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propeller

A technology of propellers and blades, applied in the field of high-efficiency and low-noise hydrodynamic propellers, to achieve the effects of improving efficiency, reducing cavitation pulsation pressure and noise, and improving propulsion efficiency

Active Publication Date: 2017-09-01
上海斯玛德大推船用螺旋桨设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The theory of ship propeller has been developed for hundreds of years. The technical means to improve its performance through traditional methods such as diameter, disk surface ratio and skew optimization have almost reached the extreme. The further performance of propeller efficiency, cavitation pulsation pressure and noise Improvement has encountered a large technical bottleneck

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 2 It is a schematic diagram of the projected outline of the blade 2 of the propeller 100 according to the first embodiment of the present invention. Such as figure 2 As shown, the propeller 100 includes a hub 1 and a blade 2 connected to the hub 1, the lower end of the blade 2 connected to the hub 1 is the root of the blade, and the outermost end of the blade 2' is the tip of the blade. There are a plurality of protrusions 211 on the trailing edge 21 of the blade tip, and the plurality of protrusions 211 form a wave-shaped portion.

[0032] The wave-shaped edge-following propeller 100 is the same as the conventional propeller 100'. It needs to be designed according to the hull resistance, self-propulsion factor, wake field and main engine parameters. The hydrodynamic force of the designed propeller must meet the matching of ship-engine-propeller. Different from the conventional propeller 100', the propeller 100 is designed with more than two protrusions 211 o...

Embodiment 2

[0037] The structure of this embodiment is basically the same as that of the foregoing embodiments, and only their differences will be introduced below.

[0038] image 3 It is a schematic diagram of the projection profile of the blade 2 of the propeller 100 according to the second embodiment of the present invention. Such as image 3 As shown, the entire trailing edge 21 of the paddle 2 has a plurality of protrusions 211, and the plurality of protrusions 211 form a wave-shaped portion. In this way, the entire trailing edge 21 is formed into a wave-shaped trailing edge, which is more helpful for separating discrete concentrated vortices and suppressing tip vortex cavitation.

Embodiment 3

[0040] The structure of this embodiment is basically the same as that of the foregoing embodiments, and only their differences will be introduced below.

[0041] Figure 4 It is a schematic diagram of the projection profile of the blade 2 of the propeller 100 according to the third embodiment of the present invention. Such as Figure 4 As shown, there are a plurality of protrusions 211 on the trailing edge 21 of the blade tip, and the plurality of protrusions 211 form a zigzag portion. On the one hand, the zigzag part is easy to manufacture, and on the other hand, this shape is more conducive to dividing the discrete concentrated vortices and suppressing tip vortex cavitation.

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Abstract

The invention discloses a propeller (100), comprising a propeller hub (1) and a propeller blade (2) connected to the propeller hub (1), the lower end of the propeller blade (2) connected to the propeller hub (1) is a propeller blade The root, the outermost end of the blade (2) is the tip of the blade, the blade (2) has a trailing edge (21) and a leading edge (22), wherein at least the trailing edge (21) of the blade tip has More than two protrusions (211). In the present invention, the edge of the tip of the propeller and even the entire edge are designed to have protrusions, especially to form a saw-tooth or wave-shaped edge, thereby realizing the division of discrete concentrated vortices, suppressing and delaying the generation of tip vortex cavitation, and reducing air bubbles. Bubble pulsation pressure and noise, and improve propeller propulsion efficiency by creating favorable mutual interference between protrusions.

Description

technical field [0001] The invention relates to a propeller, in particular to a high-efficiency and low-noise hydrodynamic propeller with a new geometric configuration. Background technique [0002] Propeller is currently the most widely used form of propeller on various ships. It can convert about 70% of mechanical power into propulsion. It has the advantages of simple structure, low cost, convenient use and high efficiency. In the 21st century, environmental and energy issues are becoming more and more serious. As the main transportation force of commodity logistics, ship transportation consumes a lot of non-renewable energy and emits a lot of polluting gases and greenhouse gases in the shipping process. In response to this situation, the International Maritime Organization has launched a ship design energy efficiency index, which has been enforced in 2013. Therefore, it is imminent to develop ship hydrodynamic energy-saving technology. Improving propeller propulsion eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H1/18B63H1/26
Inventor 韩用波丁恩宝唐登海董郑庆辛公正
Owner 上海斯玛德大推船用螺旋桨设计有限公司