轴流式水轮机增效扩容出力不足原因及优化

详细信息    查看全文 | 推荐本文 |

英文篇名：Cause of insufficient output of axial flow turbine after capacity expansion and efficiency improvement and corresponding optimization 作者：柳海鹏 ; 陈柱 英文作者：LIU Hai-peng;CHEN Zhu;Xinjiang Wuluwati Hydropower Project Construction Management Bureau;Chongqing Water Turbine Works Co., Ltd.; 关键词：增效扩容 ; 轴流定桨式水轮机 ; 贯流式转轮 ; 试运行 ; 桨叶转角 ; 叶片修型 ; 顶盖补气 ; 数值模拟 英文关键词：Capacity expansion and efficiency improvement;;Nagler turbine;;Tubular turbine runner;;Trial operation;;Blade angle;;Blade repair;;Air admission through top cover;;Numerical simulation 中文刊名：SDJD 英文刊名：Mechanical & Electrical Technique of Hydropower Station 机构：新疆乌鲁瓦提水利枢纽管理局;重庆水轮机厂有限责任公司; 出版日期：2019-06-15 出版单位：水电站机电技术 年：2019 期：v.42;No.222 语种：中文; 页：SDJD201906002 页数：4 CN：06 ISSN：11-5130/TV 分类号：7-9+74

摘要

国内某电站将贯流式转轮更换为轴流定桨式水轮机的增效扩容项目,试运行时发现机组出力达不到预期要求。通过分析该贯流式转轮模型资料以及该电站水轮机流道图纸资料,结合现场试运行情况,提出加大桨叶转角以增大流量进而增加出力的初步方案。随后运用相关CFD软件进行数值模拟,发现除原桨叶转角偏小外,叶片出水边与轮缘交界处的局部形状亦是影响机组出力的主要因素,进而确定了水轮机出力不足的原因,并提出了改进方案。现场试运行表明,机组各项主要性能参数良好,满足技术协议要求,水轮机出力不足问题得到了解决。与此同时,该改进措施及CFD计算方法可为同类型水轮机同类问题的解决提供参考。
        For the purpose of capacity expansion and efficiency improvement of XXX Hydropower Station in China, a tubular turbine runner is installed to the Nagler turbine, while it is found that the unit fails to reach the expected output during trial operation. Through analysis on data of the tubular turbine runner model and drawings of turbine flow passage of the hydropower station, and considering field trial operation conditions, a preliminary scheme of increasing the blade angle to increase the flow and thus increase the output is proposed. Through subsequent numerical simulation using relevant CFD software, it is found that besides the small blade angle, the local shape at the junction of the blade outlet edge and the rim is also a main factor affecting the unit output. On this basis, the cause of insufficient output of turbine is further ascertained and a corresponding improvement scheme is put forward. Field trial operation shows that the main performance parameters of the unit are good and meet the requirements of the technical agreement, indicating that the insufficient output problem of turbine is solved. Meanwhile, the improvement measure and CFD calculation method can provide reference for solving problems of the same type encountered by turbines of the same time.

引文

[1]李仲德,张立勇.古尔图七级水电站1号机顶盖补气解决水轮机振动的分析与处理[J].小水电,2017(3):71-74.
    [2]桂亚琴,肖文燕,陈柱,等.南津驿水电站水轮机增容改造[J].广西水利水电,2013(2):73-75.
    [3]张慧珍,卢磊.基于CFD的低水头轴流式水轮机转轮增容改造研究[J].水力发电,2018(5):65-68.
    [4]李志华.轴流转桨式水轮机过流部件的匹配和数值模拟[D].西安:西安理工大学,2010.
    [5]廖伟丽,赵亚萍,赵倩云,等.不完全蜗壳轴流式水轮机大流量工况性能分析[J].农业工程学报,2014(17):86-92.