Stator blades and compressor

Abstract

A stator blade is provided, comprising an upper edge plate, a lower edge plate and a blade body, and also comprising an elastic membrane, a main ventilation hole and a ventilation branch hole, wherein the elastic membrane is arranged outside at least a part of the blade body; the main ventilation hole is arranged on the upper edge plate and / or the lower edge plate; the ventilation branch hole is arranged on the blade body and covered by the elastic membrane, and is fluidically connected with the ventilation main hole; wherein the ventilation branch hole is used to output the airflow input by at least a part of the ventilation main hole to change the shape of the elastic membrane. A compressor comprising the above-mentioned stator blade is also provided. The above-mentioned stator blade can flexibly adjust the aerodynamic shape of the stator blade so that the blade can better adapt to different working conditions.

Description

Technical Field

[0001] The utility model relates to the field of aviation engines, in particular to the field of stator blades. Background Art

[0002] The airflow conditions of aircraft engines change at any time depending on the working conditions, but the aerodynamic shape of the stator blades cannot adapt well to various working airflow conditions, so that existing aircraft engines cannot always be in the best working condition during operation. Utility Model Content

[0003] One object of the utility model is to provide a stator blade capable of adjusting the aerodynamic shape of the stator blade.

[0004] To achieve the above-mentioned purpose, the stator blade includes an upper edge plate, a lower edge plate and a blade body, and also includes an elastic membrane, a main ventilation hole, and a ventilation branch hole, wherein the elastic membrane is arranged on the outside of at least part of the blade body; the main ventilation hole is arranged on the upper edge plate and / or the lower edge plate; the ventilation branch hole is arranged on the blade body and covered by the elastic membrane, and is fluidically connected with the main ventilation hole; wherein the ventilation branch hole is used to output the airflow input by at least part of the main ventilation hole to change the shape of the elastic membrane.

[0005] In one or more embodiments, the stator blade further includes an airflow conveying channel located on the blade body, the airflow conveying channel includes an inlet and multiple outlets, the inlet is connected to one of the main ventilation holes, and the multiple outlets are respectively connected to multiple ventilation branch holes.

[0006] In one or more embodiments, the main ventilation hole and / or the branch ventilation hole is a cylindrical hole.

[0007] In one or more embodiments, a portion of the main ventilation holes is used to input airflow, and another portion of the main ventilation holes is used to output airflow, so as to keep the airflow in the space between the elastic membrane and the blade body stable.

[0008] In one or more embodiments, the elastic membrane covers the entire blade body and is sealingly connected to the upper edge plate and the lower edge plate.

[0009] In one or more embodiments, the main ventilation hole is arranged at the connection position between the upper edge plate and / or the lower edge plate and the blade body.

[0010] Another object of the utility model is to provide a compressor, which includes the above-mentioned stator blades.

[0011] The above-mentioned stator blades are covered on the surface of the blade body by an airtight elastic membrane. Gas with specific pressure distribution and flow distribution is introduced through the main ventilation holes and the ventilation branch holes, so that the elastic membrane changes shape, thereby changing the aerodynamic shape of the stator blade and making the flow area of ​​the blade variable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0013] Figure 1 It is a schematic diagram of the complete ring of stationary blades;

[0014] Figure 2 is a schematic diagram of a single stator blade;

[0015] Figure 3 is a schematic diagram of the main ventilation hole;

[0016] Figure 4 is a schematic diagram of the ventilatory branch;

[0017] Figure 5 is a cross-sectional view of a stator blade;

[0018] Figure 6 yes Figure 5 A partial enlarged view of the middle A;

[0019] Figure 7 This is the longitudinal section of the stationary blade when the elastic membrane covers the outside of the blade body;

[0020] Figure 8 yes Figure 7 The enlarged view of point B in the middle;

[0021] Fig. 9 is the cross-sectional view of the stationary blade after the elastic membrane is expanded;

[0022] Fig.10 yes Fig. 9 Enlarged view of point C in the middle;

[0023] Fig.11 It is the longitudinal section of the stationary blade after the elastic membrane expands;

[0024] Fig.12 yes Fig.11 Enlarged view at D. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0026] It should be noted that these and other subsequent drawings are only examples and are not drawn in proportion, and should not be used as a limitation on the actual scope of protection required by the present utility model.

[0027] In an aircraft engine, a number of stator blades 10 usually work in the form of a complete ring, and the space formed by the blade body 3 of two adjacent stator blades 10 together with the upper edge plate 1 and the lower edge plate 2 is an airflow channel. In the traditional design, the aerodynamic shape of the stator blade 10 is fixed, and it does not have the ability to change the aerodynamic shape with the change of airflow, so that the engine cannot always be in the best working state during operation. This contradiction can also cause damage to the aircraft engine, such as the surge problem of the aircraft engine compressor.

[0028] In non-design conditions, it is usually necessary to set a certain number of adjustable stator blades. By adjusting the adjustable stator blades, the flow area and flow rate of the flow channel are changed to change the relative airflow angle of the inlet of the next row of rotors, thereby ensuring the angle of attack of the rotor. In traditional designs, adjustable stator blades are required to match non-design conditions. However, the existence of adjustable stator blades requires a set of adjustable stator blade adjustment systems, which increases the complexity of the adjustment system and the risk of engine instability. In addition, the bulky adjustable stator blade adjustment system greatly increases the weight of the engine.

[0029] In order to solve the above problems, the utility model provides a stator blade, which can change the aerodynamic shape of the stator blade by means of a simple structure, so that the flow area of ​​the blade can be changed according to the working conditions.

[0030] Reference Figures 2 to 12 As shown, the stator blade 10 includes an upper edge plate 1, a lower edge plate 2 and a blade body 3, and also includes an elastic membrane 4, a main ventilation hole 5, and a ventilation branch hole 6. The elastic membrane 4 is arranged outside at least a part of the blade body 3 and is an airtight and elastic membrane. Figure 3 In the illustrated embodiment, the elastic membrane 4 covers the entire blade airfoil 3 and is sealingly connected to the upper edge plate 1 and the lower edge plate 2 .

[0031] The main ventilation holes 5 are arranged on the upper edge plate 1 and / or the lower edge plate 1, and are specifically arranged at the connection position between the upper edge plate and / or the lower edge plate and the blade body, such as Figure 3As shown, the setting position is consistent with the wing shape of the blade body. The main ventilation hole 5 serves as an inlet for inputting gas with a certain pressure and flow rate, for example, obtaining airflow from an air source. The ventilation branch hole 6 is arranged on the blade body 3 and covered by the elastic membrane 4, and is fluidically connected to the ventilation main hole 5. The ventilation branch hole 6 is used to output the airflow input by at least part of the ventilation main hole 5 to change the shape of the elastic membrane 4, thereby changing the aerodynamic shape of the stator blade 10.

[0032] exist Figures 5 to 8 In the illustrated embodiment, the main ventilation hole 5 and the ventilation branch hole 6 are connected through an airflow conveying channel 7 provided in the blade body. The airflow conveying channel 7 includes an inlet 71 and multiple outlets 72, the inlet 71 is connected to the main ventilation hole 5, and the multiple outlets 72 are respectively connected to the multiple ventilation branch holes 6, so as to achieve the effect of connecting the main ventilation hole 5 to the multiple ventilation branch holes 6.

[0033] In some embodiments, the main ventilation hole 5 and / or the ventilation branch hole 6 are cylindrical holes with a circular cross section. In other embodiments, the main ventilation hole 5 and / or the ventilation branch hole 6 may also have other shapes such as an ellipse in cross section.

[0034] When working, an airflow with a certain pressure and flow rate can be input into the main ventilation hole 5, and the airflow passes through the airflow conveying channel 7 and is output from the ventilation branch hole 6 to the space 8 between the elastic membrane 4 and the blade body 3, thereby changing the shape of the elastic membrane 4, and then changing the flow area of ​​the corresponding blade, reducing the flow rate. Fig. 9 As shown, the deformation of the elastic membrane 4 can cause the deformation of the blade's own shape, thereby changing the relative airflow angle of the inlet of the next row of rotor blades, so that the rotor blades work near the optimal angle of attack.

[0035] In some embodiments, a portion of the main ventilation holes 5 is used for inputting airflow, and another portion of the main ventilation holes 5 is used for outputting airflow, so that the airflow in the space 8 between the elastic membrane and the blade body remains stable. In other embodiments, all the main ventilation holes 5 may be used for gas inflow, so that a certain amount of gas with a specific pressure distribution is maintained between the stationary blade body 3 and the elastic membrane 4, thereby allowing the elastic membrane 4 to maintain a certain shape.

[0036] The above-mentioned stator blades change the shape of the elastic membrane 4 by inputting gas of a certain pressure and flow rate into the ventilation main hole 5, thereby changing the flow area of ​​the corresponding stage blades and reducing the flow rate, so as to change the relative airflow angle of the inlet of the next row of rotor blades, so that the rotor blades work near the optimal angle of attack, realize the matching of the compressor under non-design conditions, and ensure the performance of non-design conditions. The overall structure of the structure is simple, can effectively simplify the system, reduce the weight of the engine, and realize flexible control of the flow area of ​​the stator blades.

[0037] In combination with the introduction of the above-mentioned stator blades, a compressor including the above-mentioned stator blades is also provided, which has a variable flow area and can change the aerodynamic shape according to the working state of the engine, thereby realizing the matching of the compressor to the non-design working conditions of the engine and ensuring the performance of the non-design working conditions.

[0038] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0039] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A stator blade, comprising an upper edge plate, a lower edge plate and a blade body, characterized in that: Also includes: An elastic membrane, disposed outside at least a portion of the blade body; A main ventilation hole is arranged on the upper edge plate and / or the lower edge plate; A ventilation branch hole, arranged on the blade body and covered by the elastic membrane, and fluidically connected with the ventilation main hole; The ventilation branch holes are used to output the airflow input by at least part of the ventilation main holes, so as to change the shape of the elastic membrane.

2. The stator blade according to claim 1, characterized in that: The stator blade also includes an airflow conveying channel located on the blade body, and the airflow conveying channel includes an inlet and multiple outlets. The inlet is connected to a main ventilation hole, and the multiple outlets are respectively connected to multiple ventilation branch holes.

3. The stator blade according to claim 1, characterized in that: The main ventilation hole and / or the branch ventilation hole are cylindrical holes.

4. The stator blade according to claim 1, characterized in that: A portion of the main ventilation holes is used for inputting airflow, and another portion of the main ventilation holes is used for outputting airflow, so that the airflow in the space between the elastic membrane and the blade body remains stable.

5. The stator blade according to claim 1, characterized in that: The elastic membrane covers the entire blade body and is sealed with the upper edge plate and the lower edge plate.

6. The stator blade according to claim 1, characterized in that: The main ventilation holes are arranged at the connection positions of the upper edge plate and / or the lower edge plate and the blade body.

7. A compressor, characterized in that: Comprising the stator blade according to any one of claims 1 to 6.

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