סמינר מחלקה של מעיין פוסטי - בקרה אקטיבית על ניתוק זרימה מקומי המושפע מאזור צומת הכנף-מנוע-כנפון קדמי

School of Mechanical Engineering Seminar
Wednesday, November 23, 2022 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Active control of Wing-Engine-Slat cut-out Region flow separation 

Maayan Possti

 MSc. of Avi Seifert

Fossil fuel is the most common energy source used to power aircraft and as a result, its engines emit polluting gases that also contribute to global warming. One possible remedy is increasing the bypass ratio and lowering the fan pressure ratio of turbofan aircraft engine, reducing the fuel consumption for the same thrust. Ultra-High Bypass Ratio (UHBR) engines are very effective from the fuel consumption aspect and therefore have great potential in civil aviation. On the other hand, the engine's very large diameter leads to a challenging integration with the aircraft wing. This assembly requires a slat-cut-out in the area where the engine is connected. This in turn causes local boundary layer flow separation. This study is focused on establishing the baseline flow of the small scaled model based on the DLR-F15 airfoil. Also, to apply active flow control (AFC) method in a form of steady suction in order to enhance lift and increase stall angle. The first part of the study includes the complex design and manufacturing of the small-scale model constructed out of the main element wing, two parts-slat, flap and an engine. The second part deals with investigating the baseline flow of the small-scale model and finding if it corresponds well to CFD simulations performed under the same conditions. This part was conducted at the TAU closed-loop low-speed wind-tunnel (WT), combining surface pressures and near-wake measurements. The last and final part of this study was the application of steady suction from two rows of suction holes located in the separation prone region. Testing was conducted at low Reynolds numbers with different configurations of the suction holes and suction magnitudes. All of the WT experiments were performed at a free-stream velocity of 25m/s correspond to Reynolds number of 640k, based on an average chord (including flap and slat) is 430 mm. It was found that applying steady suction leads to a significant improvement in terms of the lift coefficient.

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https://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09