Guide stator and turbofan engine including the same

Abstract

The present invention discloses a guide stator and a turbofan engine including the same. The guide stator has a cavity, and the leading edge side and the trailing edge side of the guide stator are respectively provided with a leading edge opening and a trailing edge opening communicating with the cavity. The turbofan engine includes the above-mentioned guide stator. The present invention changes the structure of the guide stator and provides openings on the leading edge and the trailing edge sides of the guide stator to reduce the surface area of the guide stator, thereby reducing the effective area of the airflow wake of the fan rotor upstream of the guide stator, thereby reducing the intensity and probability of the trailing edge vortex of the fan rotor directly hitting the surface of the guide stator, thereby reducing the interference effect of the rotor and the stator. In addition, part of the airflow generated by the fan rotor can enter the inner cavity of the guide stator through the leading edge opening and then flow out through the trailing edge opening, further reducing the interference effect between the rotor and the stator, and effectively reducing the fan rotation-stator interference noise.

Description

Technical Field

[0001] The invention relates to a guide stator and a turbofan engine comprising the same. Background Art

[0002] For modern high-bypass turbofan engines, fan noise is the primary noise source during flight and landing. Fan noise consists of single-tone noise and broadband noise, with different components at subsonic and supersonic speeds. At subsonic speeds, the noise spectrum is characterized by the superposition of a single blade pass frequency tone and its harmonics within a broadband noise spectrum. At supersonic speeds, multiple single-tone noises emerge, primarily radiating from the engine fan inlet during takeoff. Broadband noise is caused by factors such as vortex shedding from the blade boundary layer and trailing edge, and atmospheric turbulence. Single-tone noise, on the other hand, is generated by the periodic interaction between the blades and the incoming flow, and is typically related to the blade pass frequency and its harmonics.

[0003] Fan rotor-stator interference is the primary cause of single-tone noise. This noise can be reduced by properly selecting the number of rotor and stator blades to meet a cutoff condition. Alternatively, the number of rotor and stator blades can be appropriately selected using the cutoff condition. Alternatively, increasing the rotor-stator spacing can reduce the unsteady load on the blade surface and minimize interference. However, all of these methods may alter the turbofan engine's internal structure, which is not only costly but may also negatively impact other aerodynamic properties of the turbofan engine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the above-mentioned method of reducing the fan rotation-static interference noise may lead to high modification costs of the turbofan engine and affect the aerodynamic performance of the engine, and provide a guide stator and a turbofan engine containing the same.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a guide stator. The guide stator has a cavity. The leading edge side and the trailing edge side of the guide stator are respectively provided with a leading edge opening and a trailing edge opening communicating with the cavity.

[0007] In this solution, by changing the structure of the guide stator, openings are set on the leading edge and trailing edge sides of the guide stator to reduce the surface area of the guide stator, so that the effective area of the airflow wake of the fan rotor upstream of the guide stator is smaller, thereby reducing the intensity and probability of the trailing edge vortex of the fan rotor directly hitting the surface of the guide stator, thereby reducing the interference effect of the rotor and stator, and part of the airflow generated by the fan rotor can enter the inner cavity of the guide stator through the leading edge opening, and then flow out from the trailing edge opening, further reducing the interference effect between the rotor and the stator, and can effectively reduce the fan rotation-static interference noise.

[0008] Preferably, the leading edge opening and / or the trailing edge opening extends from a blade root of the guide stator to a blade tip of the guide stator.

[0009] In this solution, the above-mentioned structural form is adopted to further reduce the surface area of the guide stator, thereby reducing the intensity and probability of the trailing edge vortex of the fan rotor directly hitting the surface of the guide stator.

[0010] Preferably, the guide stator has a windward surface and a leeward surface, the windward surface and the leeward surface are arc-shaped structures, and a plurality of through holes communicating with the cavity are provided on the windward surface and the leeward surface.

[0011] In this solution, the windward and leeward surfaces of the guide stator are designed with an arc-shaped structure. This allows a portion of the fan rotor's airflow wake to flow smoothly downstream along the arc surface, smoothing the airflow and reducing the noise generated by air impact. By providing through holes on the windward and leeward surfaces of the guide stator that connect to the cavity, some of the airflow passing through the through holes can eliminate some of the noise.

[0012] Preferably, a support plate is provided in the cavity, and two ends of the support plate are respectively connected to two side walls of the cavity.

[0013] In this solution, providing a support plate can enhance the strength of the guide stator.

[0014] Preferably, there are multiple support plates, and the multiple support plates are cross-arranged;

[0015] And / or, the support plate is provided with a through hole.

[0016] In this solution, the provision of multiple intersecting support plates not only enhances the strength of the guide stator but also reduces gas noise by allowing the airflow entering the guide stator's inner cavity to be attenuated multiple times by the intersecting support plates. Providing through-holes in the support plates increases gas flow damping, further attenuating noise.

[0017] Preferably, the periphery of the front edge opening is an arc-shaped surface.

[0018] In this solution, setting the periphery of the leading edge opening as an arc-shaped surface can reduce the resistance of gas flowing into the cavity and reduce gas noise.

[0019] Preferably, the periphery of the trailing edge opening is an arc-shaped surface.

[0020] In this solution, setting the periphery of the trailing edge opening as an arc-shaped surface can reduce the resistance of gas flowing out of the cavity and reduce gas noise.

[0021] Preferably, the guide stator includes a first panel and a second panel, the first panel and the second panel are arranged opposite to each other and surround the cavity, the first panel has a first surface, the second panel has a second surface, and the first surface and the second surface are respectively arranged as the windward side and the leeward side of the guide stator.

[0022] In this solution, the above structure is adopted, and the guide stator is composed of two panels, which is convenient for processing and transportation.

[0023] Preferably, the first panel and the second panel are spaced apart and form the leading edge opening and the trailing edge opening.

[0024] Preferably, the guide stator further includes a plurality of support plates, which are cross-arranged between the first panel and the second panel, and the support plates are provided with through holes.

[0025] In this solution, by providing multiple intersecting support plates between the two panels, the strength of the guide stator formed by the two panels is enhanced. The airflow entering the guide stator cavity is also attenuated multiple times by the multiple intersecting support plates, thereby reducing gas noise. Providing through-holes in the support plates increases gas flow damping, further attenuating noise.

[0026] The present invention also provides a turbofan engine, which includes the above-mentioned guide stator.

[0027] In this solution, a turbofan engine uses a guide stator containing the above-mentioned structure. By changing the structure of the guide stator and providing openings on the leading and trailing edge sides of the guide stator to reduce the surface area of the guide stator, the effective area of the airflow wake of the fan rotor upstream of the guide stator is made smaller, thereby reducing the intensity and probability of the trailing edge vortex of the fan rotor directly hitting the surface of the guide stator, thereby reducing the interference effect of the rotor and stator. In addition, part of the airflow generated by the fan rotor can enter the inner cavity of the guide stator through the leading edge opening and then flow out from the trailing edge opening, further reducing the interference effect between the rotor and stator, which can effectively reduce the fan rotation-stator interference noise, thereby reducing fan noise. A turbofan engine using the above-mentioned guide stator does not require changing the internal structure of the turbofan engine, does not increase the engine modification cost, and does not have a negative chain effect on other aerodynamic performance of the turbofan engine.

[0028] Preferably, the turbofan engine includes an outer duct arranged at the rear side of the fan, and the guide stator is arranged at the air inlet of the outer duct.

[0029] The positive progress of the present invention lies in that: by changing the structure of the guide stator and providing openings on the leading and trailing edges of the guide stator, the surface area of the guide stator is reduced, so that the effective area of the airflow wake of the fan rotor upstream of the guide stator is smaller, thereby reducing the intensity and probability of the trailing edge vortex of the fan rotor directly hitting the surface of the guide stator, thereby reducing the interference between the rotor and the stator. In addition, part of the airflow generated by the fan rotor can enter the inner cavity of the guide stator through the leading edge opening and then flow out from the trailing edge opening, further reducing the interference between the rotor and the stator, and effectively reducing the fan rotation-stator interference noise. A turbofan engine using the above-mentioned guide stator does not require changing the internal structure of the turbofan engine, does not increase the engine modification cost, and does not have a negative chain effect on other aerodynamic performance of the turbofan engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the internal partial structure of a turbofan engine in the prior art.

[0031] Figure 2 Schematic diagram of the structure of the guide stator in a preferred embodiment of the present invention.

[0032] Figure 3 1 is a top view of the guide stator in a preferred embodiment of the present invention.

[0033] Figure 4 Schematic diagram of the structure of the first panel of the guide stator in a preferred embodiment of the present invention.

[0034] Figure 5 Schematic diagram of the structure of the second panel of the guide stator in a preferred embodiment of the present invention.

[0035] Description of reference numerals:

[0036] Fan 100

[0037] Guide stator 200

[0038] First panel 210

[0039] Second panel 220

[0040] Cavity 230

[0041] Leading edge opening 240

[0042] Trailing edge opening 250

[0043] Support plate 260

[0044] First through hole 201

[0045] Second through hole 261

[0046] Bypass 300

[0047] Neihandao 400

[0048] Boost level 500 DETAILED DESCRIPTION

[0049] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0050] like Figure 1 As shown, this embodiment discloses a turbofan engine comprising a fan 100, a guide stator 200, an outer duct 300, an inner duct 400, and a supercharging stage 500. The following description of this embodiment uses a turbofan engine as an example. Those skilled in the art will readily appreciate that a turbofan engine typically also includes an air inlet, a compressor, a combustion chamber, a turbine, and other structures, none of which are shown in the figure. The fan 100 is located behind the air inlet. The inner duct 400 and the outer duct 300 are located behind the fan 100, meaning that the fan 100 is located between the air inlets of the inner duct 400 and the outer duct 300. The compressor is located behind the air outlet of the inner duct 400, so that airflow entering the inner duct 400 flows into the compressor. The outer duct 300 is arranged around the outer periphery of the inner duct 400, and the guide stator 200 is located within the outer duct 300.

[0051] like Figure 2-5As shown, a guide stator 200 of this embodiment has a cavity 230. A leading edge opening 240 and a trailing edge opening 250 are provided on the leading and trailing edge sides of the guide stator 200, respectively, communicating with the cavity 230. By changing the structure of the guide stator 200 and providing openings on the leading and trailing edge sides of the guide stator 200, the surface area of the guide stator 200 is reduced, thereby reducing the effective area of the airflow wake of the fan 100 rotor upstream of the guide stator 200. This reduces the intensity and probability of the trailing edge vortex shedding of the fan 100 rotor directly hitting the surface of the guide stator 200, thereby reducing the interference between the rotor and the stator. Furthermore, part of the airflow generated by the fan 100 rotor can enter the inner cavity of the guide stator 200 through the leading edge opening 240 and then flow out through the trailing edge opening 250, further reducing the interference between the rotor and the stator, and effectively reducing the rotation-stator interference noise of the fan 100.

[0052] In this embodiment, if Figure 2-5 As shown, the guide stator 200 includes a first panel 210 and a second panel 220. The first panel 210 and the second panel 220 are arranged opposite each other and enclose a cavity 230. The first panel 210 has a first surface, and the second panel 220 has a second surface. The first surface and the second surface are respectively configured as the windward side and the leeward side of the guide stator 200. The guide stator 200 is assembled from two panels for easy processing and transportation.

[0053] In this embodiment, if Figure 2 As shown, the first panel 210 and the second panel 220 are spaced apart and form a leading edge opening 240 and a trailing edge opening 250. The leading edge opening 240 and the trailing edge opening 250 extend from the blade root of the guide stator 200 to the blade tip of the guide stator 200. This structure further reduces the surface area of the guide stator 200, thereby reducing the intensity and probability of the trailing edge vortex shedding from the fan 100 rotor directly hitting the surface of the guide stator 200.

[0054] In some embodiments, the guide stator 200 may also be an integral prefabricated structure. The sizes of the leading edge opening 240 and the trailing edge opening 250 are adjusted according to the aerodynamic layout design and are not limited here.

[0055] The guide stator 200 has a windward surface and a leeward surface. The windward surface and the leeward surface are arc-shaped structures. A plurality of through holes communicating with the cavity 230 are provided on the windward surface and the leeward surface.

[0056] In this embodiment, the windward side is the outer side of the second panel 220, and the leeward side is the outer side of the first panel 210. Figure 4 and Figure 5As shown, first through holes 201 are provided on the first panel 210 and the second panel 220, which pass through the outer and inner sides of the panel body. The first through holes 201 are distributed throughout the first panel 210 and the second panel 220. The aperture of the first through holes 201 should not be too large, otherwise it will affect the sound insulation effect.

[0057] The curved design of the windward and leeward surfaces of the guide stator 200 allows a portion of the airflow wake from the fan 100 rotor to flow smoothly downstream along the curved surface, smoothing the airflow and reducing noise generated by air impact. By providing through-holes on the windward and leeward surfaces of the guide stator 200 that communicate with the cavity 230, some noise can be eliminated as the airflow passes through the through-holes.

[0058] A support plate 260 is also provided in the cavity 230 of the guide stator 200, and the two ends of the support plate 260 are respectively connected to the two side walls of the cavity 230. The provision of the support plate 260 can enhance the strength of the guide stator 200. There are multiple support plates 260, and the multiple support plates 260 are cross-arranged. In some embodiments, the support plate 260 is further provided with a through hole. By providing multiple cross-support plates 260, not only can the strength of the guide stator 200 be enhanced, but the airflow entering the inner cavity of the guide stator 200 can also be attenuated multiple times by the multiple cross-distributed support plates 260, thereby reducing gas noise. Providing through holes on the support plate 260 can increase the gas flow damping and further attenuate noise.

[0059] like Figure 2 and Figure 3 As shown, in this embodiment, multiple support plates 260 are disposed between the first panel 210 and the second panel 220. These support plates 260 are arranged crosswise, and each support plate 260 is provided with a second through hole 261. Since the guide stator 200 of this embodiment is composed of two panels, the provision of multiple cross-shaped support plates 260 between the two panels not only connects the two panels to form a complete guide stator 200 and enhances the strength of the guide stator 200 composed of two panels, but also allows the airflow entering the inner cavity of the guide stator 200 to be multiple-attenuated by the multiple cross-shaped support plates 260, thereby reducing gas noise. The second through holes 261 provided in the support plates 260 increase gas flow damping, further attenuating noise.

[0060] In some embodiments, the periphery of the leading edge opening 240 is an arc-shaped surface. Setting the periphery of the leading edge opening 240 as an arc-shaped surface can reduce the resistance of the gas flowing into the cavity 230 and reduce the gas noise.

[0061] In some embodiments, the periphery of the trailing edge opening 250 is an arc-shaped surface. Setting the periphery of the trailing edge opening 250 as an arc-shaped surface can reduce the resistance of the gas flowing out of the cavity 230 and reduce the gas noise.

[0062] like Figure 2-5 As shown, in this embodiment, the side surfaces of the first panel 210 and the second panel 220 located on the front edge are curved surfaces, and the first panel 210 and the second panel 220 are connected to the outer side surface and the inner side surface of the panel by the curved surface. This structure ensures that the periphery of the front edge opening 240 formed after the first panel 210 and the second panel 220 are assembled is a curved surface.

[0063] The present invention further provides a turbofan engine, which includes the above-mentioned guide stator 200 , and the guide stator 200 is arranged at the air inlet of the outer duct 300 .

[0064] The turbofan engine adopts a guide stator 200 with the above-mentioned structure. Different from the conventional method of increasing the distance between the rotor and the stator, without affecting the structure and weight performance of the fan 100, by changing the structure of the guide stator 200, openings are set on the leading edge and trailing edge sides of the guide stator 200 to reduce the surface area of the guide stator 200, so that the effective area of the airflow wake of the fan 100 rotor upstream of the guide stator 200 is smaller, thereby reducing the intensity and probability of the trailing edge vortex of the fan 100 rotor directly hitting the surface of the guide stator 200, thereby reducing the interference effect of the rotor and the stator; and part of the airflow generated by the fan 100 rotor can enter the inner cavity of the guide stator 200 through the leading edge opening 240, and then flow out from the trailing edge opening 250, further reducing the interference effect between the rotor and the stator, which can effectively reduce the rotation-stator interference noise of the fan 100, thereby reducing the noise of the fan 100. A turbofan engine using the above-mentioned guide stator 200 does not require changing the internal structure of the turbofan engine, will not increase the modification cost of the engine, and will not produce adverse chain effects on other aerodynamic performances of the turbofan engine.

[0065] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A guide stator, characterized in that: The guide stator has a cavity, and the leading edge side and the trailing edge side of the guide stator are respectively provided with a leading edge opening and a trailing edge opening communicating with the cavity; A support plate is provided in the cavity, and two ends of the support plate are respectively connected to two side walls of the cavity; There are multiple support plates, and the multiple support plates are cross-arranged; And / or, the support plate is provided with a through hole.

2. The guide stator according to claim 1, characterized in that: The leading edge opening and / or the trailing edge opening extends from a blade root of the guide stator to a blade tip of the guide stator.

3. The guide stator according to claim 1, characterized in that: The guide stator has a windward surface and a leeward surface, the windward surface and the leeward surface are arc-shaped structures, and a plurality of through holes communicating with the cavity are provided on both the windward surface and the leeward surface.

4. The guide stator according to claim 1, characterized in that: The periphery of the front edge opening is an arc-shaped surface.

5. The guide stator according to claim 1, characterized in that: The periphery of the trailing edge opening is an arc-shaped surface.

6. The guide stator according to claim 1, characterized in that: The guide stator includes a first panel and a second panel, the first panel and the second panel are arranged opposite to each other and surround the cavity, the first panel has a first surface, the second panel has a second surface, and the first surface and the second surface are respectively arranged as the windward side and the leeward side of the guide stator.

7. The guide stator according to claim 6, characterized in that: The first panel and the second panel are spaced apart and form the leading edge opening and the trailing edge opening.

8. The guide stator according to claim 6, characterized in that: The guide stator further includes a plurality of support plates, which are cross-arranged between the first panel and the second panel, and the support plates are provided with through holes.

9. A turbofan engine, characterized in that: The turbofan engine includes the guide stator according to any one of claims 1 to 8.

10. The turbofan engine according to claim 9, characterized in that: The turbofan engine includes an outer duct arranged at the rear side of the fan, and the guide stator is arranged at the air inlet of the outer duct.

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