贵辛未,牧振伟,夏庆成,李泽发,张治山.混流式水轮机上冠泄排水联合降压数值模拟[J].农业机械学报,2022,53(11):208-214,235.
GUI Xinwei,MU Zhenwei,XIA Qingcheng,LI Zefa,ZHANG Zhishan.Combined Depressurization of Upper Crown Drainage of Francis Turbine Based on CFD[J].Transactions of the Chinese Society for Agricultural Machinery,2022,53(11):208-214,235.
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混流式水轮机上冠泄排水联合降压数值模拟   [下载全文]
Combined Depressurization of Upper Crown Drainage of Francis Turbine Based on CFD   [Download Pdf][in English]
投稿时间:2022-01-22  
DOI:10.6041/j.issn.1000-1298.2022.11.020
中文关键词:  混流式水轮机  泄排水联合降压  轴向水推力  主轴密封  数值模拟
基金项目:新疆维吾尔自治区高校科研计划创新团队项目(XJEDU2017T004)和新疆维吾尔自治区水利工程重点学科项目
作者单位
贵辛未 新疆农业大学 
牧振伟 新疆农业大学 
夏庆成 新疆农业大学 
李泽发 新疆农业大学 
张治山 新疆天富能源股份有限公司 
中文摘要:为研究中高水头混流式水轮机上冠流道内不同降压结构效果及优化可行性,以红山嘴一级水电站4号机为例,将利用UG建立的4类不同上冠流道降压结构模型作为研究对象,基于计算流体动力学(CFD)技术,采用剪切应力传输(SST)湍流模型对4类不同的上冠泄排水结构在7种流量下展开数值模拟,计算工况共计28种。研究指标为泄漏水流态分布特性、主轴密封下侧压力、上冠轴向水推力、梳齿环密封性能。结果表明:不同泄排水降压结构内的泄漏水流态存在一定差异;为改善水轮机主轴密封性能可采取含转轮泵的联合泄排水降压结构,该结构相比其他结构对降低主轴密封压力、降低上冠轴向水推力、减少上冠间隙泄漏量均有显著效果;调整转轮泵降压结构的泵叶或泵盖几何参数可达到优化目的;针对该电站主轴密封漏水问题,采取含转轮泵的联合泄排水降压结构可使主轴密封下侧压力平均降低15.98%左右、上冠轴向水推力平均降低52.99%左右,大大提高电站运行效率。该研究在传统的单一泄排水降压结构基础上增设了转轮泵,为中高水头混流式水轮机获得最佳综合效益及其改造优化提供了参考依据。
GUI Xinwei  MU Zhenwei  XIA Qingcheng  LI Zefa  ZHANG Zhishan
Xinjiang Agricultural University; Xinjiang Tianfu Energy Co., Ltd.
Key Words:Francis turbine  combined depressurization of water drainage  axial water thrust  main shaft seal  numerical simulation
Abstract:In order to study the effect and optimization feasibility of different pressure-reducing structures in the upper crown flow channel of medium and high head Francis turbines, taking the No. 4 unit of Hongshanzui First-Stage Hydropower Station as an example, four different depressurization structure models of upper crown channel established by UG were taken as the research object. Based on computational fluid dynamics(CFD)technology, shear stress transport (SST) turbulence model was used to simulate a total of 28 calculation conditions of four different upper crown drainage structures under seven flow rates. The research indicators were the flow distribution characteristics of leakage water, the lower side pressure of main shaft seal, the axial water thrust of the upper crown and the sealing performance of the comb ring. The results showed that there were some differences in the leakage water flow regime in different drainage and depressurization structures. In order to improve the sealing performance of the turbine main shaft, a combined drainage and depressurization structure with a runner pump can be adopted. Compared with other structures, this structure had significant effects on reducing the main shaft sealing pressure, the axial water thrust of upper crown and the leakage of upper crown clearance. Adjusting the geometric parameters of the pump blades or pump cover of the pressure-reducing structure of the runner pump can achieve the optimization purpose. In view of the leakage problem of the main shaft seal of the power station, the combined drainage and pressure reduction structure with runner pump can reduce the lower side pressure of the main shaft seal by about 15.98% on average and the axial water thrust of the upper crown by about 52.99% on average, which can greatly improve the operation efficiency of the power station. A runner pump was added on the basis of the traditional single drainage and pressure-reduction structure, which provided a reference for obtaining the best comprehensive benefit and its transformation and optimization of a medium-high head Francis turbine.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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