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Novel blade used for ocean current power generation turbine

An ocean current power generation and turbine technology, applied in the field of turbine blades, can solve the problems of small self-weight, low efficiency, and large blade self-weight, and achieve the effects of small self-weight, high efficiency, and avoidance of cavitation.

Active Publication Date: 2012-02-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of the blades in the prior art that the blades are self-heavy, the kinetic energy of the turbine seawater is converted into mechanical energy, the efficiency is low, seawater with a high flow rate is required to obtain a high speed of the turbine, and the blades are prone to cavitation and cavitation erosion, the present invention proposes a blade with a small weight , The efficiency of the turbine is high, no cavitation cavitation occurs, and only low-velocity seawater can make the turbine obtain high-speed blades for ocean current power generation turbines

Method used

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  • Novel blade used for ocean current power generation turbine
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  • Novel blade used for ocean current power generation turbine

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Embodiment 1

[0018] refer to Figure 1-3

[0019] A new type of blade for an ocean current power generation turbine, the blade 1 includes a wing root 11 close to the turbine rotor and a wing tip 12 away from the rotor, and the cross section of the blade 1 adopts NACA series airfoils; It is characterized in that: the chord length of the blade 1 gradually becomes shorter along the blade root 11 to the wing tip 12, and the thickness of the blade 1 gradually becomes thinner along the blade root to the wing tip.

[0020] The leading edge 13 of the blade 1 is straight, and the trailing edge 14 of the blade 1 is an elliptic curve of a quarter of the front concave.

[0021] The ratio of the length of the wing tip 12 of the blade 1 to the length of the wing root 11 is 1:3.

[0022] The concept of the present invention is: the blade 1 is gradually shortened along the wing root 11 to the wing tip 12 chord length 15, and the thickness is gradually thinned, so that the volume of the blade 1 is reduce...

Embodiment 2

[0025] refer to Figure 4 , 5 , in combination with the actual situation, this embodiment is described:

[0026] The specific implementation of the present invention will be further described below with the airfoil chord length c as the unit 1.

[0027] The cross section of the blade adopts NACA4415 airfoil, the maximum camber f is 4% of the chord length, and the maximum camber position x f The distance from the leading edge is 40% of the chord length, and the maximum thickness d is 15% of the chord length.

[0028] The blade adopts an elliptical airfoil whose length ratio between the wing tip and the wing root is 1:3 in the longitudinal section, the length a of the wing tip is about 0.333, the length b of the wing root is 1, the leading edge 1 is a vertical straight line, and the trailing edge gradient line 2 is a quarter elliptic curve x 2 0.66 7 2 ...

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Abstract

The invention provides a novel blade used for an ocean current power generation turbine. The blade comprises a wing root close to a turbine rotor and a wing tip far away from the rotor; the transverse section of the blade is of an NACA series airfoil type; and the chord length of the blade continuously changes from big to small from the wing root to the wing tip, and the thickness of the blade gradually becomes smaller from the wing root to the wing tip. The blade has the advantages of small deadweight, and high turbine efficiency, and can make the turbine get high rotary speed just by low-flow rate sea water, and avoid the cavitation erosion when the turbine rotates at a high speed.

Description

technical field [0001] The invention relates to a blade of a turbomachine, in particular to a blade used for an ocean current power generating turbine. technical background [0002] Ocean current energy is a clean and renewable energy source. The use of ocean current energy technology to generate electricity is conducive to improving the energy structure and reducing environmental pollution and climate change problems caused by fossil energy consumption. Ocean current energy is the most accessible and flexible energy in ocean energy. The ocean current power generation turbine is to drive the turbine to rotate through the flow of seawater, and convert the kinetic energy of seawater into the mechanical energy of the turbine. Among them, the efficiency, cavitation performance and stability of the turbine are three important indicators affecting the performance of the generating set. [0003] Cavitation is a physical phenomenon unique to flowing liquids. It is a fluid dynamics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/12
CPCY02E10/223Y02E10/20
Inventor 董志勇张旭王立韩伟俞小伟朱芳颜效凡李晓鹏
Owner ZHEJIANG UNIV OF TECH