水平管气液两相环状流小破口泄漏相分离预测

多相流体通过管壁破口会发生相分离,导致泄漏流体的气液相比例与主管出现差异。为预测水平管环状流泄漏相分离特性,综合考虑了周向液膜分布不均匀影响,建立了不同方位破口相分离特性预测模型。在气液两相流实验环道上进行了泄漏特性实验研究,测量了环状流型下与管底部周向夹角分别为0°、45°、90°的破口泄漏的相分离特性,实验段直径为40mm,破口为圆孔直径2. 5 mm。结果表明,泄漏的气、液相流量与相应的主管气液相流量的比值主要由自破口处的气液相分布决定。在实验范围内模型预测结果与实验值吻合良好。

Phase Split Prediction of Horizontal Gas-liquid Annular Flow through A Small Break

Phase separation may occur when multiphase flow enter a pipe with a break and the gas-liquid ratio of the extracted fluid was different from that of the main pipe. A model was developed to predict the phase splitting characteristics of gas-liquid annular flow through a small break on a pipe wall. Since the circumferential liquid film distribution of horizontal annular flow was considered, the model was capable of predicting the phase splitting phenomena at a small break with arbitrary periphery position. The model assumed leak characteristics were mainly determined by the gas and liquid distribution near the beak. A special leak measurement device was designed and experiments were conducted at a gas-liquid two-phase flow loop. The diameter of the test section was 40 mm and a 2.5 mm diameter hole was used to simulate the actual break. The phase splitting data were measured with circumferential angle at of the break at 0°, 45°, and 90°. Prediction of the model is shown to be in good agreement with the experimental results.