Air inlet device of gas turbine

Abstract

The invention relates to the technical field of aviation or civil auxiliary power devices / starters, in particular to an air inlet device of a gas turbine. In the prior art, in the flow control process of a load section, when an inlet guide vane is closed to the minimum, the flow of an air compressor of the load section cannot be 0, otherwise, the air compressor chatters, and the air compressor is damaged when the chatter is serious, however, due to the structural clearance fit characteristic of the engine, when a load air inlet grille or a grid channel is completely closed, the flow of the air compressor cannot be 0. In addition, air in the load air compressor can flow in from the gaps of the grating, the air compressor does not have flow at all, and the possible chatter problem of the load air compressor is successfully avoided. According to the air compressor, under the non-design working condition, inlet air flow in a grid form is more uniform in the circumferential direction, and the problem that blades vibrate due to the fact that separation exists on the guide blades of a traditional air compressor with the guide blades can generate non-uniform circumferential excitation sources is solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of aviation or civil auxiliary power units / starters, and in particular to an air intake device of a gas turbine. Background Art

[0002] The auxiliary power unit with double-sided opposite air intake has only one centrifugal compressor on one side, called the load compressor, which is mainly responsible for bleed air and power generation, and a conventional turbine engine on the other side, called the power section, which is responsible for output power. When the aircraft does not need bleed air and power generation, the load section can be idle. At this time, the conventional load section compressor closes the load section intake channel by adjusting the radial or axial inlet guide vane angle set at the front end of the load compressor, making the load compressor inlet flow close to zero. At this time, the load compressor does not consume the power output by the power section, so the power section can output more power for the aircraft to use.

[0003] The existing load compressor flow axial or radial control device usually controls the movement of the connecting rod connected to the guide vane through a hydraulic actuator, thereby driving the axial or radial guide vane to rotate, so as to achieve the purpose of controlling the load compressor flow. Due to the inherent characteristics of the structure, the guide vane angle adjustment accuracy is not high. Since the force of the actuator undergoes multiple conversions, and there are often dozens of axial or radial guide vanes, it is very easy to cause inconsistent guide vane angle rotation or guide vane non-following during the adjustment process, resulting in control failure. In addition, since the guide vane is in the mainstream, the blade thickness is often thin. As a thin cantilever mechanism, the guide vane is very likely to break under long-term high-speed airflow and foreign object impact. Furthermore, due to the inevitable separation of the blade surface, it will cause circumferential unevenness of the airflow, causing circumferential disturbance to the impeller and causing vibration problems. Summary of the invention

[0004] In view of the above problems, the present disclosure provides an air intake device for a gas turbine.

[0005] An air intake device for a gas turbine, comprising an air intake device,

[0006] The air intake device includes a load section where a centrifugal compressor is arranged and a power section where a turbine engine is arranged; the load section is used for air intake and power generation; the power section is used for output power;

[0007] The load section and the power section have separate air intakes; the air intake adopts a push-pull flow control structure;

[0008] When air bleed and power generation are not required, the load section stops working, and the load section air inlet channel is closed by adjusting the flow control structure.

[0009] Furthermore, the push-pull flow control structure includes a fence or a grille.

[0010] Furthermore, the fence of the fence-type load section is fixed, and the fence of the power section is arranged to be spaced and crossed with the load section.

[0011] Furthermore, the power section fence is provided with at least two layers.

[0012] Furthermore, the power section fence is provided with two layers.

[0013] Furthermore, the upper layer of the power section fence can slide left and right, and balls or rollers are arranged between the two layers of fences or grilles.

[0014] Furthermore, the flow control structure is controlled hydraulically.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The disclosed structure is simple, does not require a complex mechanism such as guide vane adjustment, and only requires an axial actuation device;

[0017] Since the strength of the air intake grille can meet the use requirements, the fence of the present disclosure can also be made as thin as the air intake grille, which greatly reduces the overall mass and can take into account the function of the air intake grille;

[0018] The present disclosure can be coupled with the air intake grille design to reduce the total number of parts;

[0019] The present invention adopts hydraulic or other motion control structures for direct control, and the motion of the control mechanism presents a simple linear relationship with the motion law of the fence, with high control accuracy and low control failure;

[0020] Theoretically, the thickness of the fence (along the flow direction) is not limited, there will be no strength problem, and it has a stronger ability to resist damage from foreign objects;

[0021] The structure of the air intake grille disclosed herein determines that it can also play a certain role in preventing foreign objects from being sucked in;

[0022] In the prior art, during the load section flow control process, when the inlet guide vane is closed to the minimum, the compressor flow in the load section cannot be reduced to 0, otherwise the compressor will flutter, and in severe cases, it will cause damage to the compressor. However, due to the clearance fit characteristics of the structure of the engine itself, when the load air intake grille or grid channel is completely closed, air can flow into the load compressor through the gap of the grille, and the compressor will not be completely without flow, thus successfully avoiding the possible flutter problem of the load compressor.

[0023] In the present invention, under non-design conditions, the intake airflow in the form of a grille is more uniform in the circumferential direction, while the traditional compressor with guide vanes will produce uneven circumferential excitation sources due to separation on the guide vanes, causing vibration problems on the blades.

[0024] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 an auxiliary power unit air intake duct for dual-side object intake for the disclosed embodiment load;

[0027] Figure 2 Schematic diagram of fully open, half-open and fully closed gate-type channels in the embodiment of the present disclosure Figure 1 ;

[0028] Figure 3 Schematic diagram of the fully open, half-open and fully closed grille channel in the embodiment of the present disclosure Figure 2 ;

[0029] Figure 4 This is a three-dimensional schematic diagram of a fully open state of a fence-type channel according to an embodiment of the present disclosure;

[0030] Figure 5 This is a three-dimensional schematic diagram of a fence-type passage in a half-open state according to an embodiment of the present disclosure;

[0031] Figure 6 It is a three-dimensional schematic diagram of the fully closed state of the fence-type passage according to the embodiment of the present disclosure;

[0032] Figure 7 This is a three-dimensional schematic diagram of the fully open state of the grille-type channel in the embodiment of the present disclosure;

[0033] Figure 8 This is a three-dimensional schematic diagram of a grille-type channel in a half-open state according to an embodiment of the present disclosure;

[0034] Fig. 9 It is a three-dimensional schematic diagram of the fully closed state of the grille-type channel in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] In the field of aircraft engines, an auxiliary power unit with dual-sided opposite air intake has only one centrifugal compressor on one side, called the load compressor, which is mainly responsible for air bleed and power generation, and a conventional turbine engine on the other side, called the power section, which is responsible for output power. When the aircraft does not need air bleed and power generation, the load section can be idle. At this time, the conventional load section compressor closes the load section air intake channel by adjusting the radial or axial inlet guide vane angle set at the front end of the load compressor, making the load compressor inlet flow close to zero. At this time, the load compressor does not consume the power output by the power section, so the power section can output more power for the aircraft to use.

[0037] In the prior art, the existing load compressor flow axial or radial control device usually controls the movement of the connecting rod connected to the guide vane through a hydraulic actuator, thereby driving the axial or radial guide vane to rotate, so as to achieve the purpose of controlling the load compressor flow. Due to the inherent characteristics of the structure, the guide vane angle adjustment accuracy is not high. Since the force of the actuator undergoes multiple conversions, and there are often dozens of axial or radial guide vanes, it is very easy to cause inconsistent guide vane angle rotation or guide vane non-following during the adjustment process, resulting in control failure. In addition, since the guide vane is in the mainstream, the blade thickness is often thin. As a thin cantilever mechanism, the guide vane is very likely to break under long-term high-speed airflow and foreign object impact. Furthermore, due to the inevitable separation on the blade surface, it will cause circumferential unevenness of the airflow, causing circumferential disturbance to the impeller and causing vibration problems.

[0038] To this end, the present disclosure proposes an air intake device for a gas turbine.

[0039] The technical problems to be solved by the present disclosure are: a convenient and high-precision new load compressor flow control device with high reliability; solving the problem of circumferential non-uniformity of inlet airflow caused by the presence of guide vanes, and avoiding vibration failure.

[0040] like Figure 1 As shown, an air intake device of a gas turbine includes an air intake device,

[0041] The air intake device includes a load section where a centrifugal compressor is arranged and a power section where a turbine engine is arranged; the load section is used for air intake and power generation; the power section is used for output power;

[0042] The load section and the power section have separate air intakes; the air intake adopts a push-pull flow control structure;

[0043] When the aircraft does not need bleed air and power generation, the load section stops working and the load section air intake passage is closed by adjusting the flow control structure.

[0044] In this embodiment, the push-pull flow control structure is a fence type or a grille type.

[0045] In this embodiment, the fence or mesh of the load section is fixed, and the fence channel or grille channel of the power section is arranged to cross the load section.

[0046] In this embodiment, the power section fence or grille corresponding to the load section fence channel or grille channel is provided with two layers, wherein the upper layer can slide left and right, and balls or rollers are provided between the two layers of fences or grilles.

[0047] In specific implementation, balls or rollers are arranged between the two layers of fences or grilles to reduce sliding resistance, facilitate sliding between the upper layer and the lower layer, and make air intake control more convenient and accurate.

[0048] In order to enable those skilled in the art to better understand the present disclosure, the principles of the present disclosure are described as follows in conjunction with the accompanying drawings:

[0049] The present invention discloses an auxiliary power device with double-sided object air intake with load, and the load section and the power section are separately inlet. Figure 1 The air intake can be set as a fence or grille type. Figure 2 and Figure 3 The fence or mesh of the load section is fixed, the fence channel or mesh channel of the power section is arranged crosswise with the load section, and the power section fence or mesh corresponding to the load section fence channel or mesh channel is arranged with two layers, wherein the outer layer can slide left and right. In order to facilitate sliding, balls or rollers can be arranged between the two layers of fences or meshes. Figure 2 It is a schematic diagram of the fence type, where left: the channel is fully open, middle: the channel is half open, and right: the channel is fully closed; Figure 3 It is a schematic diagram of the grid type, where left: the channel is fully open, middle: the channel is half open, and right: the channel is fully closed; Figure 4 This is a schematic diagram of the fence fully open. Figure 5 This is a schematic diagram of a fence-type half-open; Figure 6 This is a schematic diagram of a fence-type full closure; Figure 7 This is a schematic diagram of the fully opened grille. Figure 8 This is a schematic diagram of a grille-type half-open; Fig. 9 This is a schematic diagram of the grille type fully closed.

[0050] After the grille is added in the present invention, there is no non-uniformity in the airflow parameters along the circumferential direction, and there is no circumferential gradient, so no circumferential excitation source is generated.

[0051] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An air intake device for a gas turbine, characterized in that: The air intake device includes a load section where a centrifugal compressor is arranged and a power section where a turbine engine is arranged; the load section is used for air intake and power generation; the power section is used for output power; The load section and the power section have separate air intakes; the air intake adopts a push-pull flow control structure; When air bleed and power generation are not required, the load section stops working, and the load section air inlet channel is closed by adjusting the flow control structure.

2. The air intake device of a gas turbine according to claim 1, characterized in that: The push-pull flow control structure includes a fence or a grille.

3. The air intake device of a gas turbine according to claim 2, characterized in that: The fence of the fence-type load section is fixed, and the fence of the power section is arranged crosswise with the load section.

4. The air intake device of a gas turbine according to claim 3, characterized in that: The power section fence is provided with at least two layers.

5. The air intake device of a gas turbine according to claim 3, characterized in that: The power section fence is provided with two layers.

6. The air intake device of a gas turbine according to claim 5, characterized in that: The upper layer of the power section fence can slide left and right, and balls or rollers are arranged between the two layers of fences.

7. The air intake device of a gas turbine according to claim 2, characterized in that: The grid of the grid-type load section is fixed, and the grid of the power section is arranged crosswise with the load section.

8. The air intake device of a gas turbine according to claim 7, characterized in that: The power section grid is provided with two layers.

9. The air intake device of a gas turbine according to claim 8, characterized in that: The upper layer of the power section grille can slide left and right, and balls or rollers are arranged between the two layers of grilles.

10. An air intake device for a gas turbine according to claim 6 or 9, characterized in that: The flow control structure is controlled by hydraulic method.

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