阅读说明：本技术 一种适用于水平轴风力机的合成射流喷气式聚能罩 (Synthetic jet flow jet energy collecting cover suitable for horizontal shaft wind turbine ) 是由 李国文 朱建勇 王成军 张庆营 齐亚丹 李勇 于 2019-09-30 设计创作，主要内容包括：一种适用于水平轴风力机的合成射流喷气式聚能罩,包括罩体和空气射流动力盒,罩体迎风侧外表面周向均布若干空气射流动力盒；空气射流动力盒包括盒体、进气嘴、排气管、压电陶瓷片及振动膜片,盒体内部为空气射流动力腔；进气嘴位于迎风侧且一端与大气相通,另一端与空气射流动力腔相通；排气管位于背风侧且一端与空气射流动力腔相通,另一端与罩体内部相通；盒体进气孔内设有进气活门,盒体排气孔道内设有排气活门,空气射流动力腔内设有两片压电陶瓷片和两片振动膜片,两片振动膜片平行设置,进气嘴与排气管通过振动膜片间隙相连通,振动膜片两侧腔体空间互不导通；两片压电陶瓷片分别固设在两片振动膜片中心；压电陶瓷片与供电电源进行电连接。(A synthetic jet flow jet energy collecting cover suitable for a horizontal shaft wind turbine comprises a cover body and air jet flow power boxes, wherein a plurality of air jet flow power boxes are uniformly distributed on the outer surface of the windward side of the cover body in the circumferential direction; the air jet power box comprises a box body, an air inlet nozzle, an exhaust pipe, a piezoelectric ceramic piece and a vibrating diaphragm, wherein an air jet power cavity is formed inside the box body; the air inlet nozzle is positioned on the windward side, one end of the air inlet nozzle is communicated with the atmosphere, and the other end of the air inlet nozzle is communicated with the air jet power cavity; the exhaust pipe is positioned on the leeward side, one end of the exhaust pipe is communicated with the air jet power cavity, and the other end of the exhaust pipe is communicated with the interior of the cover body; an air inlet valve is arranged in an air inlet hole of the box body, an air outlet valve is arranged in an air outlet channel of the box body, two piezoelectric ceramic pieces and two vibrating diaphragms are arranged in the air jet power cavity, the two vibrating diaphragms are arranged in parallel, an air inlet nozzle is communicated with an air outlet pipe through a gap of the vibrating diaphragms, and cavity spaces on two sides of the vibrating diaphragms are not communicated with each other; the two piezoelectric ceramic pieces are respectively fixedly arranged at the centers of the two vibrating diaphragms; the piezoelectric ceramic piece is electrically connected with a power supply.)

1. A synthetic jet flow jet energy collecting cover suitable for a horizontal shaft wind turbine is characterized in that: the air jet power box is uniformly distributed and fixedly arranged on the outer surface of the windward side of the cover body along the circumferential direction; the air jet power box comprises a box body, an air inlet nozzle, an exhaust pipe, a first piezoelectric ceramic piece, a second piezoelectric ceramic piece, a first vibration diaphragm and a second vibration diaphragm; the air inlet nozzle is positioned on the windward side of the cover body and is of a cone-cylindrical structure, the large-diameter end of the air inlet nozzle is communicated with the atmosphere, the small-diameter end of the air inlet nozzle is communicated with an air inlet hole of the box body, and an air inlet valve is arranged in the air inlet hole of the box body; the exhaust pipe is positioned on the leeward side of the cover body, one end of the exhaust pipe is communicated with the exhaust hole of the box body, the other end of the exhaust pipe penetrates through the cover body in a sealing manner and is communicated with the interior of the cover body, and an exhaust valve is arranged in the exhaust hole of the box body; the inner space of the box body forms an air jet power cavity, the first vibrating diaphragm and the second vibrating diaphragm are symmetrically and fixedly arranged in the air jet power cavity, the first vibrating diaphragm is parallel to the second vibrating diaphragm, the cavity spaces on the two sides of the first vibrating diaphragm are not communicated with each other, and the cavity spaces on the two sides of the second vibrating diaphragm are not communicated with each other; the air inlet nozzle is communicated with the exhaust pipe through a gap space between the first vibrating diaphragm and the second vibrating diaphragm; the first piezoelectric ceramic piece is fixedly attached to the center of the first vibrating diaphragm, the second piezoelectric ceramic piece is fixedly attached to the center of the second vibrating diaphragm, and the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are arranged oppositely; the cover body is provided with a power supply, and the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are electrically connected with the power supply.

Technical Field

The invention belongs to the technical field of wind power generation, and particularly relates to a synthetic jet flow type energy-gathering cover suitable for a horizontal shaft wind turbine.

Background

At present, most of large wind generating sets running in a grid-connected mode are horizontal-axis wind generating sets, and horizontal-axis wind turbines generally work by means of tangential component force of lift force of blades on a rotating section and are commonly called lift force type wind turbines.

Although the lift force type wind turbine has the advantages of high tip speed ratio and high wind energy utilization rate, the lift force type wind turbine also has the defect of weak starting performance, the starting wind speed of the common lift force type wind turbine is over 5m/s, and the starting wind speed of the individual lift force type wind turbine is even up to 7m/s, so that the generated energy and the generating range of the wind turbine are reduced.

Therefore, in order to overcome the defect that the lifting force type wind turbine is weak in starting performance, technicians add an energy-gathering cover outside the traditional horizontal axis wind turbine, and can increase the wind speed through the energy-gathering cover, wherein the wind speed can be increased by about 1.5-2 times.

However, the conventional energy-gathering cover has a limitation, and when the front-back pressure difference of the impeller of the wind turbine reaches an upper limit value, the flow of the gas collected by the energy-gathering cover also reaches the upper limit value, so that the wind energy utilization rate of the wind turbine cannot be further improved.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the synthetic jet flow jet energy-collecting cover suitable for the horizontal axis wind turbine, which can generate the effects of accelerating airflow, disturbing the airflow on the boundary layer on the inner surface of the energy-collecting cover and increasing the airflow flow inside the energy-collecting cover, thereby effectively improving the wind energy utilization rate of the horizontal axis wind turbine.

In order to achieve the purpose, the invention adopts the following technical scheme: a synthetic jet flow jet energy collecting cover suitable for a horizontal shaft wind turbine comprises a cover body and a plurality of air jet flow power boxes, wherein the air jet flow power boxes are distributed in a plurality of numbers, and the air jet flow power boxes are uniformly distributed and fixedly arranged on the outer surface of the windward side of the cover body along the circumferential direction; the air jet power box comprises a box body, an air inlet nozzle, an exhaust pipe, a first piezoelectric ceramic piece, a second piezoelectric ceramic piece, a first vibration diaphragm and a second vibration diaphragm; the air inlet nozzle is positioned on the windward side of the cover body and is of a cone-cylindrical structure, the large-diameter end of the air inlet nozzle is communicated with the atmosphere, the small-diameter end of the air inlet nozzle is communicated with an air inlet hole of the box body, and an air inlet valve is arranged in the air inlet hole of the box body; the exhaust pipe is positioned on the leeward side of the cover body, one end of the exhaust pipe is communicated with the exhaust hole of the box body, the other end of the exhaust pipe penetrates through the cover body in a sealing manner and is communicated with the interior of the cover body, and an exhaust valve is arranged in the exhaust hole of the box body; the inner space of the box body forms an air jet power cavity, the first vibrating diaphragm and the second vibrating diaphragm are symmetrically and fixedly arranged in the air jet power cavity, the first vibrating diaphragm is parallel to the second vibrating diaphragm, the cavity spaces on the two sides of the first vibrating diaphragm are not communicated with each other, and the cavity spaces on the two sides of the second vibrating diaphragm are not communicated with each other; the air inlet nozzle is communicated with the exhaust pipe through a gap space between the first vibrating diaphragm and the second vibrating diaphragm; the first piezoelectric ceramic piece is fixedly attached to the center of the first vibrating diaphragm, the second piezoelectric ceramic piece is fixedly attached to the center of the second vibrating diaphragm, and the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are arranged oppositely; the cover body is provided with a power supply, and the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are electrically connected with the power supply.

The invention has the beneficial effects that:

the synthetic jet flow jet type energy-gathering cover suitable for the horizontal axis wind turbine can generate the effects of accelerating airflow, disturbing the airflow on the boundary layer on the inner surface of the energy-gathering cover and increasing the airflow flow inside the energy-gathering cover, thereby effectively improving the wind energy utilization rate of the horizontal axis wind turbine.

Drawings

FIG. 1 is a schematic structural diagram of a synthetic jet energy-collecting cover suitable for a horizontal axis wind turbine according to the present invention;

FIG. 2 is a schematic structural view of an air jet power cartridge (initial state) of the present invention;

FIG. 3 is a schematic diagram of the construction of the air jet power cartridge (intake state) of the present invention;

FIG. 4 is a schematic diagram of the construction of the air jet power cartridge (exhaust state) of the present invention;

in the figure, 1-cover body, 2-air jet power box, 3-box body, 4-air inlet nozzle, 5-exhaust pipe, 6-first piezoelectric ceramic piece, 7-second piezoelectric ceramic piece, 8-first vibration membrane, 9-second vibration membrane, 10-air inlet valve, 11-exhaust valve, 12-air jet power cavity, 13-wind machine.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1 to 4, the synthetic jet flow type energy-gathering cover suitable for the horizontal axis wind turbine comprises a cover body 1 and a plurality of air jet flow power boxes 2, wherein the number of the air jet flow power boxes 2 is a plurality, and the plurality of the air jet flow power boxes 2 are uniformly and fixedly arranged on the outer surface of the windward side of the cover body 1 along the circumferential direction; the air jet power box 2 comprises a box body 3, an air inlet nozzle 4, an exhaust pipe 5, a first piezoelectric ceramic piece 6, a second piezoelectric ceramic piece 7, a first vibration diaphragm 8 and a second vibration diaphragm 9; the air inlet nozzle 4 is positioned on the windward side of the cover body 1, the air inlet nozzle 4 is of a conical cylindrical structure, the large-diameter end of the air inlet nozzle 4 is communicated with the atmosphere, the small-diameter end of the air inlet nozzle 4 is communicated with an air inlet hole of the box body 3, and an air inlet valve 10 is arranged in the air inlet hole of the box body 3; the exhaust pipe 5 is positioned on the leeward side of the cover body 1, one end of the exhaust pipe 5 is communicated with the exhaust hole of the box body 3, the other end of the exhaust pipe 5 hermetically penetrates through the cover body 1 and is communicated with the interior of the cover body 1, and an exhaust valve 11 is arranged in the exhaust hole of the box body 3; the inner space of the box body 3 forms an air jet power cavity 12, the first vibrating diaphragm 8 and the second vibrating diaphragm 9 are symmetrically and fixedly arranged in the air jet power cavity 12, the first vibrating diaphragm 8 is parallel to the second vibrating diaphragm 9, the cavity spaces at two sides of the first vibrating diaphragm 8 are not communicated with each other, and the cavity spaces at two sides of the second vibrating diaphragm 9 are not communicated with each other; the air inlet nozzle 4 is communicated with the exhaust pipe 5 through a gap space between the first vibrating diaphragm 8 and the second vibrating diaphragm 9; the first piezoelectric ceramic piece 6 is fixedly attached to the center of the first vibrating diaphragm 8, the second piezoelectric ceramic piece 7 is fixedly attached to the center of the second vibrating diaphragm 9, and the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 are arranged oppositely; and a power supply is arranged on the cover body 1, and the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 are electrically connected with the power supply.

In the embodiment, the rotating diameter of the impeller of the wind turbine 13 is 300mm, the diameter of the windward side of the cover body 1 is 360mm, the diameter of the leeward side of the cover body 1 is 300mm, and the cover body 1 is made of an aluminum plate with the thickness of 0.2 mm.

With the start of the wind turbine 13, the flow capacity of the airflow inside the cover 1 will change with the rotation speed of the impeller of the wind turbine 13, and when the front pressure of the impeller of the wind turbine 13 reaches a balance, the flow rate of the airflow inside the cover 1 will not change, that is, the flow capacity of the airflow inside the cover 1 will reach an upper limit value. At this time, if the air jet power box 2 is not present, the wind energy utilization rate of the wind turbine 13 can reach a bottleneck only by the cover body 1.

Due to the existence of the air jet power box 2, when the power supply supplies power to the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7, the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 synchronously generate vibration, the vibration directions of the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 are opposite, and the first vibration diaphragm 8 and the second vibration diaphragm 9 are driven to synchronously vibrate.

In the vibration process of the first vibration diaphragm 8 and the second vibration diaphragm 9, when the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 move away from each other, the volume of a gap space between the first vibration diaphragm 8 and the second vibration diaphragm 9 is increased, so that the pressure in the gap space is reduced, at this time, the air inlet valve 10 is pushed open under the pressure difference, the air outlet valve 11 is in a closed state under the pressure difference, and air directly enters the gap space between the first vibration diaphragm 8 and the second vibration diaphragm 9 through the air inlet nozzle 4.

Next, with the continuous vibration of the first vibration diaphragm 8 and the second vibration diaphragm 9, the first piezoelectric ceramic piece 6 and the second piezoelectric ceramic piece 7 will move close to each other, so that the volume of the gap space between the first vibration diaphragm 8 and the second vibration diaphragm 9 is reduced, and the pressure in the gap space is increased, at this time, the air inlet valve 10 is in a closed state under the pressure difference, and meanwhile, the air outlet valve 11 is pushed open under the pressure difference, and the air in the gap space will be extruded into the air outlet pipe 5, and finally is injected into the cover body 1 through the air outlet pipe opening of the air outlet pipe 5, so that the airflow flow inside the energy-gathering cover is increased, an acceleration effect is generated on the airflow, and the boundary layer airflow on the inner surface of the energy-gathering cover is disturbed, so that the capability of the airflow is improved to do work, and finally the wind energy utilization.

Selecting a blade airfoil as a symmetrical airfoil NACA0018 by searching an airfoil handbook, manufacturing two groups of blades according to the selected airfoil, wherein the number of the blades in each group is four, the blades are all of a wood structure, the chord length of each blade is 30mm, and the span length of each blade is 135 mm; the first set of blades is fitted with a conventional configuration of the shaped charge shroud and the second set of blades is fitted with the shaped charge shroud of the present invention.

After the preparation work is finished, the wind turbine provided with the energy-gathering cover of the traditional structure is tested, then the wind turbine provided with the energy-gathering cover is tested, and under the condition that the external wind speed is the same, the wind energy utilization rate of the wind turbine provided with the energy-gathering cover is integrally improved by about 5%.