摘要
为研究混流式水轮机主轴密封泵板装置工作特性及优化可行性,基于CFD商用软件,以新疆红山嘴一级电站4号机为例对其结构进行改进。在模型准确基础上,分别就径向泵叶角度、泵盖高度做改进,并将泵叶和泵盖联合改进结构进行数值模拟。共计25种计算模型,225种工况,以泵盖排水量、梳齿环出口压力、顶盖排水压力作为指标,探究提高泵板装置工作效率及主观减少间隙泄漏量的可行性。研究表明:泵盖位置较泵叶角度改变对优化效果更佳;较大高度比的泵盖对减少间隙泄漏量、提高泵板装置工作效率更有利;径向泵叶且高度比为0.1902为最佳改进结构,可使泵板装置工作效率提高11.7%、泄漏量减少17.8%、顶盖排水量增加14.5%。
In order to study the working characteristics and optimization feasibility of the pump plate device of the Francis turbine on shaft seal,the No.4 turbine of Hongshanzui Power Station I in Xinjiang is investigated with CFD commercial software to improve its structure.Based on the accurate model,the radial pump blade angle and the pump cover height are improved respectively.The jointly improved structure of the pump blades and the pump cover is numerically simulated.In a total of 25 calculation models and 225 working conditions,the displacement of the pump cover,the outlet pressure of the comb ring and the drainage pressure of the top cover are taken as indicators to explore the feasibility of improving the working efficiency of the pump plate device and reducing clearance leakage.The results show that the optimization of the pump cover position is better than that of the pump blade angle;the pump cover with a larger height ratio is more advantageous for reducing the clearance leakage and improving the working efficiency of the pump plate device;the radial pump blades with the height ratio of 0.1902 as the best improved structure can improve the working efficiency of the pump plate device by 11.7%,reduce the leakage by 17.8%and increase the displacement of the top cover by 14.5%.
作者
贵辛未
牧振伟
夏庆成
张治山
GUI Xin-wei;MU Zhen-wei;XIA Qing-cheng;ZHANG Zhi-shan(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Hongshanzui Hydropower Station,Xinjiang Tianfu Energy Co.Ltd.,Shihezi 832000,China)
出处
《热能动力工程》
CAS
CSCD
北大核心
2020年第7期49-57,共9页
Journal of Engineering for Thermal Energy and Power
基金
新疆维吾尔自治区高校科研计划创新团队项目(XJEDU2017T004)
新疆维吾尔自治区水利工程重点学科资助项目。
关键词
泵板装置
结构改进
高度比
泄漏量
效率
pump plate device
structural improvement
height ratio
leakage
efficiency
