本文主要以實驗方法探討導緣突節外型對翼形表面流場結構及性能之影響，在過去的研究中對於導緣突節設計之特性主要分成兩部分討論：三維鰭狀肢及二維矩形翼，不過大部分都是在探討翼型性能的改善及變化，對於導緣突節如何改變流場結構進而使性能提升並沒有完全的瞭解，故本研究以NACA0012做為實驗之翼型，設計三種不同振幅之導緣突節，於空蝕水槽中進行翼型性能實驗，再藉由PTV及油墨可視化之方法，探討突節設計對於流場結構及性能的變化，並額外考量一側靠wall之影響。
根據性能實驗結果顯示，升力係數明顯下降，阻力卻有顯著的改善，尤其是振幅最大的NACA0012L，對於性能提升效果為最佳。比較無突節翼型與突節翼型之可視化結果發現突節波谷產生的渦流雖然減少了表面的附著流，使整體升力下降，但卻能延緩邊界層分離的發生，使阻力獲得改善，並保持升力使失速攻角延後，且這個渦流能在後失速區吸引部分已經分離的流場重新附著回表面，這個特性能使後失速區的升力獲得改善。

In this study, experiments were conducted to investigate the effects of leading -edge tubercles on the flow structure and performance of foil surfaces. Previous studies have discussed the 3D flipper and 2D rectangular foil designs of leading-edge tubercles. However, most of them have focused on the improvement of foil performance, and not on how leading-edge tubercles alter flow structures to enhance airfoil performance. Therefore, this study adopted the NACA0012 to design three types of leading-edge tubercles with distinct amplitudes. The developed tubercles were tested in a cavitation tank to assess the performance of the foil. Subsequently, particle tracking velocimetry and ink visualization methods were used to investigate the changes in the flow structure and performance of foils with the designed tubercles, as well as the effects of a side wall on the tubercles.
According to the performance test results, the foil lift coefficient decreased substantially, and the drag improved significantly. Specifically, the performance of the NACA0012L with the largest amplitude improved considerably. A comparison of the visualization results of the foils with and without tubercles revealed that the vortex generated in the tubercle trough reduced the surface-attached flow, thereby decreasing the lift force. However, the vortex could delay the separation of the boundary layer, increasing the drag and maintaining the lift force at a level that influences the stalling angle of attack. Moreover, it could attract a portion of the separated flow in the post-stall region and reattach it to the surface. These characteristics can improve the lift force in the post-stall region.

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