CN213928606U

CN213928606U - Tidal current energy water turbine

Info

Publication number: CN213928606U
Application number: CN202022557169.0U
Authority: CN
Inventors: 刘永辉; 王树杰; 谭俊哲; 孙浩伟; 薛宇; 袁鹏; 司先才
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-08-10
Anticipated expiration: 2030-11-09

Abstract

The utility model discloses a trend can hydraulic turbine. The generator is fixed on the base through an upright post, a plurality of blades are arranged on a hub of the generator, a plurality of suppressors are further arranged on the blades and distributed along the length direction of the blades, each suppressor comprises a bottom plate and two side plates, a plurality of grooves are formed in the bottom plate, the side plates are arranged on corresponding side portions of the bottom plate, and the two side plates are arranged in a relatively inclined mode; an inflow area is formed between one end parts of the two side plates, an outflow area is formed between the other end parts of the two side plates, the width of the inflow area is smaller than that of the outflow area, and the bottom plate is arranged on the surface of the blade. The hydrodynamic performance of the blade is optimized, and the generating efficiency of the tidal current energy water turbine is improved.

Description

Tidal current energy water turbine

Technical Field

The utility model relates to a trend electricity generation technical field especially relates to a trend can hydraulic turbine.

Background

The ocean tide energy is taken as a clean renewable energy source and has the characteristics of high energy density, rich resources, small influence on the environment and the like. In recent years, research investment and capital support of governments and research institutions of various countries and countries around the world on tidal current energy power generation technology are increased, tidal current power generation devices of various types and specifications are developed, and the tidal current energy power generation technology is rapidly developed in the world. The tidal current energy water turbine power generation device converts the kinetic energy of water into the mechanical energy of blades of the water turbine, and then the mechanical energy is finally converted into electric energy through the conversion device. In the actual working flow field of the tidal current energy water turbine, the flow speed and the flow direction of the tidal current are unstable, namely, the blades are in a mixed flow state of laminar flow and turbulent flow. Under the condition, the boundary layer of the front edge of the wing profile of the tidal current energy water turbine is in a laminar flow state, and the boundary layer begins to separate when flowing at a certain position away from the front edge, so that the phenomenon of transition from laminar flow to turbulent flow occurs, the hydrodynamic performance of the blade is reduced, and the generating efficiency is low. How to design a technique that improves trend can hydraulic turbine generating efficiency is the utility model discloses the technical problem that will solve.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the tidal current energy water turbine is provided, the hydrodynamic performance of the blades is optimized, and the power generation efficiency of the tidal current energy water turbine is improved.

The utility model provides a technical scheme is, a tidal current energy water turbine, including generator and base, the generator passes through the stand to be fixed on the base, be provided with a plurality of blades on the wheel hub of generator, still be provided with a plurality of suppressors on the blade, a plurality of the suppressors distribute along the length direction of blade, the suppressor includes bottom plate and two curb plates, be formed with a plurality of recesses on the bottom plate, the curb plate sets up in the corresponding lateral part of bottom plate, two the curb plates relative slope arranges; an inflow area is formed between one end parts of the two side plates, an outflow area is formed between the other end parts of the two side plates, the width of the inflow area is smaller than that of the outflow area, and the bottom plate is arranged on the surface of the blade.

Further, the side plates are in a triangular plate structure, or the side plates are in a trapezoidal plate structure.

Further, along the direction from the flow inlet area to the flow outlet area, the height of the side plate is gradually increased.

Furthermore, a plurality of grooves are distributed on the bottom plate in an array mode.

Further, the side plates are arranged perpendicular to the bottom plate.

Further, the length of the side plate is L, the height of the side plate close to the outflow area is H, and L/H = 1.5-3.0.

Further, the thickness of the bottom plate is H, the depth of the groove is H, and H = (1.1-1.5) × H.

Further, the area of the groove accounts for 80% or more of the total area of the bottom plate.

Further, the middle part and the blade tip of the blade are provided with the suppressors.

Compared with the prior art, the utility model discloses an advantage is with positive effect: the plurality of suppressors are arranged on the surface of the blade, and can guide the water flow on the surface of the popular blade through the side plates arranged on the two sides of the bottom plate, so that the flow in the direction of the water flow is reduced, and the hydrodynamic performance of the blade is improved; more importantly, because the surface of the blade is provided with water flow, the specific gravity of the water flow is much heavier than that of air, therefore, through the matching grooves on the bottom plate, when the water flow passes near the grooves, small vortexes are generated, due to the suction of these small vortices, water flow molecules near the surface of the bottom plate are attracted to the vortices (i.e., turbulent), and at this time, in addition to the tip vortex generated by the leading edge of the blade airfoil, it also generates an attractive force on fluid molecules flowing near the surface of the baseplate, thereby can promote wing point vortex and boundary layer bottom fluid's momentum and energy exchange, realize better flow separation suppression effect, the recess cooperation on two curb plates and the bottom plate can the surperficial flow separation of effectual suppression blade, improves the characteristic of twisted on blade surface, promotes the lift-drag ratio of wing section, improves the hydrodynamic performance of blade, finally improves the capacitation of hydraulic turbine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an embodiment of the tidal current energy water turbine of the present invention;

fig. 2 is a schematic partial structural view of a blade in an embodiment of the tidal current energy water turbine according to the present invention;

fig. 3 is one of the perspective views of the suppressor in the embodiment of the tidal current energy water turbine according to the present invention;

fig. 4 is a front view of the suppressor in the embodiment of the tidal current energy water turbine of the present invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

fig. 6 is a second perspective view of the suppressor in the embodiment of the tidal current energy water turbine according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 6, the tidal current energy water turbine of the present embodiment generally includes a generator 100 and a base 300, the generator 100 is fixed on the base 300 through a pillar 301, and the base 300 is installed on the sea floor. And for the generator 100, a plurality of blade assemblies 200 are arranged thereon, and the blade assemblies 200 utilize tidal current to drive the generator 100 to operate so as to generate electricity.

Wherein the hydrodynamic properties of the blades are optimized to improve the power generation efficiency of the generator 100. The blade assembly 200, includes: the blade comprises a blade 1 and a plurality of suppressors 2, wherein the suppressors are distributed along the length direction of the blade and comprise a bottom plate 21 and two side plates 22, a plurality of grooves 211 are formed on the bottom plate, the side plates are arranged on the corresponding side parts of the bottom plate, and the two side plates are oppositely and obliquely arranged; an inflow area is formed between one end parts of the two side plates, an outflow area is formed between the other end parts of the two side plates, the width of the inflow area is smaller than that of the outflow area, and the bottom plate is arranged on the surface of the blade.

In particular, during actual use, as the water flows through the vanes, the water flow will be affected by the inhibitor. The method specifically comprises the following steps: two slopes that the inhibitor set up are arranged the curb plate can lead to the flow direction of rivers to, because rivers pass through two during between the curb plate, the space crescent and then play the effect that slows down to rivers to reduce the spanwise flow of rivers, the hydrodynamic property of effectual improvement blade. Meanwhile, for the water flow layer contacting with the blade, when the water flow flows through the bottom plate, under the influence of the groove, the water flow flowing through the groove generates a suction area with a plurality of vortexes, and then a plurality of small vortexes are formed in the water flow, and the vortexes formed by the groove enable the water flow layer far away from the bottom plate to be effectively attracted to achieve the turbulent flow effect, so that the momentum and energy exchange between the wing tip vortex and the fluid at the bottom of the boundary layer can be promoted, and the better flow separation inhibiting effect can be realized.

For the side plates, various structural forms can be adopted, such as: the side plates are in a triangular plate structure, or in a trapezoidal plate structure. And in order to better guide the water flow, the height of the side plate is gradually increased along the direction from the inflow area to the outflow area. Further, the length of the side plate is L, the height of the side plate close to the outflow area is H, and L/H = 1.5-3.0. Specifically, the relation between the overall length and the height of the suppressor also affects the energy of the "wing tip vortex", and the length-height ratio is smaller than the small energy of the "wing tip vortex", and the length-height ratio is larger than the additional resistance generated by the large length-height ratio, so the length-height ratio is preferably L/H = 1.5-3.0 in general, and the requirement of generating the vortex can be met, and the resistance can be reduced. In addition, the side plates are perpendicular to the bottom plate, so that the flow guide effect of the side plates is improved.

Furthermore, a plurality of grooves are distributed on the bottom plate in an array mode. Specifically, a plurality of grooves can be uniformly arranged on the bottom plate in an array manner, so that the area of the bottom plate is utilized to the maximum extent. Wherein the area of the groove accounts for 80% or more of the total area of the bottom plate. And the recess may be a spherical recess (as shown in fig. 3) or a cylindrical recess (as shown in fig. 6). Preferably, a spherical groove is adopted, and the diameter d of the groove is preferably within the range of 2 mm-6 mm. Said grooves with a diameter d above 2mm favour the turbulence, whereas said grooves with a diameter d below 6mm do not impair or influence the original shape of the blade airfoil. In addition, the thickness of the bottom plate is H, and the depth of the groove is H, H = (1.1-1.5) × H.

Further, the center portion and the tip of the blade are provided with the inhibitor. Specifically, the middle part and the tip of the blade are the parts mainly absorbing tidal current energy, and the root of the blade mainly plays a role in bearing load and connecting the blade with the hub of the generator 100.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A tidal current energy water turbine comprises a generator and a base, wherein the generator is fixed on the base through a stand column, and a plurality of blades are arranged on a hub of the generator; an inflow area is formed between one end parts of the two side plates, an outflow area is formed between the other end parts of the two side plates, the width of the inflow area is smaller than that of the outflow area, and the bottom plate is arranged on the surface of the blade.

2. The tidal current energy water turbine of claim 1, wherein the side plates are in a triangular plate structure, or the side plates are in a trapezoidal plate structure.

3. The tidal current energy turbine of claim 2, wherein the height of the side plates gradually increases along the direction from the inflow region to the outflow region.

4. The tidal current energy water turbine of claim 1, wherein a plurality of grooves are distributed on the bottom plate in an array.

5. The tidal current energy turbine of claim 1, wherein the side plates are arranged perpendicular to the bottom plate.

6. The tidal current energy water turbine of claim 1, wherein the length of the side plate is L, and the height of the side plate near the outflow region is H, wherein L/H = 1.5-3.0.

7. The tidal current energy water turbine as set forth in claim 1, wherein the thickness of the bottom plate is H, and the depth of the groove is H, H = (1.1-1.5) × H.

8. The tidal current energy turbine of claim 1, wherein the area of the grooves is 80% or more of the total area of the bottom plate.

9. The tidal current energy turbine of any one of claims 1 to 8, wherein the center portion and the tip of the blade are provided with the inhibitor.