Full Text:   <184>

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CLC number: TE965; TK172

On-line Access: 2019-08-05

Received: 2019-05-01

Revision Accepted: 2019-06-27

Crosschecked: 2019-07-08

Cited: 0

Clicked: 248

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Bao-qing Liu

https://orcid.org/0000-0002-3393-1309

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.8 P.577-589

10.1631/jzus.A1900129


Design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow


Author(s):  Ning Sun, Rui-jia Cheng, Ya-nan Zhang, Bao-qing Liu, Bengt Sunden

Affiliation(s):  College of Energy Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   baoqingliu@zju.edu.cn, Bengt.sunden@energy.lth.se

Key Words:  Tube bundle, Fluid-elastic instability, Two-phase cross flow, Design guidelines


Ning Sun, Rui-jia Cheng, Ya-nan Zhang, Bao-qing Liu, Bengt Sunden. Design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow[J]. Journal of Zhejiang University Science A, 2019, 20(8): 577-589.

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author="Ning Sun, Rui-jia Cheng, Ya-nan Zhang, Bao-qing Liu, Bengt Sunden",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900129"
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%T Design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow
%A Ning Sun
%A Rui-jia Cheng
%A Ya-nan Zhang
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900129

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T1 - Design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow
A1 - Ning Sun
A1 - Rui-jia Cheng
A1 - Ya-nan Zhang
A1 - Bao-qing Liu
A1 - Bengt Sunden
J0 - Journal of Zhejiang University Science A
VL - 20
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1900129


Abstract: 
fluid-elastic instability of tube bundles is the main cause of vibration failure of heat exchangers. To establish more reasonable and reliable design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow, we investigated experimentally the effects of the flow conditions of the two-phase flow and the geometrical characteristics of the tube bundles on damping, vibration, and fluid-elastic instability. Moreover, we proposed recommended values of the instability constant based on the conductivity difference measurement (CDM) model and the classification of tube bundle arrangements. The reliability of these values was also verified. The results indicated that the damping ratio in the lift direction was smaller than that in the drag direction and fluid-elastic instability was more prone to occur. The order of stability of the four tube bundle arrangements from high to low was normal triangular, normal square, rotated square, and rotated triangular. Thus, to avoid fluid-elastic instability, the normal triangular tube bundle is recommended for large shell-and-tube heat exchangers subjected to two-phase cross flow. In addition, for normal square and normal triangular tube bundles, the recommended instability constant is 4.0. For rotated square and rotated triangular tube bundles, the recommended instability constant is 1.1 when the mass damping parameter is less than or equal to 0.54, otherwise the value is 1.5.

The paper considers the stability of a flexible cantilevered pipe which is hanging vertically with an internal flow into a large tank. This flow is forced out of the tank, upwards through a concentric rigid annulus around the pipe. Thus the internal and external flow velocities are in opposite directions and related by mass continuity. Parametric studies are carried out for 2 pipes with varying lengths exposed to the external flow and varying annular gaps. A theoretical model is developed, the analysis is rigorous and thorough, and the results and compared with experimental results. The nonlinear model is novel, the theoretical predictions generally agree very well with experiments, and the presentation is a model for clarity. This is excellent work.

两相横向流中管束弹性不稳定性的设计准则

目的:流体弹性不稳定性是引起换热器管束振动失效的最主要原因. 鉴于目前有关两相横向流诱发管束弹性不稳定性的设计准则尚无一致结论,本文采用空气-水两相流体系,考察不同参数条件下换热器管束的弹性不稳定性.
创新点:1. 从避免发生弹性不稳定性的角度,确定适宜的管束排列方式和节径比; 2. 建立基于Connors 准则的不稳定常数的确定方法,并提出新的推荐值.
方法:1. 实验研究两相流的流动条件和管束的几何特征对管束阻尼、振动特性及弹性不稳定性的影响; 2. 采用建立稳定区图的方法确定不稳定常数的推荐值; 3. 通过与其他研究成果的对比分析,验证本文推荐的不稳定常数的合理性和可靠性.
结论:1. 相比于阻力方向,升力方向上的阻尼比更小,也更易发生弹性失稳. 2. 四种排列管束的稳定性从高到低依次为:正三角形、正方形、转置正方形、转置正三角形. 3. 对于正方形和正三角形排列管束,推荐不稳定常数为4.0; 对于转置正方形和转置正三角形排列管束,当质量阻尼参数小于或等于0.54时,推荐不稳定常数为1.1,反之,则推荐不稳定常数为1.5.

关键词:管束; 弹性不稳定性; 两相横向流; 设计准则

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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