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成品油管道低洼处积水引起的腐蚀产物堵塞管道事故严重威胁管道的正常运行,为研究管道中油流携水作用机制,从试验、理论两个角度对油流携水系统的特性进行研究。以柴油和水为介质,在内径27 mm的水平-上倾管流试验系统上对上倾管段0.5 m位置处的出水量以及临界油相流量(出水量不为零时的最小油相流量)进行测量,同时根据试验模型,基于油水两相动量方程和光滑分层流稳定的条件,建立水相厚度梯度的计算模型,对水平测试段中相界面分布进行分析,对出水量以及临界油相流量进行预测。结果表明:新模型能很好地预测两参数的变化;在油流携水系统中,油相处于层流状态时,建立的水相厚度梯度模型能很好地预测相界面分布。
The corrosion products clogging pipelines caused by water accumulation in the oil depressions on the oil depot seriously threaten the normal operation of the pipelines. In order to study the mechanism of oil carrying water in the pipelines, the characteristics of the oil-water carrying system are studied from two aspects of experiment and theory. Using diesel and water as the medium, the water discharge at the 0.5 m upstream of the inclined pipe section and the critical oil phase flow (the minimum oil phase flow when the water output is not zero) were measured on a horizontal-upward pipe flow test system with an inner diameter of 27 mm. Based on the experimental model, a calculation model of thickness gradient of water phase was established based on the two-phase momentum equation and the smooth stratified flow. The distribution of phase interface in horizontal test section was analyzed. Traffic forecast. The results show that the new model can well predict the change of two parameters. In the oil-water carrying system, the phase thickness gradient model established by the oil phase can predict the phase interface well when the oil phase is in the laminar flow state.