When we increase the Reynolds number in the context of fluid dynamics and aerodynamics, several effects can occur. The following statements may be correct:
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Transition moves towards the trailing edge of the wing: This is generally true. As the Reynolds number increases, the flow tends to remain attached to the surface of the wing for a longer distance, delaying transition from laminar to turbulent flow. This often results in the transition moving towards the trailing edge.
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The maximum lift coefficient increases: This is also generally true. With higher Reynolds numbers, the airfoil can generate more lift due to improved flow characteristics, including potentially delayed flow separation.
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The angle of attack for which the maximum lift coefficient is reached, increases: This statement can be true in some cases. Higher Reynolds numbers may allow the airfoil to sustain higher angles of attack before stalling, but the relationship can also be complex and dependent on the specific airfoil shape and conditions.
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The drag decreases: Not mentioned explicitly, but it might be considered under certain conditions. As the Reynolds number increases, the flow becomes more turbulent, which can lead to lower skin friction drag, but the overall drag characteristics can be influenced by other factors (like form drag) as well.
Overall, the most universally accepted effects of increasing the Reynolds number involve enhanced lift generation and changes in the flow attachment behavior which can shift the transition point and influence the maximum lift characteristics of a wing.
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