Development of high capacity Stirling type pulse tube cryocooler[J]. Physica C:Superconductivity and its Applications,2007,(463-465):1369-1371.
[2]黄小兰,蒋珍华,陈曦,等.斯特林制冷机分层回热器优化设计与实验[J].低温工程,2014(02):14-18.
[3]Grissa K,Chaabane R,Lataoui Z,et al. Lattice Boltzmann model for incompressible axisymmetric thermal flows through porous media[J]. Physical Review E,2016,94(4):043306.
[4] Rong F,Guo Z,Chai Z,et al. A lattice Boltzmann model for axisymmetric thermal flows through porous media[J]. International Journal of Heat and Mass Transfer,2010,53(23):5519-5527.
[5]Dai Q,Yang L. LBM numerical study on oscillating flow and heat transfer in porous media[J]. Applied Thermal Engineering,2013,54(1):16-25.
[6]夏宇栋,陈曦,马诗旻,等.基于格子波尔兹曼方法的回热器数值模拟[J].低温工程,2012,(05):41-45.
[7]何雅玲,王勇,李庆.格子Boltzmann方法的理论及应用[M].北京:科学出版社,2008.
[8] Qian Y H,D'humires D,Lallemand P. Lattice BGK models for navier-stokes equation[J]. Europhysics Letters,2007,17(6):479.
[9] Latt J. Hydrodynamic limit of lattice Boltzmann equations[D]. Genève:Universitéde Genève,2007.
[10]Chen S,Martnez D,Mei R. On boundary conditions in lattice Boltzmann methods[J]. Physics of Fluids,1998,8(9):2527-2536.
[11] Helvensteijn B P M,Kashani A,Spivak A L,et al.Pressure drop over regenerators in oscillating flow[J].Advances in Cryogenic Engineering,1998,43:1619-1626.
[12]Miyabe H,Hamaguchi K,Takahashi K. An approach to the design of Stirling engine regenerator matrix using packs of wire gauzes[C]//17th Intersociety of Energy Conversion Engineering Conference,1982.
[2]黄小兰,蒋珍华,陈曦,等.斯特林制冷机分层回热器优化设计与实验[J].低温工程,2014(02):14-18.
[3]Grissa K,Chaabane R,Lataoui Z,et al. Lattice Boltzmann model for incompressible axisymmetric thermal flows through porous media[J]. Physical Review E,2016,94(4):043306.
[4] Rong F,Guo Z,Chai Z,et al. A lattice Boltzmann model for axisymmetric thermal flows through porous media[J]. International Journal of Heat and Mass Transfer,2010,53(23):5519-5527.
[5]Dai Q,Yang L. LBM numerical study on oscillating flow and heat transfer in porous media[J]. Applied Thermal Engineering,2013,54(1):16-25.
[6]夏宇栋,陈曦,马诗旻,等.基于格子波尔兹曼方法的回热器数值模拟[J].低温工程,2012,(05):41-45.
[7]何雅玲,王勇,李庆.格子Boltzmann方法的理论及应用[M].北京:科学出版社,2008.
[8] Qian Y H,D'humires D,Lallemand P. Lattice BGK models for navier-stokes equation[J]. Europhysics Letters,2007,17(6):479.
[9] Latt J. Hydrodynamic limit of lattice Boltzmann equations[D]. Genève:Universitéde Genève,2007.
[10]Chen S,Martnez D,Mei R. On boundary conditions in lattice Boltzmann methods[J]. Physics of Fluids,1998,8(9):2527-2536.
[11] Helvensteijn B P M,Kashani A,Spivak A L,et al.Pressure drop over regenerators in oscillating flow[J].Advances in Cryogenic Engineering,1998,43:1619-1626.
[12]Miyabe H,Hamaguchi K,Takahashi K. An approach to the design of Stirling engine regenerator matrix using packs of wire gauzes[C]//17th Intersociety of Energy Conversion Engineering Conference,1982.