Experimental and Numerical Investigation of Aerodynamic Performance of a Star-Shaped Damaged Wing

In this paper the flow on a finite wing with star damage is numerically and experimentally investigated to understand the influences of damage on the aerodynamic characteristics of wing. To study the effects of different span positions, the damage was considered in tip, middle and root position of the wing span. The wing model of studies is a section of NACA 641-412 asymmetric airfoil with 200mm chord and 800mm span. The aerodynamic coefficients and their increments due to damage were extracted and the results were compared to each other and also to the experimental results. The flow visualization of flow over the damaged wing has been done with pain technique to make evident the flow structure on the model and to understand the influences of damage on the flow. For better understanding of the ability of numerical modeling prediction of aerodynamic performance of a damaged wing, the flow around the wing was numerically analyzed and was validated with the experimental results. A star damage with area about 1% of the wing, can decrease the lift coefficient about 6% and increase the drag coefficient about 15.7% compared with undamaged wing. The star damaged wing also experiences more negative pitching moment coefficient. The results of damage in different locations showed that the damage near to wing tip has less impact on decrement of aerodynamic efficiency.
For better understanding of the ability of numerical modeling prediction of aerodynamic performance of a damaged wing, the flow around the wing was numerically analyzed and was validated with the experimental results. A star damage with area about 1% of the wing, can decrease the lift coefficient about 6% and increase the drag coefficient about 15.7% compared with undamaged wing. The star damaged wing also experiences more negative pitching moment coefficient. The results of damage in different locations showed that the damage near to wing tip has less impact on decrement of aerodynamic efficiency.