CN202193169U

CN202193169U - Egg-shaped ship bow

Info

Publication number: CN202193169U
Application number: CN2011203007023U
Authority: CN
Inventors: 陈弘文
Original assignee: DONGGUAN JIETENG MARINE CO LTD
Current assignee: DONGGUAN JIETENG MARINE CO LTD
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-04-18
Anticipated expiration: 2021-08-18

Abstract

The utility model discloses an egg-shaped ship bow which comprises a ship hull and a bulbous bow, wherein the bulbous bow comprises a body and a blunt front edge extending forwards along the body, the longitudinal profile of the body is egg-shaped, the body is composed of an arc-shaped upper curved surface and a lower end face, the lower end face narrows down and extends downwards along the arc-shaped upper curved surface, and the end face is in a V shape. The egg-shaped ship bow is specially designed for a cruise yacht which sails slowly for a long distance; with the adoption of the egg-shaped ship bow, the wave making resistance is effectively lowered, the energy consumption is reduced, the pitch frequency is lowered when the cruise yacht sails, and the comfortableness in sailing is improved.

Description

A kind of egg shape stem

Technical field:

The utility model relates to the stem device, refers in particular to a kind ofly not only can effectively reduce wave making resistance, reduce energy consumption, and can reduce yacht navigation pitch frequency, promotes the egg shape stem of navigation comfort level.

Background technology:

Along with expanding economy; Energy-conserving and environment-protective and reduction energy cost become the vital task of ship design; And the ship shape drag reduction becomes the most important thing, and the resistance of hull is mainly derived from wave making resistance, wake resistance and viscous pressure drag etc., and wave making resistance mainly is from the stem ripple.First kind of drag reduction mode because stem is not provided with the nose bow, just made certain improvement with the front end shell of stem, though play certain drag-reduction effect, effect is little, and power consumption is high, yacht navigation pitch frequency is high; The second way has a nose bow in that the front end shell of stem is one-body molded, and the elevation profile of its nose bow is a circle; Though its drag-reduction effect is apparent in view, reduced yacht navigation pitch frequency to a certain extent, it is smooth and easy inadequately that it cuts wave; Produce the more spray; Pounce on UD upper deck, can produce corresponding resistance simultaneously, it has the bigger space of improving.

The utility model content:

The purpose of the utility model is to overcome the deficiency of prior art; The length that aims at long at a slow speed distance navigation provides a kind of apart from the yacht that cruises not only can reduce wave making resistance effectively, reduce energy consumption; And can reduce yacht navigation pitch frequency, promote the egg shape stem of navigation comfort level.

In order to solve the technical matters of above-mentioned existence, the utility model adopts following technical proposals: a kind of egg shape stem comprises a shell and a nose bow; Wherein, The nose bow comprises a main body and the blunt type leading edge that extends to form along main body left, and wherein, the longitudinal profile of main body is an egg type; Described nose bow and shell are one-body molded.

Furthermore, in the technique scheme, described main body constitutes with the lower surface that the mode that narrows down extends to form downwards by an arc top-surface camber and along the arc top-surface camber, and wherein, this lower surface is V-shaped.

Furthermore, in the technique scheme, the egg type curved surface that described blunt type leading edge is a fairing.

Furthermore, in the technique scheme, the main body in the described nose bow is tilted upward.

The utility model egg shape stem has following beneficial effect compared with prior art:

1, when the speed of a ship or plane between 7 to 12.5 joints time, the egg shape nose bow of the utility model can be made reverse bow wave, is used for offsetting the wave making resistance that original stem is produced when navigation, so can reduce the stem ripple, lowers waste of power, has improved the yacht propulsion coefficient.

2, the utility model has been optimized near the streamflow regime of ball bow, and during the incision of egg shape nose bow, because the nose bow adopts the egg shape design, its below is comparatively sharp thin, so it is smooth and easy to cut wave, can reduce the unnecessary spray, avoids shipping of green water.

When 3, the egg shape stem rose, because the design of " egg shape ", the top was comparatively roomy, and institute is so that the speed that rises is comparatively slow, thereby shell pitching (Pitching) cycle is changed steadily, reduced yacht navigation pitching, promoted to navigate by water comfort level.

Description of drawings:

Fig. 1 is the front view of the utility model;

Fig. 2 is the section-drawing of nose bow in the utility model.

Description of reference numerals:

1 nose bow, 11 main bodys, 12 blunt type leading edge 2 shells

The specific embodiment:

Below in conjunction with specific embodiment and accompanying drawing the utility model is further specified.

See also Fig. 1,2, a kind of egg shape stem comprises a shell 2 and a nose bow 1.Particularly, nose bow 1 comprises a main body 11 and the blunt type leading edge 12 that extends to form along main body 11 left, and wherein, the longitudinal profile of main body 11 is an egg type.Described main body 11 constitutes with the lower surface that the mode that narrows down extends to form downwards by an arc top-surface camber and along the arc top-surface camber, and wherein, this lower surface is V-shaped.Nose bow 1 is one-body molded with the shell 2 of boats and ships; Main body 1 in the nose bow 1 is tilted upward, and wherein, blunt type leading edge 12 is the egg type curved surface of a fairing.

More specifically, boats and ships navigate by water in water, and the nose bow 1 of stem does not have in the entry; Because nose bow 1 is the design of " egg shape ", the below is comparatively sharp thin, and its sharp thin part there is not in the entry fully; So it is smooth and easy that nose bow 1 is cut wave under sail, can reduce the unnecessary spray, avoids shipping of green water; The upper surface broad of nose bow 1, little being exposed on the water surface makes the climbing speed of stem under sail comparatively slow, thereby shell pitching (Pitching) cycle is changed steadily, reduces pitch frequency, promotes the navigation comfort level.

At Shanghai Ship & Shipping Research Institute (SSSRI; Place: No. 600, people's livelihood road, Shanghai Pudong New Area); To new design egg shape nose bow and traditional round nose bow and (the Test item numbering: JT0806203) relatively that do not have three little ship models of ball-type nose bow to make an experiment; Its pattern number is respectively S57DH-1, JT2008-1, JT2008-2.

The test Hull Number	Detailed	Test name
			The S57DH-1 model	There is not the nose bow	Resistance test/streamline test
The JT2008-1 model	The round nose bow of tradition	Resistance test/streamline test
			The JT2008-2 model	New design egg shape nose bow	Resistance test/streamline test

Through experimental observation, Shanghai Ship & Shipping Research Institute (SSSRI) draw following some:

1, when the speed of a ship or plane between 7 to 12.5 joints, it is smooth and easy that JT2008-2 ship model (having egg shape nose bow) produces bow wave, it is obvious to reduce the wave making resistance effect.JT2008-2 ship model shell Resistance Value reduces 3.3% than JT2008-1 ship model (having traditional round nose bow), but speed is when surpassing 12.5 joints, and situation is opposite.

2, when the speed of a ship or plane 7 to 12 the joint between, the shell of round nose bow is installed and does not have the shell Resistance Value of nose bow to differ about 6%.

3, when the speed of a ship or plane between 7.2 to 11.5 joints time, change egg shape nose bow shell period of pitching steadily, pitch frequency is minimum, best performance, its pitching and traditional round type ship bow are compared, lifting about 2% is compared then with the shell that does not have the nose bow and to be promoted about 5%.

Conclusion (of pressure testing): this case is long apart from cruising yacht (Long Range Trawler); Be 6 joints when it navigates by water at a slow speed, cruising speed is 9 joints, and maximum speed is 12 joints; Contrast through overtesting; New design egg shape nose bow, it reduces wave making resistance and pitch frequency is that 7 to save the interval performance of 12.5 joints fitst water at the speed of a ship or plane, is fit to very much be installed at a slow speed length apart from above the ocean-going cruiser.

Certainly; The above is merely an embodiment of the utility model; Be not to limit the utility model practical range, all equivalences of doing according to the said structure of the utility model claim, characteristic and principle change or modify, and all should be included in the utility model claim.

Claims

1. an egg shape stem comprises a shell (2) and a nose bow (1), it is characterized in that: nose bow (1) comprises a main body (11) and the blunt type leading edge (12) that extends to form forward along main body (11), and wherein, the longitudinal profile of main body (11) is an egg type; Described nose bow (1) is one-body molded with shell (2).

2. egg shape stem according to claim 1 is characterized in that: described main body (11) constitutes with the lower surface that the mode that narrows down extends to form downwards by an arc top-surface camber and along the arc top-surface camber, and wherein, this lower surface is V-shaped.

3. egg shape stem according to claim 1 is characterized in that: described blunt type leading edge (12) is the egg type curved surface of a fairing.

4. egg shape stem according to claim 1 is characterized in that: the main body (11) in the described nose bow (1) is tilted upward.