Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator
This study is concerned with the active flow control of a two-dimensional offset jet using a dielectric barrier discharge plasma actuator (PA). The offset jet is produced by the flow of air that issues from the end of a long parallel channel, and the offset ratio H/h (H: step height, h: channel heig...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-04-01
|
| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/849/83_17-00031/_pdf/-char/en |
| _version_ | 1811317673327329280 |
|---|---|
| author | Yusuke NOGI Masatoshi SANO Kuniaki TOYODA Shinji HONAMI |
| author_facet | Yusuke NOGI Masatoshi SANO Kuniaki TOYODA Shinji HONAMI |
| author_sort | Yusuke NOGI |
| collection | DOAJ |
| description | This study is concerned with the active flow control of a two-dimensional offset jet using a dielectric barrier discharge plasma actuator (PA). The offset jet is produced by the flow of air that issues from the end of a long parallel channel, and the offset ratio H/h (H: step height, h: channel height) is 1.0. The PA is operated by a continuous sinusoidal waveform with a voltage of 6 kV and frequency of 2.0 kHz applied to the actuator electrode. The PA is installed on the lower wall of the jet exit. The exit Reynolds number Re is changed from 1.5 × 103 to 6.0 × 103. The flow at the channel exit is laminar. The wall static pressure and heat transfer coefficient on the offset plate are measured. The flow field is examined by flow visualization using a CCD high-speed camera, and the velocity profiles are measured using a particle image velocimetry system. In flow without control, clockwise and counter-clockwise vortices appear downstream of the reattachment point. When the PA is applied, these vortices disappear at a short distance from the reattachment point and a transition from laminar flow to turbulent flow occurs immediately. The reattachment length is reduced and the pressure loss is decreased. Nusselt number in the recirculating region increases with the induced flow due to the PA. These effects are remarkable at low Reynolds number flow. Downstream of the reattachment point, Nusselt number is smaller than that without the PA because turbulent diffusion is promoted. |
| first_indexed | 2024-04-13T12:12:23Z |
| format | Article |
| id | doaj.art-23cb42e5724c4d7abecb2222c7459906 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T12:12:23Z |
| publishDate | 2017-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-23cb42e5724c4d7abecb2222c74599062022-12-22T02:47:26ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-04-018384917-0003117-0003110.1299/transjsme.17-00031transjsmeFluid flow and heat transfer of a two-dimensional offset jet with a plasma actuatorYusuke NOGI0Masatoshi SANO1Kuniaki TOYODA2Shinji HONAMI3Department of Mechanical Engineering, Chiba Institute of TechnologyDepartment of Mechanical Engineering, Chiba Institute of TechnologyDepartment of Mechanical Engineering, Hokkaido University of ScienceDepartment of Mechanical Engineering, Tokyo University of ScienceThis study is concerned with the active flow control of a two-dimensional offset jet using a dielectric barrier discharge plasma actuator (PA). The offset jet is produced by the flow of air that issues from the end of a long parallel channel, and the offset ratio H/h (H: step height, h: channel height) is 1.0. The PA is operated by a continuous sinusoidal waveform with a voltage of 6 kV and frequency of 2.0 kHz applied to the actuator electrode. The PA is installed on the lower wall of the jet exit. The exit Reynolds number Re is changed from 1.5 × 103 to 6.0 × 103. The flow at the channel exit is laminar. The wall static pressure and heat transfer coefficient on the offset plate are measured. The flow field is examined by flow visualization using a CCD high-speed camera, and the velocity profiles are measured using a particle image velocimetry system. In flow without control, clockwise and counter-clockwise vortices appear downstream of the reattachment point. When the PA is applied, these vortices disappear at a short distance from the reattachment point and a transition from laminar flow to turbulent flow occurs immediately. The reattachment length is reduced and the pressure loss is decreased. Nusselt number in the recirculating region increases with the induced flow due to the PA. These effects are remarkable at low Reynolds number flow. Downstream of the reattachment point, Nusselt number is smaller than that without the PA because turbulent diffusion is promoted.https://www.jstage.jst.go.jp/article/transjsme/83/849/83_17-00031/_pdf/-char/enoffset jetplasma actuatorpressure distributionheat transfervelocity profile |
| spellingShingle | Yusuke NOGI Masatoshi SANO Kuniaki TOYODA Shinji HONAMI Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator Nihon Kikai Gakkai ronbunshu offset jet plasma actuator pressure distribution heat transfer velocity profile |
| title | Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator |
| title_full | Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator |
| title_fullStr | Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator |
| title_full_unstemmed | Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator |
| title_short | Fluid flow and heat transfer of a two-dimensional offset jet with a plasma actuator |
| title_sort | fluid flow and heat transfer of a two dimensional offset jet with a plasma actuator |
| topic | offset jet plasma actuator pressure distribution heat transfer velocity profile |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/849/83_17-00031/_pdf/-char/en |
| work_keys_str_mv | AT yusukenogi fluidflowandheattransferofatwodimensionaloffsetjetwithaplasmaactuator AT masatoshisano fluidflowandheattransferofatwodimensionaloffsetjetwithaplasmaactuator AT kuniakitoyoda fluidflowandheattransferofatwodimensionaloffsetjetwithaplasmaactuator AT shinjihonami fluidflowandheattransferofatwodimensionaloffsetjetwithaplasmaactuator |