Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle
Non-uniform cross flow goes across the heat exchanger tubes of steam generators in nuclear plants, resulting in serious vibrations and wears. The pitch velocity varies among tube bundles and each tube is subjected to different fluid forces, causing inconsistent vibration response of each tube. To ge...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Editorial Board of Atomic Energy Science and Technology
2022-11-01
|
| Series: | Yuanzineng kexue jishu |
| Subjects: | |
| Online Access: | https://www.aest.org.cn/CN/10.7538/yzk.2021.youxian.0912 |
| _version_ | 1828173186851667968 |
|---|---|
| author | LI Xianda;ZHANG Kai;XIONG Zhenqin;JIAO Ming;WANG Shuaiquan;GU Hanyang |
| author_facet | LI Xianda;ZHANG Kai;XIONG Zhenqin;JIAO Ming;WANG Shuaiquan;GU Hanyang |
| author_sort | LI Xianda;ZHANG Kai;XIONG Zhenqin;JIAO Ming;WANG Shuaiquan;GU Hanyang |
| collection | DOAJ |
| description | Non-uniform cross flow goes across the heat exchanger tubes of steam generators in nuclear plants, resulting in serious vibrations and wears. The pitch velocity varies among tube bundles and each tube is subjected to different fluid forces, causing inconsistent vibration response of each tube. To get the flow induced vibration characteristics of the whole heat exchanger tube bundle, an experimental setup of threespan tube bundle with 28 circular tubes and 10 semicircular tubes was designed. The test section has a glass window at the top for vision measurement. Coded reference points were attached on the top of the heat exchanger tubes to improve the accuracy of vision measurement. Different codes correspond to different tubes, enabling the image processing program to automatically identify each tube. The center dots of the reference points also provide a stable tracking target for the image processing program. A baffle with 1/3 opening was set upstream to create nonuniform cross flow to the tube bundle. Vibration displacement of each tube was measured with a high-speed camera and vibration acceleration of a typical tube was measured by an accelerometer, while the tube bundle was subjected to this nonuniform cross flow. In order to contrast with nonuniform cross flow conditions, the vibration of the tube bundle facing a uniform orifice baffle was tested. The results show that the heat exchanger tube bundle is more prone to fluidelastic instability (FEI) under nonuniform cross flow conditions compared to uniform orifice baffle conditions. And the vibration amplitude and frequency of each tube of the whole bundle is unique under nonuniform cross flow conditions. Four local resonance regions coexist in the tube bundle when flow induced vibration instability happens. The most significant fluidelastic instability resonance happens to the central tubes at the bottom three columns facing the opening of baffle. The peak frequency of vibration in this region is consistent with the firstorder natural frequency of the tube with one fixed support in middle and one simple support on top. The non-uniform distribution of the tube bundle vibration response will lead to inconsistent wear of the tubes located in different regions, which adversely affects the maintenance and service life of steam generators. The FEI critical velocity under the nonuniform cross flow was compared with the results predicted by five empirical correlations. Connors correlation and Chen correlation are conservative. The FEI critical velocity predicted by Connors correlation and Chen correlation are 502% and 247% lower than the experimental value, respectively. To predict the FEI critical velocity more accurately under nonuniform cross flow conditions, the Gorman correlation, which is closest to the experimental value, is modified. The results provide guidances for the design of heat exchanger tube bundles of steam generators. |
| first_indexed | 2024-04-12T03:52:06Z |
| format | Article |
| id | doaj.art-8cc3d5abaa4646559772fa2d3d090213 |
| institution | Directory Open Access Journal |
| issn | 1000-6931 |
| language | English |
| last_indexed | 2024-04-12T03:52:06Z |
| publishDate | 2022-11-01 |
| publisher | Editorial Board of Atomic Energy Science and Technology |
| record_format | Article |
| series | Yuanzineng kexue jishu |
| spelling | doaj.art-8cc3d5abaa4646559772fa2d3d0902132022-12-22T03:48:57ZengEditorial Board of Atomic Energy Science and TechnologyYuanzineng kexue jishu1000-69312022-11-01561124502457Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in BundleLI Xianda;ZHANG Kai;XIONG Zhenqin;JIAO Ming;WANG Shuaiquan;GU Hanyang0School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Shanghai Nuclear Engineering Research & Design Institute Co., Ltd., Shanghai 200233, ChinaNon-uniform cross flow goes across the heat exchanger tubes of steam generators in nuclear plants, resulting in serious vibrations and wears. The pitch velocity varies among tube bundles and each tube is subjected to different fluid forces, causing inconsistent vibration response of each tube. To get the flow induced vibration characteristics of the whole heat exchanger tube bundle, an experimental setup of threespan tube bundle with 28 circular tubes and 10 semicircular tubes was designed. The test section has a glass window at the top for vision measurement. Coded reference points were attached on the top of the heat exchanger tubes to improve the accuracy of vision measurement. Different codes correspond to different tubes, enabling the image processing program to automatically identify each tube. The center dots of the reference points also provide a stable tracking target for the image processing program. A baffle with 1/3 opening was set upstream to create nonuniform cross flow to the tube bundle. Vibration displacement of each tube was measured with a high-speed camera and vibration acceleration of a typical tube was measured by an accelerometer, while the tube bundle was subjected to this nonuniform cross flow. In order to contrast with nonuniform cross flow conditions, the vibration of the tube bundle facing a uniform orifice baffle was tested. The results show that the heat exchanger tube bundle is more prone to fluidelastic instability (FEI) under nonuniform cross flow conditions compared to uniform orifice baffle conditions. And the vibration amplitude and frequency of each tube of the whole bundle is unique under nonuniform cross flow conditions. Four local resonance regions coexist in the tube bundle when flow induced vibration instability happens. The most significant fluidelastic instability resonance happens to the central tubes at the bottom three columns facing the opening of baffle. The peak frequency of vibration in this region is consistent with the firstorder natural frequency of the tube with one fixed support in middle and one simple support on top. The non-uniform distribution of the tube bundle vibration response will lead to inconsistent wear of the tubes located in different regions, which adversely affects the maintenance and service life of steam generators. The FEI critical velocity under the nonuniform cross flow was compared with the results predicted by five empirical correlations. Connors correlation and Chen correlation are conservative. The FEI critical velocity predicted by Connors correlation and Chen correlation are 502% and 247% lower than the experimental value, respectively. To predict the FEI critical velocity more accurately under nonuniform cross flow conditions, the Gorman correlation, which is closest to the experimental value, is modified. The results provide guidances for the design of heat exchanger tube bundles of steam generators.https://www.aest.org.cn/CN/10.7538/yzk.2021.youxian.0912vibration of every tube in bundlenon-uniform cross flowfluid-elastic instabilityvisualization measurement |
| spellingShingle | LI Xianda;ZHANG Kai;XIONG Zhenqin;JIAO Ming;WANG Shuaiquan;GU Hanyang Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle Yuanzineng kexue jishu vibration of every tube in bundle non-uniform cross flow fluid-elastic instability visualization measurement |
| title | Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle |
| title_full | Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle |
| title_fullStr | Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle |
| title_full_unstemmed | Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle |
| title_short | Effect of Non-uniform Cross Flow on Flow Induced Vibration of Every Heat Exchanger Tube in Bundle |
| title_sort | effect of non uniform cross flow on flow induced vibration of every heat exchanger tube in bundle |
| topic | vibration of every tube in bundle non-uniform cross flow fluid-elastic instability visualization measurement |
| url | https://www.aest.org.cn/CN/10.7538/yzk.2021.youxian.0912 |
| work_keys_str_mv | AT lixiandazhangkaixiongzhenqinjiaomingwangshuaiquanguhanyang effectofnonuniformcrossflowonflowinducedvibrationofeveryheatexchangertubeinbundle |