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采用数值模拟的方法研究天然气管道减阻剂的雾化加注过程,首先对气体管道入口段的稳态流场进行模拟,得到收敛的气流场,再将减阻剂作为一系列离散相雾滴从入口喷嘴注入后进行耦合计算,分析各雾化条件对雾滴索泰尔平均直径(SMD)及其在入口段管壁上吸附特性的影响。模拟结果表明:喷雾压差、喷雾流量、喷嘴直径和喷射角度是影响天然气管道减阻剂减阻效果和减阻距离的关键因素。喷雾压差越大,喷雾流量越小,雾滴的SMD越小,越容易吸附在入口段的管壁上;喷嘴直径和喷射角度对雾滴的SMD影响不大,但喷射角度较小时,雾滴能被气流携带更长距离。研究成果可为天然气减阻剂的工程应用提供一定的理论指导。(图6,表5,参17)。
The numerical simulation method was used to study the atomization process of drag reduction agent in natural gas pipeline. First, the steady-state flow field at the inlet of gas pipeline was simulated to obtain the convergent gas flow field. Drag-reducing agent was used as a series of droplets After the injection from the inlet nozzle, the coupling calculation was carried out, and the influence of each atomization condition on the mean diameter (SMD) of the droplet and its adsorption characteristics on the pipe wall of the inlet section was analyzed. The simulation results show that spray pressure difference, spray flow rate, nozzle diameter and spray angle are the key factors affecting the drag reduction and drag reduction of natural gas pipeline DRA. The larger the spray pressure difference is, the smaller the spray flow rate is. The smaller the SMD of the droplet is, the easier it is to be adsorbed on the wall of the inlet section. The nozzle diameter and spray angle have little effect on the SMD droplet, but when the spray angle is small, Drops can be carried longer by airflow. The research results can provide certain theoretical guidance for engineering application of natural gas drag reducing agent. (Figure 6, Table 5, reference 17).