WO2008095259A9 - Marine propeller pitch adjustment means - Google Patents
Marine propeller pitch adjustment means Download PDFInfo
- Publication number
- WO2008095259A9 WO2008095259A9 PCT/AU2008/000162 AU2008000162W WO2008095259A9 WO 2008095259 A9 WO2008095259 A9 WO 2008095259A9 AU 2008000162 W AU2008000162 W AU 2008000162W WO 2008095259 A9 WO2008095259 A9 WO 2008095259A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- marine propeller
- channel
- adjustment means
- propeller
- Prior art date
Links
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
- B63H1/26—Blades
-
- 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
Definitions
- the present invention relates to a means for adjusting the hydrodynamic properties, such as the pitch, of a marine propeller.
- Propulsion systems for marine vessels are typically calibrated to operate within narrow parameters in order to achieve efficient operation.
- the hydrodynamic properties of a marine propeller are generally closely matched to the speed and power of an associated motor; the weight, weight distribution and hull resistance of the vessel; and the environment, such as the water temperature, within which the vessel operates.
- the present invention seeks to at least partially ameliorate these problems, and to provide a means for altering the hydrodynamic properties of a marine propeller in a controlled manner.
- a blade for a marine propeller including an attachment portion arranged to receive an adjustment means, whereby engagement of an adjustment means with the attachment portion alters the hydrodynamic properties of the blade.
- the present invention envisages a selection of adjustment means being available, whereby a particular one of more of the adjustment means may be chosen achieved desired hydrodynamic properties.
- an adjustment means arranged to engage with a blade of a marine propeller, the adjustment means having an engaging portion arranged to be received by an attachment portion of a blade, whereby engagement of the adjustment means with a blade alters the hydrodynamic properties of the blade.
- the attachment portion comprises a channel within the blade
- the adjustment means comprises a strip receivable within the channel, the strip including a portion which juts outwardly.
- the strip may be readily removed and interchanged.
- the channel is located adjacent to a trailing edge of the blade, on a high pressure face.
- this allows for the use of strips to alter the effective pitch of the propeller. It is desirable that the strip be located as close as possible to the trailing edge without introducing stress concentrations within the blade. This is preferably within 50mm of the trailing edge, and may be about 15mm from the trailing edge. The width of the strip may be less than 10mm, perhaps about 5mm. This provides sufficient strip strength without greatly altering blade properties.
- the length of the strip may be about 60% of the blade radius. Having the strip extend beyond 90% of the blade radius, and providing a concave curve at its end, allows for a useful localised increase in water pressure at this end. Have the strip commence from about 30% of the blade radius minimises losses due to water flow internally of the strip.
- the strip may be located on the low pressure face of the blade. It is envisaged that this will help in prevention of cavitation.
- Figure 1 is a perspective of a marine propeller blade in accordance with the present invention
- Figure 2 is a side view of the propeller blade of Figure 1 ;
- Figure 3 is a front view of the propeller blade of Figure 1 ;
- Figure 4 is an end view of the propeller blade of Figure ;
- Figure 5 is a cross section, through the chord A-A marked in Figure 4, of the propeller blade of Figure 1 ;
- Figure 6 is an enlarged view of a portion of the cross section shown in Figure 5.
- a single blade 12 of a propeller 10 has a plurality of such blades 2 extending outwardly from a hub 4.
- a propeller 10 may have five or six blades 12, however it will be appreciated that the present invention may be applied to propellers having any desired number of blades.
- the propeller 10 has a low-pressure or upstream side 16 and a high pressure or downstream side 8.
- the blades 12 are all substantially similar in shape and configuration. Each blade
- each blade 12 has a high pressure face 20 substantially oriented towards the downstream side 8 of the propeller 10, and a low pressure face 22 substantially oriented towards the upstream side 16 of the propeller 10.
- Each blade 12 has a leading edge 24, a trailing edge 26, and an inner edge 30.
- the inner edge 30 of each blade 12 is joined to the hub 14.
- the leading edge 24 forms a convex curve extending from the inner edge 30 to an outermost part of the propeller 10.
- the trailing edge 26 forms a generally concave curve from the inner edge 30 to the outermost part of the propeller.
- the curvature of the leading edge 24 is significantly greater than that of the trailing edge 26, thus defining a bulbous shape for the faces 20, 22 of the blade.
- each blade 12 curves away from the hub 14, as best seen in Figure 2.
- the inner edge 30 is oriented relatively along the hub 14, making a blade angle relative to a longitudinal direction of the hub 14.
- the blade angle will vary with distance from the boss and nominal design pitch.
- the leading edge 24 makes an angle of about 65° relative to a longitudinal direction of the hub 14.
- the advantage of the present invention lies in the ability to modify the properties of the propeller without changing the engineered shape and configuration.
- Each blade 12 includes an attachment portion in the form of a channel 32.
- the channel 32 is located on the high pressure face 20 of the blade adjacent to, but slightly spaced from, the trailing edge 26.
- the channel extends from a first end 34, near the inner edge 30, to a second end 36, near the outermost end ⁇ of the trailing edge 26.
- the channel 32 substantially follows the contour of the trailing edge 26.
- the channel 32 has a concave curve at its outer end 36, following the contour of the trailing edge 26 as it meets the leading edge 24.
- the first end 34 is located at a point with a radial distance about 0.3 of the propeller radius.
- the second end 36 is located at a point with a radial distance about 0.925 of the propeller radius.
- the low pressure face 22 tapers towards the high pressure face 20 of the blade 12 at the trailing edge 26.
- the channel 32 is located just inside this taper, within the full blade thickness. In the embodiment shown in the drawings the channel 32 is spaced about 15mm from the trailing edge 26, with the channel having a thickness of about 5mm.
- the channel 32 is in the shape of a 'dove-tail', as best seen in Figure 6.
- the dove-tail has sides 37 oriented at about 60° to the surface of the high pressure face 20.
- the channel has a base 35 substantially parallel to the surface of the high pressure face 20.
- the channel 32 has a depth of about 3.4mm, being about half the blade thickness.
- the channel 32 includes an introducing region 38 at the first end, the introducing region 38 being substantially rectangular in cross section, and being wider than the remainder of the channel 32.
- the introducing region 38 is tapered in depth, from the surface of the high pressure face 20 to the depth of the remainder of the channel 32.
- the channel 32 is arranged to receive an adjustment means in the form of a protruding strip 40.
- a suitable protruding strip 40 can be seen in cross section in Figure 6.
- the protruding strip 40 is elongate, and of substantially constant cross-sectional shape. It comprises an engaging portion 42 and an outwardly projecting portion 44.
- the engaging portion 42 is complementary in shape to the channel 32.
- this is a 'dove-tail' configuration, but it will be appreciated that other configurations may be used.
- the outwardly projecting portion 44 extends away from the engaging portion 42 such that, when the engaging portion 42 is engaged within the channel 32, the outwardly projecting portion 44 juts outwardly from the high pressure face 20. In the arrangement of the drawings the outwardly projecting portion 44 is substantially perpendicular to the high pressure face 20.
- the protruding strip 40 may be made of any suitable material. Possible materials include both nylon and polyurethane.
- the protruding strip 40 may be engaged with the channel 32 by sliding engagement.
- the strip 40 is introduced into the channel 32 through the introducing region 38.
- the effect of the engagement of the protruding strip 40 into the channel 32 is to alter the hydrodynamic properties of the blade 12 and thus the propeller 10.
- the engagement of strips 40 into each blade 12 has the effect of increasing the effective pitch of the propeller 10.
- the flow is instead from the leading edge 24 to an upper edge 46 of the outwardly projecting portion 44. This reduces the angle of water flow relative to the longitudinal direction of the hub 14, effectively increasing the pitch of the propeller 10.
- the total change in effective pitch is equal to a superposition of the pitch caused by angular increase (Pi) and pitch change due to deflection (PD).
- the total change in effective pitch over the blade can be obtained by averaging over a range of radii.
- the length of the channel 32, and the location of Its ends 34 and 36, will significantly affect the change in hydrodynamic properties caused by use of the strips 40. It is considered that having the curve at the second end 36 of the channel 32 increases the deflection effect caused by water pressure. It is also considered that having the lift generated by the portion of the blade close to the hub 14 is small, and therefore the position of the first end 34 of the channel may not be as significant.
- a propeller 10 In use, it is anticipated that a propeller 10 will be supplied with a plurality of sets of protruding strips 40, each set varying from another by the height of its projecting portions 44. In this way, the effective pitch can be chosen according to the conditions in which the propeller 10 is to operate.
- the procedure for constructing a propeller begins by consideration of a desired mean pitch.
- a desired mean pitch is determined.
- the above equation can be implemented to design a propeller having a nominal pitch less than the desired mean, but which achieves the desired mean with use of a strip having a projecting portion of, for instance, 1.5mm.
- an appropriate channel 32 can then be machined into each propeller blade 14. Following completion of the machining process, an initial strip 40 (with 1.5mm height in this example) can be inserted into the channel 32. Whilst the invention has been described with reference to the changing of pitch, it will be appreciated that suitable placement of the channel 32 may enable the invention to be used to vary other hydrodynamic properties of the blades 12. It may be possible, for instance, to employ the invention on the low pressure face 22 to reduce or control the onset of cavitation.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/526,176 US8517683B2 (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
EP08700449.5A EP2117921B1 (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
ES08700449.5T ES2588232T3 (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
CN2008800045378A CN101616839B (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
AU2008213740A AU2008213740B2 (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007900622 | 2007-02-08 | ||
AU2007900622A AU2007900622A0 (en) | 2007-02-08 | Pitch adjustment means marine propeller |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008095259A1 WO2008095259A1 (en) | 2008-08-14 |
WO2008095259A9 true WO2008095259A9 (en) | 2015-05-28 |
Family
ID=39681197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2008/000162 WO2008095259A1 (en) | 2007-02-08 | 2008-02-08 | Marine propeller pitch adjustment means |
Country Status (6)
Country | Link |
---|---|
US (1) | US8517683B2 (en) |
EP (1) | EP2117921B1 (en) |
CN (1) | CN101616839B (en) |
AU (1) | AU2008213740B2 (en) |
ES (1) | ES2588232T3 (en) |
WO (1) | WO2008095259A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8696318B2 (en) * | 2010-03-05 | 2014-04-15 | Twin Disc, Inc. | Stepped surface propeller |
US20150217846A1 (en) * | 2012-07-31 | 2015-08-06 | Russel Ian Hawkins | Propeller Including a Blade Back Flow Guide |
EP3177838B1 (en) | 2014-08-05 | 2021-01-06 | Biomerenewables Inc. | Fluid-redirecting structure |
DK3177524T3 (en) | 2014-08-05 | 2021-02-15 | Biomerenewables Inc | Wind turbine rotor blade |
US11035340B2 (en) | 2014-08-05 | 2021-06-15 | Biomerenewables Inc. | Fluidic turbine structure |
BR112017002319B1 (en) | 2014-08-05 | 2022-09-13 | Ryan Church | RIGID FIN STRUCTURE ADAPTED TO CROSSING A FLUID ENVIRONMENT, TURBINE AND AIRCRAFT |
JP6989133B2 (en) | 2015-09-04 | 2022-01-05 | ラトガース ザ ステイト ユニバーシティー オブ ニュージャージー | Feedback-controlled electroporation microdevice for high throughput, efficient molecular delivery to a single cell |
CN107618644B (en) * | 2017-08-22 | 2019-07-16 | 哈尔滨工程大学 | A kind of deformable propeller |
CN108791787B (en) * | 2017-09-20 | 2019-08-13 | 航天晨光(福建)管业科技有限公司 | A kind of adjustable type propeller protective device |
US10882593B1 (en) * | 2019-12-10 | 2021-01-05 | Gary Alan Ledford | Peller blade with a flap |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1446011A (en) | 1921-07-05 | 1923-02-20 | Jackson Robert Cattley | Propeller |
US2099229A (en) * | 1936-01-15 | 1937-11-16 | Possenheim Louis | Fin equipped rudder |
GB496700A (en) * | 1937-08-19 | 1938-12-05 | Edgar Allan Wawn | Improvements relating to screw and like propellers |
US2498170A (en) * | 1946-06-04 | 1950-02-21 | Meier Gustav | Propeller blades |
US2978040A (en) | 1958-02-04 | 1961-04-04 | Oscar A Wirkkala | Marine propeller |
US2990889A (en) * | 1959-10-19 | 1961-07-04 | Merrell V Welch | Propeller blade sock |
US3812812A (en) * | 1973-06-25 | 1974-05-28 | M Hurwitz | Trolling propeller with self adjusting hydrodynamic spoilers |
US4047835A (en) * | 1976-08-02 | 1977-09-13 | Arthur Charles Hornung | High efficiency propeller |
US5180286A (en) * | 1990-09-25 | 1993-01-19 | Dean Peter E | Propeller assembly |
DE19647102A1 (en) * | 1996-11-14 | 1998-05-20 | Philippe Arribi | Flow body |
US5791874A (en) * | 1997-01-23 | 1998-08-11 | Brunswick Corporation | Marine propeller with adjustable cupping |
US6467422B1 (en) * | 1998-05-06 | 2002-10-22 | Elms Austrialia Pty Ltd. | Hydrofoil device |
CN2467401Y (en) * | 2001-02-21 | 2001-12-26 | 辛文 | Efficient bionic impeller or propeller |
SE523311C2 (en) * | 2003-06-26 | 2004-04-13 | Ragnar Winberg | Boat propeller, has propeller blades covered on both sides with films having outer layer of polyfluoroethylene |
US7040940B2 (en) * | 2004-04-20 | 2006-05-09 | Ab Volvo | Rotatable lifting surface device having selected pitch distribution and camber profile |
CN1644879A (en) * | 2005-01-18 | 2005-07-27 | 乐金湘 | Rotary blades |
-
2008
- 2008-02-08 US US12/526,176 patent/US8517683B2/en active Active
- 2008-02-08 ES ES08700449.5T patent/ES2588232T3/en active Active
- 2008-02-08 EP EP08700449.5A patent/EP2117921B1/en active Active
- 2008-02-08 CN CN2008800045378A patent/CN101616839B/en active Active
- 2008-02-08 WO PCT/AU2008/000162 patent/WO2008095259A1/en active Application Filing
- 2008-02-08 AU AU2008213740A patent/AU2008213740B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
AU2008213740B2 (en) | 2013-02-07 |
US8517683B2 (en) | 2013-08-27 |
US20100008780A1 (en) | 2010-01-14 |
EP2117921A1 (en) | 2009-11-18 |
EP2117921A4 (en) | 2013-07-24 |
CN101616839A (en) | 2009-12-30 |
CN101616839B (en) | 2013-03-13 |
AU2008213740A1 (en) | 2008-08-14 |
WO2008095259A1 (en) | 2008-08-14 |
ES2588232T3 (en) | 2016-10-31 |
EP2117921B1 (en) | 2016-07-06 |
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