Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids
This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ϕ</mi><mo>=</mo...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-12-01
|
| Series: | International Journal of Turbomachinery, Propulsion and Power |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-186X/8/4/50 |
| _version_ | 1797380597900902400 |
|---|---|
| author | Benjamin J. Brimacombe James A. Scobie Joseph M. Flynn Carl M. Sangan Oliver J. Pountney |
| author_facet | Benjamin J. Brimacombe James A. Scobie Joseph M. Flynn Carl M. Sangan Oliver J. Pountney |
| author_sort | Benjamin J. Brimacombe |
| collection | DOAJ |
| description | This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ϕ</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0.3, 0.4, and 0.5) constructed from gyroid lattice structures. To the authors’ knowledge, this is the first use of a Triply Periodic Minimal Surface (TPMS) function to produce transpiration test coupons of varying porosity. Polymer gyroid lattice structures were successfully printed using Stereolithography (SLA) down to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ϕ</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0.3 for a print resolution of 25 microns and unit cell size of 2 mm. Cooling performance was measured in a small-scale wind tunnel. High-resolution Infrared Thermography was used to determine wall temperatures downstream of the porous section. When tested at both common blowing ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi></mrow></semantics></math></inline-formula> = 0.029, 0.048, and 0.062) and common injection ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi><mo> </mo></mrow></semantics></math></inline-formula>= 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi></mrow></semantics></math></inline-formula> but not for constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi></mrow></semantics></math></inline-formula>. Having determined <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi></mrow></semantics></math></inline-formula> as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature. |
| first_indexed | 2024-03-08T20:40:38Z |
| format | Article |
| id | doaj.art-36e259f523c24bbfb804181f475ca396 |
| institution | Directory Open Access Journal |
| issn | 2504-186X |
| language | English |
| last_indexed | 2024-03-08T20:40:38Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Turbomachinery, Propulsion and Power |
| spelling | doaj.art-36e259f523c24bbfb804181f475ca3962023-12-22T14:15:41ZengMDPI AGInternational Journal of Turbomachinery, Propulsion and Power2504-186X2023-12-01845010.3390/ijtpp8040050Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through GyroidsBenjamin J. Brimacombe0James A. Scobie1Joseph M. Flynn2Carl M. Sangan3Oliver J. Pountney4Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKDepartment of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKDepartment of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKDepartment of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKDepartment of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKThis paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ϕ</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0.3, 0.4, and 0.5) constructed from gyroid lattice structures. To the authors’ knowledge, this is the first use of a Triply Periodic Minimal Surface (TPMS) function to produce transpiration test coupons of varying porosity. Polymer gyroid lattice structures were successfully printed using Stereolithography (SLA) down to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ϕ</mi><mo>=</mo></mrow></semantics></math></inline-formula> 0.3 for a print resolution of 25 microns and unit cell size of 2 mm. Cooling performance was measured in a small-scale wind tunnel. High-resolution Infrared Thermography was used to determine wall temperatures downstream of the porous section. When tested at both common blowing ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi></mrow></semantics></math></inline-formula> = 0.029, 0.048, and 0.062) and common injection ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi><mo> </mo></mrow></semantics></math></inline-formula>= 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi></mrow></semantics></math></inline-formula> but not for constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi></mrow></semantics></math></inline-formula>. Having determined <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>F</mi></mrow></semantics></math></inline-formula> as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature.https://www.mdpi.com/2504-186X/8/4/50transpiration coolingperiodic porous structuresgyroidsadditive manufacturinginjection ratioeffective area |
| spellingShingle | Benjamin J. Brimacombe James A. Scobie Joseph M. Flynn Carl M. Sangan Oliver J. Pountney Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids International Journal of Turbomachinery, Propulsion and Power transpiration cooling periodic porous structures gyroids additive manufacturing injection ratio effective area |
| title | Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids |
| title_full | Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids |
| title_fullStr | Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids |
| title_full_unstemmed | Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids |
| title_short | Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids |
| title_sort | effect of porosity and injection ratio on the performance of transpiration cooling through gyroids |
| topic | transpiration cooling periodic porous structures gyroids additive manufacturing injection ratio effective area |
| url | https://www.mdpi.com/2504-186X/8/4/50 |
| work_keys_str_mv | AT benjaminjbrimacombe effectofporosityandinjectionratioontheperformanceoftranspirationcoolingthroughgyroids AT jamesascobie effectofporosityandinjectionratioontheperformanceoftranspirationcoolingthroughgyroids AT josephmflynn effectofporosityandinjectionratioontheperformanceoftranspirationcoolingthroughgyroids AT carlmsangan effectofporosityandinjectionratioontheperformanceoftranspirationcoolingthroughgyroids AT oliverjpountney effectofporosityandinjectionratioontheperformanceoftranspirationcoolingthroughgyroids |