Theoretical Solutions for Dynamic Characteristics of Spiral-Grooved Liquid Seals
Theoretical Solutions for Dynamic Characteristics of Spiral-Grooved Liquid Seals
复制标题
螺旋槽液体密封动态特性的理论解
DOI：
10.1080/10402004.2018.1463427
复制
发表时间：
2018-11
影响因子：
2.1
通讯作者：
Cui Baoling
中科院分区：
文献类型：
--
作者：
Zhai Lulu;Zhu Zuchao;Zhang Zhenjie;Guo Jia;Cui Baoling
环形密封是控制高速离心泵，特别是多级离心泵泄漏的解决方案之一。本文在Iwatsubo和查尔兹理论的基础上，提出了螺旋槽液体密封泄漏量和动态特性的理论分析方法。首先用密封内流体的惯性项计算出稳态速度和泄漏率。随后，分别建立了包括轴向动量方程、周向动量方程和连续性方程的槽脊部分和凹槽部分的控制方程。通过求解一阶控制方程，建立了考虑周向速度扰动随轴向位置变化的转子动力特性的求解方法。实验泄漏率和理论预测之间的详细比较显示出良好的一致性。此外，所提出的方法预测的动态系数进行了比较的理论和实验结果的岩坪。计算结果表明，该方法的计算结果与实验结果吻合较好，误差小于35%，验证了本文提出的分析方法的正确性。刚度和阻尼系数的预测精度相比，岩坪提出的解决方案的方法的精度有很大的提高。
ABSTRACT Annular seals represent one of the solutions for controlling leakage in high-speed turbomachinery, especially in multistage centrifugal pumps. In this article, a theoretical analysis method for leakage rate and dynamic characteristics of spiral-grooved liquid seals based on the theory of Iwatsubo and Childs is proposed. Steady-state velocities and leakage rate are figured out first with the inertia term of the fluid within the seals. Subsequently, governing equations for the land part and the groove part including the axial momentum equation, circumferential momentum equation, and continuity equation are respectively built. A solution method for calculating the rotordynamic characteristics that has taken account of the circumferential velocity perturbation change with the axial location is developed by solving the first-order governing equations. Detailed comparisons between the experimental leakage rates and theoretical predictions show good agreement. Moreover, dynamic coefficients predicted by the proposed method are compared with the theoretical and experimental results of Iwatsubo. The results show that the predicted stiffness of the present solution method correlates well with the experimental evidence with an error of less than 35% in the given examples, which validates the analysis method developed in this article. The predicted accuracy of stiffness and damping coefficients has improved substantially compared to the accuracy of the solution method proposed by Iwatsubo.
登录
查看更多内容
利用瞬态 CFD 和周期圆轨道模型研究孔型密封件的转子动力学特性
DOI：
10.1115/1.4003403
发表时间：
2011-08
期刊：
ASME Journal of Vibration and Acoustics
影响因子：
--
作者：
Xin YAN;Jun LI;Zhenping FENG
通讯作者：
Zhenping FENG
影响因子：
--
作者：
T. Iwatsubo;B. Sheng;M. Ono
通讯作者：
T. Iwatsubo;B. Sheng;M. Ono
DOI：
--
发表时间：
1967
期刊：
--
影响因子：
--
作者：
R. Hale;W. K. Stair
通讯作者：
R. Hale;W. K. Stair
DOI：
10.1115/1.3451407
发表时间：
1970-04
期刊：
Journal of Lubrication Technology
影响因子：
--
作者：
C. Chow;J. Vohr
通讯作者：
C. Chow;J. Vohr
DOI：
10.1115/1.3254636
发表时间：
1983-01-01
期刊：
JOURNAL OF LUBRICATION TECHNOLOGY-TRANSACTIONS OF THE ASME
影响因子：
--
作者：
CHILDS, DW
通讯作者：
CHILDS, DW