大管径八流道螺旋喷嘴涡流管流动与传热数值模拟

为了探究大管径涡流管内流场分布规律和冷热分离机理,建立大管径八流道螺旋喷嘴涡流管三维模型,选取甲烷作为工质气体进行数值模拟,并对相关物理场进行重点分析。研究结果表明:涡流管内径向存在一环形区域,内外旋流气体在区域内相互剧烈作用,总压迅速减小,不可逆熵增大,能量快速传递,总温产生分离;同时,在一定入口总压、总温下,调节热端出口背压,涡流管存在最佳的制冷、制热温差以及最优的制冷、制热量,且同一冷流比下,工质气体的单位制冷量要优于单位制热量。

Numerical Simulation of Flow and Heat Transfer of Spiral Nozzle in Large-diameter Eight-Flow Spiral NozzleHe Peng, Zhang Shuqin ,Zhang Chengbin

In order to fully explore the flow field distribution law and energy separation principle in large diameter vortex tube, a three-dimensional model of a large-diameter eight-flow spiral nozzle vortex tube was established.Methane was selected as the numerical simulation for working gas and related physical quantities. A comparative analysis was conducted. The results show that there is an annular region in the radial direction of the vortex tube. The internal and external swirling gases interact strongly in the region, the total pressure decreases rapidly, the irreversible entropy increases, the energy is transmitted quickly, the total temperature is separated, and at the same time, the total inlet is always Pressing, adjusting the back pressure of the hot end outlet, the vortex tube has the best ratio of cooling to heating and cold flow.