FR2507562A1 - Marine vessel drive propeller - has channels through blades to reduce friction of trailing edge - Google Patents
Marine vessel drive propeller - has channels through blades to reduce friction of trailing edge Download PDFInfo
- Publication number
- FR2507562A1 FR2507562A1 FR8111890A FR8111890A FR2507562A1 FR 2507562 A1 FR2507562 A1 FR 2507562A1 FR 8111890 A FR8111890 A FR 8111890A FR 8111890 A FR8111890 A FR 8111890A FR 2507562 A1 FR2507562 A1 FR 2507562A1
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- FR
- France
- Prior art keywords
- channels
- blades
- propeller
- axis
- relative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/28—Other means for improving propeller efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Description
Hélice marine
La presente invention concerne une hélice marine pour la propulsion des bâteaux.Marine propeller
The present invention relates to a marine propeller for propelling ships.
On sait que les pales des hélices marines ont une face anterieure négative convexe ou extrados qui pénètre dans la masse liquide se trouvant devant lthelice, et une face posterieure positive concave ou intrados qui s 3appuie et pousse sur l'eau se trouvant derrière ladite hélice. Lors de la rotation de cette dernière, la face négative des pales exerce une forte friction sur la masse liquide, ce qui cree une résistance à l'avancement contrariant l'efficacité de la poussee donnée par la face positive desdites pales. Ce phénomène est une cause de limitation du rendement propulsif des hélices connues.It is known that the blades of marine propellers have a convex negative upper surface or upper surface which penetrates into the liquid mass lying in front of the propeller, and a positive concave posterior surface or lower surface which leans and pushes on the water lying behind said propeller. During the rotation of the latter, the negative face of the blades exerts a strong friction on the liquid mass, which creates a resistance to advancement counteracting the effectiveness of the thrust given by the positive face of said blades. This phenomenon is a cause of limitation of the propulsive efficiency of known propellers.
Un objectif de la présente invention est, sinon de supprimer, du moins de diminuer très sensiblement les effets perturbateurs de ce phénomène.An objective of the present invention is, if not to eliminate, at least to very significantly reduce the disturbing effects of this phenomenon.
Selon l'invention, ce but est atteint au moyen d'une hélice dont les pales sont traversees par des canaux inclines, d'une part, vers l'avant par rapport a l'axe de rotation de cette dernière et, d'autre part, dans le sens de rotation de ladite hélice.According to the invention, this object is achieved by means of a propeller whose blades are crossed by inclined channels, on the one hand, forwardly relative to the axis of rotation of the latter and, on the other hand part, in the direction of rotation of said propeller.
Cet agencement permet une amelioration très sensible du rendement propulsif des helices, d'oO une vitesse accrue, une fatigue des moteurs moindre et une économie de carburant.This arrangement allows a very significant improvement in the propulsive efficiency of the propellers, resulting in increased speed, reduced engine fatigue and fuel economy.
Grace à cette helice, en effet, la pénétration des pales dans la masse liquide est facilitée en raison du fait que l'eau se trouvant contre la face negative desdites pales traverse les canaux et diminue le frottement sur ces dernieres. Thanks to this propeller, in fact, the penetration of the blades into the liquid mass is facilitated due to the fact that the water lying against the negative face of said blades crosses the channels and reduces friction on the latter.
D'autre part, l'eau pousse en turbulence par la face positive des pales, engendre une depression qui favorise le passage de l'eau dans les canaux en creant une aspiration.On the other hand, the water pushes in turbulence by the positive face of the blades, generates a depression which favors the passage of the water in the channels by creating a suction.
Enfin, l'invention permet un allègement des helices pour une surface portante égale, d'o une diminution de leur inertie rotative. Finally, the invention makes it possible to lighten the propellers for an equal bearing surface, hence a reduction in their rotary inertia.
Ces buts, avantages et caractéristiques, et d'autres encore, ressortiront mieux de la description qui suit et des dessins annexés dans lesquels
La figure 1 est une vue arrière d'une hélice marine selon l'invention considérée suivant sa face posterieure positive.These aims, advantages and characteristics, and others still, will emerge more clearly from the description which follows and from the appended drawings in which
Figure 1 is a rear view of a marine propeller according to the invention considered along its positive rear face.
La figure 2 est, à plus grande échelle, une vue partielle de la figure 1.FIG. 2 is, on a larger scale, a partial view of FIG. 1.
La figure 3 est une vue en coupe suivant la ligne 3 - 3 de la figure 2.Figure 3 is a sectional view along line 3 - 3 of Figure 2.
On se reporte auxdits dessins pour décrire un mode d'exécution intéressant, quoique nullement limitatif, de l'hélice marine selon l'invention.Reference is made to said drawings to describe an interesting, although in no way limiting, embodiment of the marine propeller according to the invention.
Cette hélice est remarquable par le fait que ses pales 1 sont traversées par une pluralité de canaux 2. Les entrées et/ou les sorties de ces canaux peuvent être alignées radialement et disposées sur des arcs concentriques, en quinconce ou autrement.This propeller is remarkable in that its blades 1 are crossed by a plurality of channels 2. The inputs and / or outputs of these channels can be aligned radially and arranged on concentric arcs, staggered or otherwise.
Les entrées 2a des canaux 2 se trouvent sur la face négative la des pales, tandis que les sorties 2b desdits canaux sont disposees sur la face positive lb desdites pales.The inputs 2a of the channels 2 are located on the negative side of the blades, while the outputs 2b of the said channels are arranged on the positive side 1b of the said blades.
Les canaux 2 sont inclines vers l'avant par rapport à l'axe du moyeu 3 ou axe de rotation A de lthélice, comme le montre notamment la figure 3.The channels 2 are inclined forward relative to the axis of the hub 3 or axis of rotation A of the propeller, as shown in particular in FIG. 3.
Autrement dit, les canaux 2 ont une disposition divergente d'avant en arrière par rapport audit axe de rotation.In other words, the channels 2 have a divergent arrangement from front to back with respect to said axis of rotation.
D'autre part, les canaux 2 sont également inclinés par rapport au sens de rotation de l'hélice, cette disposition étant plus spécialement visible sur la figure 2. Chaque canal 2 a donc une orientation oblique par rapport à un plan P - P dans lequel est compris l'axe A.du moyeu 3 de l'hélice. Les canaux 2 ont une orientation divergente, d'avant en arrière, par rapport au bord d'attaque lc des pales.On the other hand, the channels 2 are also inclined relative to the direction of rotation of the propeller, this arrangement being more especially visible in FIG. 2. Each channel 2 therefore has an oblique orientation with respect to a plane P - P in which includes the axis A. of the hub 3 of the propeller. The channels 2 have a divergent orientation, from front to back, relative to the leading edge lc of the blades.
Par ailleurs, on conçoit que le degré d'obliquité des canaux 2 par rapport au plan P - P differe en fonction de leur position sur la pale et de la courbure de cette dernière. Furthermore, it is understood that the degree of obliquity of the channels 2 relative to the plane P - P differs according to their position on the blade and the curvature of the latter.
Le nombre et le diamètre des canaux 2 est fonction du diamètre de I'hélice, mais il peut varier pour des hélices de caractéristiques identiques. A titre d'exemple, les pales d'une hélice d'un diametre de 35 cm peuvent être traversees par des canaux d'un diamètre de 5 à 6 mm.The number and the diameter of the channels 2 depends on the diameter of the propeller, but it can vary for propellers of identical characteristics. For example, the blades of a propeller with a diameter of 35 cm can be crossed by channels with a diameter of 5 to 6 mm.
D'autre part, lorsqu'il s'agit d'helice de grandes dimensions, les canaux 2 peuvent avantageusement avoir des diamètres croissant en s'eloignant de l'axe desdites helices. On the other hand, when it is a large propeller, the channels 2 can advantageously have increasing diameters away from the axis of said propellers.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8111890A FR2507562A1 (en) | 1981-06-15 | 1981-06-15 | Marine vessel drive propeller - has channels through blades to reduce friction of trailing edge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8111890A FR2507562A1 (en) | 1981-06-15 | 1981-06-15 | Marine vessel drive propeller - has channels through blades to reduce friction of trailing edge |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2507562A1 true FR2507562A1 (en) | 1982-12-17 |
Family
ID=9259605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8111890A Pending FR2507562A1 (en) | 1981-06-15 | 1981-06-15 | Marine vessel drive propeller - has channels through blades to reduce friction of trailing edge |
Country Status (1)
Country | Link |
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FR (1) | FR2507562A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4714408A (en) * | 1985-06-06 | 1987-12-22 | Nissan Motor Co., Ltd. | Radiator fan |
EP0975516A1 (en) * | 1997-04-14 | 2000-02-02 | Chi Keung Leung | Improved fluid displacing blade |
WO2003013954A1 (en) * | 2001-08-08 | 2003-02-20 | Robin David Shaw | Cavitation alleviation and line cutting device |
US8062083B2 (en) | 2006-09-11 | 2011-11-22 | Ambassador Marine Limited | Line cutter |
WO2018206978A1 (en) * | 2017-05-11 | 2018-11-15 | Oscar Propulsion Ltd | Propeller cavitation and noise reduction |
US12017742B2 (en) * | 2017-05-11 | 2024-06-25 | Oscar Propulsion Ltd. | Cavitation and noise reduction in axial flow rotors |
-
1981
- 1981-06-15 FR FR8111890A patent/FR2507562A1/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4714408A (en) * | 1985-06-06 | 1987-12-22 | Nissan Motor Co., Ltd. | Radiator fan |
EP0975516A1 (en) * | 1997-04-14 | 2000-02-02 | Chi Keung Leung | Improved fluid displacing blade |
EP0975516A4 (en) * | 1997-04-14 | 2002-06-12 | Chi Keung Leung | Improved fluid displacing blade |
WO2003013954A1 (en) * | 2001-08-08 | 2003-02-20 | Robin David Shaw | Cavitation alleviation and line cutting device |
AU2002355362B2 (en) * | 2001-08-08 | 2005-02-03 | Robin David Shaw | Cavitation alleviation and line cutting device |
US7134837B2 (en) | 2001-08-08 | 2006-11-14 | Robin David Shaw | Cavitation alleviation and line cutting device |
US8062083B2 (en) | 2006-09-11 | 2011-11-22 | Ambassador Marine Limited | Line cutter |
WO2018206978A1 (en) * | 2017-05-11 | 2018-11-15 | Oscar Propulsion Ltd | Propeller cavitation and noise reduction |
CN110869275A (en) * | 2017-05-11 | 2020-03-06 | 奥斯卡推进有限责任公司 | Propeller cavitation and noise reduction |
US12017742B2 (en) * | 2017-05-11 | 2024-06-25 | Oscar Propulsion Ltd. | Cavitation and noise reduction in axial flow rotors |
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