Experimental investigation on characteristics of cavitation-induced vibration on the runner of a bulb turbine
Cavitation may result in reduced efficiency, increased noise and vibration and weight loss of a hydraulic turbine when local pressure is lower than the vaporization pressure. In this paper, a synchronous test system including high-speed camera and Laser Doppler Vibrometer (LDV) is established to ana...
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| Published in | Mechanical systems and signal processing Vol. 189; p. 110097 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
15.04.2023
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0888-3270 1096-1216 |
| DOI | 10.1016/j.ymssp.2023.110097 |
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| Abstract | Cavitation may result in reduced efficiency, increased noise and vibration and weight loss of a hydraulic turbine when local pressure is lower than the vaporization pressure. In this paper, a synchronous test system including high-speed camera and Laser Doppler Vibrometer (LDV) is established to analyze characteristics of cavitation-induced vibration on the runner of a bulb turbine under different cavitation states. The results show that the peak-to-peak and Root Mean Square (RMS) values of vibration velocities on the turbine runner both increase with the severity of cavitation, but the growth rate is remarkably different which strongly depends on the cavitation state. The runner vibration velocity holds a normal distribution for all cavitation states, and the variance of the normal distribution increases gradually with the severity of cavitation. The increase of cavitation level is accompanied by frequency band migration of vibration signals. In the state of complete cavitation, the local energy extreme of the medium-high frequency component of the runner vibration velocity signal migrates to the low frequency region, resulting in an obvious increase in the energy of the low frequency region. |
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| AbstractList | Cavitation may result in reduced efficiency, increased noise and vibration and weight loss of a hydraulic turbine when local pressure is lower than the vaporization pressure. In this paper, a synchronous test system including high-speed camera and Laser Doppler Vibrometer (LDV) is established to analyze characteristics of cavitation-induced vibration on the runner of a bulb turbine under different cavitation states. The results show that the peak-to-peak and Root Mean Square (RMS) values of vibration velocities on the turbine runner both increase with the severity of cavitation, but the growth rate is remarkably different which strongly depends on the cavitation state. The runner vibration velocity holds a normal distribution for all cavitation states, and the variance of the normal distribution increases gradually with the severity of cavitation. The increase of cavitation level is accompanied by frequency band migration of vibration signals. In the state of complete cavitation, the local energy extreme of the medium-high frequency component of the runner vibration velocity signal migrates to the low frequency region, resulting in an obvious increase in the energy of the low frequency region. |
| ArticleNumber | 110097 |
| Author | Liu, Boxing Wu, Guangkuan Feng, Jianjun Li, Kang Zhu, Guojun Luo, Xingqi |
| Author_xml | – sequence: 1 givenname: Jianjun surname: Feng fullname: Feng, Jianjun email: jianjunfeng@xaut.edu.cn – sequence: 2 givenname: Boxing surname: Liu fullname: Liu, Boxing – sequence: 3 givenname: Xingqi surname: Luo fullname: Luo, Xingqi email: luoxq@xaut.edu.cn – sequence: 4 givenname: Guojun surname: Zhu fullname: Zhu, Guojun – sequence: 5 givenname: Kang surname: Li fullname: Li, Kang – sequence: 6 givenname: Guangkuan surname: Wu fullname: Wu, Guangkuan |
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| Cites_doi | 10.3182/20080706-5-KR-1001.02273 10.1109/ECCE.2012.6342276 10.1016/j.cej.2017.03.044 10.1109/APPEEC.2009.4918211 10.1016/j.simpat.2016.11.005 10.1142/S1793536909000047 10.1016/j.apacoust.2021.108289 10.1109/TIA.2020.2966168 10.1098/rspa.1998.0193 10.1142/S1793536909000187 10.1016/j.jsv.2020.115682 10.1016/j.oceaneng.2020.108512 10.1007/s40799-020-00362-z 10.1016/j.eswa.2014.07.029 10.1016/j.ymssp.2019.106613 10.1016/S1001-6058(16)60638-8 10.1016/j.rser.2015.06.023 10.1016/j.ymssp.2004.08.006 10.1016/j.ymssp.2018.07.053 10.1209/0295-5075/123/20011 10.1109/TIP.2013.2286326 10.29252/jafm.12.06.29901 10.1103/PhysRevLett.100.084102 10.1016/j.euromechflu.2018.10.015 10.1016/j.eswa.2007.08.021 10.1016/j.ijheatfluidflow.2015.04.001 |
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| Snippet | Cavitation may result in reduced efficiency, increased noise and vibration and weight loss of a hydraulic turbine when local pressure is lower than the... |
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| SubjectTerms | Bulb turbine Cavitation Frequency analysis Signal processing Vibration |
| Title | Experimental investigation on characteristics of cavitation-induced vibration on the runner of a bulb turbine |
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