CN114658491B

CN114658491B - Rim-driven Taiji vortex fan blade and application

Info

Publication number: CN114658491B
Application number: CN202210279300.2A
Authority: CN
Inventors: 段力; 刘军; 曾加刚
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2023-08-11
Anticipated expiration: 2042-03-21
Also published as: CN114658491A

Abstract

The invention provides a rim-driven Taiji vortex fan blade, which comprises: the device comprises a Taiji blade, wherein one end of the Taiji blade is provided with a pair of large semicircles facing opposite directions, and the two large semicircles are kept tangent; the other end of the device is provided with a pair of small semicircles with opposite directions, and each small semicircle corresponds to one large semicircle and is kept concentric with the large semicircle; the corresponding large semicircle is connected with the small semicircle to form two blade sectors; the two blade sectors are connected and are in a centrosymmetric S shape. According to the invention, the inclination angle and the form of the fan in the prior art are adjusted to form the Taiji blade, and each design parameter of the Taiji blade is optimized, so that the optimal value of the air suction flow can be obtained.

Description

Rim-driven Taiji vortex fan blade and application

Technical Field

The invention relates to the technical field of electric aero-engine propellers and electric aero-turbofan jet engines, in particular to a rim-driven Taiji turbofan blade and application thereof.

Background

Unlike conventional shaft driven turbine blades (turbofan aero-engines, electric fans, propellers), rim driven blades are not fixed on a central shaft but embedded in the inner edge of a rotating ring. The inner rotor blade for submarines is only suitable for hydraulic movement, and hydraulic pushing is different from aerodynamic force of an air fan (such as water specific gravity is much higher than that of air, and rotating speed is much lower); the blades for the outer propeller are again different from the fan blades (one for high thrust, one for high suction); shaft-driven turbofans (electric fans, turbofans of commercial aircraft engines) are shaft-driven, and have been shaped as fixed.

Through searching, the rim-driven ducted propeller for aviation with the publication number of CN202110409166.9 is internally provided with a driving fan; rim driven semi-submersible, also a built-in drive fan, publication CN 202111102339.9. It can be seen that rim driven blade morphology design is a technical gap and existing rim driven blade morphologies fail to form the optimum value of suction flow.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a rim-driven Taiji turbine blade and application thereof.

According to one aspect of the present invention, there is provided a rim driven tai chi scroll blade comprising:

the device comprises a Taiji blade, wherein one end of the Taiji blade is provided with a pair of large semicircles facing opposite directions, and the two large semicircles are kept tangent; the other end of the device is provided with a pair of small semicircles with opposite directions, and each small semicircle corresponds to one large semicircle and is kept concentric with the large semicircle; the corresponding large semicircle is connected with the small semicircle to form two blade sectors; the two blade sectors are connected and are in a centrosymmetric S shape; one end of the blade sector provided with the large semicircle is called a windward surface, and one end provided with the small semicircle is called a gas outlet surface; and the projections of the endpoints of the large semicircle and the small semicircle on the windward surface or the air outlet surface are positioned on the same straight line.

Preferably, the inclination angle between the Taiji blade and the plane in which the four endpoints of the major semicircle and the minor semicircle of the blade sector are located is alpha; the inclination angle alpha is between 10 and 45 degrees.

Preferably, the inclination angle α satisfies the relation:

wherein h is the height of the Taiji blade, D is the distance between the two ends of the outermost sides of the two large semicircles, and r is half of the distance between the two ends of the small semicircles.

Preferably, the major semicircle and the minor semicircle are ellipses; the major diameter of the ellipse is between 0 and D/2; the height h of the Tai Chi blade is between D/100 and D/2.

Preferably, both sides of the Taiji blade are flared outwards to form a connecting piece for embedding the rotating inner ring.

Preferably, the Tai Ji blade is repeated along the circle center, and the number of the repeated times is not more than 7.

According to a second aspect of the present invention there is provided the use of rim driven tai chi turbofan blades comprising three sets of rim driven tai chi turbofan blades arranged in a row and maintained facing the same.

Preferably, the wheel rims at the middle layer drive the Taiji turbofan blades as references, and the angles of the wheel rims at the upper layer and the lower layer drive the Taiji turbofan blades to rotate 60 degrees in the forward and the backward directions respectively.

Preferably, the three sets of rim driven Taiji turbine blades are spaced between D/100 and D.

Preferably, the tail pipe also comprises a tail pipe, wherein one end of the tail pipe is an air inlet, and the other end of the tail pipe is an air outlet; the area of the air outlet is between one twentieth and one half of the area of the air inlet;

the diameter of the tail spray pipe is gradually reduced, and the tail spray pipe is retracted towards the center to form a center tail spray nozzle;

or alternatively, the first and second heat exchangers may be,

the tail jet pipe comprises a conical inner wall and a supporting frame, wherein the conical inner wall is connected with the outer wall at the tail part by the supporting frame, and tail jet flows shrink into a tail jet ring along the conical inner wall.

Compared with the prior art, the invention has the following beneficial effects:

according to the rim-driven Taiji vortex fan blade provided by the embodiment of the invention, the inclination angle and the form of the fan in the prior art are adjusted to form the Taiji blade, each design parameter of the Taiji blade is optimized, and the optimal value of the air suction flow can be obtained.

The invention provides an application of a rim-driven Tai Ji turbofan blade, which is provided with three layers of Tai Ji blades, wherein when the Tai Ji turbofan blade rotates, the fan surface of the Tai Ji blade sucks head-on airflow, the airflow speed of a front stage and the optimal diversion relay of a guide multiple rear stage blade further accelerate pushing air through rotating force, and the air is transmitted to a next stage blade to enter a duct and be ejected at a high speed by a tail spray ring to generate optimal pushing force.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of a rim driven Taiji turbofan blade according to an embodiment of the present invention;

FIG. 2 is a plan view of a rim driven Taiji turbofan blade in accordance with one embodiment of the present invention;

FIG. 3 is a perspective view of a rim driven Taiji turbofan blade in accordance with one embodiment of the present invention;

FIG. 4 is a parametric representation of rim driven Taiji turbine blades in accordance with one embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating an application of a rim driven Taiji turbine blade in accordance with an embodiment of the present invention; wherein 5 (a) is an exemplary diagram of a tail nozzle with a tail nozzle as a central tail nozzle; 5 (b) is an exemplary diagram of a tail nozzle as a tail nozzle ring;

fig. 6 is a schematic plan view of three sets of tai chi blades of the embodiment corresponding to fig. 5.

In the figure: 1 is a Taiji blade, 2 is a blade sector, 201 is a large semicircle, 202 is a small semicircle, 3 is a connecting piece, 4-outer wall embeds a protruding end, 5-tail nozzle and 51-center tail nozzle 51, 52-tail nozzle ring 52.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

The invention integrates the Chinese Taiji diagram concept and thought into the rim driving blade, and the invention not only comprises the shape and the emphasis on the shape. The 'spirit' refers to the Taiji generation two instruments, namely, the leaves are in double pairs and cannot exist independently; the second is the idea of round, the outline of the blade is round everywhere, and the idea of the blade force She Shan and blade profile of the aero-engine is that the blade, the page, the wall, the tail spray hole, the tail spray ring and the curved surface of the duct are round, which is the through meaning of the design idea of the Taiji blade 'god'.

Based on the above inventive concept, in an embodiment of the present invention, a rim driven tai chi fan blade has a structure as shown in fig. 1 and 2, including: the Taiji blade 1, the Taiji blade 1 includes two blade sectors 2, and the blade sector 2 links to each other and takes the S type. Wherein one end of the blade sector 2 is a large semicircle 201 and the other end is a small semicircle 202. The large semicircle 201 of the two blade sectors 2 is on the same side. A streamline line connection is used between the large semicircle 201 and the small semicircle 202. The two blade sectors 2 are connected to each other. The end of the blade sector provided with a large semicircle is called a windward side, and the end provided with a small semicircle is called an air outlet side.

In order to obtain an optimal value of the suction flow, the present invention provides a preferred embodiment, referring to fig. 3 and 4, the tai chi blade 1 is at a certain inclination angle alpha to the plane (i.e. the windward side). The inclination angle alpha in this embodiment is between 10 deg. -45 deg.. The relation between the inclination angle and the inner diameter and the outer diameter of the big semicircle is as follows:

further, the major and minor semicircles are ellipses having a major diameter between 0 and half the radius of the entire major circle (D/2). The height h of the Tai Ji blade 1 is between D/100 and D/2, and the thickness D of the Tai Ji blade is between D/1000 and D/10. The parameter design enables the adjustment of the windward angle alpha to generate the optimal air suction force, and besides, parameters such as the curved surface shape, the distortion degree and the like of the She Shan blade profile are also adjusted.

To further optimize the optimum value of the suction flow, in other embodiments of the invention, the Tai Chi blade is repeated along the center of the circle no more than 7 times.

In other embodiments of the invention, the two sides of the Taiji blade 1 are outwards expanded to obtain the connecting piece 3, and the connecting piece 3 is embedded on the rotating inner ring driven by the rim.

According to the same conception, the invention provides an embodiment, namely, the application of rim-driven Taiji vortex blade, as shown in fig. 5, adopts three-stage combined Taiji blade, namely, two more blades are added above and below the blade mentioned in the embodiment, and the shape is the same, and the upper and lower surfaces are the same.

Further, in order to obtain the optimum air flow, the angles of the upper and lower blades are each rotated by 60 ° in the clockwise and counterclockwise directions. Three Tai Ji leaf blades are simultaneously embedded in the inner ring to form a pattern of three leaf suction flow relay, as shown in figure 6.

In the three-set blade designs above, the edge design is different, see FIG. 5. The outer edges of the three groups of blades are provided with a cylindrical wall surface with the thickness of 1mm-10mm, two or more (not more than 7 pairs) of connecting pieces 3 (outer wall embedded protruding ends 4) embedded in the rotating inner ring are bulged outside the wall surface, and the edges of the three groups of blades are embedded in the cylindrical wall surface to form a three-group Taiji blade structure which is wrapped by the inner wall of the cylinder and has fixed edges. The whole structure comprises the embedded protruding end which is formed by 3D printing or casting at one time, and the welding process is not required to be connected.

Furthermore, the space between the three groups of blades is used for establishing the optimal ducted airflow relay effect through CFD simulation software, the space between the three groups of blades is between D/100 and D, and the number and the space between the three groups of Taiji blades are used for the optimal technical effect. The latter stage blade relays the air flow pushed by the former stage blade, the air flow follows the best flow guiding effect, and the ducted air flow is further pushed to the next stage blade through rotational flow acceleration. The three stages of relay suction airflows form the maximum air suction force.

In other embodiments of the present invention, the tail pipe 5 further comprises an air inlet at one end and an air outlet at the other end; the area of the air outlet is between one twentieth and one half of the area of the air inlet. The design of the tail pipe includes, but is not limited to, two types. First, as shown in FIG. 5 (a), the diameter of the nozzle is gradually reduced, and the nozzle is retracted toward the center to form a center nozzle 51; the second type, as shown in fig. 5 (b), includes a conical inner wall and a supporting frame, the conical inner wall is connected with the outer wall at the tail by the supporting frame to form a tail spray ring 52, and the tail spray flows out in a ring shape along the conical inner wall to the tail spray ring 52. The whole tail nozzle or the tail nozzle ring structure comprises a support frame which is formed by 3D printing or casting at one time, and a welding process is not required to be connected. The first tail nozzle is simple in structure and does not need accessories such as a tail support frame; the second type of jet nozzle has the advantage of being well-structured, being a standard cylinder, and allowing the use of the free space of the cylinder for the placement of mobile power supplies, batteries, etc.

According to the same conception, in other implementations of the invention, a method of manufacturing rim driven tai chi turbofan blades is provided, which is integrated or assembled using 3D printing, casting or molding.

The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention. The above-described preferred features may be used in any combination without collision.

Claims

1. Rim driven taiji vortex fan blade, characterized in that it comprises:

2. The rim driven tai chi turbofan blade of claim 1, wherein the angle of inclination between the tai chi blade and a plane in which the four endpoints of the major and minor semicircles of the blade sector lie is α; the inclination angle alpha is between 10 and 45 degrees.

3. Rim driven tai chi turbofan blade according to claim 2, wherein the pitch angle α satisfies the relation:

wherein h is the height of the Taiji blade, D is the distance between two endpoints at the outermost sides of the two large semicircles, and r is half of the distance between two ends of the small semicircles.

4. A rim driven tai chi turbofan blade according to claim 3, wherein the major and minor semicircles are ellipses; the long diameter of the ellipse is between 0 and D/2, and the short diameter of the ellipse is D/4; the height h of the Tai Chi blade is between D/100 and D/2.

5. The rim driven tai chi turbofan blade of claim 1, wherein both sides of the tai chi blade flare outwardly forming a connection for embedding a rotating inner ring.

6. Rim driven tai chi turbofan blade according to any one of the claims 1-5, wherein the tai chi blade is repeated around its own centre point no more than 7 times.

7. The application of the rim-driven Taiji vortex blade is characterized by comprising three groups of rim-driven Taiji vortex blades which are arranged in a row and keep the same orientation.

8. The use of rim driven tai chi scroll fan blades as defined in claim 7, wherein the rim driven tai chi scroll fan blades in the upper and lower layers are rotated by 60 ° in the forward and reverse directions, respectively, with reference to the rim driven tai chi scroll fan blades in the middle layer.

9. Use of rim driven tai chi scroll blades according to any one of the claims 7-8, wherein three sets of rim driven tai chi scroll blades have a pitch between D/100 and D.

10. The use of rim driven taiji turbine blades of claim 9, further comprising a tail nozzle having an air inlet at one end and an air outlet at the other end; the area of the air outlet is between one twentieth and one half of the area of the air inlet;

the diameter of the tail jet pipe is gradually reduced, the tail jet pipe is retracted towards the center to form a center tail nozzle, and tail jet flows are concentrated to the center tail nozzle along the tail jet pipe to be jetted out;

or alternatively, the first and second heat exchangers may be,

the tail jet pipe comprises a conical inner wall and a supporting frame, the tail of the conical inner wall is connected with the outer wall through the supporting frame to form a tail jet ring, and tail jet flows are ejected out in an annular mode from the conical inner wall to the tail jet ring.