CN104002950A - Novel energy-saving pre-swirled wake-equalizing duct for fishing boat - Google Patents
Novel energy-saving pre-swirled wake-equalizing duct for fishing boat Download PDFInfo
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- CN104002950A CN104002950A CN201410187966.0A CN201410187966A CN104002950A CN 104002950 A CN104002950 A CN 104002950A CN 201410187966 A CN201410187966 A CN 201410187966A CN 104002950 A CN104002950 A CN 104002950A
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- prewhirling
- flow
- duct wall
- flow deflectors
- wake
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Abstract
The invention discloses a novel energy-saving pre-swirled wake-equalizing duct for a fishing boat. The novel energy-saving pre-swirled wake-equalizing duct is installed to a stern, in front of a propeller and above a propeller shaft. The novel energy-saving pre-swirled wake-equalizing duct comprises a left pressurization duct wall, a right pressurization duct wall, central welding steel and six pre-swirled flow deflectors. The left pressurization duct wall and the right pressurization duct wall are both of an open circular arc shape, the front end of the left pressurization duct wall and the front end of the right pressurization duct wall are larger than the rear end of the left pressurization duct wall and the rear end of the right pressurization duct wall respectively. The radius of the left pressurization duct wall is slightly smaller than that of the right pressurization duct wall. The left pressurization duct wall and the right pressurization duct wall are welded into a whole. One end of each pre-swirled flow deflector is welded to the central welding steel which serves as the central axis, and the other end of each pre-swirled flow deflector is welded to the inner wall of the left pressurization duct wall and the inner wall of the right pressurization duct wall. According to the novel energy-saving pre-swirled wake-equalizing duct, additional thrust can be produced on the propeller, so that wake above the rotating propeller is more uniform and powerful, and stern flow separation can be effectively improved. As the six pre-swirled flow deflectors are arranged, pre-swirled flow can be effectively produced, the thrust of the propeller is increased, and the propulsive efficiency of the propeller is enhanced. Besides, the novel energy-saving pre-swirled wake-equalizing duct is low in manufacturing cost and good in fuel saving effect, thereby having excellent economy.
Description
Technical field
The present invention relates to a kind of fishing boat energy saver, relate in particular to the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat.
Background technology
Along with the rising of international marine fuel oil price, and the new ship energy-saving efficiency index E EDI's of International Maritime Organization (IMO) is formally effective, the new shipbuilding of China, and in obsolete vessel transformation, the attached body of applicating energy-saving is more and more general, there is a collection of preposition conduit, the attached body device of the ship energy savings such as guide wheel of prewhirling, but these energy savers, possible in theory, but in real ship application, although improved the flow field before and after screw propeller, but can not obviously promote the propulsion coefficient of screw propeller, due to the consideration of having ignored propeller propulsive efficiency, cause hull propulsion coefficient obviously not promoted.
Summary of the invention
The object of the invention is to overcome defect of the prior art and deficiency, provide a kind of novel fishing boat the energy-conservation wake compensating duct of prewhirling, the energy-conservation wake compensating duct of prewhirling of this fishing boat is by self distinctive six flow deflector of prewhirling, and left-right asymmetry pressurizing duct wall, fishing boat screw propeller flow field around can be effectively improved, fishing boat propeller propulsive efficiency can be significantly promoted again.
For addressing the above problem, the technical solution adopted in the present invention is: the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat, be arranged on stern, screw propeller front, slurry axle top, comprise left pressurizing duct wall, right pressurizing duct wall, central authorities' welding steel and six flow deflectors of prewhirling, left pressurizing duct wall and right pressurizing duct wall are the little uncovered circular arc in the large rear end of front end, the radius of left pressurizing duct wall is slightly less than the radius of right pressurizing duct wall, left, right pressurizing duct wall is integrally welded, weld with the central welding steel as center shaft one end of six flow deflectors of prewhirling, the other end is welded on a left side, on the inwall of right pressurizing duct wall.
The energy-conservation wake compensating duct of prewhirling of aforesaid a kind of novel fishing boat, six wherein said flow deflectors of prewhirling comprise flow deflector of prewhirling, No. two flow deflectors of prewhirling, No. three flow deflectors of prewhirling, No. four flow deflectors of prewhirling, prewhirl for No. five flow deflector and No. six flow deflectors of prewhirling, flow deflector of prewhirling, prewhirl for No. two flow deflector and No. three flow deflectors of prewhirling are welded on left pressurizing duct wall, and No. four flow deflectors of prewhirling, prewhirl for No. five flow deflector and No. six flow deflectors of prewhirling are welded on right pressurizing duct wall.
Compared with prior art, the invention has the beneficial effects as follows: the diameter setting that left pressurizing duct wall and right pressurizing duct wall diminish from front end to rear end gradually along captain's direction can produce additional thrust, its both wakes above front end becomes a mandarin the screw propeller that the different diameter setting in end place can make rotating is more evenly strong, and can effectively improve boattail flow and separate; Arranging of six flow deflectors of prewhirling can effectively produce preswirl, increases the thrust of screw propeller, improves the propulsion coefficient 3% of screw propeller; Low cost of manufacture of the present invention, saves fuel oil respond well, has good economy, is easy to be accepted by fisherman and shipbuilding yard.
Brief description of the drawings
Fig. 1 is perspective view of the present invention;
Fig. 2 is front elevation of the present invention;
Fig. 3 is left view of the present invention;
The 1-flow deflector 2-flow deflector 3-flow deflector 4-flow deflector 5-flow deflector 6-right pressurizing duct Bi9-of the left pressurizing duct wall of the flow deflector 7-8-center welding steel of prewhirling for No. six of prewhirling for No. five of prewhirling for No. tetra-of prewhirling for No. tri-of prewhirling for No. bis-of prewhirling for No. in above-mentioned accompanying drawing
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described.
As shown in Figure 1, the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat, comprise left pressurizing duct wall 7, right pressurizing duct wall 8, central welding steel 9 and six flow deflectors of prewhirling, left pressurizing duct wall 7 and right pressurizing duct wall 8 are the little uncovered circular arc in the large rear end of front end, the radius of left pressurizing duct wall 7 is slightly less than the radius of right pressurizing duct wall 8, left and right pressurizing duct wall is integrally welded, one end of six flow deflectors of prewhirling with weld as the central welding steel 9 of center shaft, the other end is welded on the inwall of left and right pressurizing duct wall.
As shown in Figure 1, the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat, six wherein said flow deflectors of prewhirling comprise the flow deflector 1 of prewhirling for No., the flow deflector 2 of prewhirling for No. two, the flow deflector 3 of prewhirling for No. three, the flow deflector 4 of prewhirling for No. four, No. five prewhirl flow deflector 5 and the flow deflectors 6 of prewhirling for No. six, prewhirl for No. one flow deflector 1, prewhirl for No. two flow deflector 2 and the flow deflector 3 of prewhirling for No. three is welded on left pressurizing duct wall 7, and the flow deflector 4 of prewhirling for No. four, prewhirl for No. five flow deflector 5 and the flow deflector 6 of prewhirling for No. six are welded on right pressurizing duct wall 8.
As shown in Figure 3, the energy-conservation wake compensating duct of prewhirling of this fishing boat is installed on stern, screw propeller front, and slurry axle top, the front end of large mouthful is the end that becomes a mandarin, and the rear end of osculum is for going out stream end, and the length of conduit is L, and propeller radius is R, L is set to 0.75～0.85R conventionally.
As shown in Figure 3, the front end of the pressurizing duct outer wall being made up of left pressurizing duct wall 7 and right pressurizing duct wall 8 end opening that becomes a mandarin is large, it is little that rear end goes out to flow end opening, the bus of pressurizing duct outer wall and the angle theta of exit end face are 100 °, stream is used in this design can produce extra additional thrust to screw propeller, strengthens hull efficiency.
As shown in Figure 2, left pressurizing duct wall 7 is generally got 0.3～0.45L at the radius R 1 that goes out stream end, right pressurizing duct wall 8 is generally got 0.45～0.55L at the radius R 2 that goes out stream end, the center of circle of right pressurizing duct wall 8 is positioned at the just right 0.2R1 place, the center of circle of left pressurizing duct wall 7, left pressurizing duct wall 7 is going out the different radial design of stream end from right pressurizing duct wall 8, can make flow field workload in the different propeller blade surface of curvature, and can effectively improve stern flow separation.
As shown in Figure 2, the angle α 1 of flow deflector 1 and the flow deflector 2 of prewhirling for No. two of prewhirling for No. one is 60 °, the angle α 2 of flow deflector 2 and the flow deflector 3 of prewhirling for No. three of prewhirling for No. two is 60 °, the angle α 3 of flow deflector 3 and the flow deflector 4 of prewhirling for No. four of prewhirling for No. three is 60 °, the angle α 4 of flow deflector 4 and the flow deflector 5 of prewhirling for No. five of prewhirling for No. four is 60 °, the angle α 5 of flow deflector 5 and the flow deflector 6 of prewhirling for No. six of prewhirling for No. five is 60 °, the angle α 6 of flow deflector 6 and the flow deflector 1 of prewhirling for No. of prewhirling for No. six is 60 °, the flow deflector 3 of prewhirling for No. three overlaps with the line of centers of left pressurizing duct wall 7 at the end that becomes a mandarin with the edge of No. six flow deflectors 6 of prewhirling.
As shown in Figure 1, six flow deflectors of prewhirling are curved surface stainless steel materials, and carry out rounding processing going out stream end and the end margin that becomes a mandarin.
As shown in Figure 2, the flow deflector 1 of prewhirling for No. one end margin that becomes a mandarin is 3.95 ° at the angle β 1 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, the flow deflector 2 of prewhirling for No. two end margin that becomes a mandarin is 3.95 ° at the angle β 2 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, the flow deflector 3 of prewhirling for No. three end margin that becomes a mandarin is 3.95 ° at the angle β 3 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, the flow deflector 4 of prewhirling for No. four end margin that becomes a mandarin is 3.95 ° at the angle β 4 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, the flow deflector 5 of prewhirling for No. five end margin that becomes a mandarin is 3.95 ° at the angle β 5 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, the flow deflector 6 of prewhirling for No. six end margin that becomes a mandarin is 3.95 ° at the angle β 6 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, such design can effectively produce preswirl, reduce the loss of propeller race rotating energy, and make flow field more even.
The energy-conservation wake compensating duct of prewhirling of novel fishing boat, wherein said left pressurizing duct wall 7 is stainless steel materials with right pressurizing duct wall 8.
The energy-conservation wake compensating duct of prewhirling of this fishing boat is installed on stern, screw propeller front, slurry axle top, in the time that fishing boat travels, current enter conduit by the end that becomes a mandarin, the diameter setting that left pressurizing duct wall and right pressurizing duct wall diminish from front end to rear end gradually along captain's direction can make the acceleration that becomes a mandarin of the screw propeller first half, produce additional thrust, and reduce screw propeller first half wake peak, arranging of six flow deflectors of prewhirling can make current generation prewhirl, make screw propeller to enter flow field more even, reduce stern degradation of energy, left pressurizing duct wall is going out to flow to hold different size settings can use stream at the more favourable application force of the surface of screw propeller generation from right pressurizing duct wall, can effectively reduce screw propeller torsion.
The version of the energy-conservation wake compensating duct of prewhirling of this fishing boat is complete, and structural strength is high, than the attached body device of existing ship energy saving, can effectively reduce vibration and noise, is conducive to fish production operation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the energy-conservation wake compensating duct of prewhirling of novel fishing boat, comprise left pressurizing duct wall (7), right pressurizing duct wall (8), central authorities welding steel (9) and six flow deflectors of prewhirling, it is characterized in that, described left pressurizing duct wall (7) and right pressurizing duct wall (8) are the little uncovered circular arc in the large rear end of front end, the radius of left pressurizing duct wall (7) is slightly less than the radius of right pressurizing duct wall (8), left, right pressurizing duct wall is integrally welded, weld with the central welding steel (9) as center shaft one end of six flow deflectors of prewhirling, the other end is welded on a left side, on the inwall of right pressurizing duct wall.
2. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, it is characterized in that, six described flow deflectors of prewhirling comprise the flow deflector of prewhirling (1), No. two flow deflectors of prewhirling (2), No. three flow deflectors of prewhirling (3), No. four flow deflectors of prewhirling (4), No. five flow deflectors of prewhirling (5) and No. six flow deflectors of prewhirling (6), the flow deflector of prewhirling (1), No. two flow deflectors of prewhirling (2) are welded on left pressurizing duct wall (7) with No. three flow deflectors of prewhirling (3), No. four flow deflectors of prewhirling (4), No. five flow deflectors of prewhirling (5) are welded on right pressurizing duct wall (8) with No. six flow deflectors of prewhirling (6).
3. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, is characterized in that, the length of conduit is L, and propeller radius is R, and L is set to 0.75～0.85R.
4. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, it is characterized in that, the front end of the pressurizing duct outer wall being made up of left pressurizing duct wall (7) and right pressurizing duct wall (8) end opening that becomes a mandarin is large, it is little that rear end goes out to flow end opening, and the bus of pressurizing duct outer wall and the angle theta of exit end face are 100 °.
5. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, it is characterized in that, left pressurizing duct wall (7) is 0.3～0.45L at the radius R 1 that goes out stream end, right pressurizing duct wall (8) is 0.45～0.55L at the radius R 2 that goes out stream end, and the center of circle of right pressurizing duct wall (8) is positioned at the just right 0.2R1 place, the center of circle of left pressurizing duct wall (7).
6. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 2, it is characterized in that, the flow deflector of prewhirling (1) is 60 ° with the angle α 1 of No. two flow deflectors of prewhirling (2), No. two flow deflectors of prewhirling (2) are 60 ° with the angle α 2 of No. three flow deflectors of prewhirling (3), No. three flow deflectors of prewhirling (3) are 60 ° with the angle α 3 of No. four flow deflectors of prewhirling (4), No. four flow deflectors of prewhirling (4) are 60 ° with the angle α 4 of No. five flow deflectors of prewhirling (5), No. five flow deflectors of prewhirling (5) are 60 ° with the angle α 5 of No. six flow deflectors of prewhirling (6), No. six flow deflectors of prewhirling (6) are 60 ° with the angle α 6 of the flow deflector of prewhirling (1), No. three flow deflectors of prewhirling (3) overlap with the line of centers of left pressurizing duct wall (7) at the end that becomes a mandarin with the edge of No. six flow deflectors of prewhirling (6).
7. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, is characterized in that, six flow deflectors of prewhirling are curved surface stainless steel materials, and carries out rounding processing going out stream end and the end margin that becomes a mandarin.
8. according to the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat described in claim 2 or 6, it is characterized in that, the flow deflector of prewhirling (1) end margin that becomes a mandarin is 3.95 ° at the angle β 1 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, No. two flow deflectors of prewhirling (2) end margin that becomes a mandarin is 3.95 ° at the angle β 2 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, No. three flow deflectors of prewhirling (3) end margin that becomes a mandarin is 3.95 ° at the angle β 3 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, No. four flow deflectors of prewhirling (4) end margin that becomes a mandarin is 3.95 ° at the angle β 4 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, No. five flow deflectors of prewhirling (5) end margin that becomes a mandarin is 3.95 ° at the angle β 5 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin, No. six flow deflectors of prewhirling (6) end margin that becomes a mandarin is 3.95 ° at the angle β 6 that goes out to flow orthogonal projection line on end face and go out to flow with it end margin.
9. the energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat according to claim 1, is characterized in that, described left pressurizing duct wall (7) is stainless steel materials with right pressurizing duct wall (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410187966.0A CN104002950B (en) | 2014-05-06 | 2014-05-06 | The energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410187966.0A CN104002950B (en) | 2014-05-06 | 2014-05-06 | The energy-conservation wake compensating duct of prewhirling of a kind of novel fishing boat |
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| CN104002950B CN104002950B (en) | 2017-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104828226A (en) * | 2015-04-21 | 2015-08-12 | 中国船舶工业集团公司第七〇八研究所 | Auxiliary propulsion energy-saving device for ship hydrodynamics |
| CN108128404A (en) * | 2017-12-11 | 2018-06-08 | 中国船舶工业集团公司第七0八研究所 | One kind is used for the pinpoint experimental rig of paddle precompensation conduit and installation method |
| CN110040231A (en) * | 2019-05-13 | 2019-07-23 | 哈尔滨工程大学 | A kind of asymmetric conduit for ship rear screw shaft |
| CN113879498A (en) * | 2021-11-10 | 2022-01-04 | 中国船舶工业集团公司第七0八研究所 | Marine spiral line type guide pipe fin |
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| CN202593838U (en) * | 2012-05-18 | 2012-12-12 | 大连船舶重工集团有限公司 | Ship hydrodynamic front guide wheel energy-saving device |
| EP2594479A1 (en) * | 2011-11-18 | 2013-05-22 | Hamilton Sundstrand Corporation | Rim driven thruster having propeller drive modules |
| EP2597030A2 (en) * | 2011-02-25 | 2013-05-29 | Becker Marine Systems GmbH & Co. KG | Pre-nozzle for a propulsion system of a water vehicle for improving energy efficiency |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7357687B1 (en) * | 2006-12-29 | 2008-04-15 | Navatek, Ltd. | Marine propulsion steering system |
| EP2597030A2 (en) * | 2011-02-25 | 2013-05-29 | Becker Marine Systems GmbH & Co. KG | Pre-nozzle for a propulsion system of a water vehicle for improving energy efficiency |
| EP2594479A1 (en) * | 2011-11-18 | 2013-05-22 | Hamilton Sundstrand Corporation | Rim driven thruster having propeller drive modules |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104828226A (en) * | 2015-04-21 | 2015-08-12 | 中国船舶工业集团公司第七〇八研究所 | Auxiliary propulsion energy-saving device for ship hydrodynamics |
| CN108128404A (en) * | 2017-12-11 | 2018-06-08 | 中国船舶工业集团公司第七0八研究所 | One kind is used for the pinpoint experimental rig of paddle precompensation conduit and installation method |
| CN108128404B (en) * | 2017-12-11 | 2019-03-22 | 中国船舶工业集团公司第七0八研究所 | One kind being used for the pinpoint experimental rig of paddle precompensation conduit and installation method |
| CN110040231A (en) * | 2019-05-13 | 2019-07-23 | 哈尔滨工程大学 | A kind of asymmetric conduit for ship rear screw shaft |
| CN113879498A (en) * | 2021-11-10 | 2022-01-04 | 中国船舶工业集团公司第七0八研究所 | Marine spiral line type guide pipe fin |
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| CN104002950B (en) | 2017-01-04 |
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