JPS63199897U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図〜第５図は本考案実施の第１例を示すも
のであり、第６図は同じく実施第２例を示すもの
である。第１図は船尾フインを取り付けた場合の
流れの説明図、第２図は船尾フインを後方よりみ
た図、第３図は船尾フインの平面図、第４図は翼
断面形状が連続的に変化する台形フインの説明図
、第５図は翼断面形状が不連続的に変化する台形
フインの説明図、第６図は先端が円弧の船尾フイ
ンの平面図、第７〜第９図は船尾フインの取り付
け部に垂直な断面図である。また、第１０図は船
側からみた船尾の流れの説明図、第１１図は船長
に垂直な断面（第１０図中４）での流速、流向を
示す図、第１２図は下降流中におかれた翼素に働
く力と流れの様子の原理的説明図である。 図中１は船体、２は舵、３はプロペラ、４は船
長方向に垂直な断面、５は下降流、６は上昇流、
７は流れの等速度線、８はフインにより整流され
た流れ、９は代表的な翼素の断面、１０は船尾フ
イン、１１は船体中心線、１２はプロペラ円、Ｂ
は船尾フインの幅、Ｃは船尾フインの長さ、Ｄは
翼素に働く抗力、Ｆは翼素に働く合力、Ｌは翼素
に働く揚力、Ｔは翼素に働く推力、ｐ，ｑ，ｒ，
ｓはそれぞれフインの長さ方向に平行な断面、ｔ
は左右のフインが重なるために取り除かれる部分
、αは翼素の迎角、βはフインの開き角度を示す
。 1 to 5 show a first example of implementing the present invention, and FIG. 6 similarly shows a second example of implementing the invention. Figure 1 is an explanatory diagram of the flow when the stern fin is attached, Figure 2 is a view of the stern fin from the rear, Figure 3 is a plan view of the stern fin, and Figure 4 is a continuous change in the wing cross-sectional shape. Figure 5 is an explanatory diagram of a trapezoidal fin whose wing cross-sectional shape changes discontinuously. Figure 6 is a plan view of a stern fin with an arcuate tip. Figures 7 to 9 are a diagram of a stern fin. FIG. In addition, Figure 10 is an explanatory diagram of the flow at the stern as seen from the ship's side, Figure 11 is a diagram showing the flow velocity and flow direction in a cross section perpendicular to the ship's ship (4 in Figure 10), and Figure 12 is an illustration of the flow at the stern during downflow. FIG. 2 is a diagram illustrating the principle of the force acting on a bent blade element and the state of flow. In the figure, 1 is the hull, 2 is the rudder, 3 is the propeller, 4 is a cross section perpendicular to the ship's ship direction, 5 is a downward flow, 6 is an upward flow,
7 is the constant velocity line of the flow, 8 is the flow rectified by the fin, 9 is the cross section of a typical blade element, 10 is the stern fin, 11 is the hull center line, 12 is the propeller circle, B
is the width of the stern fin, C is the length of the stern fin, D is the drag force acting on the wing element, F is the resultant force acting on the wing element, L is the lift force acting on the wing element, T is the thrust force acting on the wing element, p, q, r,
s is a cross section parallel to the length direction of the fin, and t
is the portion that is removed because the left and right fins overlap, α is the angle of attack of the wing element, and β is the opening angle of the fins.

Claims (1)

【実用新案登録請求の範囲】 プロペラの前方で、かつ上方の船尾両舷に下記
構成の組合わせからなる翼形のフインを取付け、
船尾端における流れの剥離を防止して抵抗減少を
計るとともに船長方向以外の流れの成分を利用し
て推力を発生させ船舶の推進性能の向上を計るよ
うにした船尾フイン。 (1) 前記翼形のフインの後縁位置がプロペラ位
置からプロペラ直径の１０〜２０％前方にあり、
船体中心上での後縁高さがプロペラ上端位置を中
心にプロペラ直径の±１０％の範囲内にあること
。 (2) 前記翼形のフインの船体取り付け部に垂直
な断面形状が、上面は直線、下面は直線、多角形
の一部または円弧で構成され、該上面と鉛直線の
なす角度が４５度〜７５度の範囲内にあること。 (3) 前記翼形のフインの船体取り付け部に平行
な断面形状がいわゆる翼断面（エアロフオイル断
面）で、その断面の前縁と後縁を結ぶ線が水平と
なす角度が船体取り付け部から先端にかけて水流
の向きに応じて変化するとともに、船体取り付け
部では下に凸のキヤンバーを持ち、中間部で反転
し、先端部で逆に上に凸のキヤンバーを持つこと
。[Claims for Utility Model Registration] Airfoil-shaped fins consisting of the combination of the following configurations are installed in front of the propeller and on both sides of the stern above,
A stern fin that prevents flow separation at the stern end to reduce resistance, and also generates thrust by utilizing flow components other than the ship's ship direction, improving the ship's propulsion performance. (1) The trailing edge position of the airfoil-shaped fin is located 10 to 20% forward of the propeller diameter from the propeller position,
The height of the trailing edge above the center of the hull must be within ±10% of the propeller diameter around the top of the propeller. (2) The cross-sectional shape of the airfoil-shaped fin perpendicular to the hull attachment part is composed of a straight line on the upper surface, a straight line on the lower surface, a part of a polygon, or a circular arc, and the angle between the upper surface and the vertical line is 45 degrees or more. Must be within 75 degrees. (3) The cross-sectional shape of the airfoil-shaped fin parallel to the hull attachment part is the so-called airfoil cross section (aerofoil cross section), and the angle that the line connecting the leading edge and the trailing edge of that cross section makes with the horizontal is from the hull attachment part. It changes according to the direction of the water flow towards the tip, has a downwardly convex camber at the hull attachment point, reverses at the middle, and conversely has an upwardly convex camber at the tip.