Study on S-shaped characteristic of Francis reversible unit by on-site test and CFD simulation

来源 :Science China(Technological Sciences) | 被引量 : 0次 | 上传用户:a15few512
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The operation parameters (vibration, shaft displacement and pressure fluctuation) of No. 1 Francis reversible unit of Baoquan pumped-storage power station were measured on site in the no-load mode at net heads of 518.04, 522.01 and 530.38 m, respectively. The rotational speed fluctuations in the no-load mode at three net heads were beyond synchronization requirement with obvious S-shaped characteristic, and misaligned guide vanes (MGV) had to be put into use for synchronization. Further analysis demonstrated that the rotating frequency signal was generally dominant in vibration and shaft displacement mixing signal in the no-load mode, while the frequency domain was wide without an obvious main frequency in pressure fluctuation mixing signal. Besides, the SST k-ω turbulence model was adopted to simulate the four quadrant characteristic curves of Baoquan model pump-turbine at three gate openings, and the relative error between simulation results and model test data was within ±6%, indicating that the simulation method in this paper is feasible and S-shaped characteristic of the pump-turbine can be simulated with CFD method. The operation parameters (vibration, shaft displacement and pressure fluctuation) of No. 1 Francis reversible unit of Baoquan pumped-storage power station were measured on site in the no-load mode at net heads of 518.04, 522.01 and 530.38 m, respectively. rotational speed fluctuations in the no-load mode at three net heads were beyond synchronization requirement with obvious S-shaped characteristic, and misaligned guide vanes (MGV) had to be put into use for synchronization. Further analysis demonstrated that the rotating frequency signal was generally In addition, the SST k-ω turbulence model was adapted to simulate the four quadrant characteristic curves of Baoquan model pump-turbine at three gate openings, and the relative error between simulation results and model test data was within ± 6%, indi cating that the simulation method in this paper is feasible and S-shaped characteristic of the pump-turbine can be simulated with CFD method.
其他文献
粘多糖病(mucopolysaccharidosis,MPS),为一种以粘多糖代谢障碍为特点的遗传性疾患,可以引起骨骼、内脏和智力上的异常,临床少见。作者收集1970~1999年衡阳市中心医院、衡阳医学院第二附属医院、核工业
2004年6月3—8日,由中国图书馆学会主办、北京市西城区图书馆协办的“图书馆现代化管理馆长研修班”在北京市西城区图书馆报告厅举办,来自全国各图书馆的40多位馆长参加了本
随着腹腔镜技术的不断提高和应用范围的不断拓展,这一新技术也开始应用于人工阴道成型术.自2003年1月至2004年2月,我院共收治先天性无子宫、无阴道患者9例,均行腹腔镜下盆腔腹膜移植阴道成型术,现报道如下。
在桥本氏甲状腺炎中 ,甲状腺组织中存在着细胞凋亡现象。大量研究关注Fas、FasL介导的细胞凋亡在桥本氏甲状腺炎中的作用 ,本文拟就此作一综述。 In Hashimoto’s thyroidit
随着社会老龄化和 2型糖尿病 (DM )发病率的逐年增高 ,防治骨质疏松症 (OP)对于DM患者有着重要意义 ,因此本研究对 112例DM的骨密度 (BMD)进行测定 ,以探讨DM和OP的关系。一、对象与方法1.对
2012年12月29日,国务院印发了《生物产业发展规划》,这是继《促进生物产业加快发展的若干政策》和《生物产业发展“十一五”规划》以来对生物产业的又一重大利好政策。近年来
1、发挥图书馆的特有优势。图书馆的教育功能至今还有些模糊,其主要原因是图书馆的广义教育性受到广泛的重视,人们忽略了其狭义教育职能。但在今天,由于信息生产力通过信息化
在过去的几年中,已经有诸多关于移动设备和个人设备行业的爆炸性增长的讨论了。事实上,预计全球手机营收将达到价值约1.6万亿美元;但即使如此的规模,较之美国医疗保健行业约3万亿美元的预计增长来说,仍可谓是相形见绌。而这两大行业的并行发展,使得“自带办公设备”(BYOD)的趋势在整个医疗保健机构越来越流行。  然而,医疗保险和医疗补助服务中心(CMS)在去年出台的第二阶段合规性指南介绍中重点强调在医疗卫
近两年,广西餐饮界杀出了一匹黑马——桂林仔家味饮业有限公司。这个以经营桂林风味家常菜为主的餐饮企业在不到两年的时间里,就在桂林、南宁、柳州开了10家连锁店,而且个个
北京的四大金字招牌 在北京什刹海西边,就是著名“胡同游”的大本营。一辆辆印有中、英文“到胡同去”字样、黑漆车身、红色顶棚的三轮车和身着黄马甲、足蹬青布圆口鞋的车