水平管气液环状流在新型分配器中的分配研究

设计了一种新型三通型两相分配器，该分配器主管侧壁均匀分布着直径均为3．5mm的8个小孔，主管中的气液混合物通过安装在主管外壁上的环室进入侧支管．通过在空气一水实验台上对水平管气液环状两相流通过该分配器进行的实验研究发现：与传统三通分配器的分配特性不同，该分配器的液相会优先进入侧支管．建立了相分配模型，认为对于环状流，通过管壁小孔的液膜将被小孔捕获，从而进入侧支管．该模型还提出了分配影响区修正系数，实验发现该系数与入口干度成线性关系．预测的气液相分流系数、主管出口与直通管间压力损失与实验结果吻合得很好，最大误差为7．24％．

Phase Split of Horizontal Gas-Liquid Annular Flow in a Novel Distributor

A new T-junction type distributor which is different from the conventional T-junction was designed. The distributor was composed of eight small holes with a diameter of 3. 5 mm on the pipe wall and a ring casing mounted outside of these holes. The gas-liquid mixture from these small holes will flow through the side arm of the distributor. Experiments were conducted in a horizontal gas-liquid two-phase loop to study the split of annular flow. The results show that the liquid preferentially enters the side arm. In comparison, gas is more easily diverted into the side arm for traditional T-junction. A model was developed to predict the flow splitting characteristics of horizontal air-water annular flow. The model was based on the assumption that the liquid film passing through the small holes would be captured and enter the side arm eventually. Also the coefficient of distribution influence zone in the model is considered to be linearly dependent on the inlet quality. The predictions of the gas extraction ratio, the liquid extraction ratio and the pressure difference between the inlet and run arm agree well with the experimental data.