Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow
Cavity flows have a wide range of low-speed applications (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi><mo>≤</mo><mn>0.3</mn></mrow></semantics>...
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2024-12-01
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| author | Naser Al Haddabi Konstantinos Kontis Hossein Zare-Behtash |
| author_facet | Naser Al Haddabi Konstantinos Kontis Hossein Zare-Behtash |
| author_sort | Naser Al Haddabi |
| collection | DOAJ |
| description | Cavity flows have a wide range of low-speed applications (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi><mo>≤</mo><mn>0.3</mn></mrow></semantics></math></inline-formula>), such as aircraft wheel wells, ground transportations, and pipelines. They induce strong flow oscillations which can substantially increase noise, drag, vibration, and lead to structural fatigue. In the current study, a steady jet was forced from the cavity trailing edge with different momentum fluxes (<i>J</i> = 0.11 kg/m·s<sup>2</sup>, 0.44 kg/m·s<sup>2</sup>, and 0.96 kg/m·s<sup>2</sup>). The aim of this study was to investigate the impact of the steady jet on the time-averaged flow field and the cavity separated shear layer oscillations for an open cavity with a length-to-depth ratio of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><mo>/</mo><mi>D</mi><mo>=</mo><mn>4</mn></mrow></semantics></math></inline-formula> at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><msub><mi>e</mi><mi>θ</mi></msub><mo>=</mo><mn>1.28</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>. Particle image velocimetry, surface oil flow visualisation, constant temperature anemometry, and pressure measurements were performed. The study found that increasing the jet momentum flux caused a significant increase in thickness and deflection of the cavity separated shear layer. Due to the counterflow interaction between the jet and cavity separated shear layer, the growth rate (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>δ</mi><mi>ω</mi></msub><mo>/</mo><mi>d</mi><mi>x</mi></mrow></semantics></math></inline-formula>) of the cavity separated shear layer increased significantly from 0.193 for the no-jet case to 0.273 for the <i>J</i> = 0.96 kg/m·s<sup>2</sup> case. As a result, the return flow rate increased, causing the separation point on the cavity floor to shift upstream from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>/</mo><mi>L</mi><mo>≈</mo><mn>0.2</mn></mrow></semantics></math></inline-formula> for the no-jet case to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>/</mo><mi>L</mi><mo>≈</mo><mn>0.1</mn></mrow></semantics></math></inline-formula> for the <i>J</i> = 0.96 kg/m·s<sup>2</sup> case. Furthermore, increasing the jet momentum flux increased the broadband level of the cavity separated shear layer oscillations. |
| format | Article |
| id | doaj-art-eeaef1a1de364aec8cbfc0efaefc7856 |
| institution | Kabale University |
| issn | 2226-4310 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj-art-eeaef1a1de364aec8cbfc0efaefc78562025-01-24T13:15:25ZengMDPI AGAerospace2226-43102024-12-01121710.3390/aerospace12010007Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity FlowNaser Al Haddabi0Konstantinos Kontis1Hossein Zare-Behtash2College of Engineering and Technology, University of Technology and Applied Sciences, P.O. Box 191, Al Musannah PC 314, OmanJames Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UKSchool of Engineering, University of Southampton, Southampton SO17 1BJ, UKCavity flows have a wide range of low-speed applications (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi><mo>≤</mo><mn>0.3</mn></mrow></semantics></math></inline-formula>), such as aircraft wheel wells, ground transportations, and pipelines. They induce strong flow oscillations which can substantially increase noise, drag, vibration, and lead to structural fatigue. In the current study, a steady jet was forced from the cavity trailing edge with different momentum fluxes (<i>J</i> = 0.11 kg/m·s<sup>2</sup>, 0.44 kg/m·s<sup>2</sup>, and 0.96 kg/m·s<sup>2</sup>). The aim of this study was to investigate the impact of the steady jet on the time-averaged flow field and the cavity separated shear layer oscillations for an open cavity with a length-to-depth ratio of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><mo>/</mo><mi>D</mi><mo>=</mo><mn>4</mn></mrow></semantics></math></inline-formula> at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><msub><mi>e</mi><mi>θ</mi></msub><mo>=</mo><mn>1.28</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>. Particle image velocimetry, surface oil flow visualisation, constant temperature anemometry, and pressure measurements were performed. The study found that increasing the jet momentum flux caused a significant increase in thickness and deflection of the cavity separated shear layer. Due to the counterflow interaction between the jet and cavity separated shear layer, the growth rate (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><msub><mi>δ</mi><mi>ω</mi></msub><mo>/</mo><mi>d</mi><mi>x</mi></mrow></semantics></math></inline-formula>) of the cavity separated shear layer increased significantly from 0.193 for the no-jet case to 0.273 for the <i>J</i> = 0.96 kg/m·s<sup>2</sup> case. As a result, the return flow rate increased, causing the separation point on the cavity floor to shift upstream from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>/</mo><mi>L</mi><mo>≈</mo><mn>0.2</mn></mrow></semantics></math></inline-formula> for the no-jet case to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>x</mi><mo>/</mo><mi>L</mi><mo>≈</mo><mn>0.1</mn></mrow></semantics></math></inline-formula> for the <i>J</i> = 0.96 kg/m·s<sup>2</sup> case. Furthermore, increasing the jet momentum flux increased the broadband level of the cavity separated shear layer oscillations.https://www.mdpi.com/2226-4310/12/1/7cavity flowaerospaceflow control |
| spellingShingle | Naser Al Haddabi Konstantinos Kontis Hossein Zare-Behtash Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow Aerospace cavity flow aerospace flow control |
| title | Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow |
| title_full | Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow |
| title_fullStr | Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow |
| title_full_unstemmed | Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow |
| title_short | Experimental Study of Steady Blowing from the Trailing Edge of an Open Cavity Flow |
| title_sort | experimental study of steady blowing from the trailing edge of an open cavity flow |
| topic | cavity flow aerospace flow control |
| url | https://www.mdpi.com/2226-4310/12/1/7 |
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