LEADING EDGE EXTENSIONS (LEX) EFFECT TO AERODYNAMICS CHARACTERISTIC FIGHTER AIRCRAFT AT HIGH ANGLE OF ATTACK (CASE STUDY:ANALYSIS USING WATER TUNNEL TEST)
The ability to design the newest generation of fighter aircraft which has high agility in its maneuvers has become essential between fighter aircraft producer countries globally. Since it is important to ensure the aircraft’s agility, producers must take concerns in the aerodynamic characteristic...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/49224 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The ability to design the newest generation of fighter aircraft which has high
agility in its maneuvers has become essential between fighter aircraft producer
countries globally. Since it is important to ensure the aircraft’s agility, producers
must take concerns in the aerodynamic characteristics of the aircraft at high
angle of attack (AoA). There are plenty of the previous studies that tried to
evaluate the aerodynamic characteristics in fighter aircraft using Computational
Fluid Dyanamic (CFD), wind tunnel, water tunnel, or flight test that became the
basis of this study.
This study analyzed aerodynamic characteristics of the aircraft at high AoA using
water tunnel test compared to the result of wind tunnel test for several
configurations of the XF-103 models. The research conducted in this study was
focused on the lateral directional characteristics and flow visualization. Wind
tunnel test data has shown an unstable indication on high AoA maneuver.
Improvement of configuration should be done to get optimum aerodynamic
characteristics. Literature review was conducted to build a basic understanding
on the idea, including the vortex shape.
In this study, an analysis of the changes in the shape of the forebody leading edge
(LEX) was analyzed with 3 kinds of geometric shapes, namely LEX#1, LEX#2 and
LEX#3. The analysis is based on wind tunnel and water tunnel test data, including
observations of the type of flow and shape of the vortex. In the water tunnel test,
satisfactory results were obtained. Those LEX configurations greatly affected the
quality of the forebody flow. Analysis of the test results of the three LEX shapes
shows that there is an improvement in stability, especially in LEX # 3. Likewise,
the results of flow visualization observations, vortex breakdown is more delayed
than the basic configuration. Thus it can be concluded that the LEX#3
configuration improves maneuverability at high angles of attack |
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