旋流式发生器内部气-液两相流场的数值模拟研究

Numerical simulation of gas-liquid two-phase flow field inside a swirl generator

在一定的冷负荷下,文章对以耦合热源驱动吸收式热泵的发生器内部气-液分离率进行了研究。采用RNG k-ε湍流和多相流Mixture模型,通过Fluent软件对旋流式发生器的传热传质过程进行数值模拟,得到内部的速度、压力和气-液相态的分布情况。模拟结果表明,旋流器内部分离段径向压力分布呈现阶梯状。随着溶液入口速度的增加,分离段流体扰动更加剧烈,所受离心力不断增大,发生器内部的压降也随之增大,充分降低了溶液的饱和温度,有利于溶液中水的蒸发。与传统发生器比较,在同样制冷量的情况下,旋流式发生器可以降低驱动热源温度,提高对低温废热的利用率。

Under a certain cooling load,the internal gas-liquid separation rate of the generator driven by the coupled heat source of the absorption heat pump is studied.Using the RNG k-ε turbulent flow and multiphase flow Mixture model,the heat and mass transfer process of the cyclone generator was numerically simulated by Fluent software,and the internal velocity,pressure and gas-liquid phase distribution were obtained.The simulation results show that the radial pressure distribution of the separation section inside the cyclone is stepped.With the increase of the inlet velocity of the solution,the fluid disturbance in the separation section is more severe,the centrifugal force is continuously increased,and the pressure drop inside the generator also increases,which fully reduces the saturation temperature of the solution and is conducive to the evaporation of water in the solution.Compared with the traditional generator,under the same cooling capacity,the cyclone generator can reduce the temperature of the driving heat source and improve the utilization rate of low-temperature waste heat.