CN103770919A - Prerotation fan-shaped conduit for right-handed single-screw ship - Google Patents
Prerotation fan-shaped conduit for right-handed single-screw ship Download PDFInfo
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- CN103770919A CN103770919A CN201410032595.9A CN201410032595A CN103770919A CN 103770919 A CN103770919 A CN 103770919A CN 201410032595 A CN201410032595 A CN 201410032595A CN 103770919 A CN103770919 A CN 103770919A
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Abstract
The invention discloses a prerotation fan-shaped conduit for a right-handed single-screw ship. The prerotation fan-shaped conduit comprises a first vane, a second vane, a third vane, a fourth vane and an arc guide plate; from the rear side of a screw propeller, the left side of a longitudinal central line of a screw impeller hub is sequentially provided with the second vane and the first vane from top to bottom, the right side is sequentially provided with the third vane and the fourth vane from top to bottom, an angle formed between the first vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees, an angle formed between the second vane and the longitudinal central line of the screw impeller hub is 25 to 30 degrees, an angle formed between the third vane and the longitudinal central line of the screw impeller hub is 35 to 45 degrees, and an angle formed between the fourth vane and the longitudinal central line of the screw impeller hub is 70 to 80 degrees. Compared with the three-vane prerotation triangular conduit, the third vane plays a role in supporting and reinforcing the prerotation and is also arranged outside an air bubble sensitive area, and the adverse impact on the air bubble performance can be avoided.
Description
Technical field
The present invention relates to the hull energy-saving equipment technology of dextrorotation single-blade ship, more particularly, relate to a kind of fan-shaped conduit of prewhirling for dextrorotation single-blade ship.
Background technology
In the use procedure of dextrorotation single-blade ship, thereby research both domestic and external has been recognized the propulsion coefficient that can improve screw propeller by changing screw propeller influent stream direction and has been reached energy-conservation effect.Prewhirl fin, the fin of prewhirling of the energy saver adopting at present adds full conduit and Mewis Duct etc., but existing apparatus exists the problems such as the low and wake of propeller propulsion coefficient is even not.Through improvement, although adopt the triangle conduit of prewhirling of 3 leaves, but still the problem of the aspect such as intensity, fatigue and vibration existing.
Summary of the invention
For the defect existing in prior art, the object of this invention is to provide a kind of fan-shaped conduit of prewhirling for dextrorotation single-blade ship, not only reduce the energy because of spin loss in propeller wake field, improve propeller propulsive efficiency, but also even wake makes screw propeller work more steady, reduce propeller exciting force, reduce ship vibration risk, make attached body structure firm, easily overcome the problem such as intensity, Fatigue Vibration.
For achieving the above object, the present invention adopts following technical scheme:
For the fan-shaped conduit of prewhirling of dextrorotation single-blade ship, be located between the screw propeller and hull of stern,
Formed by first to fourth leaf and arc-shaped guide plate; From screw propeller rear side, propeller hub longitudinal centerline left side is provided with the second leaf and the first leaf from top to bottom successively, right side is provided with the 3rd leaf and the 4th leaf from top to bottom successively, described the first leaf, the second leaf, the 3rd leaf and the 4th leaf equal in length; The blade root of described the first leaf, the blade root of the second leaf, the blade root of the 3rd leaf and the blade root of the 4th leaf are fixedly connected with screw propeller axle sleeve outside respectively; The blade back of arc-shaped guide plate is fixedly connected with the blade tip of the first leaf, blade tip, the blade tip of the 3rd leaf and the blade tip of the 4th leaf of the second leaf respectively;
Section, the 4th section of leaf and the section of guide plate of the section of described the first leaf, the section of the second leaf, the 3rd leaf are airfoil type section;
Guide margin, the 4th guide margin of leaf and the guide margin of arc-shaped guide plate of the guide margin of described the first leaf, the guide margin of the second leaf, the 3rd leaf are all relative with hull side; Lagging edge, the 4th lagging edge of leaf and the lagging edge of guide plate of the lagging edge of the first leaf, the lagging edge of the second leaf, the 3rd leaf are all relative with screw propeller side;
Down, blade back upward on the blade face of described the first leaf;
Upward, blade back down on the blade face of described the 4th leaf;
The blade face of described the second leaf is relative with the blade back of the first leaf;
The blade back of described the 3rd leaf is relative with the blade face of the 4th leaf;
The angular range of described the first leaf and propeller hub longitudinal centerline is 70 °-80 °, the angular range of described the second leaf and propeller hub longitudinal centerline is 25 °-30 °, the angular range of described the 3rd leaf and propeller hub longitudinal centerline is 35 °-45 °, and the angular range of described the 4th leaf and propeller hub longitudinal centerline is 70 °-80 °.
Direction from blade root toward blade tip, the blade face of described the first leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the first leaf puts at prop shaft and screw propeller axle sleeve forms angle, and the scope of this angle is 12 °-17 °;
Direction from blade root toward blade tip, the blade face of described the second leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the second leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 10 °-15 °;
Direction from blade root toward blade tip, the blade face of described the 3rd leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the 3rd leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 10 °-15 °;
Direction from blade root toward blade tip, the blade face of described the 4th leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the 4th leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 14 °-18 °.
The Thickness Ratio of described the first leaf, the Thickness Ratio of the second leaf, the Thickness Ratio of the 3rd leaf and the Thickness Ratio of the 4th leaf are equal, and the scope of described Thickness Ratio is 7-9.
The Thickness Ratio of described arc-shaped guide plate is 7.
The length of described the 4th leaf is the 90%-105% of propeller radius.
Compared with prior art, adopt a kind of fan-shaped conduit of prewhirling for dextrorotation single-blade ship of the present invention to there is following technique effect:
The present invention is compared with the existing fin of prewhirling: one, and more firm in structure, easily overcome the problem such as intensity, Fatigue Vibration; Its two, under square one, can used thickness than less section, additional resistance is less, the better effects if of prewhirling; Its three, increased the valve action of top catheter segment, beneficial to increasing the incoming flow of propeller disk, be beneficial to and reach better energy-saving effect.Compared with adding full conduit with the fin of prewhirling, avoided the fearless interference to good influent stream field, bottom, reduced the wetted surface area of energy-conservation attached body, because present hull form has all passed through abundant optimization, there is not obvious defect in wake.Compared with Mewis Duct, the triangle conduit of prewhirling of the present invention is concentric with propeller axis, is conducive to processing and location.Compared with the triangle conduit of prewhirling (three leaves), more robust structure, pre-swirl effect more uniformly, the 3rd blade plays when supporting and strengthen prewhirling effect, outside cavity sensitivity volume, can not cause negative effect to cavity performance; And four leaves have better support (with respect to three leaves) to curved catheter, while adopting four leaves, can also reduce the Thickness Ratio of leaf.
In a word, the present invention relates to a kind of employing prewhirls principle before oar and accelerates screw propeller top influent stream, make propeller disk influent stream hull energy-saving equipment more uniformly, focus on reducing the energy that propeller wake field is lost because of rotation, improve propeller propulsive efficiency and reduce because of the additional form resistance of afterbody flow separation.Known by experiment, 4 leaves and 3 leaf energy-saving effect difference are little, but adopt the better effects if of four leaves at aspects such as intensity, fatigue and vibrations.
Accompanying drawing explanation
Fig. 1 is the scheme of installation that the present invention is arranged on the stern of hull;
Fig. 2 is from A to the structural representation of seeing the fan-shaped conduit of prewhirling for dextrorotation single-blade ship of the present invention in Fig. 1;
Fig. 3 is the generalized section of leaf of the present invention and conduit;
Fig. 4 is the airfoil type section definition schematic diagram of four leaves of the present invention and curved catheter.
The specific embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
The feature such as hull wake feature and screw propeller hand of rotation that calculate according to CFD or model experiment is measured, invent a kind of front triangle conduit of prewhirling of asymmetric arrangement completely of oar that is loaded on middle low powered stern, to improve propulsion coefficient, evenly wake, reduces ship vibration risk.
A kind of fan-shaped conduit of prewhirling for dextrorotation single-blade ship as shown in Figure 1 and Figure 2, be located between the screw propeller 20 and hull 21 of stern, from screw propeller 20 rear sides, the stern in propeller hub longitudinal centerline left side is provided with the second leaf 12, the first leaf 11 from top to bottom, the stern on propeller hub longitudinal centerline right side is provided with the equal in length of the 3rd leaf 13, the 4th leaf 14, the first leaves 11, the second leaf 12, the 3rd leaf 13 and the 4th leaf 14 from top to bottom; The blade root of the first leaf 11, the blade root of the second leaf 12, the blade root of the 3rd leaf 13 and the blade root of the 4th leaf 14 are fixedly connected with screw propeller axle sleeve 22 outsides respectively; The blade back of arc-shaped guide plate 14 is fixedly connected with the blade tip of the first leaf 11, blade tip, the blade tip of the 3rd leaf 13 and the blade tip of the 4th leaf 14 of the second leaf 12 respectively;
Section, the 4th section of leaf and the section of guide plate of the section of the first leaf, the section of the second leaf, the 3rd leaf are airfoil type section;
Guide margin, the 4th guide margin of leaf and the guide margin of arc-shaped guide plate of the guide margin of the first leaf, the guide margin of the second leaf, the 3rd leaf are all relative with hull side; Lagging edge, the 4th lagging edge of leaf and the lagging edge of guide plate of the lagging edge of the first leaf, the lagging edge of the second leaf, the 3rd leaf are all relative with screw propeller side;
Down, blade back upward on the blade face of the first leaf;
Upward, blade back down on the blade face of the 4th leaf;
The blade face of the second leaf is relative with the blade back of the first leaf;
The blade back of the 3rd leaf is relative with the blade face of the 4th leaf;
Wherein, included angle B 1 scope of the first leaf and propeller hub longitudinal centerline is 70 °-80 ° (in Fig. 1, adopt preferably angle 72 °), included angle B 2 scopes of the second leaf and propeller hub longitudinal centerline are 25 °-30 ° (in Fig. 1, adopt preferably angle 28 °), included angle B 3 scopes of the 3rd leaf and propeller hub longitudinal centerline are 35 °-45 ° (in Fig. 1, adopt preferably angle 42 °), included angle B 4 scopes of the 4th leaf and propeller hub longitudinal centerline are 70 °-80 ° (in Fig. 1, adopt preferably angle 72 °), can accelerate like this screw propeller top influent stream, make propeller disk influent stream more even, improve propeller propulsive efficiency.
Direction from blade root toward blade tip, the angle a1 of the axis of the projection that the blade face of described the first leaf puts at prop shaft and screw propeller axle sleeve is that the blade face of the first leaf is along 12 °-17 ° of axis left-hand revolutions (adopt in Fig. 1 preferably angle 17 °), the angle a2 of the axis of the projection that the blade face of described the second leaf puts at prop shaft and screw propeller axle sleeve is that the blade face of the second leaf is along 10 °-15 ° of axis left-hand revolutions (adopt in Fig. 1 preferably angle 15 °), the angle a3 of the axis of the projection that the blade face of described the 3rd leaf puts at prop shaft and screw propeller axle sleeve is that the page of the 3rd leaf is along 10 °-15 ° of axis left-hand revolutions (adopt in Fig. 1 preferably angle 15 °), the angle a3 of the axis of the projection that the blade face of described the 4th leaf puts at prop shaft and screw propeller axle sleeve is that the page of the 4th leaf is along 14 °-18 ° of axis left-hand revolutions (adopt in Fig. 1 preferably angle 18 °), adopt the principle of prewhirling before oar, focus on reducing the energy that propeller wake field is lost because of rotation, improve propeller propulsive efficiency.
Shown in Figure 3 again, the Thickness Ratio of the first leaf 11, the Thickness Ratio of the second leaf 12, the Thickness Ratio of the 3rd leaf 13 and the Thickness Ratio of the 4th leaf 14 are equal, and the scope of Thickness Ratio is between 7-9, and the Thickness Ratio of arc-shaped guide plate 15 is 7.It should be noted that, meet structural strength require in the situation that, Thickness Ratio is the smaller the better, can reduce friction drag, above fixed Thickness Ratio be obtaining of calculating by finite element software.
The present invention is made up of leaf and the arc-shaped guide plate of 4 complete asymmetric arrangement, and the section shape of leaf and the section shape of guide plate are chosen the little series of the wing middle drag by lift of NACA, and its intensity need to be adjusted according to leaf and the suffered live load of guide plate.The layout of fan-shaped conduit of prewhirling is shown in Fig. 1, and its basic arrangement principle is for conventional 2 leaves in dextrorotation single-blade ship left side, 2, right side leaf.
According to our research, the length of leaf also will be in certain scope the good energy-saving effect of guarantee, the outer top end of leaf will be in the scope of 90%R-105%R, wherein R is propeller radius.
This equipment is installed on the hull before screw propeller, produces the pre-rotation flow field before oar, thereby reach minimizing degradation of energy by changing flow field direction, improves the object of propeller propulsive efficiency.Carry out detailed leaf layout and anglec of rotation optimization for ship stern flow fields feature after, can reach considerable energy-saving effect.Meanwhile, determine leaf and the supravasal live load of triangle in conjunction with the hydrodynamic load of afterbody and ship motion, and then check intensity.
For example: the fan-shaped conduit application CFD software of prewhirling of the present invention carries out, after leaf layout and angle optimization, being installed on 38800dwt bulge carrier, carries out model experiment, forecast result: at 14 joints, reduce consumption of power 2% at HSVA.
It should be noted that, the section of described four leaves and arc-shaped guide plate is airfoil type section, as shown in Figure 4, wherein, 81 is the lagging edges that guide margins, 84 that the blade face, 82 of airfoil type section is airfoil type section for the blade back of airfoil type section, 83 are airfoil type section in the definition of airfoil type section.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for object of the present invention is described, and not as limitation of the invention, as long as in essential scope of the present invention, variation, modification to the above embodiment all will drop in the scope of claim of the present invention.
Claims (5)
1. for the fan-shaped conduit of prewhirling of dextrorotation single-blade ship, be located between the screw propeller and hull of stern, it is characterized in that:
Formed by first to fourth leaf and arc-shaped guide plate; From screw propeller rear side, propeller hub longitudinal centerline left side is provided with the second leaf and the first leaf from top to bottom successively, right side is provided with the 3rd leaf and the 4th leaf from top to bottom successively, described the first leaf, the second leaf, the 3rd leaf and the 4th leaf equal in length; The blade root of described the first leaf, the blade root of the second leaf, the blade root of the 3rd leaf and the blade root of the 4th leaf are fixedly connected with screw propeller axle sleeve outside respectively; The blade back of arc-shaped guide plate is fixedly connected with the blade tip of the first leaf, blade tip, the blade tip of the 3rd leaf and the blade tip of the 4th leaf of the second leaf respectively;
Section, the 4th section of leaf and the section of guide plate of the section of described the first leaf, the section of the second leaf, the 3rd leaf are airfoil type section;
Guide margin, the 4th guide margin of leaf and the guide margin of arc-shaped guide plate of the guide margin of described the first leaf, the guide margin of the second leaf, the 3rd leaf are all relative with hull side; Lagging edge, the 4th lagging edge of leaf and the lagging edge of guide plate of the lagging edge of the first leaf, the lagging edge of the second leaf, the 3rd leaf are all relative with screw propeller side;
Down, blade back upward on the blade face of described the first leaf;
Upward, blade back down on the blade face of described the 4th leaf;
The blade face of described the second leaf is relative with the blade back of the first leaf;
The blade back of described the 3rd leaf is relative with the blade face of the 4th leaf;
The angular range of described the first leaf and propeller hub longitudinal centerline is 70 °-80 °, the angular range of described the second leaf and propeller hub longitudinal centerline is 25 °-30 °, the angular range of described the 3rd leaf and propeller hub longitudinal centerline is 35 °-45 °, and the angular range of described the 4th leaf and propeller hub longitudinal centerline is 70 °-80 °.
2. the fan-shaped conduit of prewhirling according to claim 1, is characterized in that:
Direction from blade root toward blade tip, the blade face of described the first leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the first leaf puts at prop shaft and screw propeller axle sleeve forms angle, and the scope of this angle is 12 °-17 °;
Direction from blade root toward blade tip, the blade face of described the second leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the second leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 10 °-15 °;
Direction from blade root toward blade tip, the blade face of described the 3rd leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the 3rd leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 10 °-15 °;
Direction from blade root toward blade tip, the blade face of described the 4th leaf is along its axis left-hand revolution, and the axis of the projection that the blade face of described the 4th leaf puts at prop shaft and screw propeller axle sleeve forms angle, and this angular range is 14 °-18 °.
3. the fan-shaped conduit of prewhirling according to claim 1, is characterized in that:
The Thickness Ratio of described the first leaf, the Thickness Ratio of the second leaf, the Thickness Ratio of the 3rd leaf and the Thickness Ratio of the 4th leaf are equal, and the scope of described Thickness Ratio is 7-9.
4. the fan-shaped conduit of prewhirling according to claim 1, is characterized in that:
The Thickness Ratio of described arc-shaped guide plate is 7.
5. the fan-shaped conduit of prewhirling according to claim 1, is characterized in that:
The length of described the 4th leaf is the 90%-105% of propeller radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032595.9A CN103770919A (en) | 2014-01-23 | 2014-01-23 | Prerotation fan-shaped conduit for right-handed single-screw ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032595.9A CN103770919A (en) | 2014-01-23 | 2014-01-23 | Prerotation fan-shaped conduit for right-handed single-screw ship |
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| CN103770919A true CN103770919A (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410032595.9A Pending CN103770919A (en) | 2014-01-23 | 2014-01-23 | Prerotation fan-shaped conduit for right-handed single-screw ship |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104608895A (en) * | 2014-12-22 | 2015-05-13 | 中国船舶重工集团公司第七○二研究所 | Ship stern flow energy recovery device in sector structural style |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB207167A (en) * | 1922-11-18 | 1924-06-12 | Walther Kucharski | Improvements in and connected with guide devices for screw propellers |
| CN102381463A (en) * | 2011-08-17 | 2012-03-21 | 上海船舶研究设计院 | Reaction fin in front of propeller |
| 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 |
| 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 |
| CN203902828U (en) * | 2014-01-23 | 2014-10-29 | 上海船舶研究设计院 | Prerotation fan-shaped guide pipe for rightward rotation single-propeller boat |
-
2014
- 2014-01-23 CN CN201410032595.9A patent/CN103770919A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB207167A (en) * | 1922-11-18 | 1924-06-12 | Walther Kucharski | Improvements in and connected with guide devices for screw propellers |
| CN102381463A (en) * | 2011-08-17 | 2012-03-21 | 上海船舶研究设计院 | Reaction fin in front of propeller |
| 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 |
| 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 |
| CN203902828U (en) * | 2014-01-23 | 2014-10-29 | 上海船舶研究设计院 | Prerotation fan-shaped guide pipe for rightward rotation single-propeller boat |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104608895A (en) * | 2014-12-22 | 2015-05-13 | 中国船舶重工集团公司第七○二研究所 | Ship stern flow energy recovery device in sector structural style |
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Application publication date: 20140507 |
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