中文摘要：

在新建长输天然气管道水压试验后的通球扫线过程中,由于地形变化剧烈、泄漏等原因,使得清管器下游的水流中包含气塞。为了评估气塞对扫水过程的影响,耦合考虑了清管器、气塞段和液塞段的运动,建立通球扫水过程的力学模型,研究扫水过程中气塞的状态及其对清管器运行速度的影响。结果表明：清管器运行速度的变化主要与管线的高程相关,气塞的长度在高程剧烈变化区段产生很大的变化,对清管器的运行产生冲击,气塞的存在是扫水过程不稳定的重要原因。

英文摘要：

After the water pressure testing of long-distance gas pipelines,due to the dramatic change of the terrain and the leakage and other reasons,the downstream water is made to contain gas slug segments. To study the parameters impact by the air lock segment in the cleaning,in the process of coupling,consideration is given to the gas slug segment and the movement of the liquid slug segment. The mechanics model of cleaning is built. The results show that the pipeline elevation affects the pig running speed,and the gas slug segment accelerates the pigging speed in the lower areas and slows down at the top of the slop and there is a big change of the pressure of the gas slug segment when the elevation changes.