CN111976937A - Sweepback wing type propulsion efficiency improving device - Google Patents
Sweepback wing type propulsion efficiency improving device Download PDFInfo
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- CN111976937A CN111976937A CN202010904518.3A CN202010904518A CN111976937A CN 111976937 A CN111976937 A CN 111976937A CN 202010904518 A CN202010904518 A CN 202010904518A CN 111976937 A CN111976937 A CN 111976937A
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- wing
- guide vane
- guide
- propeller
- stern shaft
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- 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
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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 invention discloses a sweepback wing type propulsion efficiency improving device which comprises a propeller arranged at the stern and a front guide wheel arranged in front of the propeller, wherein the front guide wheel comprises a plurality of sweepback wing type guide vanes and an arc guide pipe arranged at the tip of each guide vane, and each guide vane comprises a front wing and a rear wing, the front wing is arranged along the radial direction of a stern shaft of a ship body and is connected with the ship body, and the rear wing is connected to the upper end of the front wing and inclines backwards. The device has a relatively light structure, is convenient to process and easy to install and position, can be designed in a targeted manner aiming at specific ship types, reduces the resistance of an appendage, generates favorable prewhirl, improves a wake field, improves the propelling efficiency and achieves the purpose of energy conservation.
Description
Technical Field
The invention belongs to the ship propulsion technology, and particularly relates to a sweepback wing type propulsion efficiency improving device.
Background
The scientific and technological development of the current society is extremely rapid, meanwhile, the energy resource exhaustion on the earth and the deterioration speed of human living environment are greatly accelerated, the strict requirements of the international maritime organization on the ship efficiency index are promoted, the green development becomes the main melody in recent years, and the green shipping is also becoming a new investment tuyere of an investment organization. In the field of ship rapidity research, the ship profile can be continuously optimized without any residue, and the propulsion efficiency of the ship can be improved by designing and installing a hydrodynamic energy-saving device, so that the energy consumption of the ship is reduced. The hydrodynamic force economizer has the characteristics of easy preparation easy installation in the aspect of actual manufacturing installation, and disposable investment can be ignored to newly-built boats and ships, to the transformation of sailing boats and ships originally alright retrieve through shipping fuel-economizing within one year usually, and the boats and ships are bigger, and the recovery cycle is shorter, uses safe and reliable, maintenance is convenient moreover, does not have the problem of twice pollution and emission.
The front guide wheel is a typical front energy-saving device, which is a current mainstream hydrodynamic energy-saving device, such as a mews conduit (invented by Becker ship System, all called as "device for the reduction of a vessel's energy recovery for propulsion") and a light-beam type front guide wheel (patent number: zl.201310271762.0), etc., and is composed of a plurality of straight-blade stators and a conduit, and can be called as a straight-blade type front guide wheel.
However, the front guide wheel is used as an additive fixed in front of the propeller outside the ship body, the streamline design of the ship body is broken, and therefore resistance is increased. The device must also be close to the propeller in order to produce a propeller inflow prewhirl of sufficient strength, but the suction effect produced by the rotation of the propeller increases the on-body resistance, which is detrimental to energy saving. The propeller exciting force generated when the propeller runs in the ship stern uneven wake field can cause the vibration of a ship body structure, and the fatigue damage of the structure is easily caused by the overlarge vibration. The design of the front guide wheel should be far away from a vibration source as far as possible so as to avoid fatigue damage. However, in order to produce a propeller inflow prewhirl of sufficient strength, the device must be close to the propeller, which is prone to structural fatigue damage. Drag reduction and vibration damping must be considered when designing the foreducts, i.e. the mounting location of the foreducts needs to be remote from the propeller. The front guide pipe must generate inflow prerotation with enough strength, namely the installation position of the front guide pipe needs to be close to the propeller. This is a technical bottleneck that needs to be faced in designing such leading idler.
With the increasing performance of the whole ship, the straight blade type front guide wheel in the mainstream mode has the trend of weakening the energy-saving effect to a certain extent, and in the aspect of published information, the adverse effect of weakening the propeller exciting force on the front guide wheel is not considered in the appearance design of the front guide wheel.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a sweepback wing type propulsion efficiency improving device, which effectively overcomes the contradiction between resistance reduction, vibration reduction and prerotation increase and has the advantages of short design period and good energy-saving effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a sweepback wing formula impels efficiency to improve device, is including locating the screw of stern and locating the leading guide pulley in screw the place ahead which characterized in that: the front guide wheel comprises a plurality of sweepback wing type guide vanes and arc guide pipes arranged at the tips of the guide vanes, and each guide vane comprises a front wing which is arranged along the radial direction of a stern shaft of the ship body and is connected with the ship body, and a rear wing which is connected to the upper end of the front wing and inclines backwards.
The distance between the front wing and the disc surface of the propeller is 15-25% of the diameter of the propeller; the distance between the rear wing and the surface of the propeller plate is 10-20% of the diameter of the propeller.
The guide vanes comprise a first guide vane on a port side, a second guide vane on a port side and a first guide vane on a starboard side, wherein the included angle of the first guide vane and the middle longitudinal section of the stern shaft is 70-80 degrees, the included angle of the second guide vane and the middle longitudinal section of the stern shaft is 25-35 degrees, and the included angle of the first guide vane on a starboard side and the middle longitudinal section of the stern shaft is 30-40 degrees.
The guide vane also comprises a starboard second guide vane which forms an included angle of 5-15 degrees with the middle longitudinal section of the stern shaft.
The spreading length of the guide vane is 0.4-0.8 times of the radius of the propeller.
The geometrical attack angles of the front wing and the rear wing of the first guide vane of the port board and a reference line parallel to a stern shaft are-8 degrees; the geometrical attack angles of the front wing and the rear wing of the second guide vane on the port board and a reference line parallel to the stern shaft are-8 degrees; the geometrical attack angles of the front wing and the rear wing of the starboard first guide vane and a reference line parallel to the stern shaft are 5-20 degrees.
The geometrical attack angles of the front wing and the rear wing of the starboard second guide vane and a reference line parallel to the stern shaft are 5-15 degrees.
The central point of the arc-shaped guide pipe is positioned right above the stern shaft.
By adopting the sweepback wing type propulsion efficiency improving device, the contradiction between resistance reduction, vibration reduction and prerotation increase can be effectively overcome through the sweepback wing type design, and the device has the advantages of short design period and good energy-saving effect. Because the installation position is far away from the propeller, the influence of the excitation force of the propeller on the main body part of the device is weakened. The test result shows that the device can produce obvious energy-saving effect under the design working condition, the specific energy-saving condition depends on different ship types, and the device has popularization and application values.
Drawings
FIG. 1 is a sectional view of a sweepback wing type propulsive efficiency improving apparatus of the present invention;
FIG. 2 is an axial view of the aft swept wing propulsion efficiency improving apparatus of the present invention;
FIG. 3 is a schematic illustration of the geometric angle of attack of the port first vane of the present invention;
FIG. 4 is a schematic illustration of the geometric angle of attack of the inventive port second vane;
FIG. 5 is a schematic illustration of the geometric angle of attack of the inventive starboard first vane.
Detailed Description
As shown in fig. 1 to 2, the device for improving propulsion efficiency of a swept-back wing type according to the present invention also includes a propeller 1 provided at the stern and a front guide wheel 2 provided in a front region of the propeller 1, as in the prior art, except that the front guide wheel 2 includes a plurality of swept-back wing type guide vanes 3 and an arc guide tube 4 installed at a tip 31 of the guide vane 3, and each swept-back wing type guide vane 3 includes a front wing 32 provided along a stern shaft 6 of a hull 5 in a radial direction and connected to the hull 5, and a rear wing 33 connected to an upper end of the front wing 32 and inclined rearward (i.e., toward the propeller 1 located rearward). The front wing 32 is connected with the ship body 5 in a welding mode, the connecting position is near a stern shaft 6 of the ship body 5, the front wing 32 is far away from the propeller 1, the distance between the front wing 32 and the surface of the propeller 1 is 15% -25% of the diameter of the propeller 1, the distance between the rear wing 33 and the surface of the propeller 1 is 15% -25%, the distance between the rear wing 33 and the surface of the propeller 1 is 10% -20% of the diameter of the propeller 1, and therefore the sweepback wing type guide vane 3 is formed.
The sweepback wing type guide vanes 3 are asymmetrically distributed in the circumferential direction by taking a stern shaft 6 as a center, and the span length L of each guide vane 3 is generally different from 0.4 to 0.8 time of the radius of the propeller 1. As an embodiment, the number of the guide vanes 3 can adopt 3, which are respectively a first guide vane 3a on the port side with an included angle of 70-80 degrees with the middle longitudinal section a of the stern shaft 6, a second guide vane 3b on the port side with an included angle of 25-35 degrees with the middle longitudinal section a of the stern shaft 6, and a first guide vane 3c on the starboard side with an included angle of 30-40 degrees with the middle longitudinal section of the stern shaft 6.
Referring to fig. 3-5, the airfoil profile of each of the swept-blade guide vanes 3 is the same, but the geometrical attack angles of the front and rear wings of each of the swept-blade guide vanes 3 and the reference line (parallel to the stern shaft 6) are different: the geometrical attack angles of the front wing 32a and the rear wing 33a of the first guide vane 3a on the port and a reference line parallel to the stern shaft 6 are-8 degrees; the geometrical attack angles of the front wing and the rear wing of the second guide vane 3b on the port and a reference line parallel to the stern shaft 6 are-8 degrees; the geometrical angle of attack b of the front and rear wings of the starboard first guide vane 3c from a reference line parallel to the stern shaft 6 is 5-20 °.
Of course, according to the requirement of structural strength, a corresponding backswept wing type guide vane 3 may be added at a corresponding position, for example, a piece of backswept wing type guide vane 3, that is, a starboard second guide vane 3d, is added at a position of 10 ± 5 ° to the right of the starboard of the middle longitudinal section of the stern shaft 6. The geometrical angle of attack of the front and rear wings 33 of the starboard second guide vane 3d and a reference line parallel to the stern shaft 6 is 5-15 °.
It should be noted that the present invention can also adjust the airfoil profile shape, the geometric attack angle of each front and rear wing 33, the extension of each guide vane 3 and the circumferential distribution angle thereof according to the actual wake flow condition of the ship. Compared with the traditional straight-blade type preposed guide pipe (such as a Mewis guide pipe or a light-beam type preposed guide wheel), on the premise that sufficient inflow prerotation of the propeller 1 is guaranteed to be generated, the installation position of the whole device is moved forwards due to the design of the backswept wing type guide vane 3, most of structures are far away from the propeller 1, the vibration influence of exciting force generated by the running of the propeller 1 on the whole device is relieved to a certain degree, the influence of the suction effect of the propeller 1 on the device is weakened, and the additional resistance generated by the device is reduced. Whereas the inflow pre-swirl of the propeller 1 is mainly generated and effectively ensured by the rear wing 33 close to the propeller 1.
The arc duct 4 is attached to the tip 31 of the guide vane 3 and is connected to the hull 5 by welding. The arc-shaped guide pipe is mainly used for improving the inflow condition of the front upper half area of the propeller 1, so that the aim of improving the propelling efficiency of the propeller 1 is fulfilled. The arc-shaped conduit is in the shape of an airfoil section, and the geometric attack angle of the arc-shaped conduit and a reference line parallel to a stern shaft 6 is 0-8 degrees. The center point (i.e. the circle center) c of the arc-shaped guide pipe is positioned right above the stern shaft 6, and the distance between the center point c and the stern shaft 6 is 0.1-0.2 times of the diameter of the propeller.
In addition, the specific parameters of the sweepback wing type propulsion efficiency improving device of the invention are as follows: no matter the guide vane is extended, the guide vanes are radially distributed, the guide vane airfoil shape, the front and rear wing geometric attack angles of each guide vane, the guide duct airfoil shape, the radial geometric attack angles, the central point position of the guide duct and the like, the self-adaptive optimization design can be carried out according to the tail shape of the ship, the diameter of the propeller 1 and the structural strength requirements, but not limited to the fixed geometric shape.
In conclusion, the sweepback wing type propulsion efficiency improving device is relatively light in structure, convenient to machine and easy to install and position, can be designed in a targeted mode according to specific ship types, reduces the resistance of an appendage, generates favorable prerotation flow, improves a wake flow field, improves the propulsion efficiency and achieves the purpose of energy conservation. And, the results of numerical calculation and model test also show that: the sweepback wing type propulsion efficiency improving device has the hydrodynamic characteristics of low resistance and high efficiency, and has a very obvious energy-saving effect.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (8)
1. The utility model provides a sweepback wing formula impels efficiency to improve device, is including locating the screw of stern and locating the leading guide pulley in screw the place ahead which characterized in that: the front guide wheel comprises a plurality of sweepback wing type guide vanes and arc guide pipes arranged at the tips of the guide vanes, and each guide vane comprises a front wing which is arranged along the radial direction of a stern shaft of the ship body and is connected with the ship body, and a rear wing which is connected to the upper end of the front wing and inclines backwards.
2. The sweepback type propulsive efficiency improving apparatus according to claim 1, wherein: the distance between the front wing and the disc surface of the propeller is 15-25% of the diameter of the propeller; the distance between the rear wing and the surface of the propeller plate is 10-20% of the diameter of the propeller.
3. The sweepback type propulsive efficiency improving apparatus according to claim 1 or 2, wherein: the guide vanes comprise a first guide vane on a port side, a second guide vane on a port side and a first guide vane on a starboard side, wherein the included angle of the first guide vane and the middle longitudinal section of the stern shaft is 70-80 degrees, the included angle of the second guide vane and the middle longitudinal section of the stern shaft is 25-35 degrees, and the included angle of the first guide vane on a starboard side and the middle longitudinal section of the stern shaft is 30-40 degrees.
4. The backward swept wing type propulsion efficiency improving apparatus according to claim 3, wherein: the guide vane also comprises a starboard second guide vane which forms an included angle of 5-15 degrees with the middle longitudinal section of the stern shaft.
5. The sweepback type propulsive efficiency improving apparatus according to claim 4, wherein: the spreading length of the guide vane is 0.4-0.8 times of the radius of the propeller.
6. The backward swept wing type propulsion efficiency improving apparatus according to claim 3, wherein: the geometrical attack angles of the front wing and the rear wing of the first guide vane of the port board and a reference line parallel to a stern shaft are-8 degrees; the geometrical attack angles of the front wing and the rear wing of the second guide vane on the port board and a reference line parallel to the stern shaft are-8 degrees; the geometrical attack angles of the front wing and the rear wing of the starboard first guide vane and a reference line parallel to the stern shaft are 5-20 degrees.
7. The sweepback type propulsive efficiency improving apparatus according to claim 4, wherein: the geometrical attack angles of the front wing and the rear wing of the starboard second guide vane and a reference line parallel to the stern shaft are 5-15 degrees.
8. The sweepback type propulsive efficiency improving apparatus according to claim 1, wherein: the central point of the arc-shaped guide pipe is positioned right above the stern shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904518.3A CN111976937B (en) | 2020-09-01 | 2020-09-01 | Sweepback wing type propulsion efficiency improving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904518.3A CN111976937B (en) | 2020-09-01 | 2020-09-01 | Sweepback wing type propulsion efficiency improving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111976937A true CN111976937A (en) | 2020-11-24 |
| CN111976937B CN111976937B (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010904518.3A Active CN111976937B (en) | 2020-09-01 | 2020-09-01 | Sweepback wing type propulsion efficiency improving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379752A (en) * | 2021-12-09 | 2022-04-22 | 南通海国机械有限公司 | Leading guide pulley of prewhirling for boats and ships |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020011A (en) * | 2009-09-17 | 2011-04-20 | 大宇造船海洋株式会社 | Ducted pre-swirl stator assembly |
| CN103332281A (en) * | 2013-07-19 | 2013-10-02 | 上海船舶研究设计院 | Pre-rotation triangular conduit for right-handed rotation single screw vessel |
| CN103661898A (en) * | 2013-12-19 | 2014-03-26 | 中国船舶科学研究中心上海分部 | Triangle front-arranged guide wheel |
| KR20150075659A (en) * | 2013-12-26 | 2015-07-06 | 대우조선해양 주식회사 | Pre-swirl stator of ship |
| CN212921938U (en) * | 2020-09-01 | 2021-04-09 | 上海船舶运输科学研究所 | Rear inclined asymmetric front guide pipe of ship |
-
2020
- 2020-09-01 CN CN202010904518.3A patent/CN111976937B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020011A (en) * | 2009-09-17 | 2011-04-20 | 大宇造船海洋株式会社 | Ducted pre-swirl stator assembly |
| CN103332281A (en) * | 2013-07-19 | 2013-10-02 | 上海船舶研究设计院 | Pre-rotation triangular conduit for right-handed rotation single screw vessel |
| CN103661898A (en) * | 2013-12-19 | 2014-03-26 | 中国船舶科学研究中心上海分部 | Triangle front-arranged guide wheel |
| KR20150075659A (en) * | 2013-12-26 | 2015-07-06 | 대우조선해양 주식회사 | Pre-swirl stator of ship |
| CN212921938U (en) * | 2020-09-01 | 2021-04-09 | 上海船舶运输科学研究所 | Rear inclined asymmetric front guide pipe of ship |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379752A (en) * | 2021-12-09 | 2022-04-22 | 南通海国机械有限公司 | Leading guide pulley of prewhirling for boats and ships |
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| CN111976937B (en) | 2022-09-16 |
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