CN102001416A

CN102001416A - Stem wave elimination device

Info

Publication number: CN102001416A
Application number: CN2010105472443A
Authority: CN
Inventors: 胡健; 黄胜; 马骋; 齐慧博
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2010-11-17
Filing date: 2010-11-17
Publication date: 2011-04-06

Abstract

The invention provides a stem wave elimination device, which comprises a pipeline arranged in the stem and a propeller arranged in the pipeline. The device of the invention can efficiently reduce wave resistance, frictional resistance and differential pressure resistance. An impeller can generate electricity by utilizing the tail flow of the propeller so as to save energy. The device can improve a finished ship and has a function of reducing the wave-making resistance, frictional resistance and sticky pressure resistance.

Description

The stem wave damper

Technical field

What the present invention relates to is a kind of ship structure, specifically a kind of ship drag reduction structure, particularly a kind of stem wave damper.

Background technology

Rapidity is one of important performance of boats and ships, the quality of rapidity, concerning boats and ships, will influence the usability and the economy of boats and ships to a certain extent, ship resistance and performance comprises ship resistance and propulsion of ship two aspects, and the underway resistance problem of research boats and ships has significant role to improving ship resistance and performance.

Ship resistance mainly can be divided into three parts: wave making resistance, friction drag and viscous pressure resistance.Boats and ships rise wave in motion process, changed hull surface distribution of pressure situation, thisly cause that by wave making distribution of pressure changes the resistance produced and is called wave making resistance, during ship motion,, thereby can around hull, produce tangential forces because glassware for drinking water has stickiness, it sense of motion to make a concerted effort be friction drag, same because glassware for drinking water has stickiness, can cause hull front and back pressure imbalance, the resistance of Chan Shenging is called viscous pressure resistance like this.

The method of currently used minimizing ship resistance mainly is that the ship type is optimized, and generally can only use at the beginning of ship design, in case fixing will being difficult to changes, has significant limitation.

Summary of the invention

The object of the present invention is to provide a kind of rational in infrastructure, simple installation, drag-reduction effect is good, cost is low, be easy to boats and ships wave damper that existing ship is transformed.

The object of the present invention is achieved like this:

Comprise being arranged on stem in-to-in pipeline, be provided with screw propeller at pipe interior.

The present invention can also comprise:

1, described entrance place angle is a level, and is inner by at the bottom of the fillet vessel turning at stem.

2, turbine is installed behind the screw propeller in pipeline, the impeller machine driving generator, the energy storage that electrical generator produces is in the electric energy reservoir.

Common ship is in when navigation, foremost part of ship make water forward, upward movement, water surface protuberance forms wave, the generation of wave has increased the total drag of boats and ships greatly, as shown in Figure 1.After the stem wave damper is installed, at foremost part of ship, because the swabbing action of wave damper, during ship's navigation, water no longer swells the formation wave owing to the promotion of boats and ships, but moves along the downward rear of wave damper fast speed, avoid the generation of wave, as shown in Figure 2.

No wave damper boats and ships are in when navigation, and water is opposite for the sense of motion of the sense of motion of boats and ships and boats and ships self, and therefore the friction force that produces is a resistance, as shown in Figure 3.Because the swabbing action of wave damper, water is identical for the sense of motion of the sense of motion and boats and ships self of boats and ships, and therefore the friction force that produces is a thrust.Because the screw propeller oar axle and the water surface in the pipeline have certain included angle, therefore can produce downward power simultaneously, make boats and ships lift bow slightly, reduce the contact water area on boats and ships surfaces, also reduce the friction drag of boats and ships, as shown in Figure 4.

No wave damper boats and ships are in motion process, because the relative motion between fluid and the boats and ships has formed very big pressure, the sense of motion of this pressure and boats and ships is opposite, is resistance, as shown in Figure 5.The wave damper boats and ships are arranged when motion, because the swabbing action of wave damper, make the foremost part of ship fluid move along the fast downward rear of pipeline, can know by Bernou1li equation, fluid velocity is fast more, and pressure is more little, so this wave damper can reduce the pressure of stem, and then the pressure drag of reduction boats and ships, as shown in Figure 6.

Therefore the high speed revolution of fluid installs turbine at the pipeline middle part in the screw propeller high speed revolution drive pipeline, absorbs the rotating energy of current, and the generation electric energy also is placed in the electric energy reservoir, for illumination or other purposes, as shown in Figure 7.

Advantage of the present invention is: can effectively reduce wave drag, friction drag and pressure drag, turbine can utilize the wake flow of screw propeller to generate electricity, and plays energy-conservation effect.

The present invention can transform becoming ship, and to reducing wave making resistance, friction drag and viscous pressure resistance can both play a role.

Description of drawings

Fig. 1 common ship wave making principle;

The wave absorption principle of Fig. 2 band wave damper boats and ships;

Fig. 3 common ship waterplane stem fluid is with respect to the motion of boats and ships;

Fig. 4 is equipped with the motion of the boats and ships waterplane stem fluid of wave damper with respect to boats and ships;

Fig. 5 does not have the stem pressure of wave damper boats and ships;

Fig. 6 has the stem pressure of wave damper boats and ships;

Fig. 7 has the scheme drawing of turbine and energy reservoir;

Fig. 8 is a structural representation of the present invention.

The specific embodiment

For example the present invention is done more detailed description below in conjunction with accompanying drawing:

In conjunction with Fig. 8, described stem wave damper is positioned at foremost part of ship, in stem inside pipeline 3 is set, and the entrance angle is a level, at the bottom of the fillet vessel turning is passed through in inside; Pipe interior is provided with screw propeller 1, and the power mode of screw propeller is identical with the common conduit oar.Screw propeller in boats and ships advance process, because the swabbing action that the rotation of conduit internal propeller produces, make boats and ships the place ahead incoming flow no longer swell the formation wave, but move, thereby avoided the generation of wave along this downward rear of wave damper fast speed owing to the promotion of boats and ships; Because the swabbing action of wave damper, water (flow) direction changes near making stem, current are identical with respect to the sense of motion of the sense of motion and boats and ships self of boats and ships, thus the friction force direction that produced of hull and water also the sense of motion with boats and ships self is identical, be thrust, simultaneously, because the pipeline water export is alow, therefore can to boats and ships produce upward to thrust, make boats and ships lift bow slightly, reduce the contact water area on boats and ships surfaces, also reduced the friction drag of boats and ships; Because the swabbing action of wave damper makes the foremost part of ship fluid move along the fast downward rear of pipeline, has Bernou1li equation to know, the speed of fluid is fast more, and pressure is more little, therefore can reduce the pressure of stem, reduce the difference of pressure of boats and ships head and the tail, and then reduced the viscous pressure resistance of boats and ships; The conduit internal propeller is because high speed revolution drives ducted fluid high-speed rotation, therefore turbine 3 is installed behind the screw propeller in pipeline, can absorb the rotating energy of propeller race, the generation electric energy also is stored in the electric energy reservoir 4, can be for illumination and other purposes.

Claims

1. a stem wave damper is characterized in that: comprise being arranged on stem in-to-in pipeline, be provided with screw propeller at pipe interior.

2. stem wave damper according to claim 1 is characterized in that: described entrance place angle is a level, and is inner by at the bottom of the fillet vessel turning at stem.

3. stem wave damper according to claim 1 and 2 is characterized in that: turbine is installed behind the screw propeller in pipeline, and the impeller machine driving generator, the energy storage that electrical generator produces is in the electric energy reservoir.