CN201461226U

CN201461226U - Vane

Info

Publication number: CN201461226U
Application number: CN2009201107316U
Authority: CN
Inventors: 张明明; 黄宸武; 宋娟娟; 杨兵; 徐建中
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2009-08-05
Filing date: 2009-08-05
Publication date: 2010-05-12
Anticipated expiration: 2019-08-05

Abstract

Disclosed is a vane, wherein the front edge of the vane is in a whale fin shape, and the tail edge thereof is in an owl feather serrated shape, the tangential section thereof is a rough surface, and a vortex generator is further installed on the rough tangential section. The rough tangential section of the vane could be a rib, a spherical pit, a spherical bump, a triangle conical pit, a triangle conical bump, a polygonal conical pit or a polygonal conical bump. The utility model has the effects that the lift force of the vane is increased to the largest extent within the larger attack angle range, the resistance of the vane is reduced, the efficiency is improved, and the noise is reduced.

Description

A kind of blade

Technical field

The utility model relates to a kind of blade, and especially a kind of blade that is applicable to turbomachine and wind-driven generator field, this blade have increases lift, reduce resistance, raise the efficiency, reduce characteristics such as noise.

Background technique

Aspect the lift-rising drag reduction, the whale fin is had the effect of lift-rising drag reduction by experiment confirm, think that the whale fin has rough surface, wherein the part of projection helps to form vortex, these vortexs bring bigger power in mode more stably to whale, increased lift largely and reduced resistance, especially effect is obvious under the big angle of attack.

Aspect simple drag reduction, because skin friction resistance occupies very big ratio in the drag overall of means of transportation, for example: conventional transport airplane and waterborne vessel, its skin friction resistance accounts for 50% of drag overall, and submarine can reach 70%; Account for the 40-50% of its drag overall during aircraft flight; During long-distance pipe was carried, the power of pumping plant almost all was used to overcome skin friction resistance.So reduce skin friction resistance for energy-conservation be a job highly significant.Existing drag reduction measure has: rib drag reduction, non-smooth surface drag reduction, compliant wall drag reduction, polymeric additive drag reduction, hydrophobic coating drag reduction, micro gas-bubble drag reduction, Wall Vibration drag reduction, vortex generator drag reduction etc., wherein a part has obtained application in the equipment such as aircraft (submarine mine, submarine), boats and ships, aircraft, pipeline transportation system under water.Relevant patent has: Chinese patent 200610168925.2 is provided with aerodynamic feature elements on the pneumatic equipment blades made surface, comprises that waveform and concave-convex shape wait to improve fluid and flow and reduce resistance; Patent 200680045596.0 uses indenture on the horizontal axis wind-driven generator blade surface or projection reduces resistance; Patent 00134950.3 is applied in non-smooth surface on mouldboard and the meal spoon or the like.In addition, rib or the groove drag-reduction effect on wing panel, wing and aircraft also mentions generally in the Low Angle Of Attack scope drag-reduction effect being arranged in the literature; And vortex generator is applied aboard, and drag-reduction effect is considerable under the big angle of attack.

Aspect noise reduction, night, the action of cat owl was quiet, was because the flexuose trailing edge of feather has played effect to noise reduction.And the trailing edge noise is the main noise source of turbomachine and wind-driven generator.

Make a general survey of the above, the method of mentioned lift-rising drag reduction, synergy, noise reduction there is no on turbomachine and wind-driven generator well to be used, using also only is the imagination that is confined to certain drag reduction mode, such as non-smooth surface drag reduction and compliant wall drag reduction etc., seldom seeing has integrated application in practice.

The model utility content

The purpose of this utility model provides a kind of blade, with the effect of the lift-rising drag reduction, synergy and the noise reduction that improve blade.

For achieving the above object, the blade that the utility model provides, its leading edge is the whale fin-shaped, and the trailing edge of blade is cat owl feather flexuose, and the string face of blade is a non-smooth surface, or on smooth string face vortex generator is installed.

The utility model can also be installed vortex generator on the string face of non-smooth surface.

Non-smooth surface of the present utility model can be: rib, spherical pit, hemisphere jut, triangular pyramidal pit, triangular pyramidal projection, polygonal frustum pit and polygonal frustum projection.

Effect of the present utility model is, in big angle of attack scope, farthest increased the lift of blade, reduced the resistance of blade, improved efficient and reduced noise.

Description of drawings

Fig. 1 is a wind-driven generator complete machine front schematic view.

Fig. 2 is the utility model is installed vortex generator on the string face of non-smooth surface a blade schematic representation.

Fig. 3 is the utility model is installed vortex generator on the string face of rib-like a blade schematic representation.

Fig. 4 is that the section of v-shaped rib of the present utility model amplifies schematic perspective view.

Fig. 5 is the section enlarged diagram of spherical pit of the present utility model

Fig. 6 is the section enlarged diagram of hemisphere jut of the present utility model.

Fig. 7 is the section enlarged diagram of triangular pyramidal pit of the present utility model.

Fig. 8 is the section enlarged diagram of triangular pyramidal projection of the present utility model.

Fig. 9 is the section enlarged diagram of polygonal frustum pit of the present utility model.

Figure 10 is the section enlarged diagram of polygonal frustum projection of the present utility model.

Figure 11 is the enlarged diagram of vortex generator of the present utility model.

Embodiment

The method of the utility model use in conjunction lift-rising drag reduction, synergy, noise reduction, the mechanism of these methods of applying in a flexible way in turbomachine and wind-driven generator field, given play to speciality separately, to play the lift-rising drag reduction, to raise the efficiency, reduce anti noise maximum magnitude.

The utility model is on turbomachine or blade of wind-driven generator, the leading edge of blade is improved to the structure of imitative whale fin, trailing edge is improved to imitative cat owl feather flexuose, independent or use in conjunction rib-like, non-smooth surface and vortex generator structure on the mid-chord line face.

When air-flow inflow leading edge, air-flow is walked around after the imitative whale fin structure, flows and quickens, make air-flow keep adhering to mobile on blade, air-flow is directed forming vortex around hump motion at blade suction surface, strengthen the exchange with the free layer momentum, reduced suction gradient.When Low Angle Of Attack, lift and resistance and smooth leading edge do not have too big difference, when the big angle of attack, have than smooth leading edge that tangible lift increases, resistance reduces.

If a kind of following current in the non-smooth surface on the airflow passes string face to rib surface, because of it has increased the thickness of viscous sublayer, reduced the average velocity gradient on the wall, the rib spike has hindered the generation of the instantaneous lateral flow that is caused by turbulent motion, whole turbulence is changed reduce, thereby the surface friction drag of rib surface is reduced.Under Low Angle Of Attack, certain drag-reduction effect is arranged.If airflow passes is the non-smooth surface of other form, it can improve flowing of blade surface, reduces resistance.Vortex generator produces eddy current and makes in the main flow that the low-momentum air-flow exchanges or balance in the high momentum air-flow and boundary layer, blade face, thereby make air-flow in the boundary layer increase the momentum of flow direction, also increased near the air stream turbulence degree of eddy current, thereby the boundary layer separation that has stoped big back-pressure gradient to form reaches the boundary layer thickness that is caused by surface friction or back-pressure gradient to be increased, and has reduced resistance.Drag reduction is particularly considerable under the big angle of attack.The flexuose of imitative cat owl can reduce the interaction in blade trailing edge and blade surface whirlpool on the trailing edge, and noise is reduced.Its special way is: use in conjunction the method for lift-rising drag reduction, synergy, noise reduction, realize multiple scheme respectively, these schemes can be respectively:

1) imitative whale fin leading edge+non-smooth surface+imitative cat owl flexuose trailing edge;

2) imitative whale fin leading edge+vortex generator+imitative cat owl flexuose trailing edge;

3) imitative whale fin leading edge+non-smooth surface+vortex generator+imitative cat owl flexuose trailing edge.

Non-smooth surface wherein can be one or more in rib, spherical pit, hemisphere jut, triangular pyramidal pit, triangular pyramidal projection, polygonal frustum pit and the polygonal frustum projection.

Below in conjunction with accompanying drawing, be that example describes with the wind-driven generator.

As shown in Figure 1, the utility model is the blade 4 that is used on the wind-driven generator.Wind-driven generator is by pylon 1, cabin 2, wheel hub 3 and a plurality of blade 4 are formed, blade 4 is installed on the wheel hub 3, and when wind speed blowed to blade of wind-driven generator 4, wind acted on the blade 4, the kinetic energy of a part of wind is converted into promotion blade 4 rotating moment, make blade 4 drive wheel hubs 3 horizontal middle spindle rotation of 2, wind energy is converted into mechanical energy, by the generator in the cabin 2 mechanical energy is converted into electric energy output again around the cabin.

Please in conjunction with Fig. 2 and Fig. 3, blade 4 its leading edges 401 of the present utility model are imitative whale fin structure, and the trailing edge 405 of blade is equipped with vortex generator 404 for imitative cat owl flexuose on the string face of blade.String face of the present utility model can also be the non-smooth surface 403 of different shape.

Chord of blade face shown in Figure 2 is a non-smooth surface, on non-smooth string face, can be designed to rough surperficial 403, the shape of this non-smooth surface can be: rib-like surface (as shown in Figure 4), spherical pit shape surface (as shown in Figure 5), hemisphere jut shape surface (as shown in Figure 6), triangular pyramidal pit shape surface (as shown in Figure 7), triangular pyramidal convex surface (as shown in Figure 8), vortex generator 404 has also been installed in the combination of one or more in polygonal frustum pit shape surface (as shown in Figure 9) and the polygonal frustum convex surface (as shown in figure 10) on the string face.

Fig. 3 is the schematic representation that non-smooth surface of the present utility model is designed to single rib-like 402, and this rib-like 402 is that following current is to setting.The shape of vortex generator 404 is fixed on the string face as shown in figure 11.

Distinguished and admirable when blade 4, be to flow into from blade inlet edge 401, the non-smooth surface 403 of flowing through then, perhaps vortex generator 404 through imitative cat owl flexuose trailing edge 405, flows out blade at last toward the trailing edge development.After this process, will reach the lift-rising drag reduction, raise the efficiency, reduce anti noise.

Claims

1. a blade is characterized in that, the leading edge of this blade is the whale fin-shaped, and the trailing edge of blade is cat owl feather flexuose, and the string face of blade is a non-smooth surface; Or on the smooth surface of string face, vortex generator is installed.

2. blade as claimed in claim 1 is characterized in that, on the described non-smooth surface vortex generator is installed.

3. blade as claimed in claim 1 or 2 is characterized in that, non-smooth surface is rib, spherical pit, hemisphere jut, triangular pyramidal pit, triangular pyramidal projection, polygonal frustum pit and polygonal frustum convex.