JPS60240802A - Sectional shape along fluid flow of aerofoil for obtaining lift from fluid, vane of propeller or screw for obtaining thrust from fluid and vane of fan for moving fluid, etc. - Google Patents

Abstract

PURPOSE:To obtain lift or thrust with high efficiency, by forming a sectional shape of various vanes along a fluid flow into a parabolic curve wherein a front surface of the vane against the fluid flow has a large curvature at its front side and a chord is directed to the inside, while a back surface has a small curvature at its front side. CONSTITUTION:A sectional shape of the above-captioned vanes along a fluid flow (aerofoil section) is formed into a parabolic curve such that a front surface 1 against the fluid flow has a large curvature at its front side and a chord is directed to the inside, while a back surface 2 has a small curvature at its front side and a chord is directed to the inside. A front end of the back surface 2 and a rear end of the front surface 1 are so arranged as to be tangential with the fluid flow, so that the fluid flow against the front surface 1 may be rapidly changed downwardly at the large curvature front portion. Then, a pressure wave of the fluid is sufficiently diffused at the small curvature portion so as not to be stayed at the rear end.

Description

【発明の詳細な説明】 本発明は、流体から揚力を得るための翼および流体から
推力を得るためのプロペラやスクリュウの羽根ならびに
流体を移動させるためのファンの羽根等の流体方向の断
面の形（以下「翼形」とし・う）で、その効率をよくす
るため、流体に対する前面（１）は−面出のす戎なＪＴ
小前りこ１．　枯木内側に向けた放物線状とし、背面（
２）は反対に、曲率の小さな方を前にし、弦を内側に向
けた放物線状とするもので、この翼形の背面（２）の先
端部分と、前面（１）の後端部分が、流体の方向と切線
で接するように設置することにより、前面（１）に対す
る流体は、曲率の大きな前の部分で一気に下方（図面の
手前を「下」として説明する）にその方向を変えられ、
以後翼形はだんだん曲率が小さくなるので流体の方向変
更度も少なくなり後端部分ではその方向変更はほとんど
なくなる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-sectional shape in the fluid direction of blades for obtaining lift from a fluid, blades of a propeller or screw for obtaining thrust from a fluid, and blades of a fan for moving a fluid. (hereinafter referred to as "airfoil shape"), and in order to improve its efficiency, the front surface (1) facing the fluid is a large JT with a -surface.
Riko Komae 1. Shape a parabola toward the inside of the dead tree, with the back (
2), on the other hand, is a parabola with the smaller curvature facing forward and the chord facing inward; the tip of the back (2) of this airfoil and the rear end of the front (1) are By installing it so that it touches the direction of the fluid at a tangential line, the direction of the fluid toward the front surface (1) can be suddenly changed downward (the front side of the drawing is referred to as "down") at the front part where the curvature is large.
Thereafter, the curvature of the airfoil gradually decreases, so the degree of fluid direction change decreases, and the direction change almost disappears at the rear end.

このようにして前の部分で大きく方向を変えられた流体
の圧力波が、曲率の小さな部分で充分拡散し、後端部分
へその圧力を残さないようにし、後端部分を通り過ぎた
とき、背面（２）方向への巻き返しを少なくし、大量の
流体が少ない抵抗で下方へ方向変更し、その反力で効率
のよい揚力や推力が得られるようにしたものである。従
来の翼形の前面は直線的で後端部分までほぼ同一の仰角
が続くため、流体の方向変更は後端まで続き、その圧力
波はだんだん蓄積し後端部分て最大となる−そのため流
体は後端を通り過ぎた瞬間、負圧となっている背面方向
へ一気に巻き返し、流体の方向が上向きその反力で揚力
や推力が相殺され、また流体の速度も遅れるので抵抗が
大きくなるもので、本翼形の前面（１）ではこのような
欠点を少な（するものである。また背面（２）において
は、流体をなめらかに翼形に添って下方に方向を変更さ
せ、その反力として効率のよい揚力や推力を得るために
、曲率の小さな方を前にし弦を内側に向けた放物線状と
したもので、流体の方向を変更させるのに、はじめはゆ
るやかに、だんだん変更の度合を多くし流体の加速度を
利用して方向を変更させ、流体が翼形から離脱しようと
するためにできる渦流を防ぎ、渦流による流体の速度の
遅れにともなう抵抗を少なくし、流体をなめらかに下方
に方向変更させ、その反力で効率のよい揚力や推力が得
られるものである一８従来の翼形の背面は、前の部分に
大きな曲率のふくらみ部分があるため流体は一旦上方に
方向を変えられさらに下方へ、曲率の大きな部分で方向
変更を迫られるため翼形への追従が悪くなり渦流を生じ
やす（、そのため速度も遅れて抵抗となるもので、本翼
形の背面（２）はこのような欠点を少なくするものであ
る。In this way, the pressure waves of the fluid whose direction is largely changed in the front part are sufficiently diffused in the small curvature part, so that the pressure does not remain in the rear end part, and when it passes the rear end part, (2) Recurrence in the direction is reduced, a large amount of fluid is directed downward with little resistance, and the reaction force is used to generate efficient lift and thrust. Since the front face of a conventional airfoil is straight and the angle of elevation continues to be almost the same all the way to the trailing edge, the fluid direction change continues all the way to the trailing edge, and the pressure waves gradually accumulate and reach a maximum at the trailing edge - so the fluid The moment it passes the rear end, the fluid suddenly rolls back toward the back, where there is negative pressure, and the direction of the fluid turns upward, canceling out the lift and thrust forces, and also slowing down the speed of the fluid, which increases the resistance. The front side (1) of the airfoil shape minimizes these drawbacks.The back side (2) allows the fluid to smoothly change direction downward along the airfoil shape, and as a reaction force, increases efficiency. In order to obtain good lift and thrust, it is shaped like a parabola with the side with the smaller curvature facing forward and the string facing inward.The direction of the fluid is changed slowly at first, and then the degree of change gradually increases. Changes the direction by using the acceleration of the fluid, prevents the vortex that is created when the fluid tries to leave the airfoil, reduces the resistance caused by the slowing of the fluid due to the vortex, and smoothly changes the direction of the fluid downward. The back surface of a conventional airfoil has a bulge with a large curvature in the front, so the fluid is once directed upward and Since the downward direction is forced to change direction at the part with large curvature, it is difficult to follow the airfoil shape and vortices are likely to occur. This reduces the disadvantages.

以上の説明は揚力や推力を得る場合について行なったが
、揚力や推力を利用せず本体を固定し、回転羽根により
流体を移動させるためのファンの場合も同様の理由によ
り、その効率をよくするものである。また本翼形は、前
後対称で翼厚がほぼ均一であるためその強度を大きくで
きる長所も持つものである。The above explanation was given for obtaining lift and thrust, but for the same reason, it is also important to improve efficiency in the case of a fan that does not use lift or thrust but has a fixed main body and moves fluid using rotating blades. It is something. Additionally, this airfoil has the advantage of being symmetrical from front to back and having a nearly uniform blade thickness, which increases its strength.

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

図面は本翼形 １は本翼形の前面 ２は本翼形の背面 手続補正帯（方式） ％式％ １、事件の表示　昭和５９年特許願第９７０８４号２発
明の名称　流体から揚力を得るための翼および流体から
推力を得るためのプロペラやスクリュウの羽根ならびに
流体を移動させるためのファンの羽根等の流体方向の断
面の形 ３補正をする者 事件との関係　特許出願人 住所 氏名 ５、補正命令の日付　昭和５９年７月３１日６、補正の
対象　明細書の図面の簡単な説明の欄７、補正の内容　
別紙のとおり への追従が悪くなり渦流を生じやすく、そのため速度も
遅れて抵抗となるもので、本翼形の背面（２）はこのよ
うな欠点を少なくするものである。 以上の説明は揚力や推力を得る場合について行なったが
、揚力や推力を利用せず本体を固定し、回、転羽根によ
り流体を移動させるためのファンの場合も同様の理由に
より、その効率をよくするものである。また本翼形は、
前後対称で翼厚がほぼ均一であるためその強度を大きく
できる長所も持つものである。 ４、図面の簡単な説明 図面は本発明の翼形をあられす断面図 １は本翼形の前面 ２は本翼形の背面 特許出願人　小沢潤太部The drawing shows the airfoil 1, the front side 2 of the airfoil, the rear procedural correction band (method) of the airfoil. Relationship with the case of the person who makes the amendment (3) of the shape of the cross section in the fluid direction of the blades of propellers and screw blades for obtaining thrust from the fluid, the blades of fans for moving the fluid, etc. Patent applicant address name 5; Date of amendment order: July 31, 1980 6, Subject of amendment: Brief description of drawings in the specification column 7, Contents of amendment
As shown in the attached paper, the following is difficult and vortices are likely to occur, which slows down the speed and creates resistance.The back surface (2) of this airfoil shape reduces these drawbacks. The above explanation has been given regarding the case of obtaining lift and thrust, but for the same reason, the efficiency of a fan that does not use lift or thrust but whose main body is fixed and moves fluid by rotation and rotating blades is important. It's something you do often. In addition, this airfoil shape is
It also has the advantage of being able to increase its strength because it is symmetrical from front to back and has a nearly uniform blade thickness. 4. Brief description of the drawings The drawings show the airfoil of the present invention. 1 is the front side of the airfoil. 2 is the back side of the airfoil. Patent applicant: Junta Ozawa.

Claims (1)

【特許請求の範囲】 流体から揚力を得るための 翼および流体から推力を得るためのプロペラやスクリュ
ウの羽根ならびに流体を移動させるためのファンの羽根
等の流体方向の断面の形状を、流体に対する前面は曲率
の大きな方を前にし、弦を内側に向けた放物線状とし、
背面は反対に曲率の小さな方を前にし、弦を内側に向け
た放物線状としたもの[Claims] The shape of the cross section in the fluid direction of blades for obtaining lift from a fluid, propeller or screw blades for obtaining thrust from a fluid, fan blades for moving a fluid, etc. is a parabola with the larger curvature facing forward and the string facing inward,
The back has a parabolic shape with the smaller curvature facing forward and the strings facing inward.