全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

混流式水轮机跨尺度流道内复杂湍流的数值模拟

, PP. 132-138

Keywords: 大涡模拟,Vreman亚格子模型,湍流,水轮机,梳齿密封

Full-Text   Cite this paper   Add to My Lib

Abstract:

由于水轮机主流道和密封间隙流道空间尺度相差较大,为同时获得水轮机流道和密封通道内的流动特性以及水封间隙泄漏特性,充分考虑叶道流和间隙流的相互干扰,采用非一致网格界面插值技术以及基于Vreman亚格子模型的全局动态大涡模拟方法,不仅得到主流道内速度、压力以及涡量的分布,同时捕捉到了微通道间隙内的流动特征以及不同间隙宽度对密封渗漏流动特性及顶盖压力分布的影响。计算结果表明,主叶道内的强旋拧涡带,密封间隙内旋涡结构以及尾水涡带都直接影响转轮的动态平衡,流体从间隙进入梳齿空腔后产生很强的旋涡而耗散部分动能,而且不同尺度密封间隙流道内产生的旋涡结构不同,耗散能量差异较大,反映出密封渗漏流量的不同。

References

[1]  Keck H,Sick M. Thirty years of numerical flow simulation in hydraulic turbomachines[J]. Acta Mechanics, 2008,201(1-4):211-229.
[2]  钱忠东,郑彪,杨建东,等. 水轮机补气条件下压力脉动的数值分析[J]. 水力发电学报, 2008,27(4):126-134. Qian Zhongdong,Zheng Biao,Yang Jiandong,et al.Numerical simulation and analysis of pressure pulsation in Francis hydraulic turbine with air admission[J].Journal of Hydroelectric Engineering,2008,27(4)
[3]  Wang Wenquan,Zhang Lixiang,Guo Yakun. Turbulent flow simulation using LES with dynamical mixed one-equation subgrid models in complex geometries[J]. International Journal for Numerical Methods in Fluids, 2010,63(5):600-621.
[4]  吴玉林,吴晓晶,刘树红. 水轮机内部涡流与尾水管压力脉动相关性分析[J]. 水力发电学报, 2007,26(5):123-127. Wu Yulin,Wu Xiaojing,Liu Shuhong.Correlation analysis of the internal vortex flow of hydro turbine with the pressure fluctuation inside draft tube[J].Journal of Hydroelectric Engineering,2007,26(5)
[5]  Wang Wenquan,Zhang Lixiang,Yan Yan,et al. Large-eddy simulation of turbulent flow considering inflow wakes in a Francis turbine blade passage[J]. Journal of Hydrodynamics, 2007,19(2):201-209.
[6]  祁明旭,丰镇平. 透平动叶顶部间隙流端壁二次流结构研究. 西安交通大学学报, 2005,39(5):445-449. Qi Mingxu,Feng Zhenping.Study on tip clearance flow of turbine blade-endwall secondary flow structure[J].Journal of Xi?an Jiaotong University,2005,39(5)
[7]  贾希诚,王正明,蔡睿贤. 叶轮机械中叶顶间隙形态对气动性能影响的数值研究[J]. 工程热物理学报, 2001,22(4):431-434. Jia Xicheng,Wang Zhengming,Cai Ruixian.Numerical investigation of the effects of tip gap shapes on aerodynamic performance in turbomachinery[J].Journal of Engineering Thermophysics,2001,17(4)
[8]  张靖煊,林峰,陈静宜,等. 旋转进口畸变条件下轴流压气机叶顶间隙流非定常特征及其与旋转失速的关联性研究[J]. 工程热物理学报, 2008,29(3):390-394. Zhang Jingxuan,Lin Feng,Chen Jingyi,et al.The unsteady features and role of tip clearance flow in distortion induced instability in an axial compressor[J].Journal of Engineering Thermophysics,2008,29(3)
[9]  Borello D,Hanjalic K,Rispoli F. Computation of tip-leakage flow in a linear compressor cascade with a second-moment turbulence closure[J]. International Journal of Heat and Fluid Flow, 2007(28):587-601.
[10]  吴钢,张克危,戴勇峰. 转轮间隙及密封结构对混流式水电机组安全运行的影响[J]. 大电机技术, 2005(1):44-52. Wu Gang,Zhang Kewei,Dai Yongfeng.Influences of the runner gap and seal construction on the safety in operation of Francis water power sets[J].Large Motor Technology,2005(1)
[11]  戴勇峰,壬海,张克危,等. 混流可逆式转轮密封装置的泄漏量及其对机组运行的影响[J]. 水力发电学报, 2005,24(2):100-104. Dai Yongfeng,Wang Hai,Zhang Kewei,et al.Analysis of the leakage of the Francis pump-turbine runner?s sealing device and its effect on operation of the set[J].Journal of Hydroelectric Engineering,2005,24(2)
[12]  梁武科,董彦同,赵道利,等. 混流式水轮机减压管对密封间隙及其周围流场的影响[J]. 水力发电学报, 2008,28(2):135-140. Liang Wuke,Dong Yantong,Zhao Daoli,et al.The influence of relief pipes of Francis hydraulic turbine on the flow field of the sealing clearance and its envirous[J].Journal of Hydroelectric Engineering,2008,28(2)
[13]  Nezym V. A statistical model for the effect of casing treatment recesses on compressor rotor performance[J]. Experimental Thermal and Fluid Science, 2007,31(8):1165-1176.
[14]  Deng Q H,Niu J F,Feng Z P. Study on leakage flow characteristics of radial inflow turbines at rotor tip clearance[J]. Science in China Series E:Technological Sciences, 2008,51(8):1125-1136.
[15]  Li W,Qiao W Y,Xu K F,et al. Numerical simulation of tip clearance flow passive control in axial turbine[J]. Journal of Thermal Science, 2008,17(2):147-155.
[16]  Vreman A W. An eddy-viscosity subgrid-scale model for turbulent shear flow:algebraic theory and applications[J]. Physics of Fluids, 2004,16(10):3670.
[17]  You D,Moin P. A dynamic global-coefficient subgrid- scale eddyviscosity model for large-eddy simulation in complex geometries[J]. Physics of Fluids, 2007(19):169-182.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133