The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles

Year 2018, Volume: 2 Issue: 4, 224 - 237, 31.12.2018

Abdulhalim Aşkan , Selim Tangöz

https://doi.org/10.30521/jes.454215

Cited By: 3

Abstract

In this study the impact
of aspect ratio on the aerodynamic performances and flow separation behavior
were investigated on a model wing made up four different profiles used to the
wing of the Boeing 737-Classic aircrafts. The experiments were carried out in a
wind tunnel with low speed at different angles of attack ranging from -4° to
40° and at the 200,000 Reynolds number on wing models having different aspect
ratios (0.7-1.3).

It was observed from the experiments and
numerical studies that the changing of the aspect ratio affected the drag and
lift and flow separation. The highest lift/drag ratio has been measured from
the wing having aspect ratio of 1.3 at angle of attack of 70. Moreover,
the airflow was flowed as laminar in the areas near the middle of the wing until
angle of attack of 240. But, the flow was disturbed at wing tip due
to vortex. The separation bubbles have been seen at 24°-320 for all aspect
ratios. In addition, the increase of angle of attack caused the bubbles form
clearly for 1.1 and 1.3 aspect ratios. Finally, the increases in aspect ratio
and in angle of attack have been triggered flow separation.

Keywords

Different profiles, Aspect ratio, Flow separation

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