垂直下水管中气液两相流动特性分析

由于山区水资源空间分布不均,我国边远山区存在结构性缺水的问题。低落差河流环境下液气泵系统是解决该问题的一个有效方案,而垂直下水管及其涉及的气液两相流动特性是其重要的组成部分及关键技术。基于提出的均相流模型和多工况试验数据,对垂直下水管中的气液两相流运动特性进行了进一步研究。重点研究了能够反映垂直下水管中的气液混合程度的关键参数与各个影响因素之间的关系。通过试验结果与解析解的对比,进一步分析并论证了均相流模型存在的不足和试验设计的欠缺之处,为垂直下水管道直径的选取提出了建议。

Kinematic characteristics of the gas-liquid two-phase flow in the vertical downcomer

Uneven distribution of water resources in the Chinese remote mountainous region leads to structural water scarcity. The liquid-gas pump system in low drop river environment is an effective solution to this problem, and the vertical downcomer and its involved kinematic characteristics of the gas-liquid two-phase flow are important parts and key technologies to this system. Based on the data under various conditions and the homogeneous flow model above, kinematic characteristics of the gas-liquid two-phase flow in the vertical downcomer are further studied. It is emphasized on the relationships between several factors and a key parameter which can reflect the mixed degree of air and water in the vertical downcomer. The test results were compared with those of the analytical solutions, then the shortcomings of the model and the defects in the experiments are pointed out. In addition, some references and suggestions on choosing design parameters of the diameters of the vertical downcomer are provided.