摘要
针对微水头双向灯泡贯流式水轮机叶片翼型和形状对其性能的影响,在相同设计水头下,对3种叶片的微水头双向贯流式水轮机进行了CFD数值模拟,对比分析了正反向工况下3种叶片的水轮机的外特性(流量、效率、出力)、叶片表面静压分布和相对流速矢量分布,最终确定了叶片C为较优叶片,进而分析了较优水轮机模型下的各部分水头损失以及内部流场规律。结果表明,正向工况下由于灯泡体后置,使得出水流道内出现回流、漩涡等不良流态,增加了撞击损失,故正向工况的效率低于反向工况。
According to the influence of blade shapes and blade airfoil on the performance of the micro-head bidirectional tubular turbine,numerical calculations based on CFD were carried out to simulate its three-dimensional turbulent flow with three blades in different shapes by setting the same design head.Compared the discharge,output,efficiency of three approaches in obverse and reverse working condition,the better scheme on the shape of blades was finally determined by analyzing static pressure distribution and relative velocity distribution of the surfaces of three different blades contrastively.And then the water head loss of the optimal model and the rule of its inner flow field are analyzed.The results show that the phenomena of vortex and circumfluence appeared in outflow channel due to the post-posed bulb in positive condition,which increased the hydraulic loss.Therefore,it leads to much lower efficiency in positive direction compared with negative direction.
出处
《水电能源科学》
北大核心
2014年第11期150-154,共5页
Water Resources and Power
基金
国家自然科学基金项目(51106042)
关键词
双向水轮机
微水头
数值模拟
叶片比选
整机性能
bidirectional water turbine
micro head
numerical simulation
blade comparison and selection
turbine performance
