Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations
As high-pressure-turbines operate at extreme temperature conditions, base bleed can be applied at the trailing edge of the airfoils, enhancing the thermal protection along the trailing edge surface, but also disrupting the trailing edge flow and altering the overall aerodynamic pressure losses. The...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/13/6760 |
| _version_ | 1827655360942440448 |
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| author | Carlos Carbajosa Alejandro Martinez-Cava Eusebio Valero Guillermo Paniagua |
| author_facet | Carlos Carbajosa Alejandro Martinez-Cava Eusebio Valero Guillermo Paniagua |
| author_sort | Carlos Carbajosa |
| collection | DOAJ |
| description | As high-pressure-turbines operate at extreme temperature conditions, base bleed can be applied at the trailing edge of the airfoils, enhancing the thermal protection along the trailing edge surface, but also disrupting the trailing edge flow and altering the overall aerodynamic pressure losses. The current work explores the potential use of base bleed as a flow control tool to modulate the flow between turbine blade rows. Through the numerical analysis of a symmetric airfoil immersed in a subsonic flow, the effects that trailing edge ejection has on the base region properties and the downstream flow are evaluated. In particular, previous research constrained to steady blowing is now extended to consider an unsteady pulsating base bleed injection. Three injection frequencies are investigated, covering a wide range of base bleed intensities. The results presented herein demonstrate that pulsating bleed flow is more efficient than its steady counterpart in terms of reducing pressure losses and controlling the primary frequency of the downstream oscillations for the same mass flow injection. |
| first_indexed | 2024-03-09T22:05:40Z |
| format | Article |
| id | doaj.art-800e827e2c3445b8b14f81e44b574a3c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:05:40Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-800e827e2c3445b8b14f81e44b574a3c2023-11-23T19:42:14ZengMDPI AGApplied Sciences2076-34172022-07-011213676010.3390/app12136760Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow ConfigurationsCarlos Carbajosa0Alejandro Martinez-Cava1Eusebio Valero2Guillermo Paniagua3Center of Computational Simulation, Universidad Politécnica de Madrid, Plaza Cardenal Cisneros 3, E-28040 Madrid, SpainInstituto Universitario de Microgravedad “Ignacio da Riva”, Universidad Politécnica de Madrid (IDR/UPM), E-28223 Madrid, SpainCenter of Computational Simulation, Universidad Politécnica de Madrid, Plaza Cardenal Cisneros 3, E-28040 Madrid, SpainMaurice J. Zucrow Laboratories, Purdue University, 500 Allison Road, West Lafayette, IN 47907-2014, USAAs high-pressure-turbines operate at extreme temperature conditions, base bleed can be applied at the trailing edge of the airfoils, enhancing the thermal protection along the trailing edge surface, but also disrupting the trailing edge flow and altering the overall aerodynamic pressure losses. The current work explores the potential use of base bleed as a flow control tool to modulate the flow between turbine blade rows. Through the numerical analysis of a symmetric airfoil immersed in a subsonic flow, the effects that trailing edge ejection has on the base region properties and the downstream flow are evaluated. In particular, previous research constrained to steady blowing is now extended to consider an unsteady pulsating base bleed injection. Three injection frequencies are investigated, covering a wide range of base bleed intensities. The results presented herein demonstrate that pulsating bleed flow is more efficient than its steady counterpart in terms of reducing pressure losses and controlling the primary frequency of the downstream oscillations for the same mass flow injection.https://www.mdpi.com/2076-3417/12/13/6760flow controlaerodynamicstrailing edge flowunsteady flow characteristicscomputational fluid dynamics |
| spellingShingle | Carlos Carbajosa Alejandro Martinez-Cava Eusebio Valero Guillermo Paniagua Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations Applied Sciences flow control aerodynamics trailing edge flow unsteady flow characteristics computational fluid dynamics |
| title | Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations |
| title_full | Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations |
| title_fullStr | Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations |
| title_full_unstemmed | Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations |
| title_short | Efficiency of Pulsating Base Bleeding to Control Trailing Edge Flow Configurations |
| title_sort | efficiency of pulsating base bleeding to control trailing edge flow configurations |
| topic | flow control aerodynamics trailing edge flow unsteady flow characteristics computational fluid dynamics |
| url | https://www.mdpi.com/2076-3417/12/13/6760 |
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