CN201437396U

CN201437396U - Bow structure of medium and large-sized trawler

Info

Publication number: CN201437396U
Application number: CN200920117546XU
Authority: CN
Inventors: 张晓君; 杨校刚; 王向前
Original assignee: Zhejiang Ocean University ZJOU
Current assignee: Zhejiang Ocean University ZJOU
Priority date: 2009-04-13
Filing date: 2009-04-13
Publication date: 2010-04-14
Anticipated expiration: 2019-04-13

Abstract

The utility model provides a bow structure of a medium and large-sized trawler. The bow structure comprises a bulbous bow (2) which has the offset parameters that: the relative protruding length is 2.6%, the relative immersion is 46%, the maximum width ratio is 12.8%, the bulb area ratio is 7.3% and the relative drain volume ratio is 0.45%. In the utility model, through the anti-drag bulb which is additionally arranged at the bow of a boat body, the boat can achieve the drag reduction of 6% under the set offset parameters, and the anti-drag effect is obtained through pool resistance test and flow simulation by adopting a reduced scale boat model. Compared with the prior art, the medium and large-sized trawler is provided with the bulbous bow not only for aesthetics but for the anti-drag requirements, and the purpose of reducing the energy consumption from the aspects of boat design of a large number of used fishing boats is achieved.

Description

Medium-and-large-sized trawlnet class fishing boat stem structure

Technical field

The utility model relates to a kind of medium-and-large-sized trawlnet class fishing boat stem structure, belong to the shape technology field of the forward of boats and ships in the transportation.

Background technology

The said medium-and-large-sized trawlnet class fishing boat of the utility model is the captain at 36～46 meters the low speed medium-and-large-sized boats and ships of ship's speed about 10 joints.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 then is the most important thing.Aspect medium-and-large-sized trawlnet class fishing boat energy-conservation,, use disclosing of clear and definite parameter, shape and the research of effect drag reduction bulbous bow and see at present mainly based on shrouded propeller, ball tail etc.Other class fishing boats that used bulbous bow also mainly are to consider the attractive in appearance of ship shape and be provided with, and concrete stochastic parameter is very big.

Because high speed ships energy consumption is huge, so the research for the boats and ships bulbous bow concentrates on the high speed ships mostly all the time, and do not relate to the low speed boats and ships, while low speed boats and ships and the high-speed ship difference on stream power effect, the dependency structure parameter that can not divert from one use to another high-speed ship simply.

Summary of the invention

At above-mentioned deficiency, the utility model will provide a kind of medium-and-large-sized trawlnet class fishing boat stem structure exactly, to fill up such boats and ships in the structural blank of stem.

The medium-and-large-sized trawlnet class fishing boat stem structure that the utility model provides, bulbous bow is arranged, and its offset parameter is: give prominence to length=2.6%, relative depth of immersion=46%, maximum width ratio=12.8%, the long-pending ratio=7.3% of ball nasal surface, relative displacement of volume ratio=0.45% relatively.Said outstanding relatively length is that bulbous bow is foremost to the ratio of distance with the bow stern center-to-center distance of stem; Said relative depth of immersion is the ratio of draft with the draft of whole ship of ball nose front end when the designed draft degree of depth; Said maximum width is than being ball nose bench section, stem place maximum width and the ratio of the maximum width of ship; Said ball nasal surface is long-pending than being stem place ball nose area of section and the ratio of ship midship section area; Said relative displacement of volume is than being the displacement of volume that increases of bulbous bow and the ratio of the total displacement of volume of hull.

The medium-and-large-sized trawlnet class fishing boat stem structure that the utility model provides, add drag reduction ball nose at the hull bow, and the offset parameter that sets can make boats and ships reach drag reduction 6%, and alleged drag-reduction effect is to adopt the reduced scale ship model to carry out pond resistance test and the acquisition of fluid simulation calculation.Compared with prior art, the utility model is not only for attractive in appearance and bulbous bow is set, but requires medium-and-large-sized trawlnet class fishing boat is provided with bulbous bow at drag reduction, can make the fishing boat of extensive application reach the purpose that cuts down the consumption of energy from the ship shape design aspect.

Description of drawings

Fig. 1 is the profile view of the utility model one embodiment, among the figure: 1-hull, 2-bulbous bow, A-sternpost line, BL-hull bottom line, F-stem line, M-bulbous bow front end, WL-designed draft line;

Fig. 2 is the drag coefficient curve comparison diagram of the utility model and prior art, among the figure: a-the utility model model resistance coefficient curve, b-prior art model resistance coefficient curve, C _Tm-coordinate the longitudinal axis, expression RRF, Fr-coordinate transverse axis, your moral number of expression Fu;

Fig. 3 is the effective power curve comparison diagram of the utility model and prior art, among the figure: c-the utility model model effective power curve, d-prior art model effective power curve, Fr-coordinate transverse axis, your moral number of expression Fu, P-ordinate, expression power, unit is kilowatt.

The specific embodiment

This example is the stem structure of a 6.40m molded breadth steel stern trawler, and the lateral plan of its whole ship as shown in Figure 1.This ship length overall 41m, length on water line, promptly distance between designed draft line WL place height hull front and back end is 36.81m, between sternpost line A and stem line F apart from 33.6m, molded breadth 6.4m, moldeed depth 3.2m, designed draft are vertical dimension 2.5m between designed draft line and hull bottom line BL, bulbous bow front end M is to long 0.8788m between the stem line, vertical dimension 1.15m between ball nose front end and hull bottom line BL, the bulbous bow maximum width 0.8192m of stem line place, the ball nose area of section 0.547m of stem line place ², ship midship section area 7.49m ², the displacement of volume 1.58m that bulbous bow increased ³, the total displacement of volume 352.36m of hull ³

It is about 6% to prove that through model test and fluid emulation ship type that this type ship has a bulbous bow reduces than the profile drag of no bulbous bow, test the gained drag coefficient to curve ratio figure and effective power curve comparison diagram respectively shown in Fig. 2,3.

Claims

1. medium-and-large-sized trawlnet class fishing boat stem structure, it is characterized in that bulbous bow is arranged, and its offset parameter is: give prominence to length=2.6%, relative depth of immersion=46%, maximum width ratio=12.8%, the long-pending ratio=7.3% of ball nasal surface, relative displacement of volume ratio=0.45% relatively; Wherein: said outstanding relatively length is that bulbous bow is foremost to the ratio of distance with the bow stern center-to-center distance of stem; Said relative depth of immersion is the ratio of draft with the draft of whole ship of ball nose front end when the designed draft degree of depth; Said maximum width is than being ball nose bench section, stem place maximum width and the ratio of the maximum width of ship; Said ball nasal surface is long-pending than being stem place ball nose area of section and the ratio of ship midship section area; Said relative displacement of volume is than being the displacement of volume that increases of bulbous bow and the ratio of the total displacement of volume of hull.