Study on flow characteristics of a synthetic jet by using a vortex method
A synthetic jet is generated by an oscillating flow that a time-averaged mass flow is zero, unlike continuous jets. Synthetic jets have been used for various applications such as mixing enhancement and active controls. The present study investigated flow characteristics of a synthetic jet by using t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2016-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/82/839/82_16-00163/_pdf/-char/en |
| _version_ | 1798015197349150720 |
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| author | Donghyuk KANG Kouichi NISHIBE Kotaro SATO Kazuhiko YOKOTA |
| author_facet | Donghyuk KANG Kouichi NISHIBE Kotaro SATO Kazuhiko YOKOTA |
| author_sort | Donghyuk KANG |
| collection | DOAJ |
| description | A synthetic jet is generated by an oscillating flow that a time-averaged mass flow is zero, unlike continuous jets. Synthetic jets have been used for various applications such as mixing enhancement and active controls. The present study investigated flow characteristics of a synthetic jet by using the vortex method. Continuous and synthetic jets were simulated by distributed sources on a slot and vortex pairs discharged from slot lips and their images. The wall boundary was simulated by the images of vortices. The onset condition of the synthetic jet by the vortex method agrees well with the Holman's result. The mean velocity distribution on the x axis by the vortex method reasonably agrees with the experimental one. For the dimensionless stroke lengths larger than 3.14, vortices remain in the flow field after the period of the suction. The induced velocity of the vortex remaining in the flow field generates the synthetic jet. During the suction, the largest velocity is located near a pair of the vortex groups. The 2nd local maximum in the mean velocity distribution corresponds to that in the frequency distribution of the maximum velocity. The 2nd local maximum is caused by a pair of the vortex groups flowing between x=15 and x=25 slowly. |
| first_indexed | 2024-04-11T15:30:52Z |
| format | Article |
| id | doaj.art-ceca7e57ec59491885e0c8df5556a544 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:30:52Z |
| publishDate | 2016-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-ceca7e57ec59491885e0c8df5556a5442022-12-22T04:16:09ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612016-06-018283916-0016316-0016310.1299/transjsme.16-00163transjsmeStudy on flow characteristics of a synthetic jet by using a vortex methodDonghyuk KANG0Kouichi NISHIBE1Kotaro SATO2Kazuhiko YOKOTA3Aoyama Gakuin Univ. Dept. of Mechanical EngineeringTokyo City Univ. Dept. of Mechanical EngineeringKogakuin Univ. Dept. of Mechanical EngineeringAoyama Gakuin Univ. Dept. of Mechanical EngineeringA synthetic jet is generated by an oscillating flow that a time-averaged mass flow is zero, unlike continuous jets. Synthetic jets have been used for various applications such as mixing enhancement and active controls. The present study investigated flow characteristics of a synthetic jet by using the vortex method. Continuous and synthetic jets were simulated by distributed sources on a slot and vortex pairs discharged from slot lips and their images. The wall boundary was simulated by the images of vortices. The onset condition of the synthetic jet by the vortex method agrees well with the Holman's result. The mean velocity distribution on the x axis by the vortex method reasonably agrees with the experimental one. For the dimensionless stroke lengths larger than 3.14, vortices remain in the flow field after the period of the suction. The induced velocity of the vortex remaining in the flow field generates the synthetic jet. During the suction, the largest velocity is located near a pair of the vortex groups. The 2nd local maximum in the mean velocity distribution corresponds to that in the frequency distribution of the maximum velocity. The 2nd local maximum is caused by a pair of the vortex groups flowing between x=15 and x=25 slowly.https://www.jstage.jst.go.jp/article/transjsme/82/839/82_16-00163/_pdf/-char/ensynthetic jetvortex methodonset condition of synthetic jet2nd local maximum |
| spellingShingle | Donghyuk KANG Kouichi NISHIBE Kotaro SATO Kazuhiko YOKOTA Study on flow characteristics of a synthetic jet by using a vortex method Nihon Kikai Gakkai ronbunshu synthetic jet vortex method onset condition of synthetic jet 2nd local maximum |
| title | Study on flow characteristics of a synthetic jet by using a vortex method |
| title_full | Study on flow characteristics of a synthetic jet by using a vortex method |
| title_fullStr | Study on flow characteristics of a synthetic jet by using a vortex method |
| title_full_unstemmed | Study on flow characteristics of a synthetic jet by using a vortex method |
| title_short | Study on flow characteristics of a synthetic jet by using a vortex method |
| title_sort | study on flow characteristics of a synthetic jet by using a vortex method |
| topic | synthetic jet vortex method onset condition of synthetic jet 2nd local maximum |
| url | https://www.jstage.jst.go.jp/article/transjsme/82/839/82_16-00163/_pdf/-char/en |
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