### Abstract

Original language | English |
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Publication status | Published - 2008 |

Event | 8th AIAA Aviation Technology, Integration and Operations (ATIO) Conference, September 14, 2008 - September 19, 2008 - Anchorage, AK, USA United States Duration: 14 Sep 2008 → 19 Sep 2008 |

### Conference

Conference | 8th AIAA Aviation Technology, Integration and Operations (ATIO) Conference, September 14, 2008 - September 19, 2008 |
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Country | USA United States |

City | Anchorage, AK |

Period | 14/09/08 → 19/09/08 |

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### Cite this

*An experimental and computational study of low Re number transitional flows over an aerofoil with leading edge slat*. Paper presented at 8th AIAA Aviation Technology, Integration and Operations (ATIO) Conference, September 14, 2008 - September 19, 2008, Anchorage, AK, USA United States.

**An experimental and computational study of low Re number transitional flows over an aerofoil with leading edge slat.** / Genc, M Serdar; Lock, Gary; Kaynak, Unver.

Research output: Contribution to conference › Paper

}

TY - CONF

T1 - An experimental and computational study of low Re number transitional flows over an aerofoil with leading edge slat

AU - Genc, M Serdar

AU - Lock, Gary

AU - Kaynak, Unver

PY - 2008

Y1 - 2008

N2 - In this study, a multi-element aerofoil including NACA2415 aerofoil with NACA22 leading edge slat is experimentally and computationally investigated at a transitional Reynolds number of 2105. In the experiment, the single-element aerofoil experiences a laminar separation bubble, and a maximum lift coefficient of 1.3 at a stall angle of attack of 12. This flow has been numerically simulated by FLUENT, employing the recently developed, k-k L- and k- SST transition models. Both transition models are shown to accurately predict the location of the experimentally determined separation bubble. Experimental measurements illustrate that the leading-edge slat significantly delays the stall to an angle of attack of 20, with a maximum lift coefficient of 1.9. The fluid dynamics governing this improvement is the elimination of the separation bubble by the injection of high momentum fluid through the slat over the main aerofoil - an efficient means of flow control. Numerical simulations using the k-kL- transition model are shown to accurately predict the lift curve, including stall, but not the complete elimination of the separation bubble. Conversely, the lift curve prediction using the k- SST transition model is less successful, but the separation bubble is shown to fully vanish in agreement with the experiment.

AB - In this study, a multi-element aerofoil including NACA2415 aerofoil with NACA22 leading edge slat is experimentally and computationally investigated at a transitional Reynolds number of 2105. In the experiment, the single-element aerofoil experiences a laminar separation bubble, and a maximum lift coefficient of 1.3 at a stall angle of attack of 12. This flow has been numerically simulated by FLUENT, employing the recently developed, k-k L- and k- SST transition models. Both transition models are shown to accurately predict the location of the experimentally determined separation bubble. Experimental measurements illustrate that the leading-edge slat significantly delays the stall to an angle of attack of 20, with a maximum lift coefficient of 1.9. The fluid dynamics governing this improvement is the elimination of the separation bubble by the injection of high momentum fluid through the slat over the main aerofoil - an efficient means of flow control. Numerical simulations using the k-kL- transition model are shown to accurately predict the lift curve, including stall, but not the complete elimination of the separation bubble. Conversely, the lift curve prediction using the k- SST transition model is less successful, but the separation bubble is shown to fully vanish in agreement with the experiment.

M3 - Paper

ER -