CN205675182U

CN205675182U - A kind of ship stern structure of inward turning r Zweier oceangoing ship

Info

Publication number: CN205675182U
Application number: CN201620007831.6U
Authority: CN
Inventors: 张敏健; 孙家鹏; 魏菲菲
Original assignee: Shanghai Merchant Ship Design and Research Institute
Current assignee: Shanghai Merchant Ship Design and Research Institute
Priority date: 2016-01-05
Filing date: 2016-01-05
Publication date: 2016-11-09
Anticipated expiration: 2026-01-05

Abstract

This utility model relates to the ship stern structure of a kind of inward turning r Zweier oceangoing ship, including little a pair double tail fins, from top view, has the level inclination to hull axis from front to back, and a pair support shaft in little tail fin also tilts same angle.The direction in intilted little tail fin and ship stern flow field is complied with mutually, decreases afterbody current and separates, thus reduces resistance.It addition, the result having an effect with the oppositely oriented preswirl of oar and oar makes wake flow rotary weakening or elimination after oar, reach to reduce the loss of wake energy, improve the effect of propulsive efficiency.This utility model effectively improves afterbody flow field, reduces propeller exciting force, is reduced under 1.5kPa by the propeller single order exciting force under designed draft, improves boats and ships comfortableness；Structure is relatively easy, does not increase or changes afterbody attached body structure and size, beneficially optimal enforcement；Economy and rapidity are done and has well taken into account.

Description

A kind of ship stern structure of inward turning r Zweier oceangoing ship

Technical field

This utility model relates to the ship stern structure of a kind of boats and ships, specifically, is the ship stern knot of a kind of inward turning r Zweier oceangoing ship Structure, belongs to ship stern structure-design technique field.

Background technology

Passenger boat (including ro-ro passenger ship, passenger-cargo vessel) returns safely due to restriction, the demand of maneuverability and the international norm of drinking water The needs at port, the most all use double oar.Propeller inward turning is high relative to outward turning efficiency, therefore without cause specific, all adopts By the form of inward turning.

The big tail fin line style corresponding with double oars can cause propeller-excited vibration to cause ship hull vibration, the most not in use by.When Front popular afterbody pattern is without tail fin+twin shaft support or little tail fin+single-shaft support.Former structure is relatively easy, at height Apply more in speed and the relatively small r Zweier of loading capacity；The latter has taken into account rapidity and economy, and gear-box is arranged in little In tail fin so that main frame compares rearward, shortens cabin length, adding cargo hold length, application is the most universal at present.

For the little this style of line style of tail fin+single-shaft support, reducing resistance, raising efficiency, improving the uniform of wake The aspects such as property the most all also exist bottleneck, it is difficult to have big breakthrough.Its main cause is:

1) the attached body of afterbody is many, optimizes difficulty high；

2) there is the restriction of such as " axis can not make horizontal tilt " this mindset；

3) large-scale r Zweier (predominantly ro-ro passenger ship) speed of a ship or plane of domestic current navigation is relatively low, generally at below 20kn, puts into Great effort, that financial resources optimization obtains effect is limited, therefore there is the problem being short of power.

Utility model content

This utility model technical issues that need to address are: the ship stern structure of existing inward turning r Zweier oceangoing ship, are reducing resistance Power, the efficiency that improves, all there is ample room for improvement, simultaneously because the attached body of afterbody is relatively at present to improve the aspect such as uniformity of wake Many, optimization is got up relatively difficult.

This utility model takes techniques below scheme:

The ship stern structure of a kind of inward turning r Zweier oceangoing ship, including little a pair tail fin of the double oar of described inward turning, has from front to back To the level inclination of hull axis, the direction in the incline direction of little tail fin and ship stern flow field is complied with mutually, reduces afterbody current and separates, Thus reduce resistance.

This utility model, by theoretical knowledge and the simulation of a large amount of CFD, finds that hull afterbody flow field grain direction is usually The most inwardly, therefore if able to make little caudal-fin models comply with grain direction, i.e. it is in tilted layout, then can reach good Reduce afterbody current to separate, thus reduce the effect of resistance.From improving from the standpoint of propulsive efficiency, oppositely oriented pre-with oar The result that eddy flow and oar are had an effect makes wake flow rotary weakening or elimination after oar, such that it is able to reduce the loss of wake energy.Real In the simulation of border, ship stern has an outside little preswirl just in opposite direction with inward turning oar, thus reduces afterbody energy loss so that Propeller can reclaim more energy.Therefore the design proposing the little tail fin of horizontal tilt of this utility model innovation, and lead to Cross ship model experiment repeatedly and demonstrate its reliability.

Further, described little tail fin size encases oar axle just, and support shaft rear end is by single bracing strut with hull even Connect.

Further, the angle of inclination of described level inclination is 2.5 °.

Further, between the hull main frame and the described hull axis that are connected with propeller support shaft, also there is described water Flat inclination angle.

Further, little tail fin length is equal or close to the 2/3 of axle system overall length.

The beneficial effects of the utility model are:

1) being effectively improved afterbody flow field quality, under designed draft operating mode, the exciting force of propeller reduces 50%.

2) become thin in little tail fin rear end very much, and size encases oar axle just, reduces resistance；Front end geometry takes into account consideration main frame The layout of gear-box so that main frame can a certain degree of rearward, decrease the length in cabin, improve economy.

3) make the direction of propeller comply with mutually with the direction in ship stern flow field, reduce afterbody current and separate, thus reduce resistance, Solve the problem that hull is short of power to a certain extent.

4) simple in construction, does not increase or changes afterbody attached body structure and size, beneficially optimal enforcement.

5) the little tail fin pattern proposing a kind of horizontal tilt of novelty, coordinates with it, the horizontal tilt the most therewith of oar axle, Improve stern wake, be effectively increased propulsive efficiency.

6) reduce propeller exciting force, the propeller single order exciting force under designed draft is reduced to 1.5kPa it Under, improve boats and ships comfortableness.

7) done in economy and rapidity and well taken into account.

8) intilted little tail fin is complied with mutually with the direction in ship stern flow field, decreases afterbody current and separates, thus reduces Resistance.It addition, the result having an effect with the oppositely oriented preswirl of oar and oar makes wake flow rotary weakening or elimination after oar, Reach to reduce the loss of wake energy, improve the effect of propulsive efficiency.

9) this utility model effectively improves afterbody flow field, reduces propeller exciting force, by the spiral shell under designed draft Rotation oar single order exciting force is reduced under 1.5kPa, improves boats and ships comfortableness；Structure is relatively easy, does not increase or changes Afterbody attached body structure and size, beneficially optimal enforcement；Economy and rapidity are done and has well taken into account.

Accompanying drawing explanation

Fig. 1 is the front view of the ship stern structure of this utility model inward turning r Zweier oceangoing ship.

Fig. 2 is the top view of the ship stern structure of this utility model inward turning r Zweier oceangoing ship.

Fig. 3 is the partial enlarged drawing in Fig. 2.

Fig. 4 is another partial enlarged drawing in Fig. 2.

Detailed description of the invention

With specific embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.

See Fig. 1-Fig. 4, the ship stern structure of a kind of inward turning r Zweier oceangoing ship, including little a pair tail fin of the double oar of described inward turning, Having the level inclination to hull axis from front to back, the direction in the incline direction of little tail fin and ship stern flow field is complied with mutually, reduces Afterbody current separate, thus reduce resistance.

Seeing Fig. 1, the support shaft rear end at little tail fin rear portion is connected with hull by single bracing strut.In main hull line style Little tail fin is drawn on fairing ground, and rear end size encases oar axle just, and front end geometry takes into account the layout considering gear-box；Little tail fin length It is about the 2/3 of axle system overall length.

Seeing Fig. 2-Fig. 3, little tail fin slopes inwardly, and oar axle is positioned in the middle of little tail fin and tilts therewith, oar axle with along captain Horizontal sextant angle be 2.5 degree.

See Fig. 2, between the hull main frame and the described hull axis that are connected with described propeller support shaft, also there is institute State level inclination.

Between the little tail fin in left and right, arrange the narrowest shunting heel, thus reduce the flow field interference between double oar.

This utility model relates to the ship stern structure of a kind of inward turning r Zweier oceangoing ship, including little a pair double tail fins, from top view Seeing have the level inclination to hull axis from front to back, a pair support shaft in little tail fin also tilts same angle.Inwardly The little tail fin of inclination is complied with mutually with the direction in ship stern flow field, decreases afterbody current and separates, thus reduces resistance.It addition, with The result that oppositely oriented preswirl and the oar of oar is had an effect makes wake flow rotary weakening or elimination after oar, has reached reduction wake flow The loss of energy, the effect of raising propulsive efficiency.This utility model effectively improves afterbody flow field, reduces propeller-excited vibration Power, is reduced under 1.5kPa by the propeller single order exciting force under designed draft, improves boats and ships comfortableness；Structure is relative Simply, do not increase or change afterbody attached body structure and size, beneficially optimal enforcement；Economy and rapidity are done very well Take into account.

Claims

1. the ship stern structure of an inward turning r Zweier oceangoing ship, it is characterised in that:

Including little a pair tail fin of the double oar of described inward turning, there is the level inclination to hull axis, inclining of little tail fin from front to back The direction in tilted direction and ship stern flow field is complied with mutually, reduces afterbody current and separates, thus reduces resistance；

Described little tail fin size encases oar axle just, and support shaft rear end is connected with hull by single bracing strut.

2. the ship stern structure of inward turning r Zweier oceangoing ship as claimed in claim 1, it is characterised in that: the inclination angle of described level inclination Degree is 2.5 °.

3. the ship stern structure of inward turning r Zweier oceangoing ship as claimed in claim 1, it is characterised in that: it is connected with propeller support shaft Hull main frame and described hull axis between also there is described level inclination.

4. the ship stern structure of inward turning r Zweier oceangoing ship as claimed in claim 2, it is characterised in that: little tail fin length is equal or close to The 2/3 of axle system overall length.