FR2838709A1

FR2838709A1 - Double blade propeller has each blade composed of two blades rotating together at same speed around same axis in two parallel separate rotational planes

Info

Publication number: FR2838709A1
Application number: FR0205083A
Authority: FR
Inventors: Yves Francois Cadiou
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-23
Filing date: 2002-04-23
Publication date: 2003-10-24

Abstract

The propeller has its blades doubled, each blade being composed of two blades which rotate together around the same axis at the same speed over two parallel separate rotational planes.

Description

sur une partie de la longueur.on a part of the length.

_ Descr.phon I- Ce outest lthe ice a nales iumelees L'helice a pales jumelees ameliore la technique actuelle des helices. Comme les helices actuelles, elle travaille dans un fluide, elle deplace ou leve ltengin mobile porteur de l'helice (avion, helicoptere, hydroglisseur, bateau, etc.3, ou- elle deplace le fluide dans un engin fixe (tuyere, turbine, sechoir, ventilateur, hydrojet, etc). n est entendu que, crmune les helices actuelles, lthelice a pales _ Descr.phon I- This outest lthe ice a nales iumelees The helix has twin blades improves the current technique of the propellers. Like the current propellers, it works in a fluid, it moves or raises the mobile ltengin carrying the helix (plane, helicopter, hydrofoil, boat, etc.3, or- it displaces the fluid in a fixed gear (nozzle, turbine, dryer, fan, hydrojet, etc.) It is understood that, crmune the current propellers, lthelice has blades

jumelees est equilibree autour de son axe de rotation: la description suivante, is balanced around its axis of rotation: the following description,

qui stinteresse a une senle pale jumelee, considere acquis cet equilibrage autour de l'axe de rotation. De plus, cornme les helices actuelles, l'helice a pales Ji jumelees peut 8tre bipale, tripale, quadripale, etc. : ::: II- Comment travaille lthelice a pales iumelees En ltetat actuel dela technique, une helice est constituee de which is of interest to a pair of twinned blades, is considered to have acquired this equilibrium around the axis of rotation. In addition, like the current propellers, the twin-blade propeller can be two-bladed, three-bladed, quadripal, and so on. : ::: II- How to work with a blade of blades In the current state of the art, a propeller is made up of

pales qui tournent autour d'un axe dans un seul plan perpendiculaire a cet axe. blades that rotate about an axis in a single plane perpendicular to that axis.

:: L'helice a pales jumelees consiste a jumeler les pales. Chaque pale est desormais double, comme indique sur les fgures I et 2: chaque double- pale de l'helice a pales jumelees est constituee de d'eux pales (la pale G et la pale T sur lesig2lres 1: et 2) qui tournent solidairement autour du meme axe, a la meme vitesse et dans le meme sees, sur deux plans paralleles mais distincts (le plan G et le plan T sur lesfgures I et 2). Note pour les pratiquants de la navigation a voile: les pales et leur plan de rotation ont ete nominees :: The twin blade propeller consists of pairing the blades. Each blade is henceforth double, as indicated on FIGS. 1 and 2: each double blade of the twin-blade helix is made up of blades (the blade G and the blade T on the pins 1: and 2) which rotate. solidarily about the same axis, at the same speed and in the same sees, on two parallel but distinct planes (the plane G and the plane T on the figures I and 2). Note for sailing operators: the blades and their rotation plan have been nominated

ainsi par analogie au genois (G) et a la trirquette (T). thus by analogy to the genois (G) and the trirquette (T).

Le jumelage des pales produit plusieurs effets qui ameliorent les The pairing of the blades produces several effects which improve the

performances de lthelice par comparaison a l'etat anterieur de la technique. performance of the method in comparison with the prior art.

1- Le bord d'attaque de la pale T devie une partie du fluide vers 1- The leading edge of the blade T becomes part of the fluid towards

lintrados de la pale G. dont la pression se trouve ainsi augmentee. lintrados of the blade G. whose pressure is thus increased.

:. |;, 2- La depression sur l'extrados de la pale T est canalisee par la pale G. retardant ainsi le decrochage de T. 3- Si ['angle dtincidence de la pale G est legerement superieur a celui de la pale T. il se produit entre les pales G et T un effet Venturi qui accelere le fluide. De ce fait: - la depression sur l'extrados de la pale G est renforcee (aspiration au bord de fuite de G), - le decrochage de G est retarde (idem: ['aspiration favorise l'ecoulement laminaire).; :: - 20: Selon l'effet que l'on cherchera a privilegier (puissance, vitesse, souplesse de maraeuvre, nature du fluide, tuybre, signature sonore, etc.), les dimensions des pales, leurs profile, leurs angles d? incidence, leur ecaTtement, pourront differer. I1 ntest pas necessaire que les pales G et T soient identiques, mais elles doivent etre jumelees, tourner ensemble, a la meme vitesse et dans le meme sees, sur deux plans paralleles mais distincts autour d'un meme axe de rotation. Wiles agissent ainsi l'une sur l'autre par l'intermediaire du fluide ou :. 2- The depression on the upper surface of the blade T is channeled by the blade G. thus delaying the stalling of T. 3- If the angle of incidence of the blade G is slightly greater than that of the blade T. a Venturi effect is produced between the blades G and T which accelerates the fluid. Because of this: - the depression on the upper surface of the blade G is reinforced (suction at the trailing edge of G), - the stalling of G is delayed (idem: ['suction favors the laminar flow]; :: - 20: According to the effect that one will seek to privilege (power, speed, flexibility of maraeuvre, nature of the fluid, tuybre, sound signature, etc.), the dimensions of the blades, their profiles, their angles d? their impact may differ. It is not necessary that the blades G and T are identical, but they must be twinned, rotate together, at the same speed and in the same sees, on two parallel but distinct planes around the same axis of rotation. Wiles thus act on each other through the fluid or

elles travaillent.they work.

Les variantes ou ameliorations suivantes peuvent etre apportees. The following variants or improvements can be made.

O 1- Ajout du systeme de pas variable. O 1- Added variable pitch system.

2- Ajout d'un dispositif d'ecartement variable: l'une des deux pales peut coulisser a volonte le long de l'axe de rotation, stecartant ou se 2- Addition of a variable spacing device: one of the two blades can slide at will along the axis of rotation, stecartant or

rapprochant ainsi de sa jumelle.bringing her closer to her twin.

3- Le jumelage ne concerne pas necessairement toute la l longueur de la pale: la pale peut etre conforme a la technique anterieure sur une partie de sa longueur, mais devenir une pale jumelee sur une autre partie de 3- The pairing does not necessarily affect the entire length of the blade: the blade can be in accordance with the prior art for part of its length, but become a twin blade on another part of

sa longueur.its length.

4 - Au lieu dun jumelage au sens strict, I'on peut realiser un triplage (voire plus) de la pale, c'est-a-dire trots ou plusieurs plans 2gparalleles mais distincts de rotation solidaire. Le principe reste le m8me (comparer au voilier: genois, trinquette, clinfoc, voile, etais, artimon, etc.).; III- Utilite de l'helice a nales iumeldes 4 - Instead of a twinning in the strict sense, one can achieve a tripling (or more) of the blade, that is to say, trots or several plans 2gparalleles but distinct rotation integral. The principle remains the same (compare to the sailboat: genoa, staysail, clinfoc, sail, sails, mizzen, etc.) .; III- Utility of the helix

L'helice a pales jumelees produit les effets suivants. The helix has twin blades produces the following effects.

1- Diminution de la vitesse de rotation et de ce fait: 11- diminution du bruit; 12- en bout de pale, la vitesse du son est moins vite atteinte et l'on peut 1- Decrease of the speed of rotation and thus: 11- decrease of the noise; 12- at the end of the blade, the speed of sound is less quickly reached and one can

alors augmenter la vitesse limite de l'aeronef, notamment helicoptere. then increase the speed limit of the aircraft, including helicopter.

2- Plus de souplesse de manccuvre: ó' 21- meilleure reponse aux variations de regime; 2- More flexibility of maneuver: - better response to variations in diet;

22- augmentation de la limite ou apparalt le decrochage ou la cavitation. 22- Increasing the limit or appearing the stall or cavitation.

3 3- Si l t on y aj oute un dispositif d' ecartement variable, la signature sonore (notamment pour bateau, identifiable par sonar) est modifee a volonte en 3- If a variable spacing device is added, the sound signature (in particular for boat, identifiable by sonar) is modified voluntarily.

cours de fonctionnement.running course.

Si l'on y ajoute le pas variable: 41- effet <<reverse>> plus effeace, moins de temps de reponse qu'avec une 3 5 helice a pas variable dans l'etat actuel de la tecque; 42- la << mise en drapeau >> presente moins de resistance a 1'avancement qu'avec une helice a pas variable dans l'etat actuel de la technique; If we add the variable pitch: 41- "reverse" effect more effeace, less response time with a helix has not variable in the current state of the tecque; 42- "feathering" has less resistance to progress than with a variable pitch propeller in the current state of the art;

43- la signature sonore est modifiee a volonte en cours de fonctionnement. 43- the sound signature is modified at will during operation.

))

2838709;2838709;

_ J_ J

Claims

claims

1- Helix characterized in that its blades wind jumeKes, that is to say that each blade is made of two blades that turn solidarily, around the same axis, at the same speed on two levels of

Parallel but distinct rotation.

{5-Helice according to claim 1 caraeterisee in that

the blades wind has variable pitch.

3- Helice according to claim 1, characterized in that

the blades have variable pitch.

4 Helix according to claim 1, characterized in that

the blade is twinned over part of the length.

:: 5 Helice according to claim 1, characterized in that