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Rotatable ship rudder with bulge front edges

A technology for ships and leading edges, which is applied in the direction of steering with rudder, ship parts, steering gear, etc. Hydrodynamic performance, effect of reducing cavitation erosion

Pending Publication Date: 2020-07-14
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the current ships use rectangular rudder blades. The rudder blades are integral, single-plate, symmetrical, thin, and airfoil-shaped, and generally use round leading edges. The focus of ship rudder transformation is seldom paid attention to the rudder blades. The leading edge, so the resistance is relatively large, which is not conducive to energy saving and emission reduction, is not conducive to improving the hydrodynamic performance, and is not conducive to the maneuvering of the ship. Therefore, the design of the rudder blade is a problem that needs to be solved

Method used

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  • Rotatable ship rudder with bulge front edges
  • Rotatable ship rudder with bulge front edges
  • Rotatable ship rudder with bulge front edges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, this embodiment provides a rotatable ship rudder with a bulging leading edge, the rudder includes a main rudder blade and a tail rudder blade, the tail rudder blade is arranged at the rear end of the main rudder blade, and the The front end of the main rudder blade is provided with a plurality of bulging leading edges protruding forward.

[0035] In this specific example, if figure 1 , figure 2 and Figure 6 As shown, the front end contour of the longitudinal section of the rudder is a parabola. The cross-sectional shape of the rudder is an airfoil. An auxiliary rudder stock is arranged between the main rudder blade and the tail rudder blade, and the tail rudder blade is rotatably arranged on the auxiliary rudder stock. A main rudder stock is arranged inside the main rudder blade, and the main rudder stock is used for connecting the main rudder blade with the hull.

[0036] like Figure 7 As shown, the front end longitudinal section conto...

Embodiment 2

[0039] This embodiment is an embodiment improved on the basis of the first embodiment.

[0040] In this specific example, if Figure 8 As shown, the front end longitudinal section contour lines of the plurality of bulge leading edges are semicircular.

[0041] like Figure 11 As shown, the transition between the body and the front edge of the bulge is a continuous curvature transition, that is, the curvature of the front edge of the bulge and the body at the connection points P1 and P2 are consistent, and the section line type of the front edge of the bulge is a Besser crossing P1, O, and P2 Seoul curve.

[0042] The radii of the plurality of bulge leading edges may be the same or different. The intervals between adjacent front edges of the bulges may be equal or unequal.

Embodiment 3

[0044] This embodiment is an embodiment improved on the basis of the first embodiment.

[0045] In this specific example, if Figure 9 As shown, the front contour lines of the plurality of bulge front edges are a plurality of semi-elliptical shapes arranged at intervals. The radii of the major axes or the minor axes of the multiple bulge leading edges may be the same or different. The intervals between adjacent front edges of the bulges may be equal or unequal.

[0046] The bulging leading edge protruding forward can play a role in stabilizing the flow. The geometric structure parameter selection of the bulging leading edge is related to the specific ship’s lateral sway angle and ship’s sailing speed. The continuous transition between the bulging leading edge structure and the curvature of the body is adopted to reduce the Flow separation improves the hydrodynamic performance of the fin stabilizer and reduces the fin stabilizer resistance during forward movement, thereby red...

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Abstract

The invention discloses a rotatable ship rudder with bulge front edges, which relates to the technical field of rudder structures. The rudder comprises a main rudder blade and a tail rudder blade, thetail rudder blade is arranged at the rear end of the main rudder blade, and the main rudder blade comprises a body and a plurality of bulge front edges which are arranged at the front end of the bodyand protrude forwards. The bulge front edge structure can improve the flow field structure, the main rudder blade and the tail rudder blade can increase the bending degree of the rudder blades, and the combination of the two can improve the hydrodynamic performance of the rudder and improve the stability of the ship; cavitation erosion can be reduced through the oval front edge or the curvature continuous front edge blade profile, and the service life of the rudder is effectively prolonged; the bulge front edge and the body curvature of the main rudder blade are in continuous transition combination, or the bulge front edge and the body ellipse of the main rudder blade are in transition combination, so that the rudder resistance during advancing can be reduced, and the oil consumption is reduced; the main rudder blade is connected with the ship body through the rudder stock, the tail rudder blade is connected with the ship body through the auxiliary rudder stock, bearing of the rudderstock can be reduced, and stability of the cantilever rudder is improved.

Description

technical field [0001] The invention relates to the technical field of ship rudder structures, in particular to a rotatable ship rudder with a bulging leading edge. Background technique [0002] The rudder is an important device to control the direction of the ship. It mainly includes the rudder blade and the rudder stock. The direction of the rudder blade is changed by the rotation of the rudder stock, thereby changing the flow of water, changing the force on the rudder blade, and then adjusting the direction of the ship. When the incoming flow direction of water is inconsistent with the sailing direction, the surface of the rudder blade will change, and the force on the rudder blade surface in the incoming flow direction will increase, and the stability of the rudder will decrease. [0003] In nature, humpback whales have superior maneuverability and flexibility in turning and other movements in water compared to aquatic creatures of the same size. It is attributed to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H25/38
CPCB63H25/38B63H2025/387
Inventor 杨凌钟兢军
Owner SHANGHAI MARITIME UNIVERSITY
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