Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation
Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates the effects of blade oscillations on aerodynamic performance and turbulent flow characteristics of modern gas-turbine compressors. Highly accurate direct numerical simulations...
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| Veröffentlicht in: | Energy (Oxford) 2022-03, Vol.242, p.122988, Article 122988 |
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| creator | Nakhchi, M.E. Naung, S. Win Rahmati, M. |
| description | Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates the effects of blade oscillations on aerodynamic performance and turbulent flow characteristics of modern gas-turbine compressors. Highly accurate direct numerical simulations (DNS) are performed based on the spectral-hp element method to predict the flow instabilities, pressure fluctuations and vortex generation on the surface of the compressor blades by considering all complex physical parameters at different vibration frequencies (0 |
| doi_str_mv | 10.1016/j.energy.2021.122988 |
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•The vibration effects on flow structure over axial compressor blades are studied.•Separation occurred 8.28% faster over vibrating blade compared to stationary one.•Oscillations have huge impact on vortex generation and LSB in compressor cascade.•Strong pressure fluctuations are observed in the wake region of vibrating blade.•Additional flow disturbance is detected due to higher vibration frequencies.</description><identifier>ISSN: 0360-5442</identifier><identifier>EISSN: 1873-6785</identifier><identifier>DOI: 10.1016/j.energy.2021.122988</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Aerodynamics ; Blade oscillations ; Compressor ; Compressor blades ; Direct numerical simulation ; DNS ; Flow characteristics ; Fluctuations ; Fluid flow ; Flutter ; Gas turbines ; Mathematical models ; Oscillations ; Phages ; Physical properties ; Pressure ; Pressure distribution ; Simulation ; Spectral-hp element ; Suction ; Transient flow ; Turbines ; Turbocompressors ; Turbulent flow ; Vibration ; Vibrations</subject><ispartof>Energy (Oxford), 2022-03, Vol.242, p.122988, Article 122988</ispartof><rights>2022 The Authors</rights><rights>Copyright Elsevier BV Mar 1, 2022</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c380t-62a1a089e0f62f17f557b6528146bd889f5bde37cb9cce40d16bef08893491173</citedby><cites>FETCH-LOGICAL-c380t-62a1a089e0f62f17f557b6528146bd889f5bde37cb9cce40d16bef08893491173</cites><orcidid>0000-0003-4903-5370</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0360544221032370$$EHTML$$P50$$Gelsevier$$Hfree_for_read</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Nakhchi, M.E.</creatorcontrib><creatorcontrib>Naung, S. Win</creatorcontrib><creatorcontrib>Rahmati, M.</creatorcontrib><title>Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation</title><title>Energy (Oxford)</title><description>Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates the effects of blade oscillations on aerodynamic performance and turbulent flow characteristics of modern gas-turbine compressors. Highly accurate direct numerical simulations (DNS) are performed based on the spectral-hp element method to predict the flow instabilities, pressure fluctuations and vortex generation on the surface of the compressor blades by considering all complex physical parameters at different vibration frequencies (0 < f < 8.28 Hz). The main novelty of this study is to consider the aeroelastic vibrations of the compressor blades in DNS analysis. The novel proposed method enables the detailed analysis of complex structure fluid interactions, which cannot be obtained using other methods such as RANS models. The simulations revealed that the blade oscillations have a huge impact on the vortex generation and laminar separation bubble on the suction side of the blade. Moreover, the amplitude of unsteady pressure distribution is greater at 90% span, with the phage angle deviating between 100° and 350°. Strong fluctuations are observed at the centre of the wake region of the vibrating blade cascade. These fluctuations are activated by the flow disturbances resulting from the blade oscillation. Moreover, intense pressure fluctuations happen in the wake region of the oscillating compressor blade compared with the stationary one. The separating point occurred 8.28% sooner on the suction surface of the vibrating blade with k = 0.4 (Xsep/C = 0.288) compared to the stationary blade with Xsep/C = 0.314.
•The vibration effects on flow structure over axial compressor blades are studied.•Separation occurred 8.28% faster over vibrating blade compared to stationary one.•Oscillations have huge impact on vortex generation and LSB in compressor cascade.•Strong pressure fluctuations are observed in the wake region of vibrating blade.•Additional flow disturbance is detected due to higher vibration frequencies.</description><subject>Aerodynamics</subject><subject>Blade oscillations</subject><subject>Compressor</subject><subject>Compressor blades</subject><subject>Direct numerical simulation</subject><subject>DNS</subject><subject>Flow characteristics</subject><subject>Fluctuations</subject><subject>Fluid flow</subject><subject>Flutter</subject><subject>Gas turbines</subject><subject>Mathematical models</subject><subject>Oscillations</subject><subject>Phages</subject><subject>Physical properties</subject><subject>Pressure</subject><subject>Pressure distribution</subject><subject>Simulation</subject><subject>Spectral-hp element</subject><subject>Suction</subject><subject>Transient flow</subject><subject>Turbines</subject><subject>Turbocompressors</subject><subject>Turbulent flow</subject><subject>Vibration</subject><subject>Vibrations</subject><issn>0360-5442</issn><issn>1873-6785</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhoMouK7-Aw8Bz12TtE1TD4L4DYIXPYc0nSxZ2mSdtOL-e7t2z57mMM_7DvMQcsnZijMurzcrCIDr3UowwVdciFqpI7LgqsozWanymCxYLllWFoU4JWcpbRhjparrBfl5Da4bIVig0dGmMy3Qb9-gGXwMicZADWBsd8H03tItoIvYmwNufrzpqI39FiGliNQHujaJDiM2PsANffAIdqBh7AG9ndjk-7H76z4nJ850CS4Oc0k-nx4_7l-yt_fn1_u7t8zmig2ZFIYbpmpgTgrHK1eWVSNLoXghm1ap2pVNC3llm9paKFjLZQOOTYu8qDmv8iW5mnu3GL9GSIPexBHDdFILmStRcyGLiSpmymJMCcHpLfre4E5zpveO9UbPjvXesZ4dT7HbOQbTB98eUCfr9zLbv8d1G_3_Bb8ubojl</recordid><startdate>20220301</startdate><enddate>20220301</enddate><creator>Nakhchi, M.E.</creator><creator>Naung, S. Win</creator><creator>Rahmati, M.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7ST</scope><scope>7TB</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-4903-5370</orcidid></search><sort><creationdate>20220301</creationdate><title>Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation</title><author>Nakhchi, M.E. ; Naung, S. Win ; Rahmati, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-62a1a089e0f62f17f557b6528146bd889f5bde37cb9cce40d16bef08893491173</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Aerodynamics</topic><topic>Blade oscillations</topic><topic>Compressor</topic><topic>Compressor blades</topic><topic>Direct numerical simulation</topic><topic>DNS</topic><topic>Flow characteristics</topic><topic>Fluctuations</topic><topic>Fluid flow</topic><topic>Flutter</topic><topic>Gas turbines</topic><topic>Mathematical models</topic><topic>Oscillations</topic><topic>Phages</topic><topic>Physical properties</topic><topic>Pressure</topic><topic>Pressure distribution</topic><topic>Simulation</topic><topic>Spectral-hp element</topic><topic>Suction</topic><topic>Transient flow</topic><topic>Turbines</topic><topic>Turbocompressors</topic><topic>Turbulent flow</topic><topic>Vibration</topic><topic>Vibrations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nakhchi, M.E.</creatorcontrib><creatorcontrib>Naung, S. Win</creatorcontrib><creatorcontrib>Rahmati, M.</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Energy (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nakhchi, M.E.</au><au>Naung, S. Win</au><au>Rahmati, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation</atitle><jtitle>Energy (Oxford)</jtitle><date>2022-03-01</date><risdate>2022</risdate><volume>242</volume><spage>122988</spage><pages>122988-</pages><artnum>122988</artnum><issn>0360-5442</issn><eissn>1873-6785</eissn><abstract>Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates the effects of blade oscillations on aerodynamic performance and turbulent flow characteristics of modern gas-turbine compressors. Highly accurate direct numerical simulations (DNS) are performed based on the spectral-hp element method to predict the flow instabilities, pressure fluctuations and vortex generation on the surface of the compressor blades by considering all complex physical parameters at different vibration frequencies (0 < f < 8.28 Hz). The main novelty of this study is to consider the aeroelastic vibrations of the compressor blades in DNS analysis. The novel proposed method enables the detailed analysis of complex structure fluid interactions, which cannot be obtained using other methods such as RANS models. The simulations revealed that the blade oscillations have a huge impact on the vortex generation and laminar separation bubble on the suction side of the blade. Moreover, the amplitude of unsteady pressure distribution is greater at 90% span, with the phage angle deviating between 100° and 350°. Strong fluctuations are observed at the centre of the wake region of the vibrating blade cascade. These fluctuations are activated by the flow disturbances resulting from the blade oscillation. Moreover, intense pressure fluctuations happen in the wake region of the oscillating compressor blade compared with the stationary one. The separating point occurred 8.28% sooner on the suction surface of the vibrating blade with k = 0.4 (Xsep/C = 0.288) compared to the stationary blade with Xsep/C = 0.314.
•The vibration effects on flow structure over axial compressor blades are studied.•Separation occurred 8.28% faster over vibrating blade compared to stationary one.•Oscillations have huge impact on vortex generation and LSB in compressor cascade.•Strong pressure fluctuations are observed in the wake region of vibrating blade.•Additional flow disturbance is detected due to higher vibration frequencies.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.energy.2021.122988</doi><orcidid>https://orcid.org/0000-0003-4903-5370</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Elsevier ScienceDirect Journals |
| subjects | Aerodynamics Blade oscillations Compressor Compressor blades Direct numerical simulation DNS Flow characteristics Fluctuations Fluid flow Flutter Gas turbines Mathematical models Oscillations Phages Physical properties Pressure Pressure distribution Simulation Spectral-hp element Suction Transient flow Turbines Turbocompressors Turbulent flow Vibration Vibrations |
| title | Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation |
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