CN201520396U

CN201520396U - Transition-level air bubble vehicle

Info

Publication number: CN201520396U
Application number: CN2009202282971U
Authority: CN
Inventors: 陈克强; 王家楣; 熊鳌魁; 胡晓明
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2009-09-22
Filing date: 2009-09-22
Publication date: 2010-07-07
Anticipated expiration: 2019-09-22

Abstract

Disclosed is a transition-level air bubble vehicle. A shallow fault for spraying air is arranged on the bottom of the vehicle, and an air chamber is arranged inside the wall of the shallow fault. A sharp bilge pressed downwards is arranged on a bilge portion, and a downwards pressed angle ranges from 20 degrees to 60 degrees. The height of the shallow fault is 0.05-0.5 times of the thickness of a boundary layer in the locality, and a longitudinal position of the shallow fault distances a forward perpendicular by 30-40% Lbp. Simultaneously, length-width ratio and slender degree coefficient of an original transition-level vehicle keep unchanged, and wave making resistance characteristics and other property characteristics of the original transition-level vehicle also keep unchanged. The transition-level air bubble vehicle has fine low wave making resistance property and sea keeping performance, controls air bubbles within the boundary layer, leads longitudinal movement of the air bubbles to have fine property, prevents the air bubbles from being easy to escape, has air bubble resistance reduction rate over 15%, and is adaptable to high-speed water ships.

Description

Transstage bubble drag-reduction ship

Technical field

The utility model relates to a kind of marine vehicle, particularly relates to a kind of bubble drag-reduction ship.

Background technology

Bubble drag-reduction, air layers reducing resistance and microbubble drag reduction all are to utilize bubble or air film to change density of medium on the ships and light boats surface and change boundary layer structure to reduce friction drag.Because bubble or air film laws of motion, the easiest realization high efficiency bubble drag-reduction be flat boats and ships, therefore, study bubble drag-reduction both at home and abroad all from having big flat bottomed glider, all obtained higher drag-reduction effect.

Because ships and light boats relative velocity difference is many-sided (except that rapidity, also will consider rough water quality, stability, road-holding property etc.) to performance demands, therefore, different to the yardstick and the requirement of ship type feature line style of ships and light boats, most of high speed vessel all is in transstage ship category.

Since transstage ship ship type to be characterized as aspect ratio bigger, hull is elongated, bubble is longer in the longitudinal movement distance, bubble concentration is kept vertically being difficult for; This external cause is taken characteristic on wave into account, and there is horizontal oblique ascension in the bottom at the bottom of the ship, and bubble is difficult for keeping, and has horizontal escape phenomenon.The feature that the transstage ship is had to bubble motion and keep unfavorable, thereby is carried out bubble drag-reduction research at the transstage ship both at home and abroad and is not appeared in the newspapers as yet.

Summary of the invention

Technical problem to be solved in the utility model is: provide the when slender degree coefficient of a kind of length and width with conventional transition level ship identical, do not change original wave resistance of boat characteristic and other performance characteristics, the lengthwise position of reasonable Arrangement bubble generator also guarantees that with shallow disconnected level form bubble goes out stream and resistance performance, lift angle evenly excessively at the bottom of at the bottom of the ship, the turn of the bilge depresses to hard chine, overcome ship bottom horizontal oblique ascension, help the bubble longitudinal movement and reduce the transstage bubble drag-reduction ship that drag-reduction effect was laterally escaped, improved to bubble.

The utility model solves the problems of the technologies described above the technical scheme that is adopted:

Hull bottom is provided with jet shallow disconnected level, and bilge portion has the hard chine that presses down, and presses down angle at 20～60 degree, and shallow disconnected level highly is 0.05～0.5 times of local boundary layer thickness, and shallow disconnected level lengthwise position is 30～40%Lbp apart from fore perpendicular.Keep former transstage ship aspect ratio (L/B) and slender degree coefficient simultaneously

Constant, do not change its wave making resistance characteristic and other performance characteristics.

Ramping angle is distributed as: when station number was 0, lift angle β was 5 at its end; When station number was 0.5, lift angle β was 6.2 at its end; When station number was 1, lift angle β was 7.8 at its end; When station number was 2, lift angle β was 10.4 at its end; When station number was 3, lift angle β was 13 at its end; When station number was 4, lift angle β was 15.1 at its end; When station number was 5, lift angle β was 16 at its end; When station number was 6, lift angle β was 17 at its end; When station number was 7, lift angle β was 21 at its end; When station number was 8, lift angle β was 31 at its end; When station number was 9, lift angle β was 48 at its end; When station number was 9.5, lift angle β was 53 at its end; When station number was 10, lift angle β was 54 at its end;

Keep former transstage ship aspect ratio (L/B) and slender degree coefficient simultaneously

The utlity model has following advantage:

1, low wave making resistance;

2, good seakeeping performance;

3, bubble control is better: bubble is controlled in the boundary 1ayer, bubble longitudinal movement smoothness, and bubble wide coverage, bubble are difficult for escaping from the turn of the bilge, and the bubble drag-reduction rate reaches more than 15%;

4, bubble is less to angle of rake influence;

5, ship molded lines type is simple, is easy to the construction of ships and light boats and improves the bubble drag-reduction rate.

Description of drawings

Be the utility model structural representation.

Among the figure, 1. shallow disconnected level, 2. air cavity.

The specific embodiment

According to the rule of bubble motion, the ship type that adopts end lift angle excessively uniformly to change is taken into account the influence to propulsion quality of the high efficiency of bubble drag-reduction and bubble, the lengthwise position of choose reasonable bubble generator.According to the notion of aeration in the boundary layer thickness scope, consider technologic realizability, determine that ships and light boats are shallow disconnected level ship type.Disconnected level height is determined according to the actual height and the technologic realizability of bubble spout, in the disconnected level wall air cavity is installed, and calms the anger in air cavity by modes such as compressors.The turn of the bilge is designed to have the hard chine that presses down.

Main technical details is as follows:

Shallow disconnected level height: 0.05～0.5 times of local boundary layer thickness

Disconnected level lengthwise position: apart from 30～40%Lbp of fore perpendicular

The turn of the bilge presses down angle: 20～60

Principal dimensions Loa=40m Lw=35.535m Lbp=35m B=7m T=1.2m scale ratio Lw/B=5.08

Claims

1. transstage bubble drag-reduction ship, it is characterized in that: hull bottom is provided with jet shallow disconnected level (1), in shallow disconnected level (1) wall air cavity (2) is installed, bilge portion has the hard chine that presses down, press down angle at 20～60 degree, shallow disconnected level highly is 0.05～0.5 times of local boundary layer thickness, and shallow disconnected level lengthwise position is 30～40%Lbp apart from fore perpendicular.

2. transstage bubble drag-reduction ship according to claim 1, it is characterized in that: its ramping angle is distributed as: when station number was 0, lift angle β was 5 at its end; When station number was 0.5, lift angle β was 6.2 at its end; When station number was 1, lift angle β was 7.8 at its end; When station number was 2, lift angle β was 10.4 at its end; When station number was 3, lift angle β was 13 at its end; When station number was 4, lift angle β was 15.1 at its end; When station number was 5, lift angle β was 16 at its end; When station number was 6, lift angle β was 17 at its end; When station number was 7, lift angle β was 21 at its end; When station number was 8, lift angle β was 31 at its end; When station number was 9, lift angle β was 48 at its end; When station number was 9.5, lift angle β was 53 at its end; When station number was 10, lift angle β was 54 at its end.