新型超音速分离器内非平衡凝结流动数值研究

A numerical study of a non-equilibrium condensation flow in a supersonic separator

针对实际开采中高压天然气的含水问题,结合动力学和热力学原理,设计了一套前置式超音速脱水装置.采用UDF将液相控制方程和其他控制方程的源相编入FLUENT中,建立了含有自发凝结的三维双组份流动计算模型,研究了含湿天然气在超音速分离器中的凝结过程,并分析了不同进口条件对过冷度、成核位置、极限成核率等凝结参数的影响.结果表明:所建立三维数值模型能够较好的揭示超音速分离管内部凝结参数的分布规律;而且入口压力和入口温度对于特定结构的分离管内部的液滴成核及生长过程有显著影响,在工业应用中,可以适当考虑调整入口温度和压力来提高分离效率.

Aiming at solving the problem of the high-pressure natural gas containing water vapor in real oil production,a type of supersonic separation structure is designed according to gas field condition and gas well drilling technology parameters.Based on UDF that codifies liquid phase governing equations and the source terms of other governing equations in the FLUENT software,a two-phase bi-component three-dimensional turbulent model was developed to simulate the process of the wet natural gas supersonic condensation.Effects of entrance parameters on starting location of spontaneous nucleation,as well as the change of subcooled degree and the nucleation,were investigated.The results showed that the developed condensation model can reasonably reveal the distribution profile of condensation flow field in the supersonic separation tube;the condensation process inside the supersonic separator varies obviously due to the change of the initial pressure and temperature.It is concluded that the efficiency of separation can be improved further by adjusting the inlet conditions appropriately in industrial applications.