【摘要】 建立了适用于基本型、小孔型和双向进气型等脉管制冷机整机模拟的一维和二维混合计算模型,采用Darcy-Brinkman-Forchheimer模型和局部非热平衡模型描述回热器内部的流动与换热,并给出了一维与二维计算区域连接界面的速度和温度等重要参数的传递法则.开发了基于1-2混合计算模型的脉管制冷机整机数值模拟程序,对3种脉管制冷机主要部件的流场和温度场特性进行了详细分析,直观地刻画了脉管制冷机内的工作过程以及复杂流动和换热现象,例如"速度转向"、"速度环效应"、"温度环效应"和DC流等.结果表明,双向进气阀的引入形成了脉管制冷机的闭合回路,带来了DC流现象,文中运行参数下的DC流占总流量的4.66%.更多还原

【Abstract】 A one-dimensional and two-dimensional combined computational model(1-D & 2-DCC model) was set up to simulate the performances of the basic type,orifice type and double inlet type pulse tube refrigerators(PTRs).The Darcy-Brinkman-Forchheimer model and the thermally non-equilibrium model were adopted to depict the flow and heat transfer in the regenerator which was modeled by taking the mesh as a porous medium.Parameter communicating algorithms were defined to calculate velocity and temperature at the junctions between the 1-D & 2-D computational regions.Then the simulation codes for the whole PTRs were developed.The working process and complex flow phenomena such as velocity and temperature annular effects and DC flow in PTRs were revealed.The results show that a close loop in the PTR can be formed by using a double-inlet valve which leads to the occurrence of DC flow.For the case studied,the DC flow rate accounts for 4.66% of the total mass flow rate under the present parameters and working conditions.更多还原