Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuation...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/105660 http://hdl.handle.net/10220/48723 |
| _version_ | 1811685269828534272 |
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| author | Tang, Zhanqi Jiang, Nan Zheng, Xiaobo Wu, Yanhua |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Tang, Zhanqi Jiang, Nan Zheng, Xiaobo Wu, Yanhua |
| author_sort | Tang, Zhanqi |
| collection | NTU |
| description | This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuations acquired by triple decomposition were devoted to observing the AM effects. The PZT actuator has a significant impact on the distribution of AM coefficients and joint probability-density functions of large-scale fluctuations and the representatives of small scales in the inner region. Moreover, the energy dependence of small scales on large-scale structures was observed. It proposes that an interlayer region ofy+.14 characterized by strong energy dependence of high linear slope occurs between innate near-wall structures in the underlying boundary layer flow and wall surface. It was suggested that this interlayer probably suppresses turbulence generation and self-sustaining process of the near-wall cycle. In addition, the conditional AM coefficients further manifests that the AM in the interlayer is insensitive to the condition of large-scale structures. |
| first_indexed | 2024-10-01T04:41:51Z |
| format | Journal Article |
| id | ntu-10356/105660 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:41:51Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1056602023-03-04T17:20:51Z Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition Tang, Zhanqi Jiang, Nan Zheng, Xiaobo Wu, Yanhua School of Mechanical and Aerospace Engineering Amplitude Modulation Boundary Layer Flow DRNTU::Engineering::Mechanical engineering This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuations acquired by triple decomposition were devoted to observing the AM effects. The PZT actuator has a significant impact on the distribution of AM coefficients and joint probability-density functions of large-scale fluctuations and the representatives of small scales in the inner region. Moreover, the energy dependence of small scales on large-scale structures was observed. It proposes that an interlayer region ofy+.14 characterized by strong energy dependence of high linear slope occurs between innate near-wall structures in the underlying boundary layer flow and wall surface. It was suggested that this interlayer probably suppresses turbulence generation and self-sustaining process of the near-wall cycle. In addition, the conditional AM coefficients further manifests that the AM in the interlayer is insensitive to the condition of large-scale structures. Published version 2019-06-13T06:05:13Z 2019-12-06T21:55:23Z 2019-06-13T06:05:13Z 2019-12-06T21:55:23Z 2019 Journal Article Tang, Z., Jiang, N., Zheng, X., & Wu, Y. (2019). Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition. Physics of Fluids, 31(2), 025120-. doi:10.1063/1.5083224 1070-6631 https://hdl.handle.net/10356/105660 http://hdl.handle.net/10220/48723 10.1063/1.5083224 en Physics of Fluids © 2019 The Author(s). All rights reserved. This paper was published by AIP Publishing in Physics of Fluids and is made available with permission of The Author(s). 14 p. application/pdf |
| spellingShingle | Amplitude Modulation Boundary Layer Flow DRNTU::Engineering::Mechanical engineering Tang, Zhanqi Jiang, Nan Zheng, Xiaobo Wu, Yanhua Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title | Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title_full | Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title_fullStr | Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title_full_unstemmed | Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title_short | Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| title_sort | local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition |
| topic | Amplitude Modulation Boundary Layer Flow DRNTU::Engineering::Mechanical engineering |
| url | https://hdl.handle.net/10356/105660 http://hdl.handle.net/10220/48723 |
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