Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade
To control the flow separation in the compressors, a novel pulsed jet concept without external energy injection is proposed. The new concept designs a slot in the middle of the blade and sets a micro device to switch the slot periodically. Such a structure is expected to generate a pulsed jet by the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/10/12/2004 |
| _version_ | 1798038319030861824 |
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| author | Jie Chen Weiyu Lu Guoping Huang Jianfeng Zhu Jinchun Wang |
| author_facet | Jie Chen Weiyu Lu Guoping Huang Jianfeng Zhu Jinchun Wang |
| author_sort | Jie Chen |
| collection | DOAJ |
| description | To control the flow separation in the compressors, a novel pulsed jet concept without external energy injection is proposed. The new concept designs a slot in the middle of the blade and sets a micro device to switch the slot periodically. Such a structure is expected to generate a pulsed jet by the pressure difference between the pressure side and the suction side of the blade. In order to analyze the interaction between the pulsed jet and unsteady separated flow, our numerical and experimental study is based on a specific cascade (with a flow separation inside) and a pulsed jet (one of the unsteady flow control method). The experimental and numerical results both show that when the frequency of pulsed jet is approximate to that of the separation vortex, then the control tends to be more effective. Based on the numerical simulations, the proper orthogonal decomposition (POD) is then used to reveal the control mechanism, extracting the different time-space structures from the original field. The results with the aid of POD show that the pulsed jet can redistribute the kinetic energy of each mode, and strengthen or weaken certain modes, particularly, while the steady jet reduces the kinetic energy of high-order modes in whole. Also, pulsed jet with proper parameters can transfer the energy from higher modes to the first flow mode (averaged flow), which is due to the conversion of the spatial vortical structures and the time evolution of the modes. |
| first_indexed | 2024-04-11T21:38:34Z |
| format | Article |
| id | doaj.art-662a1be0645f4c4d9d6445fce3f02303 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T21:38:34Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-662a1be0645f4c4d9d6445fce3f023032022-12-22T04:01:40ZengMDPI AGEnergies1996-10732017-12-011012200410.3390/en10122004en10122004Research on Pulsed Jet Flow Control without External Energy in a Blade CascadeJie Chen0Weiyu Lu1Guoping Huang2Jianfeng Zhu3Jinchun Wang4Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaJiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaTo control the flow separation in the compressors, a novel pulsed jet concept without external energy injection is proposed. The new concept designs a slot in the middle of the blade and sets a micro device to switch the slot periodically. Such a structure is expected to generate a pulsed jet by the pressure difference between the pressure side and the suction side of the blade. In order to analyze the interaction between the pulsed jet and unsteady separated flow, our numerical and experimental study is based on a specific cascade (with a flow separation inside) and a pulsed jet (one of the unsteady flow control method). The experimental and numerical results both show that when the frequency of pulsed jet is approximate to that of the separation vortex, then the control tends to be more effective. Based on the numerical simulations, the proper orthogonal decomposition (POD) is then used to reveal the control mechanism, extracting the different time-space structures from the original field. The results with the aid of POD show that the pulsed jet can redistribute the kinetic energy of each mode, and strengthen or weaken certain modes, particularly, while the steady jet reduces the kinetic energy of high-order modes in whole. Also, pulsed jet with proper parameters can transfer the energy from higher modes to the first flow mode (averaged flow), which is due to the conversion of the spatial vortical structures and the time evolution of the modes.https://www.mdpi.com/1996-1073/10/12/2004compressorpulsed jetflow separationflow control |
| spellingShingle | Jie Chen Weiyu Lu Guoping Huang Jianfeng Zhu Jinchun Wang Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade Energies compressor pulsed jet flow separation flow control |
| title | Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade |
| title_full | Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade |
| title_fullStr | Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade |
| title_full_unstemmed | Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade |
| title_short | Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade |
| title_sort | research on pulsed jet flow control without external energy in a blade cascade |
| topic | compressor pulsed jet flow separation flow control |
| url | https://www.mdpi.com/1996-1073/10/12/2004 |
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