EP1306301A1 - Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln - Google Patents
Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln Download PDFInfo
- Publication number
- EP1306301A1 EP1306301A1 EP02090313A EP02090313A EP1306301A1 EP 1306301 A1 EP1306301 A1 EP 1306301A1 EP 02090313 A EP02090313 A EP 02090313A EP 02090313 A EP02090313 A EP 02090313A EP 1306301 A1 EP1306301 A1 EP 1306301A1
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- EP
- European Patent Office
- Prior art keywords
- propeller
- hub
- vortex
- hvv
- propellers
- 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.)
- Granted
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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
-
- 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
- B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation
-
- 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
- B63H2001/283—Propeller hub caps with fins having a pitch different from pitch of propeller blades, or a helix hand opposed to the propellers' helix hand
Definitions
- the invention relates to a device for counteracting flow vortices generated in the hub region of propellers and / or propeller drives in the surrounding fluid. It is a rotationally symmetric transition part (Hub Vortex Vane) between a propeller and the adjacent fluid in the jet direction (incompressible medium) on the same axis of rotation as the propeller.
- the device can be carried out co-rotating with the propeller or fixed. Fields of application are primarily possible in shipbuilding and aircraft construction.
- Propellers of propellers and propellers form at the hub ends as well as at the outer edges of the propeller blades energetic edge vortex.
- the inner edge vortexes of all the propeller blades unite to form a hub vortex in the surrounding fluid in the jet direction behind the propeller, whereby the geometric location of the hub vortex coincides well with the rotational axis of the propeller. It is irrelevant for the formation of the hub vortex whether there is still a flow body behind the actual propeller or not.
- Highly loaded propellers with relatively large hub diameters usually form stronger hub vertebrae than weakly loaded propellers with relatively small hub diameters.
- the fins for the reduction of the hub vortex are already within the Boundary radius later explained after concentration of edge vortices to one uniform hub vortex attached and result in their mostly larger number as the propeller wing number an efficiency-increasing effect, but can not yet completely the parasitic cavitation phenomena with their suppress the adverse effect on the noise emission.
- the invention has for its object to develop a solution for a significant reduction in energy losses through the formation of the hub vortex, for a noise reduction by fluctuating phenomena in the hub vortex in Propellerabstrom and in particular for the noise reduction caused by the hub vortex cavitation phenomena (hub cavitation).
- this object is solved by the features of claim 1.
- Advantageous embodiments of the invention are contained in the accompanying claims 2 and 3.
- the invention is based on a device for counteracting flow vortices generated in the hub region of propellers and / or propeller drives in the surrounding fluid, which has at least one blade, the curvature of the blade being directed counter to the curvature of the propeller.
- the blade extends from a cone-shaped transition part via a cylindrical hub part to the re-cone-shaped divergent closure part, wherein the outer termination of the blade is effected by a cylindrical shell of 10 to 50% of the length of the blade surface.
- a plurality of blades are distributed in meridional arrangement regularly on the circumference of the device.
- the blades start in their radial extent in the axis of rotation of the propeller and do not exceed a limit radius (R G ) within which the tangential component (V T ) of the velocity (V W ) of the turbulent flow is greater than that by the propeller rotation caused peripheral speed (V U ).
- the invention is based on the finding that by appropriate design or shaping of the device, the formation of vortices by the propeller in the hub environment can be counteracted by the pressure conditions in this environment are selectively changed by the design of the device. Since the geometric location of the hub vortex (inner peripheral vortex), in contrast to the tip vortex (outer peripheral vortex) is well known (propeller rotational axis) and independent of the propeller speed and ship speed, secondary measures can only counteract the formation of the hub vortex.
- Hub Vortex Vane contains at least one Scoop 12 in operation for a reduction in hub vortex strength and the associated hub vertebra cavitation provides.
- An HVV is available at any time can be retrofitted, no other components to exchange, but can all other components of the drive system are kept unchanged.
- the HVV Blades 12 are provided which are arranged approximately in meridional alignment are.
- the number of blades is independent of the number of propeller blades and the Outer diameter of the HVV is at about 0.16 of the propeller diameter (with co-rotating HVV) limited.
- the inner boundary of the blades is by a rotary body of the shape according to the reference numerals 9, 10, 11 and the outer boundary is formed by a ring of the shape 13.
- the special ones internal and external limitations serve to suppress a great deal possible secondary cavitation phenomena at the inner and outer ends the scoop (s).
- the HVV according to the invention is both in helical propellers, as Pressure propellers work, as well as with traction propellers applicable.
- FIGS. 2 to 4 show different application possibilities of the HVV.
- FIG. 2 The working as shown in FIG. 2 as a pressure propeller 1 with propeller hub 2 Screw propeller has a co-rotating HVV 6, which in jet direction behind the Propeller 1 is located.
- the behind the propeller 1 along the HVV 6 forming Vertebra consists at first of several vertebrae of the different wings, which themselves then very quickly to form a single vortex, leaving its mark in a narrow area along the axis of rotation of the propeller leaves. This behavior is shown in FIG. 1.
- the direction of rotation of this vortex falls with the direction of rotation of the propeller together and the Tangential velocities of the vortex are greatest in the inside (in the vortex eye potential-theoretically infinitely large) and decrease to the outside.
- V T tangential velocities (V T ) of the fluid to the vortex eye (in the hub vortex identical to propeller rotation axis) towards a purely potential-theoretical law
- V T ⁇ B / 2 ⁇ ⁇ ⁇ r ( ⁇ B hub vortex strength)
- toughness-related influences Oseen vortex
- the inner and outer closure of the Blade surfaces is made by a cone-shaped transition part 9 from the pressure-side propeller hub end 2 via the cylindrical hub part 10 of the HVV to again cone-shaped divergent final part 11 of the hub HVV.
- the outer conclusion of the Vane surfaces of the HVV is effected by a cylindrical shell 13 of FIG up to 50% of the length of the blade surfaces.
- the hydrodynamic benefit of splitting the HVV hub to the three Sections 9 to 11 consist in the concentration of the individual (hub side) Randwirbelanteile the propeller blades to a concentrated hub vortex, the Redirection of the tangential velocity components in the entire area the blades 12 and the "defibering" of a possible residual vortex in the Area of the divergent conical part 11.
- the diameter of the cylindrical spacer 10 should match the diameter of the toughness core (vortex age) coincide.
- the hydrodynamic benefits of the cylindrical surface 13 around the blades consists in preventing possible parasitic cavitation phenomena on outer end of the blades.
- the figures 6 serve to illustrate the derivation of the shape of the blade surfaces and 7. Shown is the "downwind" component 14 of the velocity distribution near the propeller blades 1 which is the main cause of the Tangential speeds are behind the propeller. Due to the generally existing increase in the pitch angle of the Propeller blades to the axis of rotation to and through the vortex - induced increase in Tangential speeds, the curvatures of the blades 12 must be in Change dependence on the radius, so that the flow lines as possible in Beam direction 15 are deflected. In FIGS. 6 and 7 these are Conditions for different radii ratios as Zylinderabwicklitch for the radii ratios 0.10 and 0.15 are shown.
- Fig. 2 to Fig. 4 Applications and embodiments of the HVV are shown in Fig. 2 to Fig. 4 shown.
- For pressure propeller assemblies in conjunction with normal Wave systems or on gear pods or pods or other Motor nacelles is the mitFEende embodiment according to FIG. 2 of Advantage.
- For propeller arrangements on the behind the propeller attachments such as e.g. following a rudder plate is a fixed embodiment as in FIG. 3 outlined, hydrodynamically advantageous.
- Transmission gondolas pods or engine pods is a fixed embodiment at the end of the nacelle according to FIG. 4 advantageous.
- FIG. 2 For a pressure propeller arrangement according to FIG. 2, FIG achievable benefits by means of HVV ("HVV”) based on measurements shown. Compared to a normal frequently used hub completion ("Normal”) by a simple conical hub cap rises Efficiency gain with the Reynolds number clearly. The hub vertebra cavitation could be completely suppressed by application. Become the Suppression of hub vertebra cavitation as usual divergent Used hub runs (“divergent”) increases when using the HVV Efficiency gain still significantly.
- HVV HVV
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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)
- Lubricants (AREA)
- Coating Apparatus (AREA)
- General Details Of Gearings (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Description
Propeller von Schiffs- und Luftschrauben bilden an den nabenseitigen Enden ebenso wie an den äußeren Rändern der Propellerblätter energiereiche Randwirbel aus. Im Unterschied zu den äußeren Randwirbeln der einzelnen Propellerblätter vereinigen sich die inneren Randwirbel aller Propellerblätter zu einem Nabenwirbel im umgebenden Fluid in Strahlrichtung hinter dem Propeller, wobei der geometrische Ort des Nabenwirbels wohldefiniert mit der Drehachse des Propellers zusammenfällt. Dabei ist es für die Ausbildung des Nabenwirbels unerheblich, ob sich hinter dem eigentlichen Propeller noch ein Strömungskörper befindet oder nicht. Hochbelastete Propeller mit verhältnismäßig großen Nabendurchmessern bilden meist stärkere Nabenwirbel aus als schwach belastete Propeller mit verhältnismäßig kleinen Nabendurchmessern. In den Patentschriften US 4 212 586 [2], 1978, EP 255 136 [3], 1987, EP 758 606, 1996 [4] werden verschiedene Varianten zur Reduktion des Nabenwirbelanteils vorgestellt. In der Druckschrift [1] :"An investigation into effective boss cap designs to eliminate propeller hub vortex cavitation" von Atlar, M.; Patience, G. (Osterveld, M.W.C.; Tan, S.G. editors: Practical Design of Ships and Mobile Units,1998 Elsevier Science B.V.)
wird eine ausführliche Übersicht über den Stand der Technik gegeben. In [2] wird eine Variante der Reduktion des Nabenwirbels untersucht, bei die Abgase eines Verbrennungsmotors durch die Nabe geleitet werden, und so versucht wird, das sich durch den Nabenwirbel ausbildende Unterdruckgebiet zu eleminieren. In [3] werden in Interaktion mit jedem einzelnen Propellerblatt auf dem Nabenablauf zusätzliche Flügel angebracht, die einen nabenwirbelreduzierenden Effekt haben sollen.
Für die Geräuschminderung an Marineschiffen, insbesondere bei U-Booten, wurde bisher beim Propellerentwurf versucht durch besondere Steigungs- und Wölbungsverteilungen der Propeller der Bildung dieser Randwirbel entgegenzuwirken. Dies konnte aber nur mit deutlichen Wirkungsgradverlusten erreicht werden.
Bei den Nabenkappenflossen gemäß [3] befinden sich auf der Nabenablaufkappe des Propellers genau so viele Zusatzflügel wie der Propeller Blätter hat und stehen in direkter Wechselwirkung mit diesen. Sie sind (im Wesentlichen) außerhalb des später betrachteten Grenzradiusses angebracht (vgl. Fig. 1 bis Fig. 3 in [3]) und können ihre optimale Wirkung nur für einen relativ kleinen Fortschrittsgradbereich (Belastungsbereich) entfalten, da sich in Abhängigkeit vom Fortschrittsgrad die Positionen der inneren Randwirbel der einzelnen Propeller verändern. Trotz ihres wirbelreduzierenden Effektes können insbesondere bei höheren Belastungen noch parasitäre Kavitationserscheinungen mit ihrem nachteiligen Effekt auf die Geräuschabstrahlung auftreten.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausbildungen der Erfindung sind in den zugehörigen Ansprüchen 2 und 3 enthalten.
Die Erfindung geht aus von einer Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln, die mindestens eine Schaufel aufweist, wobei die Wölbung der Schaufel der Wölbung des Propellers entgegengerichtet ist.
Die Schaufel verläuft erfindungsgemäßvon einem konusförmigen Übergangsteil über ein zylindrisches Nabenteil zum wieder konusförmigen divergierendem Abschlußteil, wobei der äußere Abschluss der Schaufel durch einen zylinderförmigen Mantel von 10 bis 50 % der Länge der Schaufelfläche erfolgt. Nach einem bevorzugten Merkmal sind mehrere Schaufeln in meridionaler Anordnung regelmäßig auf den Umfang der Vorrichtung verteilt.
Nach einem besonders bevorzugten Merkmal beginnen die Schaufeln in ihrer radialen Erstreckung in der Rotationsachse des Propellers und überschreiten einen Grenzradius (RG) nicht, innerhalb welchem die Tangentialkomponente (VT) der Geschwindigkeit (VW) der Wirbelströmung größer ist als die durch die Propellerdrehung verursachte Umfangsgeschwindigkeit (VU).
Da der geometrische Ort des Nabenwirbels (innerer Randwirbel) im Gegensatz zum Spitzenwirbel (äußerer Randwirbel) wohlbekannt (Drehachse des Propellers) und unabhängig von der Propellerdrehzahl und Schiffsgeschwindigkeit ist, kann durch sekundäre Maßnahmen nur der Ausbildung des Nabenwirbels entgegengewirkt werden.
Die Vorteile der Erfindung beruhen auf der erfindungsgemäß erstmals realisierten Kombination von einer deutlichen wirkungsgradsteigernden Wirkung und einer weitestgehenden Vermeidung jeglicher Kavitationserscheinungen (mit ihrem nachteiligen Effekt auf die Geräuschabstrahlung). In Versuchsreihen zeigten sich im Vergleich zu anderen Typen von Nabenkappenflossen für die erfindungsgemäße Vorrichtung der höchste Wirkungsgradgewinn. Ein zusätzlicher Gewinn ergibt sich auf Seiten des Propellerentwurfes für kavitationsfreie Auslegungen, dass man keine wirkungsgradsenkende Maßnahmen zur Vermeidung von Nabenwirbelkavitation mehr ergreifen muß. D.h. bereits der entworfene Propeller hat selbst einen höheren Wirkungsgrad der noch durch die Energierückgewinnung durch die HVV aus den Nabenwirbelverlusten vergrößert wird.
- Fig.1:
- Wirbelbildung hinter einem Propeller entlang der eines Hub Vortex Vane (nachfolgend HVV genannt),
- Fig. 2:
- eine Applikation 6 einer HVV als Ersatz für einen normalen Nabenablauf bei dem die HVV mit dem Propeller mitrotiert,
- Fig. 3:
- eine HVV 6 ist am Ruderblatt 7 eines Schiffes fixiert,
- Fig. 4:
- die HVV ist am Ende einer Motorgondel/Pod/Getriebegehäuse 8 fest montiert,
- Fig. 5:
- schematische Darstellung einer möglichen Ausführung eines Hub Vortex Vane,
- Fig.6:
- schematische Darstellung der "Abwind"komponente der Geschwindigkeitsverteilung in der Nähe der Propellerblätter für die Radienverhältnisse 0.1 als Zylinderabwicklungen,
- Fig.7:
- schematische Darstellung der "Abwind"komponente der Geschwindigkeitsverteilung in der Nähe der Propellerblätter für die Radienverhältnisse 0.15 als Zylinderabwicklungen,
- Fig.8:
- Darstellung der Abhängigkeit des Gütegrades der Propulsion von der Reynoldszahl.
Die Fig. 2 bis Fig. 4 zeigen unterschiedliche Applikationsmöglichkeiten der HVV auf.
Die Schaufeln 12 der HVV erstrecken sich aus diesem Grund von der Propellerachse bis maximal dem Grenzradius RG, um die Wirkung der Schaufeln optimal zu nutzen. Die Wölbung der Schaufelflächen ist der der Propellerflächen entgegengesetzt. Auf die Weise werden die Wirbelströme in Strahlrichtung umgelenkt, wobei ein zusätzlicher Schub erzeugt wird. In dem dargestellten Ausführungsbeispiel sind acht, auf den Umfang der HVV verteilte Schaufeln (Fig. 5) gezeigt, die sich von dem der Propellernabe Pos. 2 in Fig. 1 zugekehrten Ende 9 bis zum Ende der HVV bei 11 aus Fig. 5 erstrecken.
- 1.
- Propeller, Schiffschraube, Luftschraube
- 2.
- Propellernabe
- 3.
- Antriebswelle des Propellers
- 4.
- Ablaufhaube
- 5.
- Nabenwirbel
- 6.
- Hub-Vortex-Vane (HVV)
- 7.
- Ruderblatt
- 8.
- Getriebegehäuse eines rundumsteuerbaren Antriebes, Motorgondel, Pod mit Motor
- 9.
- Übergangsteil Propeller-HVV
- 10.
- Zylindrisches Nabenzwischenstück der HVV
- 11.
- Konisches Abschlußteil der Nabe der HVV
- 12.
- Schaufeln, Flossen der HVV
- 13.
- Zylindermantel der HVV
- 14.
- "Abwind" des Propellers an einem Flügel
- 15.
- Axiale Strahlrichtung
Claims (3)
- Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln, die mindestens eine Schaufel aufweist, wobei die Wölbung der Schaufel der Wölbung des Propellers entgegengerichtet ist, dadurch gekennzeichnet, dass die Schaufel (12) von einem konusförmigen Übergangsteil (9) über ein zylindrisches Nabenteil (10) zum wieder konusförmigen divergierendem Abschlußteil (11) verläuft, wobei der äußere Abschluss der Schaufel (12) durch einen zylinderförmigen Mantel (13) von 10 bis 50 % der Länge der Schaufelfläche erfolgt.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass mehrere Schaufeln (12) in meridionaler Anordnung regelmäßig auf den Umfang der Vorrichtung verteilt sind.
- Vorrichtung nach einem der o.g. Ansprüche, dadurch gekennzeichnet, dass die Schaufeln in ihrer radialen Erstreckung in der Rotationsachse des Propellers beginnen und einen Grenzradius (RG) nicht überschreiten, innerhalb welchem die Tangentialkomponente (VT) der Geschwindigkeit (VW) der Wirbelströmung größer als die durch die Propellerdrehung verursachte Umfangsgeschwindigkeit (VU) ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10152977 | 2001-10-26 | ||
DE10152977A DE10152977C1 (de) | 2001-10-26 | 2001-10-26 | Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1306301A1 true EP1306301A1 (de) | 2003-05-02 |
EP1306301B1 EP1306301B1 (de) | 2006-12-20 |
Family
ID=7703859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02090313A Expired - Lifetime EP1306301B1 (de) | 2001-10-26 | 2002-09-04 | Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1306301B1 (de) |
AT (1) | ATE348752T1 (de) |
DE (2) | DE10152977C1 (de) |
DK (1) | DK1306301T3 (de) |
ES (1) | ES2276888T3 (de) |
NO (1) | NO336514B1 (de) |
PT (1) | PT1306301E (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011055515A1 (de) | 2011-11-18 | 2013-05-23 | Becker Marine Systems Gmbh & Co. Kg | Propelleranordnung, insbesondere für Wasserfahrzeuge |
CN103803040A (zh) * | 2014-01-24 | 2014-05-21 | 中国船舶重工集团公司第七○二研究所 | 螺旋桨桨毂消涡轮 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4212586A (en) | 1978-12-19 | 1980-07-15 | Aguiar Mervyn F | Turboexhaust hub extension for a marine propeller |
DE3037369A1 (de) * | 1980-09-01 | 1982-03-11 | Escher Wyss Gmbh, 7980 Ravensburg | Schiffspropeller |
EP0255136A1 (de) | 1986-07-31 | 1988-02-03 | Mitsui O.S.K. Lines, Ltd. | Schiffsschraubennabe mit Flossen |
EP0758606A1 (de) | 1995-08-16 | 1997-02-19 | Schottel-Werft Josef Becker GmbH & Co KG. | Nabenkappe für Schiffsschrauben |
US6244912B1 (en) * | 2000-03-20 | 2001-06-12 | Electric Boat Corporation | Strut-mounted marine propulsion unit |
-
2001
- 2001-10-26 DE DE10152977A patent/DE10152977C1/de not_active Expired - Lifetime
-
2002
- 2002-09-04 PT PT02090313T patent/PT1306301E/pt unknown
- 2002-09-04 DK DK02090313T patent/DK1306301T3/da active
- 2002-09-04 ES ES02090313T patent/ES2276888T3/es not_active Expired - Lifetime
- 2002-09-04 AT AT02090313T patent/ATE348752T1/de not_active IP Right Cessation
- 2002-09-04 DE DE50208997T patent/DE50208997D1/de not_active Expired - Lifetime
- 2002-09-04 EP EP02090313A patent/EP1306301B1/de not_active Expired - Lifetime
- 2002-10-25 NO NO20025144A patent/NO336514B1/no not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4212586A (en) | 1978-12-19 | 1980-07-15 | Aguiar Mervyn F | Turboexhaust hub extension for a marine propeller |
DE3037369A1 (de) * | 1980-09-01 | 1982-03-11 | Escher Wyss Gmbh, 7980 Ravensburg | Schiffspropeller |
EP0255136A1 (de) | 1986-07-31 | 1988-02-03 | Mitsui O.S.K. Lines, Ltd. | Schiffsschraubennabe mit Flossen |
EP0758606A1 (de) | 1995-08-16 | 1997-02-19 | Schottel-Werft Josef Becker GmbH & Co KG. | Nabenkappe für Schiffsschrauben |
US6244912B1 (en) * | 2000-03-20 | 2001-06-12 | Electric Boat Corporation | Strut-mounted marine propulsion unit |
Non-Patent Citations (2)
Title |
---|
ATLAR M AND PATIENCE G.: "An investigation into effective boss cap designs to eliminate propeller hub vortex cavitation", PRACTICAL DESIGN OF SHIPS AND MOBILE UNITS, PROCEEDINGS,THE HAGUE ,SEPTEMBER 1998, ELSEVIER,OOSTERVELD & TAN, ED, ISBN: 0 444 82918 0, September 1998 (1998-09-01), amsterdam NL, pages 757 - 769, XP002229334 * |
ATLAR M, PATIENCE G. TS: "Practical Design of Ships and Mobile Units", 1998, S.G. EDITORS, article OSTERVELD, M.V.C. TAN: "An Investigation into efective b" |
Also Published As
Publication number | Publication date |
---|---|
NO20025144D0 (no) | 2002-10-25 |
DE50208997D1 (de) | 2007-02-01 |
NO20025144L (no) | 2003-04-28 |
ATE348752T1 (de) | 2007-01-15 |
PT1306301E (pt) | 2007-02-28 |
DE10152977C1 (de) | 2003-05-08 |
ES2276888T3 (es) | 2007-07-01 |
NO336514B1 (no) | 2015-09-14 |
DK1306301T3 (da) | 2007-04-10 |
EP1306301B1 (de) | 2006-12-20 |
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