CN212637881U

CN212637881U - Concave-convex ship rudder with different cross section thicknesses

Info

Publication number: CN212637881U
Application number: CN202022035098.8U
Authority: CN
Inventors: 朱文才; 胡国良; 陈慧; 李望笃; 木学山; 黄庆生; 江来; 徐宇鲲
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-03-02
Anticipated expiration: 2030-09-16

Abstract

The invention discloses a ship rudder with concave-convex surfaces with different cross section thicknesses, which is characterized in that the basic profile of the cross section of the ship rudder consists of two wing profiles with different thicknesses, and the chord lengths of the two wing profiles with different thicknesses are the same. Compared with the common rudder, the ship rudder with the concave-convex surface can increase the stall angle of the ship rudder, improve the lift force generated by the ship rudder under the same rudder angle and further improve the steering performance of the ship rudder. Under the same operation condition, the concave-convex ship rudder can reduce the negative effects caused by cavitation and the like of the ship rudder, and the service life of the ship rudder is prolonged.

Description

Concave-convex ship rudder with different cross section thicknesses

Technical Field

The invention relates to the technical field of improving the steering performance of ship rudders, in particular to a ship rudder with concave-convex surfaces with different cross section thicknesses.

Background

With the development of science and technology, the design of ship rudders is also changing continuously, in recent years of research on ship rudders at home and abroad, the research on flap rudders (formed by combining a main wing and a tail wing) is more, the efficiency of the rudders is mainly improved through design optimization, and fishtail type rudders, twisted rudders, protruding edge guide rudders and the like are researched. Due to the characteristics of the ship rudder: the hydrodynamic performance of the rudder of a ship will be greatly affected by the flow separation (i.e. stall) that exists during its actual operation. Under the same conditions, although reducing the thickness of the rudder increases the lift coefficient of the rudder, the corresponding stall angle is also reduced, which is detrimental to the actual operation of the rudder. If the thickness is too large, the steering performance of the rudder of the ship is reduced, so that various working conditions of the ship can be comprehensively considered when the type of the rudder of the ship is selected, and the steering performance of the rudder is improved under the condition that the rudder of the ship is prevented from stalling as far as possible. Therefore, it is a very significant issue how to overcome or suppress the stall of the rudder of the ship and improve the lift coefficient of the rudder of the ship.

Disclosure of Invention

According to the technical problems that the thickness of the basic outline of the ship rudder influences the steering performance of the ship rudder and the like, the ship rudder with the concave-convex surfaces with different cross section thicknesses is provided. The invention designs the basic outline of the ship rudder into two airfoil structures with different thicknesses, namely a thick airfoil section and a thin airfoil section. When the ship rudder with concave-convex surface runs, the flow state of water near the surface of the ship rudder can be changed, so that the fluid can be kept attached to the suction surface of the ship rudder with concave-convex surface, therefore, the large separation vortex can be overcome or delayed due to the difference of the section thickness. And then improve the lift coefficient of boats and ships rudder, improve the steering performance of boats and ships rudder.

The technical scheme adopted by the invention is as follows: a concave-convex ship rudder 1 with different cross section thicknesses is disclosed, wherein the basic outline of the ship rudder cross section is composed of two wing-shaped structures with different thicknesses.

The ship rudder 1 with the concave-convex surface comprises a thin wing section 2 and a thick wing section 3.

The chord lengths of the thick airfoil section 3 and the thin airfoil section 2 are equal, namely the leading edge 4 and the trailing edge 5 of the ship rudder 1 with the concave-convex surface are formed to be straight lines.

The difference between the maximum thickness of the thick airfoil section 3 and the maximum thickness of the thin airfoil section 2 is greater than zero, i.e. in the side view schematic of the concave-convex rudder the surface 6 of the rudder is in the form of a sine-like wave instead of a straight line.

Due to the characteristics of the ship rudder, the ship rudder can generate flow separation during actual work, a large separation vortex phenomenon occurs, and the hydrodynamic performance of the ship rudder can be greatly influenced due to the existence of the large separation vortex.

Compared with the common rudder, the ship rudder with the concave-convex surface can increase the stall angle of the ship rudder, improve the lift force generated by the ship rudder under the same rudder angle and further improve the steering performance of the ship rudder. Under the same operation condition, the concave-convex ship rudder can reduce the negative influence caused by the cavitation of the ship rudder and prolong the service life of the ship rudder.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The drawings in the following description are of one embodiment of the invention and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive exercise.

Fig. 1 is a schematic structural view of the ship rudder with the concave-convex surface.

Fig. 2 is a schematic front view of the ship rudder with concave-convex surfaces.

Fig. 3 is a schematic side view of the concave-convex rudder according to the present invention.

Fig. 4 is a schematic top view of the rudder of the present invention.

Wherein, 1 is the ship rudder of concave-convex face, 2 is thin wing section, 3 is thick wing section, 4 is leading edge, 5 is the trailing edge, 6 is the surface of ship rudder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, one embodiment of the present invention proposes a rudder 1 for a ship having a concave-convex surface with different cross-sectional thicknesses, which includes: thin airfoil section 2, thick airfoil section 3, leading edge 4 and trailing edge 5.

As shown in fig. 2, the leading edge 4 and trailing edge 5 of the rudder are linear.

As shown in fig. 3, the thin airfoil section 2 and the thick airfoil section 3 of the concave-convex ship rudder have different maximum thicknesses, the thin airfoil section 2 and the thick airfoil section 3 alternately exist at equal intervals in the spanwise direction and are sequentially connected through a B-spline surface, so that a surface 6 of the ship rudder is formed, the surface 6 of the ship rudder presents a sine-like wave in a side view schematic diagram, and the surface of a traditional ship rudder presents a straight line in a side view schematic diagram.

As shown in fig. 4, the thin airfoil section 2 and the thick airfoil section 3 have a certain difference in coordinate points except that they are overlapped at the leftmost side (leading edge) and the rightmost side (trailing edge).

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides a different concavo-convex face boats and ships rudder of cross section thickness (1), its characterized in that: the basic outline of the cross section of the ship rudder consists of two airfoil structures with different thicknesses;

the ship rudder (1) with the concave-convex surface comprises a thin wing section (2) and a thick wing section (3);

the chord lengths of the thick airfoil section (3) and the thin airfoil section (2) are equal, namely the leading edge (4) and the trailing edge (5) of the ship rudder (1) with the concave-convex surface are straight lines;

the difference between the maximum thickness of the thick airfoil section (3) and the maximum thickness of the thin airfoil section (2) is greater than zero, i.e. in the side view schematic diagram of the concave-convex rudder, the surface (6) of the rudder is in the form of a sine-like wave instead of a straight line.