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Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω
á à Á À é è É È ç Ç ê
Ä Ö Ü ä ö ü ß
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‘ ’ “ ” 〔 〕 〈 〉 「 」 『 』 【 】 ＂ （ ） ［ ］ ｛ ｝
± × ÷ ≠ ≤ ≥ ∞ ∴ ♂ ♀ ∠ ⊥ ⌒ ∂ ∇ ≡ ≒ ≪ ≫ √ ∽ ∝ ∵ ∫ ∬ ∈ ∋ ⊆ ⊇ ⊂ ⊃ ∪ ∩ ∧ ∨ ￢ ⇒ ⇔ ∀ ∃ ∮ ∑ ∏ ＋ － ＜ ＝ ＞
、 。 · ‥ … ¨ 〃 ― ∥ ＼ ∼ ´ ～ ˇ ˘ ˝ ˚ ˙ ¸ ˛ ¡ ¿ ː ！ ＇ ， ． ／ ： ； ？ ＾ ＿ ｀ ｜
½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞ ¹ ² ³ ⁴ ⁿ ₁ ₂ ₃ ₄
Æ Ð Ħ IJ Ł Ø Œ Þ Ŧ Ŋ æ đ ð ħ ı ij ĸ ŀ ł ø œ ß þ ŧ ŋ ʼn
А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ ы ь э ю я
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§ ※ ☆ ★ ○ ● ◎ ◇ ◆ □ ■ △ ▽ → ← ↑ ↓ ↔ 〓 ◁ ◀ ▷ ▶ ♤ ♠ ♡ ♥ ♧ ♣ ⊙ ◈ ▣ ◐ ◑ ▒ ▤ ▥ ▨ ▧ ▦ ▩ ♨ ☏ ☎ ☜ ☞ † ‡ ↕ ↗ ↙ ↖ ↘ ♭ ♩ ♪ ♬ ㉿ ㈜ № ㏇ ™ ㏂ ㏘ ℡ ＃ ＆ ＊ ＠ ª º
ⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹ Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ
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      When an appendage like a wing or fin is attached on the main body, horseshoe vortices are formed at the junction between the appendage and body. This vortical structure is known to increase drag force and heat transfer. Thus, controlling this horseshoe vortex is an important issue in many engineering system. On the other hand, most nature’s wings and fins have leading-edge fillets (LEF) and they are known to be one of the devices to control the horseshoe vortices. Therefore, in the present study, we measure the drag forces of Rood wing (3:2 elliptical nose with NACA0020 tail joined at maximum thickness) mounted on a flat plate, with and without LEF at Re = 100,000 ~ 150,000 based on the maximum thickness of wing and free stream velocity. We consider total 25 different LEFs: 14 pyramid LEFs and 11 curved LEFs, respectively. The height and length of the LEF are varied according to the boundary layer thickness. In the present parametric study, we obtain maximum 7% drag reduction by LEF.
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      When an appendage like a wing or fin is attached on the main body, horseshoe vortices are formed at the junction between the appendage and body. This vortical structure is known to increase drag force and heat transfer. Thus, controlling this horsesho...

      When an appendage like a wing or fin is attached on the main body, horseshoe vortices are formed at the junction between the appendage and body. This vortical structure is known to increase drag force and heat transfer. Thus, controlling this horseshoe vortex is an important issue in many engineering system. On the other hand, most nature’s wings and fins have leading-edge fillets (LEF) and they are known to be one of the devices to control the horseshoe vortices. Therefore, in the present study, we measure the drag forces of Rood wing (3:2 elliptical nose with NACA0020 tail joined at maximum thickness) mounted on a flat plate, with and without LEF at Re = 100,000 ~ 150,000 based on the maximum thickness of wing and free stream velocity. We consider total 25 different LEFs: 14 pyramid LEFs and 11 curved LEFs, respectively. The height and length of the LEF are varied according to the boundary layer thickness. In the present parametric study, we obtain maximum 7% drag reduction by LEF.

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      목차 (Table of Contents)

      • Abstract
      • 1. 서론
      • 2. 실험 장치 및 구성
      • 3. 실험 결과
      • 4. 결론
      • Abstract
      • 1. 서론
      • 2. 실험 장치 및 구성
      • 3. 실험 결과
      • 4. 결론
      • 후기
      • 참고문헌
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