CN2606195Y

CN2606195Y - Blades of blowing apparatus

Info

Publication number: CN2606195Y
Application number: CNU022449620U
Authority: CN
Inventors: 张维智
Original assignee: Mianyang Zhongtian Science & Technology Co ltd
Current assignee: Mianyang Zhongtian Science & Technology Co ltd; Jiangsu Zhongtian Technology Co Ltd
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-03-10
Anticipated expiration: 2012-11-29

Abstract

The utility model relates to blades of blowing apparatus. The utility model is characterized in that the lower surface of the rear rim of the blade noumenon is provided with a serrate flap with the height of 2-4 percent of the local chord length, the vertex angle theta of the saw tooth is not more than 90 degrees, and the included angle gamma of the local chord and the saw tooth is not more than 90 degrees. The blades of blowing apparatus can be applied to the design of blades of large, medium, small scale blowing apparatuses and the design of blades with rotating lifting surface.

Description

Pneumatic equipment blades made

One, technical field

The utility model relates to the improvement to pneumatic equipment blades made.Be applicable to the design of large, medium and small pneumatic equipment blades made and the impeller design of band rotation lifting surface.

Two, background technique

Pneumatic equipment blades made trailing edge design is both at home and abroad at present all adopted and is not with the flow separation control technique, and trailing edge generally is designed to flat segments, does not make full use of favourable whirlpool separation and is separated from each other perturbation technique.The defective of the pneumatic equipment blades made of conventional art design is that the wind wheel Wind Power Utilization efficient of wind energy conversion system is low, the startup wind speed height of wind energy conversion system.

Three, summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, design and a kind ofly can maximally utilise the lift-rising drag reduction that interfering with each other of flow separation carried out aerofoil profile, thereby improve the Wind Power Utilization efficient of wind mill wind wheel and reduce the pneumatic equipment blades made external form that wind mill wind wheel starts wind speed.

The utility model is achieved in that

A kind of pneumatic equipment blades made comprises blade body, it is characterized in that being provided with the flexuose wing flap at blade body trailing edge lower surface place.

Further scheme is: the height of flexuose wing flap is the 2-4% of local chord length.

Further scheme is: the vertex angle theta of sawtooth is not more than 90 °.

Further scheme is again: the angle γ of sawtooth and local string is not more than 90 °.

Along with hydromechanical development in modern age, control separates, and utilizing the favourable interference that separates is the direction of current fluid mechanics research.The pneumatic equipment blades made technology of band trailing edge serrations wing flap relates to aerodynamics, fluid mechanics, Wind Engineering field.The utility model is on the basis of carrying out repeatedly wind-tunnel investigation, determines size and the height and the mounting point of best trailing edge serrations.

The vane design of wind turbines technology of band trailing edge serrations wing flap is to make the flow separation behind the accelerating region at trailing edge lower surface place not be delivered to the blade upper surface, reduce tail district, back turbulent flow to the mobile influence of blade upper surface, thereby change the vorticity of blade lower surface trailing vortex layer, the vorticity variance ratio on the whole surface of blade is increased, redistribute whole blade power and moment on every side, improve the maximum lift-drag ratio of aerofoil profile, reached the wind wheel Wind Power Utilization efficient that increases wind energy conversion system.When incoming flow flows through the trailing edge serrations wing flap, produce instantaneous differentially owing to the difference that flows drives blade, so advantageously improved the startup wind speed of wind energy conversion system.

The flow separation control technique of trailing edge serrations wing flap blade trailing vortex layer.Promptly adopt and the high sawtooth wing flap of local 2-4% chord length at trailing edge lower surface place, the angle r=0 of sawtooth and local string °～90 °, the vertex angle theta of sawtooth=0 °～90 °.Adopt the blade of this art designs, on the FD2.8-500Wyc wind energy conversion system, use and in wind-tunnel, carried out verification experimental verification.From results of wind tunnel, the sawtooth wing flap is controlled the flow separation of blade trailing vortex layer effectively, make the Cpmax=0.422 of wind energy conversion system be increased to Cpmax=0.462, power coefficient improves about 10%, and complete machine starts wind speed and drops to V startup=2.5m/s from V startup=3.5m/s.Adopted the good sawtooth Buddhist nun wing flap of optimization to carry out this new technology of FLOW CONTROL of trailing vortex layer at the trailing edge lower surface, all do not reported both at home and abroad at present.

Innovation point:

1) the new blade design is to adopt amended " momentum-foline " theory to design and optimal design with " vortex-foline " theory is counter, and by carrying out the modification design of blade after the wind tunnel test checking again, determines satisfied blade profile at last;

2) aerofoil profile of new blade then adopts amended Stratford (this shape volt moral) pressure distribution to design.In order to reduce the startup wind speed, improve utilization ratio of wind energy, adopt the design proposal of sawtooth wing flap at trailing edge lower surface place, purpose is to make the interior flow separation of accelerating region at trailing edge lower surface place not be delivered to the blade upper surface, thereby change the vorticity of blade lower surface trailing vortex layer, reduce the vorticity variance ratio of lower surface.Redistribute power and moment around the blade, when having improved the wind wheel Wind Power Utilization efficient of wind energy conversion system, improved the startup wind speed of wind energy conversion system again, for this system in the popularization of not having the low wind speed area of electricity with use is played and important positive role;

3) Security of wind energy conversion system is to adopt the tilting design principle that upwarps of tail vane to carry out.The tilting of tail vane is the tail district that makes after tail vane is avoided wind wheel, and purpose is to improve the efficient of tail vane.Upwarping of tail vane then is that horn balance equation by acting on the aerodynamic force on the wind wheel and acting on tail vane designs.When incoming flow wind speed during greater than design wind speed, tail vane begins to upwarp, and makes wind wheel deflection by the aerodynamic force that acts on the tail vane, adopts the tilting safety of protecting motor and system that upwarps of tail vane thereby reached.

Main effect: the 1) maximum lift-drag ratio of raising blade section aerofoil profile;

2) increase blower fan wind wheel utilization ratio;

3) the startup wind speed of reduction wind energy conversion system;

4) be adapted to the effect of various band rotation lifting surface impeller gaining rate noise reduction.

Four, accompanying drawing and explanation

Fig. 1 is an embodiment's of the present utility model three-dimensional reference drawing.

Fig. 2 is an embodiment's of the present utility model plan view.

Fig. 3 is the A-A sectional view of Fig. 2

Fig. 4 is the B-B sectional view of Fig. 2

Fig. 5 is the C-C sectional view of Fig. 2

Fig. 6 is the D-D sectional view of Fig. 3

Fig. 7 is the E-E sectional view of Fig. 3

Fig. 8 is the F-F sectional view of Fig. 3

Fig. 9 is the G-G sectional view of Fig. 3

Figure 10 is the H-H sectional view of Fig. 3

Figure 11 is the I-I sectional view of Fig. 3

Figure 12 is the J-J sectional view of Fig. 3

Among the figure: the 1-rotating center, 2-starches hub, 3-blade body, 4-flexuose wing flap, the 5-1/4 string of a musical instrument, θ-sawtooth drift angle, C-chord length, JY-sawtooth wing flap height, the angle of r-sawtooth and local string

Five, implementation

Below in conjunction with accompanying drawing the utility model is described further.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12.A kind of pneumatic equipment blades made comprises blade body 3, it is characterized in that being provided with flexuose wing flap 4 at blade body 3 trailing edge lower surface places.The height JY of flexuose wing flap 4 is 2% of local chord length C.The vertex angle theta of sawtooth is 60 °.The angle γ of sawtooth and local string is 30 °.

From the model machine results of wind tunnel, sawtooth wing flap 4 is controlled the flow separation of blade trailing vortex layer effectively, makes the Cp of wind energy conversion system _Max=0.422 is increased to Cp _Max=0.462, power coefficient improves about 10%, and complete machine starts wind speed from V _Start=3.5m/s drops to V _Start=2.5m/s.

Claims

1, a kind of pneumatic equipment blades made comprises blade body (3), it is characterized in that being provided with flexuose wing flap (4) at blade body (3) trailing edge lower surface place.

2, pneumatic equipment blades made according to claim 1, the height JY that it is characterized in that flexuose wing flap (4) is the 2-4% of local chord length C.

3, pneumatic equipment blades made according to claim 1 and 2 is characterized in that the vertex angle theta of sawtooth is not more than 90 °.

4, pneumatic equipment blades made according to claim 1 and 2 is characterized in that the angle γ of sawtooth and local string is not more than 90 °.