Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models

Many annular seals suffer eccentricity because of rotor–stator misalignment or the deflection of a flexible rotor, which has a strong influence on the vibration characteristics and stability of rotating machines. In this article, a transient CFD method based on three whirl models is employed to rese...

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Autores principales:	Fengqin Li, Lulu Zhai, Baoling Cui, Jia Guo, Guoyou Chen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	annular seals dynamic characteristics static eccentricity whirl amplitude transient CFD method Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/2304fdb85e024fb2845801144e02e7f8
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spelling	oai:doaj.org-article:2304fdb85e024fb2845801144e02e7f82021-11-25T18:05:08ZInvestigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models10.3390/jmse91112902077-1312https://doaj.org/article/2304fdb85e024fb2845801144e02e7f82021-11-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1290https://doaj.org/toc/2077-1312Many annular seals suffer eccentricity because of rotor–stator misalignment or the deflection of a flexible rotor, which has a strong influence on the vibration characteristics and stability of rotating machines. In this article, a transient CFD method based on three whirl models is employed to research the dynamic characteristics of annular seals at various static eccentricities. The influence of the whirl amplitude on the dynamic characteristics of eccentric annular seals are also explored. The results of the transient CFD method are compared with the bulk flow model results and the experimental results. It is shown that the transient CFD method possesses high prediction precision for direct damping, with a maximum error of 25%. Negative k<sub>yx</sub> increases by 166% when the static eccentricity ratio is increased from 0 to 0.5. The dynamic characteristics of the annular seal operating at high static eccentric ratio are sensitive to whirl amplitude, and the model with an amplitude of 1% C<sub>r</sub> has great advantages for the prediction of direct virtual-mass, while the model with an amplitude of 10% C<sub>r</sub> has great advantages for the prediction of cross-coupled damping.Fengqin LiLulu ZhaiBaoling CuiJia GuoGuoyou ChenMDPI AGarticleannular sealsdynamic characteristicsstatic eccentricitywhirl amplitudetransient CFD methodNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1290, p 1290 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	annular seals dynamic characteristics static eccentricity whirl amplitude transient CFD method Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	annular seals dynamic characteristics static eccentricity whirl amplitude transient CFD method Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Fengqin Li Lulu Zhai Baoling Cui Jia Guo Guoyou Chen Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
description	Many annular seals suffer eccentricity because of rotor–stator misalignment or the deflection of a flexible rotor, which has a strong influence on the vibration characteristics and stability of rotating machines. In this article, a transient CFD method based on three whirl models is employed to research the dynamic characteristics of annular seals at various static eccentricities. The influence of the whirl amplitude on the dynamic characteristics of eccentric annular seals are also explored. The results of the transient CFD method are compared with the bulk flow model results and the experimental results. It is shown that the transient CFD method possesses high prediction precision for direct damping, with a maximum error of 25%. Negative k<sub>yx</sub> increases by 166% when the static eccentricity ratio is increased from 0 to 0.5. The dynamic characteristics of the annular seal operating at high static eccentric ratio are sensitive to whirl amplitude, and the model with an amplitude of 1% C<sub>r</sub> has great advantages for the prediction of direct virtual-mass, while the model with an amplitude of 10% C<sub>r</sub> has great advantages for the prediction of cross-coupled damping.
format	article
author	Fengqin Li Lulu Zhai Baoling Cui Jia Guo Guoyou Chen
author_facet	Fengqin Li Lulu Zhai Baoling Cui Jia Guo Guoyou Chen
author_sort	Fengqin Li
title	Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
title_short	Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
title_full	Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
title_fullStr	Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
title_full_unstemmed	Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models
title_sort	investigation of the dynamic characteristics of an eccentric annular seal on the basis of a transient cfd method with three whirl models
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2304fdb85e024fb2845801144e02e7f8
work_keys_str_mv	AT fengqinli investigationofthedynamiccharacteristicsofaneccentricannularsealonthebasisofatransientcfdmethodwiththreewhirlmodels AT luluzhai investigationofthedynamiccharacteristicsofaneccentricannularsealonthebasisofatransientcfdmethodwiththreewhirlmodels AT baolingcui investigationofthedynamiccharacteristicsofaneccentricannularsealonthebasisofatransientcfdmethodwiththreewhirlmodels AT jiaguo investigationofthedynamiccharacteristicsofaneccentricannularsealonthebasisofatransientcfdmethodwiththreewhirlmodels AT guoyouchen investigationofthedynamiccharacteristicsofaneccentricannularsealonthebasisofatransientcfdmethodwiththreewhirlmodels
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Investigation of the Dynamic Characteristics of an Eccentric Annular Seal on the Basis of a Transient CFD Method with Three Whirl Models

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