排灌机械工程学报2012，Vol.30Issue(6)：641-645,5.DOI:10.3969/j.issn.1674-8530.2012.06.005
高含气率下增强叶轮内气液均匀混合的方法
Methods for improving gas and liquid phases mixing in impeller with high gas void fraction
摘要
Abstract
To solve the problems, such as gas-liquid separation in the impeller of a rotodynamie multiphase pump under high gas void fractions (GVF) and subsequent reduction in the pump performance, several methods for breaking gas packets to inhibit gas-liquid separation and enhance the mixing between two phases were presented, including implanting short blades, using T-shaped blades, and o-pening holes on the blades where gas packets appear. Then, under the rated condition, the flow fields in three amended impellers were simulated under the GVFs of 60% and 80% , respectively, by means of CFD code-Fluent. The results show that the streamlines are more evenly distributed in all the amended impellers than those in the original one, the degree of mixing of two phases is improved greatly. Additionally, the local highest GVF in all the amended impellers is not only lower than that in the original impeller, but the GVF distribution in them is more uniform. Besides, a comparison of total pressure head rise across the original impeller and the amended ones was made. It was showed that the total pressure rise of the amended impellers is similar to the original one under low GVFs, but it is larger in high GVFs. The amended impeller with opening holes exhibits the highest head rise, which is even better than that of the original impeller, suggesting the means of opening holes not only enhances the a-bility of mixing of two-phase but also prevent extra hydraulic losses furthest.关键词
油气混输泵/叶轮/含气率/气囊/气液混合Key words
oil-gas multiphase pump/impeller/gas void fraction/gas pocket/gas-liquid mixing分类
农业科技引用本文复制引用
张金亚,朱宏武,徐丙贵,丁矿,强睿..高含气率下增强叶轮内气液均匀混合的方法[J].排灌机械工程学报,2012,30(6):641-645,5.基金项目
国家自然科学基金资助项目(51209217) （51209217）
中国博士后科学基金面上资助项目 (2011M500490) （2011M500490）
