Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals
To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the t...
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| Veröffentlicht in: | Materials 2019-07, Vol.12 (14), p.2324 |
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| creator | Sun, Dan Li, Sheng-Yuan Zhao, Huan Fei, Cheng-Wei |
| description | To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability. |
| doi_str_mv | 10.3390/ma12142324 |
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Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma12142324</identifier><identifier>PMID: 31330903</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Clearances ; Coefficient of variation ; Convergence ; Damping ; Dynamic characteristics ; Eccentricity ; Efficiency ; Elliptical orbits ; Finite element method ; Journal bearings ; Orbits ; Pressure distribution ; Resonant frequencies ; Rotors ; Seals (stoppers) ; Stiffness coefficients ; Systems stability ; Tapering ; Velocity</subject><ispartof>Materials, 2019-07, Vol.12 (14), p.2324</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2019 by the authors. 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c406t-a0c3f6c8ecacef792ba89bb7f0d21cb88c4098aa24aae0f374e5da3ac8052b8d3</citedby><cites>FETCH-LOGICAL-c406t-a0c3f6c8ecacef792ba89bb7f0d21cb88c4098aa24aae0f374e5da3ac8052b8d3</cites><orcidid>0000-0001-5333-1055</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC6678276/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC6678276/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,723,776,780,881,27901,27902,53766,53768</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/31330903$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Sun, Dan</creatorcontrib><creatorcontrib>Li, Sheng-Yuan</creatorcontrib><creatorcontrib>Zhao, Huan</creatorcontrib><creatorcontrib>Fei, Cheng-Wei</creatorcontrib><title>Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals</title><title>Materials</title><addtitle>Materials (Basel)</addtitle><description>To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability.</description><subject>Clearances</subject><subject>Coefficient of variation</subject><subject>Convergence</subject><subject>Damping</subject><subject>Dynamic characteristics</subject><subject>Eccentricity</subject><subject>Efficiency</subject><subject>Elliptical orbits</subject><subject>Finite element method</subject><subject>Journal bearings</subject><subject>Orbits</subject><subject>Pressure distribution</subject><subject>Resonant frequencies</subject><subject>Rotors</subject><subject>Seals (stoppers)</subject><subject>Stiffness coefficients</subject><subject>Systems stability</subject><subject>Tapering</subject><subject>Velocity</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpdkV1LHTEQhoNUVI7e-ANKoDdFWM3X2U1uCuWc-gGipep1mM1mjyu7yWmyK_gj-p-d1s8aAjNMnncyyUvIPmeHUhp2NAAXXAkp1AbZ4caUBTdKfXqXb5O9nO8YLim5FmaLbEsuJTNM7pA_F9PgU-egp2fh3uexW8HYxUBxX42YOgqhob_iGFOxfAgwYGVxCwnciDrkXaaxpYuI6rTyYSyuYe2Tb_7plt3H6mnsffETRlQHegKZLmHAE3rloc-7ZLPF4Pee44zcHP-4XpwW55cnZ4vv54VTrBwLYE62pdPegfNtZUQN2tR11bJGcFdrjZjRAEIBeNbKSvl5AxKcZnNR60bOyLenvuupHnzjcMAEvV2nboD0YCN09v-T0N3aVby3ZVlpUZXY4OtzgxR_T_htduiy830PwccpWyEVw7tkyRH98gG9i1MK-Dwr5kqXWnJ0YkYOniiXYs7Jt6_DcGb_Gm3fjEb48_vxX9EXW-UjE1umiw</recordid><startdate>20190721</startdate><enddate>20190721</enddate><creator>Sun, Dan</creator><creator>Li, Sheng-Yuan</creator><creator>Zhao, Huan</creator><creator>Fei, Cheng-Wei</creator><general>MDPI AG</general><general>MDPI</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PIMPY</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQGLB</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0001-5333-1055</orcidid></search><sort><creationdate>20190721</creationdate><title>Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals</title><author>Sun, Dan ; Li, Sheng-Yuan ; Zhao, Huan ; Fei, Cheng-Wei</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c406t-a0c3f6c8ecacef792ba89bb7f0d21cb88c4098aa24aae0f374e5da3ac8052b8d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Clearances</topic><topic>Coefficient of variation</topic><topic>Convergence</topic><topic>Damping</topic><topic>Dynamic characteristics</topic><topic>Eccentricity</topic><topic>Efficiency</topic><topic>Elliptical orbits</topic><topic>Finite element method</topic><topic>Journal bearings</topic><topic>Orbits</topic><topic>Pressure distribution</topic><topic>Resonant frequencies</topic><topic>Rotors</topic><topic>Seals (stoppers)</topic><topic>Stiffness coefficients</topic><topic>Systems stability</topic><topic>Tapering</topic><topic>Velocity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sun, Dan</creatorcontrib><creatorcontrib>Li, Sheng-Yuan</creatorcontrib><creatorcontrib>Zhao, Huan</creatorcontrib><creatorcontrib>Fei, Cheng-Wei</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection (ProQuest)</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Research Database</collection><collection>Materials Science Database</collection><collection>Materials Science Collection</collection><collection>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Applied & Life Sciences</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sun, Dan</au><au>Li, Sheng-Yuan</au><au>Zhao, Huan</au><au>Fei, Cheng-Wei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals</atitle><jtitle>Materials</jtitle><addtitle>Materials (Basel)</addtitle><date>2019-07-21</date><risdate>2019</risdate><volume>12</volume><issue>14</issue><spage>2324</spage><pages>2324-</pages><issn>1996-1944</issn><eissn>1996-1944</eissn><abstract>To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>31330903</pmid><doi>10.3390/ma12142324</doi><orcidid>https://orcid.org/0000-0001-5333-1055</orcidid><oa>free_for_read</oa></addata></record> |
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| source | MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; PubMed Central Open Access |
| subjects | Clearances Coefficient of variation Convergence Damping Dynamic characteristics Eccentricity Efficiency Elliptical orbits Finite element method Journal bearings Orbits Pressure distribution Resonant frequencies Rotors Seals (stoppers) Stiffness coefficients Systems stability Tapering Velocity |
| title | Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals |
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