基于热力学理论的涡流管制冷特性研究

Study on refrigeration characteristics of vortex tube based on thermodynamics

为探究热力学理论对应用于创造矿下人工环境的涡流管制冷特性的影响,基于涡流管的能量交换和分离的原理,利用热力学第一定律和热力学第二定律的理论,分析涡流管内部流体热力学特性,探求冷、热流体能量分离机理,获得其制冷特性;利用三维的流体域耦合方法,建立的连续-非连续模型,通过不同数学模型和不同计算方法的计算,与Aljuwayhel的实验结果进行对比,以制冷效应差异作为判定指标,确定了使用SIMPLEC算法实现压力和速度耦合变量的分离求解,采用各向异性的雷诺应力RSM湍流模型最为精准,计算得到制冷效应偏差在12%以内;涡流管内流场的分析可知,管内的流体速度、流体压力、温度流场分布与基于热力学设计的理论基本相符,模拟的管内内部流体温度分离引起的静温变化是由流体热量和功转换所引起的结论,验证了涡流管内部能量传递过程。

In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine,based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube,the energy separation mechanism are explored,and the refrigeration characteristics are obtained.Using the three-dimensional fluid domain coupling method,the continuous-discontinuous model is established.Through the calculation of different mathematical models and different calculation methods,it is compared with the experimental results of Aljuwayhel.With the difference of refrigeration effect as the judgment index,the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm.The anisotropic Reynolds stress RSM turbulence model is the most accurate,and the deviation of refrigeration effect is calculated within 12%.The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity,fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design.The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.