Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation

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SI, Heyong ;CAO, Lihua ;LI, Pan .
Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 66, n.3, p. 164-174, march 2020. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/>. Date accessed: 29 nov. 2021. 
doi:http://dx.doi.org/10.5545/sv-jme.2019.6283.
Si, H., Cao, L., & Li, P.
(2020).
Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation.
Strojniški vestnik - Journal of Mechanical Engineering, 66(3), 164-174.
doi:http://dx.doi.org/10.5545/sv-jme.2019.6283
@article{sv-jmesv-jme.2019.6283,
	author = {Heyong  Si and Lihua  Cao and Pan  Li},
	title = {Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {3},
	year = {2020},
	keywords = {steam turbine; labyrinth seal; steam flow excited vibration; rotor dynamic characteristics; mesh deformation; stability},
	abstract = {In order to study the steam flow excited vibration caused by the eccentricity of a rotor, three-dimensional rotor whirl motion is simulated based on mesh deformation. The mechanism of steam flow excited vibration and its influence on the dynamic characteristics of the rotor are investigated. The results show that the exciting forces change with the displacement of the rotor’s centre. Rotor dynamic coefficients are nonlinear when the rotor whirls pass the mesh deformation. The rotor dynamic coefficients and effective damping increase with the increase of whirl frequency. When the whirl frequency is 24.41 Hz, the rotor dynamic coefficients are strongly affected by rotational velocity. The maximum fluctuations of average direct stiffness, cross-coupling stiffness, direct damping and cross-coupling damping are 8.1 %, 113.2 %, 45.8 %, and 121.0 %, respectively. Effective damping fluctuates greatly when both whirl and rotational frequency are 24.41 Hz. The direct stiffness, direct damping, and effective damping increase with the increase of pressure ratio, which can improve rotor stability. The pressure fluctuation on the rotor’s surface is a primary reason for steam flow excited vibration. The stability margin of the rotor can be estimated precisely via effective damping.},
	issn = {0039-2480},	pages = {164-174},	doi = {10.5545/sv-jme.2019.6283},
	url = {https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/}
}
Si, H.,Cao, L.,Li, P.
2020 March 66. Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 66:3
%A Si, Heyong 
%A Cao, Lihua 
%A Li, Pan 
%D 2020
%T Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation
%B 2020
%9 steam turbine; labyrinth seal; steam flow excited vibration; rotor dynamic characteristics; mesh deformation; stability
%! Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation
%K steam turbine; labyrinth seal; steam flow excited vibration; rotor dynamic characteristics; mesh deformation; stability
%X In order to study the steam flow excited vibration caused by the eccentricity of a rotor, three-dimensional rotor whirl motion is simulated based on mesh deformation. The mechanism of steam flow excited vibration and its influence on the dynamic characteristics of the rotor are investigated. The results show that the exciting forces change with the displacement of the rotor’s centre. Rotor dynamic coefficients are nonlinear when the rotor whirls pass the mesh deformation. The rotor dynamic coefficients and effective damping increase with the increase of whirl frequency. When the whirl frequency is 24.41 Hz, the rotor dynamic coefficients are strongly affected by rotational velocity. The maximum fluctuations of average direct stiffness, cross-coupling stiffness, direct damping and cross-coupling damping are 8.1 %, 113.2 %, 45.8 %, and 121.0 %, respectively. Effective damping fluctuates greatly when both whirl and rotational frequency are 24.41 Hz. The direct stiffness, direct damping, and effective damping increase with the increase of pressure ratio, which can improve rotor stability. The pressure fluctuation on the rotor’s surface is a primary reason for steam flow excited vibration. The stability margin of the rotor can be estimated precisely via effective damping.
%U https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/
%0 Journal Article
%R 10.5545/sv-jme.2019.6283
%& 164
%P 11
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 66
%N 3
%@ 0039-2480
%8 2020-03-13
%7 2020-03-13
Si, Heyong, Lihua  Cao, & Pan  Li.
"Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation." Strojniški vestnik - Journal of Mechanical Engineering [Online], 66.3 (2020): 164-174. Web.  29 Nov. 2021
TY  - JOUR
AU  - Si, Heyong 
AU  - Cao, Lihua 
AU  - Li, Pan 
PY  - 2020
TI  - Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6283
KW  - steam turbine; labyrinth seal; steam flow excited vibration; rotor dynamic characteristics; mesh deformation; stability
N2  - In order to study the steam flow excited vibration caused by the eccentricity of a rotor, three-dimensional rotor whirl motion is simulated based on mesh deformation. The mechanism of steam flow excited vibration and its influence on the dynamic characteristics of the rotor are investigated. The results show that the exciting forces change with the displacement of the rotor’s centre. Rotor dynamic coefficients are nonlinear when the rotor whirls pass the mesh deformation. The rotor dynamic coefficients and effective damping increase with the increase of whirl frequency. When the whirl frequency is 24.41 Hz, the rotor dynamic coefficients are strongly affected by rotational velocity. The maximum fluctuations of average direct stiffness, cross-coupling stiffness, direct damping and cross-coupling damping are 8.1 %, 113.2 %, 45.8 %, and 121.0 %, respectively. Effective damping fluctuates greatly when both whirl and rotational frequency are 24.41 Hz. The direct stiffness, direct damping, and effective damping increase with the increase of pressure ratio, which can improve rotor stability. The pressure fluctuation on the rotor’s surface is a primary reason for steam flow excited vibration. The stability margin of the rotor can be estimated precisely via effective damping.
UR  - https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/
@article{{sv-jme}{sv-jme.2019.6283},
	author = {Si, H., Cao, L., Li, P.},
	title = {Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {3},
	year = {2020},
	doi = {10.5545/sv-jme.2019.6283},
	url = {https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/}
}
TY  - JOUR
AU  - Si, Heyong 
AU  - Cao, Lihua 
AU  - Li, Pan 
PY  - 2020/03/13
TI  - Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 66, No 3 (2020): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6283
KW  - steam turbine, labyrinth seal, steam flow excited vibration, rotor dynamic characteristics, mesh deformation, stability
N2  - In order to study the steam flow excited vibration caused by the eccentricity of a rotor, three-dimensional rotor whirl motion is simulated based on mesh deformation. The mechanism of steam flow excited vibration and its influence on the dynamic characteristics of the rotor are investigated. The results show that the exciting forces change with the displacement of the rotor’s centre. Rotor dynamic coefficients are nonlinear when the rotor whirls pass the mesh deformation. The rotor dynamic coefficients and effective damping increase with the increase of whirl frequency. When the whirl frequency is 24.41 Hz, the rotor dynamic coefficients are strongly affected by rotational velocity. The maximum fluctuations of average direct stiffness, cross-coupling stiffness, direct damping and cross-coupling damping are 8.1 %, 113.2 %, 45.8 %, and 121.0 %, respectively. Effective damping fluctuates greatly when both whirl and rotational frequency are 24.41 Hz. The direct stiffness, direct damping, and effective damping increase with the increase of pressure ratio, which can improve rotor stability. The pressure fluctuation on the rotor’s surface is a primary reason for steam flow excited vibration. The stability margin of the rotor can be estimated precisely via effective damping.
UR  - https://www.sv-jme.eu/article/dynamic-characteristics-and-stability-prediction-of-steam-turbine-rotor-based-on-mesh-deformation/
Si, Heyong, Cao, Lihua, AND Li, Pan.
"Dynamic Characteristics and Stability Prediction of Steam Turbine Rotor Based on Mesh Deformation" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 66 Number 3 (13 March 2020)

Authors

Affiliations

  • Northeast Electric Power University, Department of Energy and Power Engineering, China 1

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 66(2020)3, 164-174

https://doi.org/10.5545/sv-jme.2019.6283

In order to study the steam flow excited vibration caused by the eccentricity of a rotor, three-dimensional rotor whirl motion is simulated based on mesh deformation. The mechanism of steam flow excited vibration and its influence on the dynamic characteristics of the rotor are investigated. The results show that the exciting forces change with the displacement of the rotor’s centre. Rotor dynamic coefficients are nonlinear when the rotor whirls pass the mesh deformation. The rotor dynamic coefficients and effective damping increase with the increase of whirl frequency. When the whirl frequency is 24.41 Hz, the rotor dynamic coefficients are strongly affected by rotational velocity. The maximum fluctuations of average direct stiffness, cross-coupling stiffness, direct damping and cross-coupling damping are 8.1 %, 113.2 %, 45.8 %, and 121.0 %, respectively. Effective damping fluctuates greatly when both whirl and rotational frequency are 24.41 Hz. The direct stiffness, direct damping, and effective damping increase with the increase of pressure ratio, which can improve rotor stability. The pressure fluctuation on the rotor’s surface is a primary reason for steam flow excited vibration. The stability margin of the rotor can be estimated precisely via effective damping.

steam turbine; labyrinth seal; steam flow excited vibration; rotor dynamic characteristics; mesh deformation; stability