湿天然气凝结流动的双组分模型

Two-component Model For Wet Natural Gas Condensing Flow

基于气液相间滑移的影响,建立了适用于湿天然气凝结系统的水蒸气-甲烷双组分自发凝结流动数理模型,研究了水蒸气在以甲烷为载气的超声速流动中的凝结规律,对比了不考虑相间滑移的单流体模型与加入了相间滑移因素的双组分模型在自发凝结过程中的凝结规律的区别,分析了压力、温度对湿天然气在Laval喷管中自发凝结的影响.结果表明,湿天然气中相间滑移作用对凝结参数影响较大,本文建立的包含相间滑移因素的双组分模型能更准确的预测湿天然气的凝结特性;在凝结初始阶段相间滑移速度较大达到7.2 m/s,对湿天然气的自发凝结规律影响较大,随凝结过程的不断进行气液两相逐渐达到平衡,相间滑移速度逐渐降低至1.8 m/s;随入口温度的降低、入口压力的升高最大凝结成核率位置向入口方向移动。

Based on the influence of inter-phase, a two-component condensing model is presented for the wet natural gas condensing system. On the basis, the supersonic condensation of the water vapor in the methane was discussed. Additionally, carrying on comparative analysis between the mono-component condensing model with no-slip inter-phase and the two-component condensing model. As well, the influence of inlet pressure and the inlet temperature on the condensation process were researched. The following conclusions were thus drawn. The inter-phase slip has significant effects in wet natural gas, and the proposed two-component model which takes the inter-phase slip into account can accurately predict the condensation of the wet natural gas. In the initial stages of condensation, the inter-phase velocity slip is 7.2 m/s which has significant effects in condensation of wet natural gas. With the process of condensation, the equilibrium state is reached, and then the inter-phase velocity slip is 1.8 m/s. With the decrease of the inlet temperature and the increase of the inlet pressure, the location of maximum nucleation rate is moving along.