Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions
The fluid flow in the runner of a hydraulic turbine has serious uncertainties. The sealing failure of the magnetorheological (MR) fluid sealing device of the main shaft of the hydroturbine, caused by a sudden change in speed, has always been a difficult topic to research. This study first derives th...
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doaj-be97f199115e4c68a8c852630087952c2021-07-23T14:03:13ZengMDPI AGProcesses2227-97172021-07-0191171117110.3390/pr9071171Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt ConditionsJie Cheng0Zheng-Gui Li1Yang Xu2Wang-Xu Li3Xin-Rui Li4Key Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu 610039, ChinaKey Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu 610039, ChinaThe fluid flow in the runner of a hydraulic turbine has serious uncertainties. The sealing failure of the magnetorheological (MR) fluid sealing device of the main shaft of the hydroturbine, caused by a sudden change in speed, has always been a difficult topic to research. This study first derives the MR fluid seal pressure and unbalanced curl equations of the hydroturbine main shaft, and then analyzes the seal pressure and friction heat under different rotational speed mutation conditions through experiments. After verification, the temperature field and magnetic field distribution of the MR fluid sealing device of the main shaft of the hydraulic turbine are obtained via numerical calculation. The results show that the external magnetic field affects the magnetic moment of the magnetic particles in the MR fluid, resulting in a significant change in frictional heat, thereby reducing the saturation of magnetic induction intensity of the MR fluid. This results in a decrease in the sealing ability of the device. The size and abrupt amplitude of the main shaft of the hydraulic turbine, and friction heat is positively correlated reducing the sealing ability of the device and causing sealing failure. Based on our results, we recommend adding the necessary cooling to the device to reduce the frictional heat, thereby increasing the seal life of the device.https://www.mdpi.com/2227-9717/9/7/1171frictional heathydraulic turbine main shaftMR fluid sealdifferent speed abrupt conditionsseal failureunbalanced curl |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jie Cheng Zheng-Gui Li Yang Xu Wang-Xu Li Xin-Rui Li |
spellingShingle |
Jie Cheng Zheng-Gui Li Yang Xu Wang-Xu Li Xin-Rui Li Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions Processes frictional heat hydraulic turbine main shaft MR fluid seal different speed abrupt conditions seal failure unbalanced curl |
author_facet |
Jie Cheng Zheng-Gui Li Yang Xu Wang-Xu Li Xin-Rui Li |
author_sort |
Jie Cheng |
title |
Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions |
title_short |
Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions |
title_full |
Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions |
title_fullStr |
Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions |
title_full_unstemmed |
Study on the Unbalanced Curl Seal Failure of the Magnetorheological Fluid Sealing Device of the Hydraulic Turbine Main Shaft under Different Speed Abrupt Conditions |
title_sort |
study on the unbalanced curl seal failure of the magnetorheological fluid sealing device of the hydraulic turbine main shaft under different speed abrupt conditions |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-07-01 |
description |
The fluid flow in the runner of a hydraulic turbine has serious uncertainties. The sealing failure of the magnetorheological (MR) fluid sealing device of the main shaft of the hydroturbine, caused by a sudden change in speed, has always been a difficult topic to research. This study first derives the MR fluid seal pressure and unbalanced curl equations of the hydroturbine main shaft, and then analyzes the seal pressure and friction heat under different rotational speed mutation conditions through experiments. After verification, the temperature field and magnetic field distribution of the MR fluid sealing device of the main shaft of the hydraulic turbine are obtained via numerical calculation. The results show that the external magnetic field affects the magnetic moment of the magnetic particles in the MR fluid, resulting in a significant change in frictional heat, thereby reducing the saturation of magnetic induction intensity of the MR fluid. This results in a decrease in the sealing ability of the device. The size and abrupt amplitude of the main shaft of the hydraulic turbine, and friction heat is positively correlated reducing the sealing ability of the device and causing sealing failure. Based on our results, we recommend adding the necessary cooling to the device to reduce the frictional heat, thereby increasing the seal life of the device. |
topic |
frictional heat hydraulic turbine main shaft MR fluid seal different speed abrupt conditions seal failure unbalanced curl |
url |
https://www.mdpi.com/2227-9717/9/7/1171 |
work_keys_str_mv |
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