密封汽流激振下转子动力特性的时域分析

司和勇; 曹丽华; 郭帅; 李盼

doi:10.13700/j.bh.1001-5965.2019.0571

密封汽流激振下转子动力特性的时域分析

doi: 10.13700/j.bh.1001-5965.2019.0571

司和勇¹,
曹丽华^1, ,,
郭帅²,
李盼¹

1.
东北电力大学能源与动力工程学院, 吉林 132012
2.
吉林省电力科学研究院有限公司, 长春 130021

基金项目:

国家自然科学基金 51576036

详细信息

作者简介:
司和勇男, 博士, 讲师。主要研究方向:叶轮机械转子动力学

曹丽华女, 博士, 教授。主要研究方向:汽轮机经济性分析与优化运行

通讯作者:
曹丽华, E-mail: clh320@126.com

中图分类号: TK264
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- 被引次数: 0
出版历程
- 收稿日期: 2019-11-10
- 录用日期: 2020-03-13
- 网络出版日期: 2020-11-20

Time-domain analysis of rotordynamic characteristics with steam flow excited vibration in seal

SI Heyong¹,
CAO Lihua^{1
, ,},
GUO Shuai²,
LI Pan¹

1.
School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China
2.
Jilin Province Electric Power Research Institute Co., Ltd., Changchun 130021, China

Funds:

National Natural Science Foundation of China 51576036

More Information

Corresponding author: CAO Lihua, E-mail: clh320@126.com

摘要

摘要:
针对汽轮机转子偏心导致的汽流激振问题和静偏心模型在转子动力特性研究中的缺陷，采用动网格技术模拟转子真实的三维涡动，在时域上对转子的动力特性进行研究。结果表明：转子涡动时，汽流激振力及其动力系数在时域上随位移呈三角函数变化，且径向力的方向随转子中心位置的变化发生改变。偏心率、涡动速度、自转速度和压比均影响转子动力特性。额定工况下，偏心率每增加10%，径向力与切向力平均增加约25~35 N。随着涡动速度的增大，切向力朝负方向增加，而直接阻尼和交叉阻尼减小。随着压比的增加，径向力增大而切向力减小。在一定范围内，较大的自转速度会使最大激振力的绝对值减小。
- 汽轮机转子 /
- 迷宫密封 /
- 汽流激振 /
- 转子动力特性 /
- 动网格
Abstract:
In order to solve the problem of steam flow excited vibration caused by rotor eccentricity in steam turbine and the defects of static eccentric rotor whirling motion model in rotordynamic characteristics study, the dynamic mesh was adopted to simulate the authentic rotor three-dimensional whirling motion in order to study rotordynamic characteristics in time domain. The results show that the exciting force and the rotordynamic coefficients present the trigonometric function changes while the rotor whirls, and the direction of radial force changes with rotor central position. The rotordynamic characteristics are influenced by the eccentricity, whirling speed, rotational speed and pressure ratio. Under rated condition, the radial force and tangential force increase about 25-35 N averagely with the 10% increase in eccentricity. As the whirling speed increases, the tangential force, direct damping and cross damping decrease. With the increase of pressure ratio, the radial force increases, while tangential force decreases. In a certain range, the absolute value of maximal exciting force decreases when the rotational speed becomes higher.
- steam turbine rotor /
- labyrinth seal /
- steam flow excited vibration /
- rotordynamic characteristics /
- dynamic mesh

HTML全文

图 1 迷宫密封结构参数

Figure 1. Parameters of labyrinth seal structure

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图 2 网格数量对计算结果的影响

Figure 2. Influence of grid quantity on calculation results

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图 3 转子涡动模型示意图

Figure 3. Sketch map of rotor whirling motion model

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图 4 偏心率为10%下不同间隙的汽流激振力变化

Figure 4. Steam flow excited vibration force in different clearance under 10% eccentricity

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图 5 不同偏心率下转子汽流激振力

Figure 5. Rotor steam flow excited vibration force under different eccentricity

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图 6 不同偏心率下转子动力系数

Figure 6. Rotordynamic coefficients under different eccentricity

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图 7 不同涡动速度下转子周向压力分布

Figure 7. Rotor circumferential pressure distribution under different whirling speeds

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图 8 涡动速度对汽流激振力和动力系数的影响

Figure 8. Influence of whirling speed on steam flow excited vibration force and dynamic coefficients

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图 9 流场迹线与湍动能云图

Figure 9. Streamlines and turbulent kinetic energy contours of flow field

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图 10 自转速度对汽流激振力和动力系数的影响

Figure 10. Influence of rotational speed on steam flow excitedvibration force and dynamic coefficients

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图 11 汽流激振力随压比的变化趋势

Figure 11. Change of steam flow excited vibration force with pressure ratio

下载: 全尺寸图片幻灯片

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