纯工质气液蒸发相变过程的数值处理研究

Study on numerical treatment of gas-liquid evaporation phase transition process of pure working fluid

总结归纳4种常见的气液相变模型,基于计算流体动力学(Computational Fluid Dynamics,CFD)方法,通过一维stefan问题和二维膜态沸腾问题对4种相变模型进行验证。结果表明:Hardt模型的准确性最好,膜态沸腾模型与孙东亮模型的准确性次之,Lee模型的准确性最低。Lee模型无法对膜态沸腾问题求得适当的解。孙东亮模型对二维膜态沸腾问题的描述没有膜态沸腾模型和Hardt模型准确。Lee模型和Hardt模型的蒸发系数选取对气液相变过程的模拟结果具有较大影响。

Four common gas-liquid phase transition models are summarized. Based on the Computational Fluid Dynamics(CFD) method, the four phase transition models are verified by one-dimensional stefan problem and twodimensional film boiling problem. The results show that the Hardt model has the best accuracy, followed by the film boiling model and the Sun Dongliang model, and the Lee model has the lowest accuracy. The Lee model cannot obtain a proper solution to the modal boiling problem. The description of the two-dimensional film boiling problem by the Sun Dongliang model is not as accurate as that of the film boiling model and Hardt model. The selection of the evaporation coefficient of the Lee model and the Hardt model has a great influence on the simulation results of the gas-liquid phase transition process.