Double-walled gas turbine blades with atomized cooling coupled folded plate structure and method

Abstract

This invention discloses a double-walled gas turbine blade with an atomizing cooling coupled folding plate structure and a method thereof. The blade body includes a leading edge and a trailing edge. A sandwich structure is formed on the blade body, and multiple folding plates are disposed within the sandwich structure. At least one main air intake chamber is formed inside the blade body. Multiple air holes are formed on the inner wall of the main air intake chamber near the leading edge, with the diameter of the air holes gradually decreasing from the leading edge to the trailing edge. A liquid delivery device is connected to a droplet nozzle, and liquid droplets are injected into the sandwich structure through the droplet nozzle. The droplet nozzle and any one of the air holes form a counter-current heat and mass transfer. Simultaneously, the evaporated humid air continuously flows towards the trailing edge and mixes with the main flow. Heat exchange occurs during this flow, and the atomization of the droplets further enhances heat exchange efficiency by performing vaporization and heat absorption on top of the heat exchange.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas turbine blade cooling, and particularly relates to a double-wall gas turbine blade with atomized cooling coupled with a folded plate structure and a method. BACKGROUND

[0002] Gas turbines are widely used in aviation, navigation, power generation, military and other fields. The first-stage guide vanes of a high-pressure turbine in a gas turbine need to withstand the highest gas temperature and the most complex stress environment. In order to protect the first-stage guide vanes of the high-pressure turbine, a conventional method is to use cooling technology. Currently, the cooling methods commonly used are internal impingement cooling of the blade and gas film cooling of the blade surface. The traditional gas film cooling technology has the defects of insufficient coverage of lateral heat transfer and great influence of external air temperature. SUMMARY

[0003] The purpose of the application is to provide a double-wall gas turbine blade with atomized cooling coupled with a folded plate structure and a method to solve the above problems.

[0004] To achieve the above purpose, the application provides the following technical scheme: a double-wall gas turbine blade with atomized cooling coupled with a folded plate structure, comprising a blade body, the blade body comprising a leading edge and a trailing edge, a sandwich layer being formed on the blade body, a plurality of folded plates one being arranged inside the sandwich layer, at least one main air inlet cavity being formed in the blade body, a plurality of air holes one being formed on the inner wall of the main air inlet cavity near the leading edge and gradually decreasing in diameter from the leading edge to the trailing edge, the air holes one being inclined to the trailing edge, and a cold gas interface being arranged outside the main air inlet cavity.

[0005] A sandwich layer is formed on the blade body to form an outer wall, a sealing plate is arranged on the front surface of the blade body to seal the entire sandwich layer and the main air inlet cavity to form a complete blade shape, a liquid droplet nozzle is arranged on the sealing plate to spray liquid droplets into the sandwich layer to form convection with cold gas to generate atomization.

[0006] Preferably, a plurality of folded plates two are arranged inside the outer wall and perpendicular to the sandwich layer, and flow-through holes are formed on the folded plates two and the sandwich layer.

[0007] Preferably, at least one trailing edge fixing member is arranged at the trailing edge of the blade body and parallel to the folded plates two to guide the cold gas out of the outside world under the premise of being fixed.

[0008] Preferably, air holes two are formed between the bottom of the main air inlet cavity and the outer wall for cold gas output and are connected to the trailing edge fixing member for cold gas outflow.

[0009] Preferably, the plurality of said air holes gradually decrease in diameter towards the trailing edge to achieve a larger air pressure at the bottom near the leading edge to facilitate the atomization and flow of liquid droplets and prevent backflow.

[0010] The method for using the double-wall gas turbine blade with the atomized cooling coupled folded plate structure comprises the following specific steps:

[0011] Step one: cold gas filling, connecting external cold gas by the main air inlet cavity and filling the cold gas flow directly into the main air inlet cavity, and then the gas is flushed into the outer wall through the air hole one between the main air inlet cavity and the outer wall;

[0012] Step two: atomization, connecting the liquid delivery device to the liquid droplet nozzle, forming counterflow heat and mass transfer between the cold gas sprayed by the liquid droplet nozzle and any one of the air holes one, and the evaporated wet air continuously flows towards the trailing edge and mixes with the main flow, heat exchange can be carried out during the flow, and the atomization of the liquid droplets can be used to carry out gasification heat absorption work on the basis of heat exchange, further increasing the heat exchange efficiency;

[0013] Step three: gradually decreasing the diameter of the plurality of said air holes one towards the trailing edge to achieve a larger air pressure at the bottom near the leading edge to facilitate the atomization and flow of liquid droplets and prevent backflow, and the flow-through holes on the plurality of folded plates one are used to realize the gas flow in the entire outer wall until it flows out from the trailing edge.

[0014] The technical effects and advantages of the present application are as follows: by connecting the liquid delivery device to the liquid droplet nozzle, the liquid droplets are dropped into the interlayer through the liquid droplet nozzle, counterflow heat and mass transfer is formed between the cold gas sprayed by the liquid droplet nozzle and any one of the air holes one, the evaporated wet air continuously flows towards the trailing edge and mixes with the main flow, heat exchange can be carried out during the flow, and the atomization of the liquid droplets can be used to carry out gasification heat absorption work on the basis of heat exchange, further increasing the heat exchange efficiency.

[0015] 2. The plurality of air holes one gradually decrease in diameter towards the trailing edge to achieve a larger air pressure at the bottom near the leading edge to facilitate the atomization and flow of liquid droplets and prevent backflow, and the flow-through holes on the plurality of folded plates one are used to realize the gas flow in the entire outer wall until it flows out from the trailing edge. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the present application is shown in the figure;

[0017] Figure 2 The side view structure of the present application is shown in the figure;

[0018] Figure 3 The overall structure of the present application is shown in the figure.

[0019] In the figure: 1, leading edge; 2, blade body; 3, interlayer; 4, folded plate one; 5, folded plate two; 6, flow-through hole; 7, outer wall; 8, main air inlet cavity; 9, trailing edge fixing part; 10, trailing edge; 11, liquid droplet nozzle; 12, air hole one; 13, air hole two. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] The present application provides a double-wall gas turbine blade with atomizing cooling coupled folded plate structure as shown in the figure, comprising a blade body 2, the blade body 2 comprising a leading edge 1 and a trailing edge 10, the blade body 2 being provided with an interlayer 3, the blade body 2 being formed into a double-wall structure through the interlayer 3, the outer wall being 7, the inner wall being the outer wall of the blade body 2, the interlayer 3 being provided with a plurality of folded plate ones 4 inside, the blade body 2 being provided with at least one main air inlet cavity 8 inside, the inner wall of the main air inlet cavity 8 near the leading edge 1 being provided with a plurality of air holes one 12 towards the trailing edge 10 and the diameter of the air holes one 12 gradually decreasing from the leading edge 1 to the trailing edge 10, the plurality of air holes one 12 being inclinedly arranged towards the trailing edge 10, and the main air inlet cavity 8 being provided with a cold gas interface.

[0022] The blade body 2 is provided with an interlayer 3 to form an outer wall 7, the blade body 2 being provided with a sealing plate 14 on the front surface for sealing the entire interlayer 3 and the main air inlet cavity 8 to form a complete blade shape, the sealing plate 14 being provided with a liquid droplet nozzle 11, the liquid droplet nozzle 11 being used for spraying liquid droplets into the interlayer 3 to form convection with cold gas to generate atomization.

[0023] Specifically, the outer wall 7 is further provided with a plurality of folded plate twos 5 and the plurality of folded plate twos 5 are vertically arranged between the interlayer 3, the folded plate twos 5 and the interlayer 3 being provided with flow-through holes 6.

[0024] Specifically, the trailing edge 10 of the blade body 2 is provided with at least one trailing edge fixing part 9 and the trailing edge fixing part 9 is parallel to the folded plate twos 5, so as to guide the cold gas out of the outside under the premise of being fixed.

[0025] Specifically, the main air inlet cavity 8 is provided with an air hole two 13 between the bottom and the outer wall 7 for cold gas output and communication with the trailing edge fixing part 9 for cold gas outflow.

[0026] Specifically, the plurality of air holes one 12 gradually decrease in diameter towards the trailing edge 10 to realize greater air pressure at the bottom near the leading edge 1 to facilitate atomization and flow of liquid droplets and prevent backflow.

[0027] Working principle: the main air cavity 8 is connected to the external cold air and the cold air flow is directly filled into the main air cavity 8, and the gas is flushed into the outer wall 7 through the air hole one 12 between the main air cavity 8 and the outer wall 7, the liquid drop nozzle 11 is connected with the liquid delivery device, the liquid drop is dropped into the interlayer 3 through the liquid drop nozzle 11, and the countercurrent heat transfer and mass transfer are formed by the cold air sprayed by the liquid drop nozzle 11 and any one of the air holes one 12, meanwhile, the evaporated wet air continuously flows to the trailing edge and mixes with the main flow, heat exchange can be carried out in the flowing process, the atomization of the liquid drop can be used to carry out gasification and heat absorption work on the basis of heat exchange, the heat exchange efficiency is further increased, the diameter of the plurality of air holes one 12 gradually decreases towards the trailing edge 10 to realize that the air pressure near the bottom of the leading edge 1 is larger, the atomization and flow of the liquid drop are prevented, and the backflow is prevented, meanwhile, the gas flow through the flow-through holes 6 on the plurality of folding plates one 4 is set to realize the gas flow through the entire outer wall 7 until it flows out from the trailing edge 10.

[0028] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A double-wall gas turbine blade with atomized cooling coupled folded plate structure, comprising a blade body (2), wherein a leading edge (1) and a trailing edge (10) are included on the blade body (2), a interlayer (3) is opened on the blade body (2), the blade body (2) is formed into a double-wall structure through the interlayer (3), and a plurality of folded plates one (4) are arranged inside the interlayer (3), characterized in that: The blade body (2) is internally provided with at least one main air inlet cavity (8), a plurality of air holes (12) are formed on the inner wall of the main air inlet cavity (8) near the leading edge (1) and directed to the trailing edge (10), and the diameters of the air holes (12) gradually decrease from the leading edge (1) to the trailing edge (10); the main air inlet cavity (8) is externally connected to a cold air interface; ​ The blade body (2) is provided with a sandwich layer (3) to form an outer wall (7), and a sealing plate (14) is arranged on the front surface of the blade body (2) to seal the entire sandwich layer (3) and the main air inlet cavity (8) to form a complete blade shape; a liquid droplet nozzle (11) is arranged on the sealing plate (14) to spray liquid droplets into the sandwich layer (3) to form convection with cold air to generate atomization.

2. The double-wall gas turbine vane with atomizing cooling coupled fold plate structure of claim 1, characterized in that: The outer wall (7) is further provided with a plurality of baffle plates (5) arranged perpendicularly between the baffle plates (5) and the sandwich layer (3), and the baffle plates (5) and the sandwich layer (3) are both provided with flow-through holes (6).

3. The double-wall gas turbine vane with atomizing cooling coupled fold plate structure of claim 1, characterized by: The trailing edge (10) of the blade body (2) is provided with at least one trailing edge fixing member (9) parallel to the baffle plates (5) to guide the cold air out of the outside world under the premise of being fixed.

4. The double-wall gas turbine vane with atomizing cooling coupled fold plate structure of claim 1, characterized by: Air holes (13) are formed between the bottom of the main air inlet cavity (8) and the outer wall (7) to output cold air and communicate with the trailing edge fixing member (9) to flow out cold air.

5. The double-wall gas turbine vane with atomizing cooling coupled fold plate structure of claim 1, characterized by: The diameters of the air holes (12) gradually decrease towards the trailing edge (10) to realize a larger air pressure near the bottom of the leading edge (1) to facilitate the atomization and flow of liquid droplets and prevent backflow.

6. A method of using a double-wall gas turbine vane with an atomizing cooling coupled folded plate structure according to claim 1, characterized in that: The specific steps are as follows: Step 1: Cold air charging, the main air inlet cavity (8) is connected to external cold air, and the cold air flow is directly charged into the main air inlet cavity (8), and the air is injected into the outer wall (7) through the air holes (12) between the main air inlet cavity (8) and the outer wall (7); Step 2: Atomization, the liquid droplet nozzle (11) is externally connected to a liquid delivery device, liquid droplets are dropped into the sandwich layer (3) through the liquid droplet nozzle (11), and the cold air sprayed out of the liquid droplet nozzle (11) and any one of the air holes (12) forms a backflow heat transfer and mass transfer, and the evaporated wet air continuously flows towards the trailing edge and mixes with the main flow. During the flow process, heat exchange can be carried out, and the atomization of liquid droplets can be used to carry out gasification and heat absorption work on the basis of heat exchange, further increasing the heat exchange efficiency; Step 3: The diameters of the air holes (12) gradually decrease towards the trailing edge (10) to realize a larger air pressure near the bottom of the leading edge (1) to facilitate the atomization and flow of liquid droplets and prevent backflow, and the flow-through holes (6) on the baffle plates (4) are used to realize the flow of air in the entire outer wall (7) until the air flows out from the trailing edge (10).

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