CN110040231A - A kind of asymmetric conduit for ship rear screw shaft - Google Patents
A kind of asymmetric conduit for ship rear screw shaft Download PDFInfo
- Publication number
- CN110040231A CN110040231A CN201910392803.9A CN201910392803A CN110040231A CN 110040231 A CN110040231 A CN 110040231A CN 201910392803 A CN201910392803 A CN 201910392803A CN 110040231 A CN110040231 A CN 110040231A
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- curve
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- conduit
- attack
- angle
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
- B63H5/15—Nozzles, e.g. Kort-type
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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)
Abstract
The present invention is to provide a kind of asymmetric conduits for ship rear screw shaft.Conduit bilateral symmetry, duct entry and outlet are irregular curve and not planar, the top indent of entrance curve, middle part and bottom are smooth, have pointed raised at the top of exit curve and linearly decline from top to middle part curve, there is evagination at middle part, camber and the angle of attack along conduit perimeter section aerofoil profile is axially varying, and each section shape and thickness along catheter length direction be not identical.Asymmetric conduit of the invention can improve the wake of stern, homogenize the asymmetric wake at paddle disk, reduce the vibration and noise and the efficiency for improving propeller of propeller, to achieve the effect that improve efficiency and improve vibration noise.
Description
Technical field
The present invention relates to a kind of conduit, specifically a kind of conduit for ship rear screw shaft.
Background technique
When the objects such as ship move in water, since the subsequent speed uneven distribution of object will generate Wake Field.No
Uniform Wake Field can have an impact propeller, and the fierce variation of water flow, can make propeller blade at propeller paddle disk
Load is uneven, so that ship tail portion be made to generate great exciting force and noise.Since 20 th century laters, ship's wake field is not
Symmetry has received widespread attention, and then many methods for improving propeller disk wake occurs.There are mainly two types of method,
One is optimization stern lines design is passed through, so as to improve potential wake.Another be commutated appendages are aboard ship installed, such as
Rectify some special devices such as fin, compensating duct, Preadipocyte factor-1.Wherein, ducted propeller, which can play, reduces stern exciting force
With the effect of noise.The propeller assembly that ducted propeller is made of propeller and diversion pipe, the annular conduit outside paddle
Both the wake flow diameter near propeller had been can control, limitation wake flow is shunk, and reduces wake losses；Also it can use steering nozzle
The direction for controlling wake flow, improves the maneuverability of ship with this.And traditional conduit primarily serves and changes propeller load and mention
It is smaller for the effect for improving potential wake, reduction stern exciting force and noise for the effect of additional thrust.
Summary of the invention
The purpose of the present invention is to provide the asymmetric conduits for ship rear screw shaft that one kind can improve potential wake.
The object of the present invention is achieved like this:
Conduit bilateral symmetry, duct entry and outlet are irregular curve and not planar, the top of entrance curve
Indent, middle part and bottom are smooth, have at the top of exit curve pointed protrusion and linearly decline from top to middle part curve, in
There is evagination in portion, and the camber and the angle of attack along conduit perimeter section aerofoil profile are axially varying, and each along catheter length direction cuts open
Face shape and thickness is not identical.
The present invention may also include:
The camber and the angle of attack along conduit perimeter section aerofoil profile described in 1. be axially varying to be referred to from up to down along leading
The t/L that the shape of 5 sections of pipe perimeter equidistantly distributed is respectively as follows: the first section 1 is 0.15, -5 ° of the position angle of attack, top half
Curve concaves, and the amplitude that lower half portion curve also concaves and concaves is greater than top half curve；The t/L of second section 2
It is 0.1,10 ° of the angle of attack, top half curve is consistent with lower half portion curve radian；The t/L of third section 3 is 0.145, the angle of attack
It is -4 °, top half curve concaves, and the amplitude that lower half portion curve also concaves and concaves is greater than top half curve；
The t/L of 4th section 4 is 0.09, and the angle of attack is -4 °, and top half curve is consistent with lower half portion curve radian；5th section 5
T/L is 0.15, and the angle of attack is -3 °, and lower half portion curve evagination, wherein t is maximum gauge, L is length.
The each section shape and thickness along catheter length direction described in 2. be not identical to be referred to from entrance to outlet along leading
The shape of three sections in length of tube direction is respectively as follows: the top indent of the section close to entrance, and middle part evagination, bottom is smooth；
Close to the pointed evagination in top of the section of outlet, middle part evagination；The middle part evagination of the section of medium position, global shape are smooth.
The present invention provides a kind of novel asymmetric conduits, can significantly improve the asymmetric wake of stern, make stern
Wake is average, to achieve the effect that improve efficiency and improve vibration.
Asymmetric conduit of the invention uses acceleration duct form in top half, makes the axial speed of water flow in front of propeller
Degree increases, and increases the flow velocity of paddle disk lower half portion fluid, and conduit is made to generate part thrust, so that improving propeller promotes effect
Rate；Lower half portion uses decelerating duct form, and the axial velocity of water flow in front of propeller is made to slow down, and shunts paddle disk lower half
The flow velocity of body reduces, and can delay the generation of propeller cavitation phenomenon, to achieve the purpose that noise reduction.The novel asymmetric conduit
The wake that stern can be improved homogenizes the asymmetric wake at paddle disk, reduces the vibration of propeller and noise and improves
The efficiency of propeller, to achieve the effect that improve efficiency and improve vibration noise.
Detailed description of the invention
Fig. 1 and Fig. 2 is the structural schematic diagram of the different angle of the asymmetric conduit for ship rear screw shaft of the invention；
Fig. 3 is the asymmetric conduit for ship rear screw shaft along the position view of 5 sections of conduit perimeter；
Fig. 4 a to Fig. 4 e is the line style schematic diagram of 5 sections in Fig. 3, wherein Fig. 4 a is the first section 1, Fig. 4 b is second
Section 2, Fig. 4 c are third section 3, Fig. 4 d is the 4th section 4, Fig. 4 e is the 5th section 5；
Fig. 5 is the asymmetric conduit for ship rear screw shaft along the position view of 3 sections in catheter length direction；
Fig. 6 a to Fig. 6 c is the diagrammatic cross-section in Fig. 5, wherein Fig. 6 a is A-A section, Fig. 6 b is B-B section, Fig. 6 c is
C-C section；
Fig. 7 is the asymmetric duct entry schematic diagram for ship rear screw shaft；
Fig. 8 is the asymmetric conduit outlet schematic diagram for ship rear screw shaft；
Fig. 9 is 1 table of offsets of the first section；
Figure 10 is 2 table of offsets of the second section；
Figure 11 is 3 table of offsets of third section；
Figure 12 is 4 table of offsets of the 4th section；
Figure 13 is 5 table of offsets of the 5th section.
Specific embodiment
It illustrates below and the present invention is described in more detail.
Asymmetric conduit bilateral symmetry for ship rear screw shaft of the invention combined with Figure 1 and Figure 2, section is along perimeter
Changed according to the wake of stern.The camber and the angle of attack of its aerofoil profile are different in axial difference according to potential wake.Thereon
Half part uses acceleration duct form, increases the axial velocity of water flow in front of propeller；Lower half portion uses decelerating duct shape
Formula reduces the axial velocity of water flow in front of propeller.To make the wake at propeller disk homogenize, to improve spiral shell
Paddle efficiency is revolved, and greatly reduces vibration and the noise of propeller.
In conjunction with Fig. 3 and Fig. 4 a to Fig. 4 e, 5 sections of asymmetric 5 positions of conduit have been marked in Fig. 3.The asymmetry
Conduit is different along the shape of each section of circumferential direction.The t/L (maximum gauge/length) of section 1 is 0.15, the angle of attack-
5°.The t/L (maximum gauge/length) of section 3 is 0.145, and the angle of attack is -4 °.The shape of section 1 and section 3 is roughly the same,
Top half curve slight inward is recessed, and lower half portion curve has larger indent.The t/L (maximum gauge/length) of section 2 is 0.1,
10 ° of the angle of attack.The t/L (maximum gauge/length) of section 4 be 0.09, -4 ° of the angle of attack.The shape of section 2 and section 4 is roughly the same,
Top half curve and lower half portion curve radian are almost the same.The t/L (maximum gauge/length) of section 5 is 0.15, the angle of attack-
3 °, and lower half portion curve evagination.5 sections are different, and the offset of 5 sections is listed in Fig. 9 to Figure 13 respectively.
In conjunction with Fig. 5 and Fig. 6 a to Fig. 6 c, the asymmetry conduit each section shape along its length and thickness are not
It is identical.For cross section A-A close to entrance, shape is similar with entrance, has obvious indent at top, has evagination at middle part, bottom is flat
It is sliding；For section C-C close to outlet, shape is similar with outlet, has obvious pointed evagination at top, also there is obvious evagination at middle part.
Section B-B is located at conduit medium position, since the angle of attack direction of section 3 and section 2,4 is inconsistent, has in the middle part of section B-B bright
Aobvious evagination, top and bottom indent is unobvious, and global shape is relatively smooth.
In conjunction with Fig. 7 and Fig. 8, the asymmetry duct entry and outlet are irregular curve, and not planar.Due to
1 angle of attack of section is negative, and 2 angle of attack of section is positive, and entrance curve has obvious indent at top, smooth at middle part and bottom.Due to cuing open
Face 1 and the angle of attack direction of section 2 are inconsistent, and exit curve has obvious pointed protrusion at top, and several from top to middle part curve
Linearly decline, also has obvious evagination at middle part.Since the tail portion of section 2,4,5 is inwardly received, outlet size is big compared with entrance
It is small to be obviously reduced.
Claims (3)
1. a kind of asymmetric conduit for ship rear screw shaft, it is characterized in that: conduit bilateral symmetry, duct entry and outlet are
Irregular curve and not planar, the top indent of entrance curve, middle part and bottom are smooth, have at the top of exit curve pointed
Protrusion and linearly decline from top to middle part curve, there is evagination at middle part, along conduit perimeter section aerofoil profile camber with
The angle of attack is axially varying, and each section shape and thickness along catheter length direction be not identical.
2. the asymmetric conduit according to claim 1 for ship rear screw shaft, it is characterized in that: described along conduit perimeter
The camber and the angle of attack of section aerofoil profile are axially varying to be referred to from up to down along 5 sections of conduit perimeter equidistantly distributed
The t/L that shape is respectively as follows: the first section (1) is 0.15, and -5 ° of the position angle of attack, top half curve concaves, lower half portion curve
It concaves and the amplitude to concave is greater than top half curve；The t/L of second section (2) is 0.1, and 10 ° of the angle of attack, top half is bent
Line is consistent with lower half portion curve radian；The t/L of third section (3) is 0.145, and the angle of attack is -4 °, and top half curve is inside
Recessed, the amplitude that lower half portion curve also concaves and concaves is greater than top half curve；The t/L of 4th section (4) is 0.09,
The angle of attack is -4 °, and top half curve is consistent with lower half portion curve radian；The t/L of 5th section (5) be 0.15, the angle of attack be-
3 °, lower half portion curve evagination, wherein t is maximum gauge, L is length.
3. the asymmetric conduit according to claim 1 or 2 for ship rear screw shaft, it is characterized in that: described along conduit
The each section shape and thickness of length direction be not identical to be referred to from entrance to three sections exported along catheter length direction
Shape is respectively as follows: the top indent of the section close to entrance, and middle part evagination, bottom is smooth；Close to the top point of the section of outlet
Shape evagination, middle part evagination；The middle part evagination of the section of medium position, global shape are smooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392803.9A CN110040231A (en) | 2019-05-13 | 2019-05-13 | A kind of asymmetric conduit for ship rear screw shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392803.9A CN110040231A (en) | 2019-05-13 | 2019-05-13 | A kind of asymmetric conduit for ship rear screw shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110040231A true CN110040231A (en) | 2019-07-23 |
Family
ID=67281664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910392803.9A Pending CN110040231A (en) | 2019-05-13 | 2019-05-13 | A kind of asymmetric conduit for ship rear screw shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110040231A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1227354A (en) * | 1967-02-20 | 1971-04-07 | ||
| CN101434292A (en) * | 2007-11-16 | 2009-05-20 | 贝克船舶系统有限及两合公司 | Kort nozzle |
| CN202368781U (en) * | 2011-12-12 | 2012-08-08 | 江苏华海船舶设计有限公司 | Marine efficient and energy-saving guide pipe |
| CN104002950A (en) * | 2014-05-06 | 2014-08-27 | 浙江海洋学院 | Novel energy-saving pre-swirled wake-equalizing duct for fishing boat |
| CN107554734A (en) * | 2017-07-20 | 2018-01-09 | 哈尔滨工程大学 | A kind of controllable asymmetric catheter propeller of aerofoil profile |
| CN107750221A (en) * | 2015-04-28 | 2018-03-02 | 劳斯莱斯船舶股份有限公司 | Modularization propulsion plant nozzle |
| CN207791102U (en) * | 2014-11-14 | 2018-08-31 | 韩国海洋科学技术院 | Ship movement control device using combination of asymmetric guide pipe and fin structure |
-
2019
- 2019-05-13 CN CN201910392803.9A patent/CN110040231A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1227354A (en) * | 1967-02-20 | 1971-04-07 | ||
| CN101434292A (en) * | 2007-11-16 | 2009-05-20 | 贝克船舶系统有限及两合公司 | Kort nozzle |
| CN202368781U (en) * | 2011-12-12 | 2012-08-08 | 江苏华海船舶设计有限公司 | Marine efficient and energy-saving guide pipe |
| CN104002950A (en) * | 2014-05-06 | 2014-08-27 | 浙江海洋学院 | Novel energy-saving pre-swirled wake-equalizing duct for fishing boat |
| CN207791102U (en) * | 2014-11-14 | 2018-08-31 | 韩国海洋科学技术院 | Ship movement control device using combination of asymmetric guide pipe and fin structure |
| CN107750221A (en) * | 2015-04-28 | 2018-03-02 | 劳斯莱斯船舶股份有限公司 | Modularization propulsion plant nozzle |
| CN107554734A (en) * | 2017-07-20 | 2018-01-09 | 哈尔滨工程大学 | A kind of controllable asymmetric catheter propeller of aerofoil profile |
Non-Patent Citations (1)
| Title |
|---|
| 郭婷婷: "船用螺旋桨的不对称导管的设计与应用", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190723 |
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| RJ01 | Rejection of invention patent application after publication |