کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
655644 | 1457654 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fluid forces on a very low Reynolds number airfoil and their prediction Fluid forces on a very low Reynolds number airfoil and their prediction](/preview/png/655644.png)
This paper presents the measurements of mean and fluctuating forces on an NACA0012 airfoil over a large range of angle (α) of attack (0–90°) and low to small chord Reynolds numbers (Rec), 5.3 × 103–5.1 × 104, which is of both fundamental and practical importance. The forces, measured using a load cell, display good agreement with the estimate from the LDA-measured cross-flow distributions of velocities in the wake based on the momentum conservation. The dependence of the forces on both α and Rec is determined and discussed in detail. It has been found that the stall of an airfoil, characterized by a drop in the lift force and a jump in the drag force, occurs at Rec ⩾ 1.05 × 104 but is absent at Rec = 5.3 × 103. A theoretical analysis is developed to predict and explain the observed dependence of the mean lift and drag on α.
Journal: International Journal of Heat and Fluid Flow - Volume 32, Issue 1, February 2011, Pages 329–339