Propeller structure capable of delaying cavitation

Abstract

The invention provides a propeller structure capable of delaying cavitation, and relates to the technical field of propellers, the propeller structure comprises a propeller blade, and a plurality of wedge blocks are arranged on the surface of the upper end of the propeller blade; the radial mounting range of the wedge-shaped blocks is as follows: 2-4 wedge-shaped blocks are arranged in the cavitation area of the propeller blade; the chordwise mounting range of the wedge-shaped block is 60%-80% of the thickness of the propeller blade from the guide edge to the mounting position; the mounting direction of the wedge-shaped block is as follows: the tip part is close to the guide edge of the propeller blade, the length edge is along the section of the propeller blade, the wedge-shaped block is vertically mounted on the surface of the propeller blade, the width of the wedge-shaped block is 20%-30% of the thickness of the propeller blade at the mounting position, the length of the wedge-shaped block is 60%-80% of the thickness of the propeller blade at the mounting position, and the thickness of the wedge-shaped block is 2%-3% of the thickness of the propeller blade at the mounting position. The method mainly aims at the shape, the installation number and the installation positions of the wedge-shaped blocks, and the effect of delaying cavitation is achieved under the condition that the performance of the propeller is affected as little as possible.

Description

Technical Field

[0001] The invention relates to the technical field of propellers, in particular to a propeller structure for delaying cavitation. Background Art

[0002] When a marine propeller is running in water, the back pressure of the blades decreases to form a suction surface. If the pressure at a certain point drops below the saturated vapor pressure, water will vaporize explosively, forming cavitation. Cavitation in the propeller will affect its hydrodynamic performance and reduce its service life.

[0003] In order to solve the above problems, we propose a propeller structure that delays cavitation to solve the above problems. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention provides a propeller structure for delaying cavitation.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: by installing 2-4 wedge blocks at the positions where cavitation is prone to occur on the propeller blades, when the propeller blades are running underwater, the wedge blocks installed on the surface of the propeller blades can generate relatively strong wingtip vortices. After this high-energy wingtip vortex is mixed with the low-energy boundary layer flow downstream, the boundary layer is suppressed, thereby delaying cavitation.

[0006] A propeller structure for delaying cavitation comprises a propeller blade, wherein the upper end surface of the propeller blade is provided with a plurality of groups of wedge blocks; the radial installation range of the wedge blocks is: within the area where cavitation occurs in the propeller blade, the number of the wedge blocks is 2-4; the chord-wise installation range of the wedge blocks is: 60% to 80% of the thickness of the propeller blade at the installation position from the guide edge.

[0007] Preferably, the installation direction of the wedge block is: the tip end is close to the guide edge of the propeller blade, the length side is along the cross-section of the propeller blade, and it is installed vertically on the surface of the propeller blade.

[0008] Preferably, the width of the wedge block is set to 20% to 30% of the thickness of the propeller blade at the installation position, the length is set to 60% to 80% of the thickness of the propeller blade at the installation position, and the thickness is 2% to 3% of the thickness of the propeller blade at the installation position.

[0009] Preferably, the wedge block has an outer shape that is configured as a right triangle.

[0010] Preferably, the wedge block is connected to the propeller blade by welding.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs 2-4 wedge blocks at positions where cavitation is prone to occur on propeller blades, so that when the propeller blades are running underwater, the wedge blocks installed on the surfaces of the propeller blades can generate relatively strong wingtip vortices. After the high-energy wingtip vortices are mixed with the low-energy boundary layer flow downstream, the boundary layer is suppressed. The present invention mainly lies in the shape, installation quantity and installation position of the wedge blocks, which play a role in delaying cavitation while minimizing the impact on the performance of the propeller blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle; Figure 3 It is a schematic diagram of the structure of the wedge block in the present invention.

[0013] In the figure: 1. propeller blade; 2. wedge block. DETAILED DESCRIPTION

[0014] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows: the main technology of the present invention lies in the shape, installation quantity and installation position of the wedge block 2, which plays a role in delaying cavitation while minimizing the impact on the performance of the propeller blade 1.

[0015] Example: Refer to Figure 1 - Figure 3 As shown, a propeller structure for delaying cavitation in this embodiment includes a propeller blade 1, and a plurality of groups of wedge-shaped blocks 2 are arranged on the upper end surface of the propeller blade 1; The radial installation range of the wedge blocks 2 is: within the area where the propeller blades 1 cavitation occurs, and the number is 2-4. The range of the area where the propeller blades 1 cavitation occurs can be calculated by the existing technology.

[0016] The chord-wise installation range of the wedge block 2 is: 60% to 80% of the thickness of the propeller blade 1 at the installation position from the guide edge; The installation direction of the wedge block 2 is: the tip end is close to the leading edge of the propeller blade 1, the length side is along the cross section of the propeller blade 1, and it is installed vertically on the surface of the propeller blade 1.

[0017] In some examples, the width of the wedge block 2 is set to 20% to 30% of the thickness of the propeller blade 1 at the installation position, the length is set to 60% to 80% of the thickness of the propeller blade 1 at the installation position, and the thickness is 2% to 3% of the thickness of the propeller blade 1 at the installation position.

[0018] In some examples, the wedge block 2 is configured to have an outer shape of a right triangle.

[0019] In some examples, the wedge block 2 is connected to the propeller blade 1 by welding.

[0020] The working principle of the present invention is: By installing 2 to 4 wedge blocks 2 at the position where cavitation is prone to occur on the propeller blade 1, when the propeller blade 1 is running underwater, the wedge blocks 2 installed on the surface of the propeller blade 1 can generate relatively strong wingtip vortices. After the high-energy wingtip vortex is mixed with the low-energy boundary layer flow downstream, the boundary layer is suppressed, thereby delaying the cavitation of the propeller blade 1.

[0021] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A propeller structure for delaying cavitation, characterized in that: It comprises a propeller blade (1), wherein the upper end surface of the propeller blade (1) is provided with a plurality of groups of wedge-shaped blocks (2); The radial installation range of the wedge blocks (2) is: within the area where cavitation occurs in the propeller blades (1), and the number of the wedge blocks (2) is 2 to 4; The chord-wise installation range of the wedge block (2) is: 60% to 80% of the thickness of the propeller blade (1) at the installation position from the guide edge; The installation direction of the wedge block (2) is such that the tip portion is close to the guide edge of the propeller blade (1), the length side is along the cross section of the propeller blade (1), and the wedge block (2) is installed vertically on the surface of the propeller blade (1).

2. A propeller structure for delaying cavitation according to claim 1, characterized in that: The width of the wedge block (2) is set to 20% to 30% of the thickness of the propeller blade (1) at the installation position, the length is set to 60% to 80% of the thickness of the propeller blade (1) at the installation position, and the thickness is 2% to 3% of the thickness of the propeller blade (1) at the installation position.

3. A propeller structure for delaying cavitation according to claim 2, characterized in that: The wedge-shaped block (2) is configured to have an outer shape of a right triangle.

4. A propeller structure for delaying cavitation according to claim 3, characterized in that: The wedge-shaped block (2) is connected to the propeller blade (1) by welding.

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