中国农村水利水电
中國農村水利水電
중국농촌수이수전
CHINA RURAL WATER AND HYDROPOWER
2015年
6期
162-165
,共4页
混流式水轮机%内部流动%尾水管%涡带
混流式水輪機%內部流動%尾水管%渦帶
혼류식수륜궤%내부류동%미수관%와대
francis turbine%inner flow%draft tube%vortex strip
为探讨长短式叶片混流式水轮机的内部流动规律，基于CFD性能预测方法，采用SIMPLE算法和RNG k-ε模型，计算水轮机在不同工况下的速度－压力分布，探讨水轮机内部流场的速度分布、压力分布、尾水管涡带和压力脉动情况。研究结果表明：蜗壳内流体流动较为规律，当蜗壳内流体旋转至转轮进口处时，蜗壳内的流体排泄可能迟滞，流动复杂。导叶开度增加后，尾水管旋涡区向下移动，强度增大，且对扩散段流态造成影响。在部分工况下能很好地捕捉到真实最大压力脉动信息。研究可为深入了解水轮机激振的内在机理、改善水轮机的综合性能提供一定参考。
為探討長短式葉片混流式水輪機的內部流動規律，基于CFD性能預測方法，採用SIMPLE算法和RNG k-ε模型，計算水輪機在不同工況下的速度－壓力分佈，探討水輪機內部流場的速度分佈、壓力分佈、尾水管渦帶和壓力脈動情況。研究結果錶明：蝸殼內流體流動較為規律，噹蝸殼內流體鏇轉至轉輪進口處時，蝸殼內的流體排洩可能遲滯，流動複雜。導葉開度增加後，尾水管鏇渦區嚮下移動，彊度增大，且對擴散段流態造成影響。在部分工況下能很好地捕捉到真實最大壓力脈動信息。研究可為深入瞭解水輪機激振的內在機理、改善水輪機的綜閤性能提供一定參攷。
위탐토장단식협편혼류식수륜궤적내부류동규률，기우CFD성능예측방법，채용SIMPLE산법화RNG k-ε모형，계산수륜궤재불동공황하적속도－압력분포，탐토수륜궤내부류장적속도분포、압력분포、미수관와대화압력맥동정황。연구결과표명：와각내류체류동교위규률，당와각내류체선전지전륜진구처시，와각내적류체배설가능지체，류동복잡。도협개도증가후，미수관선와구향하이동，강도증대，차대확산단류태조성영향。재부분공황하능흔호지포착도진실최대압력맥동신식。연구가위심입료해수륜궤격진적내재궤리、개선수륜궤적종합성능제공일정삼고。
To further study the internal flow mechanism of Francis turbine with long-short blade ,this paper calculates the velocity-pressure distributions of turbine under different operating conditions based on CFD predicting theory ,k-εmodel and SIM PLEC algo‐rithm to inquire into the velocity distributions ,pressure distributions ,draft tube vortex and pressure pulsations .As the research re‐sult shows that fluid flow in volute is uniform ,the flow in volute and runner junction is complex .With guide vane opening increas‐ing ,draft tube vortex region moves downwards ,the strength increase ,and the impact on diffusion section flow .Under some condi‐tions ,the pressure pulsation information can be captured accurately .This study can provide a reference for the understanding of intrinsic vi‐brating mechanism of hydro-turbine due to excitation by the flows ,and the improvment of comprehensive hydraulic performance .
