CN203888994U

CN203888994U - Novel bow

Info

Publication number: CN203888994U
Application number: CN201420201216.XU
Authority: CN
Inventors: 郑文慧; 宗智
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2014-04-23
Filing date: 2014-04-23
Publication date: 2014-10-22
Anticipated expiration: 2024-04-23

Abstract

The utility model discloses a novel bow, which is provided with a design waterline and a base line; the longitudinal length of the part of the bow below the base line is a, wherein a is more than 0.2 m; the maximum vertical distance of the part of the bow below the base line is b, wherein b is more than 0; the bow comprises an upper deck, and the length of the upper deck is smaller than the length of a designed water line; the utility model discloses increased the drainage volume of bow department, be favorable to the water drainage volume at the evenly distributed of captain direction, made whole piece design waterline thin cut, wave making resistance when being favorable to reducing the navigation.

Description

A kind of new bow

Technical field

The utility model belongs to ship design field, is specially a kind of new bow.

Background technology

In recent years, along with global warming, rough weather obviously increases, energy-saving and emission-reduction and promotion environmental protection become national governments and the closely problem of concern of people, at shipbuilding industry, also be that so the resistance that existing high speed vessel overcomes in navigation process is larger, this has been increased to the energy resource consumption of boats and ships for the demand of energy-saving and emission-reduction.

Known ground, the resistance when shape of boats and ships bow directly has influence on ship's navigation; Wherein, design load water line head end shape has considerable influence to wave making resistance, during for guarantee ship's navigation, obtains lower resistance, and design load water line head end should be very thin.Usually, for low powered, it is less that wave making resistance accounts for total drag proportion, considers the other factorses such as load carrying ability, and boats and ships head end is difficult for taper, therefore in the time that Fu Rude counts Fr < 0.16, design load water line head end is shaped as convex; In the time of 0.16 < Fr < 0.20, design load water line head end is shaped as dimpling shape or linear pattern; In the time of 0.20 < Fr < 0.22, design load water line head end is shaped as linear pattern or slightly concave; The increase of counting Fr along with Fu Rude, cause that wave making length increases, do not have no progeny and move in its higher-pressure region, reducing wave making resistance must make head end design load water line flex point move backward, therefore, for the moderate powered of 0.22 < Fr < 0.32, design load water line head end shape adopts mitigation spill more.For high speed vessel, wave making resistance has accounted for the major part of total drag, because wave making higher-pressure region has expanded in nearly ship, for reducing wave making resistance, wish that whole design load water line forebody is very thin, therefore, in the time of Fr > 0.32, design load water line head end shape adopts even dimpling shape of straight line more.

In addition, ships and light boats of the prior art navigate by water in the time of transition type state, when 0.40 < Fr < 1.00, except wave making phenomenon, also there will be obvious splash phenomena.

Summary of the invention

The utility model is for the proposition of above problem, and develops a kind of new bow.

Technological means of the present utility model is as follows:

A kind of new bow, has design load water line and baseline on described stem; The longitudinal length that described stem is positioned at the following part of baseline is a, wherein 0.2 meter of a >; The vertical distance of maximum that described stem is positioned at the following part of baseline is b, wherein b > 0;

Further, a < 0.5*L, wherein a is the described stem longitudinal length that is positioned at the following part of baseline, the longitudinal length that L is design load water line;

Further, b < 2*d, wherein b is that the vertical distance of maximum, d that described stem is positioned at the following part of baseline are the distance of described baseline to described design load water line;

Further, described stem comprises upper deck, and this upper deck length is less than length on designed waterline;

Further, described upper deck is c with described design load water line fore-and-aft distance foremost foremost, 0 < c < 0.4*L, the longitudinal length that L is design load water line;

Further, described design load water line front end has two interior recesses, and two described interior recesses are along the axis symmetry of design load water line, and in each, recess both sides are distributed with respectively two flex points;

Further, connecting the straight line of two flex points and the ultimate range of this interior recess that in each, recess both sides distribute is e, wherein 0 < e < 0.25*B, the maximum width that B is design load water line.

A kind of new bow that the utility model provides, tool has the following advantages compared with the stem of prior art:

1, on stem described in the utility model, there is design load water line and baseline; The longitudinal length that described stem is positioned at the following part of baseline is a, wherein 0.2 meter of a >; The vertical distance of maximum that described stem is positioned at the following part of baseline is b, wherein b > 0; And then increased the displacement of volume at stem place, and be conducive to displacement of volume being uniformly distributed of captain's direction, make whole piece design load water line very thin, the wave making resistance while being conducive to reduce navigation.

2, upper deck length described in the utility model is less than length on designed waterline, the part that stem is positioned at more than design load water line is from bottom to top to the shape of ship rear-inclined, be conducive to reduce the spray resistance while navigation at a high speed the splash phenomena when weakening or eliminating high speed and navigate by water.

3, the utility model shows by Numerical simulation results, and described stem resistance-reducing yield can reach 3～10%, reach ship energy saving reduce discharging object, fall resistance energy-saving effect obvious, there is good business and military use.

4, the utility model design and build process simple, be suitable for ship design field and extensively promote.

Brief description of the drawings

Fig. 1 is the center buttock figure of stem described in the utility model;

Fig. 2 is the birds-eye view of design load water line described in the utility model.

In figure: 1, stem, 2, design load water line, 3, baseline, 4, upper deck, 21, flex point, 22, interior recess.

Detailed description of the invention

A kind of new bow as depicted in figs. 1 and 2, has design load water line 2 and baseline 3 on described stem 1; The longitudinal length that described stem 1 is positioned at baseline part below 3 is a, wherein 0.2 meter of a >; The vertical distance of maximum that described stem 1 is positioned at baseline part below 3 is b, wherein b > 0; Further, a < 0.5*L, wherein a be described stem 1 be positioned at baseline below 3 part longitudinal length, L be the longitudinal length of design load water line 2; Further, b < 2*d, wherein b be described stem 1 be positioned at baseline below 3 part the vertical distance of maximum, d be the distance of described baseline 3 to described design load water line 2; Further, described stem 1 comprises upper deck 4, and these upper deck 4 length are less than design load water line 2 length; Further, described upper deck 4 is c with described design load water line 2 fore-and-aft distance foremost foremost, 0 < c < 0.4*L, and L is the longitudinal length of design load water line 2; Further, described design load water line 2 front ends have the axis symmetry of 22, two described interior recesses 22 of two interior recesses along design load water line 2, and in each, recess 22 both sides are distributed with respectively two flex points 21; Further, connecting the straight line of two flex points 21 and the ultimate range of this interior recess 22 that in each, recess 22 both sides distribute is e, wherein 0 < e < 0.25*B, and B is the maximum width of design load water line 2.

1, on stem described in the utility model, there is design load water line and baseline; The longitudinal length that described stem is positioned at the following part of baseline is a, wherein 0.2 meter of a >; The vertical distance of maximum that described stem is positioned at the following part of baseline is b, wherein b > 0; And then increased the displacement of volume at stem place, and be conducive to displacement of volume being uniformly distributed of captain's direction, make whole piece design load water line very thin, the wave making resistance while being conducive to reduce navigation; Further, described stem is positioned at the longitudinal length a < 0.5*L of the following part of baseline, and described stem is positioned at the vertical distance b < 2*d of maximum of the following part of baseline; Further, described design load water line front end has two interior recesses, two described interior recesses are along the axis symmetry of design load water line, in each, recess both sides are distributed with respectively two flex points, connecting the straight line of two flex points and the ultimate range of this interior recess that in each, recess both sides distribute is e, wherein 0 < e < 0.25*B, the maximum width that B is design load water line, and then the shape of restriction stem, ensure that design load water line is very thinner in whole stem wave making higher-pressure region.

What the utility model adopted is boats and ships technical terms, is laterally wherein the direction along ship port and starboard, is longitudinally the direction along bow tail, and vertical is vertical direction, the maximum transversal spacing that the maximum width B of design load water line is design load water line.

The above; it is only preferably detailed description of the invention of the utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; be equal to replacement or changed according to the technical solution of the utility model and inventive concept thereof, within all should being encompassed in protection domain of the present utility model.

Claims

1. A novel bow, characterized in that: the bow (1) has a design waterline (2) and a baseline (3); the bow (1) is positioned at the longitudinal length of the part below the baseline (3) is a, where a>0.2 meters; the maximum vertical distance of the part of the bow (1) below the baseline (3) is b, where b>0.

2. A novel bow according to claim 1, characterized in that a<0.5*L, where a is the longitudinal length of the bow (1) below the baseline (3), and L is the design waterline (2) The longitudinal length.

3. A novel bow according to claim 1, characterized in that b<2*d, where b is the maximum vertical distance of the bow (1) below the baseline (3), and d is the The distance from the baseline (3) to the design waterline (2).

4. A new type of bow according to claim 1, characterized in that said bow (1) includes an upper deck (4), and the length of the upper deck (4) is less than the length of the design waterline (2).

5. A new type of bow according to claim 4, characterized in that the longitudinal distance between the front end of the upper deck (4) and the front end of the design waterline (2) is c, 0<c<0.4* L, L is the longitudinal length of design waterline (2).

6. A new type of bow according to claim 1, characterized in that the front end of the design waterline (2) has two indentations (22), and the two indentations (22) are along the design waterline. The axis of the line (2) is symmetrical, and two inflection points (21) are respectively distributed on both sides of each inner recess (22).

7. A new type of bow according to claim 6, characterized in that the maximum distance between the straight line connecting the two inflection points (21) distributed on both sides of each inner recess (22) and the inner recess (22) is e, where 0<e<0.25*B, B is the maximum width of the design waterline (2).