负载力矩对管路涡轮内流影响的数值预测  

NUMERICAL PREDICTION OF LOAD MOMENT'S EFFECT ON THE INTERNAL FLOW OF HYDRAULIC TURBINE IN PIPELINE

作　　者：王乐勤[1] 林思达[1] 王循明[1,2] 焦磊[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]浙江机电职业技术学院,浙江杭州310053

出　　处：《工程热物理学报》2009年第1期69-72,共4页Journal of Engineering Thermophysics

基　　金：浙江省自然科学基金项目资助(No．Y107467);浙江省科技计划项目资助(No．2008C31026)

摘　　要：为考察管路液力涡轮的水力特性,采用修正k-ε模型对四种负载力矩条件下的管路液力涡轮进行全流道三维湍流数值模拟。分析了管路涡轮叶片表面、叶片间流道和转轮后部的尾流流动,讨论了输出转速以及涡轮水力效率的变化特性及其与内部流动特征的关系,并与试验结果进行了比较。结果表明,设计额定负载下涡轮叶片表面压力梯度分布合理,转轮内流动及尾流流态较好,水力效率最高,高负载条件下转轮内出现较大的叶尖涡和尾流分离涡,水力效率也很低。To investigate the hydraulic performance of hydraulic turbine in pipeline, the RNG κ-ε turbulent model was applied to numerical simulation on the tridimensional turbulent flow in whole flow passage of pipeline hydraulic turbine under four different load moment. The internal flow on vane surface, between adjacent vanes and behind the rotary boss wase analyzed. The change characteristic of the turbine output rotational speed and hydraulic efficiency under different internal flow characteristic were described. Comparing numerical simulation with experiment results, the results show that the pipeline turbine has peak efficiency at the point of design load moment because of the good flow pattern and appropriate pressure grads on vanes＇ surface. With the occurrence of large tip turbine and separation eddy, the pipeline turbine has low efficiency at the points of overload moment.

关 键 词：管路涡轮 负载力矩 水力性能 修正κ-ε模型 

分 类 号：TE248[石油与天然气工程—油气井工程]