管内油气两相流流量变化瞬态过程研究

为了给油气两相流管线的设计和运行的安全性提供参考依据，并为油气两相流瞬态模型研究提供检验数据，对流量改变引起的油气两相流瞬态过程进行了详细实验研究．实验系统的管路采用管径为２９ｍｍ，总长为１８ｍ的有机玻璃管道，由水平段、垂直上升段和垂直下降段三种管道布置组成；实验工质为３０＃机油和空气．在垂直下降段、水平段和垂直上升段设置测量段，测量压力、压降、含液率和流型；用微机数据采集系统实现自动连续采集，能得到流动参数快速变化的详细信息．该系统可同时采集１６路信号，采集频率为１ｋＨｚ．实验发现，增加气相流量时压力会陡然增加，超过最后的稳态值，出口流量也会出现瞬间峰值，增加液相流量和分别减小两相流量的操作不会引起超越稳态值的问题，因此在油气两相流管线的设计和运行操作时应考虑气相流量增加过程中出现的极大值超越稳态设计值所带来的技术问题．

A Study on the Instantaneous State Process of Pipeline Oil gas Two Phase Flow

In order to provide the bases for the design and the operation of oil gas two phase flow pipelines and for the study of oil gas two phase flow instantaneous model,the instantaneous state process of oil gas two phase flow caused by the change of flow rate is studied in detail with experiment.The pipeline used in the experiment is composed of vertically upward,vertically downward and horizontal segments.Its length is 18m,diameter 29mm,and material is organic glass.The working medium used in the experiment is 30 # lubricating oil and air.The data of pressure,pressure drop,oil content and flow type of each segment is gathered with a computer,which can gather 16 channels at a frequency of 1kHz at the same time.The experimental result shows that increasing the flow rate of air leads to the sharp increase of pressure,and when the pressure exceeds the steady state value,the exit flow rate reaches instantaneous speak value ,which should be taken into consideration in the process of the design and the operation of oil gas two phase flow pipelines.But increasing the flow rate of oil and decreasing the flow rates of two phase respectively does not lead to surpassing steady values.