Double-wall gas turbine blade with atomization cooling coupling folded plate structure and method

Abstract

The invention discloses a double-wall gas turbine blade with an atomization cooling coupling folded plate structure and a method. The double-wall gas turbine blade comprises a blade body, the blade body comprises a front edge and a tail edge, an interlayer is arranged on the blade body, a plurality of first folded plates are arranged in the interlayer, and at least one main air inlet cavity is formed in the blade body; a plurality of first air holes are formed in the position, close to the front edge, of the inner wall of the main air inlet cavity in the tail edge direction, and the diameters of the first air holes are gradually decreased from the front edge to the tail edge. Counter flow heat and mass transfer is formed through the liquid drop nozzle and cold air sprayed out of any first air hole, meanwhile, evaporated wet air continuously flows towards the tail edge to be mixed with main flow, heat exchange can be conducted in the flowing process, and gasification heat absorption work can be conducted on the basis of heat exchange through atomization of liquid drops. And the heat exchange efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbine blade cooling, and in particular relates to a double-wall gas turbine blade with an atomization cooling coupled folding plate structure and a method. Background Art

[0002] Gas turbines are widely used in aviation, navigation, power generation, military and other fields. The first-stage guide vanes of the high-pressure turbine in the 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, the conventional method is to use cooling technology. Currently, the cooling methods commonly used are blade internal impact cooling and blade surface film cooling. Traditional film cooling technology faces the defects of insufficient lateral heat transfer coverage and being greatly affected by the external air temperature. Summary of the invention

[0003] The object of the present invention is to provide a double-walled gas turbine blade with an atomized cooling coupled folded plate structure and a method to solve the above-mentioned problems.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-walled gas turbine blade with an atomized cooling coupled folded plate structure, comprising a blade body, the blade body comprising a leading edge and a trailing edge, a sandwich layer provided on the blade body, a plurality of folded plates 1 being arranged inside the sandwich layer, at least one main air intake cavity being provided inside the blade body, a plurality of air holes 1 being provided on the inner wall of the main air intake cavity near the leading edge toward the trailing edge, and the diameter of the air holes 1 gradually decreases from the leading edge toward the trailing edge, the plurality of air holes 1 are all arranged obliquely toward the trailing edge, and the main air intake cavity is externally connected to a cold air interface; The blade body is provided with an interlayer to form an outer wall, and a sealing plate is provided on the front of the blade body to seal the entire interlayer with the main air intake cavity to form a complete blade shape. A droplet nozzle is provided on the sealing plate to spray droplets inside the interlayer to form convection with cold air to produce atomization.

[0005] Preferably, a plurality of folding plates 2 are provided inside the outer wall and are vertically arranged between the plurality of folding plates 2 and the interlayer, and flow holes are provided on the folding plates 2 and the interlayer.

[0006] Preferably, at least one trailing edge fixing piece is provided at the trailing edge of the blade body and the trailing edge fixing piece is parallel to the second folding plate, so as to guide the cold air out to the outside under the premise of being fixed.

[0007] Preferably, an air hole 2 is provided between the bottom and the outer wall of the main air inlet cavity for outputting cold air and is connected to the trailing edge fixing piece for outflowing cold air.

[0008] Preferably, the diameters of the plurality of air holes gradually decrease toward the trailing edge so as to achieve a higher air pressure at the bottom near the leading edge, thereby facilitating the atomization and flow of the droplets and preventing backflow.

[0009] The method for using a double-walled gas turbine blade with an atomized cooling coupled folded plate structure comprises the following specific steps: Step 1: cold air is charged, the main air inlet cavity is connected to the external cold air and the cold air flow is directly charged into the main air inlet cavity, and the air is rushed into the outer wall through the air hole 1 between the main air inlet cavity and the outer wall; Step 2: Atomization, using a droplet nozzle to connect an external liquid delivery device, the droplet nozzle and any of the air holes form a countercurrent heat and mass transfer, and at the same time, the evaporated wet air continuously flows toward the trailing edge and mixes with the mainstream. Heat exchange can be carried out during the flow, and the atomization of the droplets can be used to perform gasification and heat absorption on the basis of heat exchange, further increasing the heat exchange efficiency; Step three: Through the multiple air holes, the diameter gradually decreases toward the trailing edge to achieve a higher air pressure at the bottom near the leading edge to facilitate the atomization and flow of droplets and prevent backflow. During this process, the flow holes on the multiple folding plates are used to achieve gas circulation inside the entire outer wall until it flows out from the trailing edge.

[0010] The technical effects and advantages of the present invention are as follows: by using a liquid droplet nozzle connected to an external liquid delivery device, liquid droplets are dripped into the interlayer through the liquid droplet nozzle, and countercurrent heat and mass transfer is formed between the liquid droplet nozzle and the cold air ejected from any one of the air holes, and at the same time, the evaporated wet air continuously flows toward the trailing edge and mixes with the mainstream, and heat exchange can be performed during the flow, during which the atomization of the liquid droplets can be used to perform gasification and heat absorption work on the basis of heat exchange, thereby further increasing the heat exchange efficiency; 2. Through multiple air holes, the diameter gradually decreases toward the trailing edge to achieve a higher air pressure at the bottom near the leading edge, which is convenient for the atomization and flow of droplets to prevent backflow. During this period, the flow holes on the multiple folded plates are used to achieve gas circulation inside the entire outer wall until it flows out from the trailing edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0012] In the figure: 1, leading edge; 2, blade body; 3, interlayer; 4, folding plate 1; 5, folding plate 2; 6, flow hole; 7, outer wall; 8, main air inlet cavity; 9, trailing edge fixing piece; 10, trailing edge; 11, droplet nozzle; 12, air hole 1; 13, air hole 2. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] The present invention provides a double-wall gas turbine blade with an atomization cooling coupling folding plate structure as shown in the figure, including a blade body 2, the blade body 2 including a leading edge 1 and a trailing edge 10, an interlayer 3 is provided on the blade body 2, the blade body 2 is formed into a double-wall structure through the interlayer 3, the outer wall is 7, the inner wall is the outer wall of the blade body 2, a plurality of folding plates 4 are arranged inside the interlayer 3, at least one main air intake cavity 8 is provided inside the blade body 2, a plurality of air holes 12 are provided on the inner wall of the main air intake cavity 8 near the leading edge 1 towards the trailing edge 10, and the diameter of the air holes 12 gradually decreases from the leading edge 1 to the trailing edge 10, and the plurality of air holes 12 are all arranged obliquely towards the trailing edge 10, and the main air intake cavity 8 is externally connected to a cold air interface; An interlayer 3 is provided on the blade body 2 to form an outer wall 7. A sealing plate 14 is provided on the front of the blade body 2 to seal the entire interlayer 3 and the main air intake cavity 8 to form a complete blade shape. A droplet nozzle 11 is provided on the sealing plate 14 to spray droplets inside the interlayer 3 to form convection with cold air to produce atomization.

[0015] Specifically, a plurality of folding plates 5 are disposed inside the outer wall 7 and are vertically disposed between the plurality of folding plates 5 and the interlayer 3 . Both the folding plates 5 and the interlayer 3 are provided with flow holes 6 .

[0016] Specifically, at least one trailing edge fixing member 9 is disposed at the trailing edge 10 of the blade body 2 and the trailing edge fixing member 9 is parallel to the folding plate 2 5 , so that the cold air can be guided out to the outside under the premise of being fixed.

[0017] Specifically, an air hole 2 13 is provided between the bottom of the main air inlet cavity 8 and the outer wall 7 for outputting cold air and is connected to the trailing edge fixing piece 9 for outflowing cold air.

[0018] Specifically, the diameters of the plurality of air holes 12 gradually decrease toward the trailing edge 10 so as to achieve a higher air pressure at the bottom near the leading edge 1 to facilitate the atomization and flow of the droplets and prevent backflow.

[0019] Working principle: the main air intake cavity 8 is connected to the external cold air and the cold air flow is directly filled into the main air intake cavity 8, and the gas is rushed into the outer wall 7 through the air hole 12 between the main air intake cavity 8 and the outer wall 7, and the liquid delivery equipment is connected to the droplet nozzle 11. The liquid droplets are dropped into the interlayer 3 through the droplet nozzle 11, and the cold air ejected from the droplet nozzle 11 and any one of the air holes 12 forms a countercurrent heat and mass transfer. At the same time, the evaporated wet air continuously flows toward the trailing edge and mixes with the mainstream. Heat exchange can be carried out in the flow process, during which the atomization of the droplets can be used to perform gasification and heat absorption on the basis of heat exchange, thereby further increasing the heat exchange efficiency. The diameter of the plurality of air holes 12 gradually decreases toward the trailing edge 10 to achieve a larger bottom air pressure near the leading edge 1, which is convenient for the atomization and flow of the droplets to prevent backflow. During this period, the flow holes 6 on the plurality of folding plates 4 are used to realize the gas circulation inside the entire outer wall 7 until it flows out from the trailing edge 10.

[0020] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-walled gas turbine blade with an atomized cooling coupled folded plate structure, comprising a blade body (2), the blade body (2) comprising a leading edge (1) and a trailing edge (10), an interlayer (3) being provided on the blade body (2), the blade body (2) forming a double-walled structure through the interlayer (3), a plurality of folded plates (4) being provided inside the interlayer (3), characterized in that: At least one main air inlet cavity (8) is provided inside the blade body (2); a plurality of air holes (12) are provided on the inner wall of the main air inlet cavity (8) near the leading edge (1) toward the trailing edge (10); and the diameter of the air holes (12) gradually decreases from the leading edge (1) toward the trailing edge (10); the plurality of air holes (12) are all arranged to be inclined toward the trailing edge (10); and the main air inlet cavity (8) is externally connected to a cold air interface; The blade body (2) is provided with an interlayer (3) to form an outer wall (7); a sealing plate (14) is provided on the front of the blade body (2) for sealing the entire interlayer (3) with the main air intake cavity (8) to form a complete blade shape; a liquid drop nozzle (11) is provided on the sealing plate (14); the liquid drop nozzle (11) is used to spray liquid droplets inside the interlayer (3) to form convection with cold air to produce atomization.

2. The double-walled gas turbine blade with atomized cooling coupled folded plate structure according to claim 1, characterized in that: A plurality of folding plates (5) are also arranged inside the outer wall (7) and are vertically arranged between the plurality of folding plates (5) and the interlayer (3). Both the folding plates (5) and the interlayer (3) are provided with flow holes (6).

3. The double-walled gas turbine blade with atomized cooling coupled folded plate structure according to claim 1, characterized in that: At least one trailing edge fixing member (9) is provided at the trailing edge (10) of the blade body (2), and the trailing edge fixing member (9) is parallel to the second folding plate (5), thereby enabling cold air to be guided out to the outside under the premise of being fixed.

4. The double-walled gas turbine blade with atomized cooling coupled folded plate structure according to claim 1, characterized in that: A second air hole (13) is provided between the bottom of the main air inlet cavity (8) and the outer wall (7) for outputting cold air and is connected to the trailing edge fixing piece (9) for the cold air to flow out.

5. The double-walled gas turbine blade with atomized cooling coupled folded plate structure according to claim 1, characterized in that: The diameters of the plurality of air holes (12) gradually decrease toward the trailing edge (10) so as to achieve a higher air pressure at the bottom near the leading edge (1) to facilitate the atomization and flow of droplets and prevent backflow.

6. A method for using a double-walled gas turbine blade with an atomized cooling coupled folded plate structure, characterized in that: The specific steps are as follows: Step 1: cold air is charged, 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 rushed into the outer wall (7) through the air hole 1 (12) between the main air inlet cavity (8) and the outer wall (7); Step 2: atomization, using a liquid droplet nozzle (11) connected to an external liquid delivery device, droplets are dripped into the inner part of the interlayer (3) through the liquid droplet nozzle (11), and countercurrent heat and mass transfer is formed between the cold air ejected from the liquid droplet nozzle (11) and any one of the air holes (12), and at the same time, the evaporated wet air continuously flows toward the trailing edge and mixes with the mainstream, and heat exchange can be performed during the flow, during which the atomization of the liquid droplets can be used to perform gasification and heat absorption work on the basis of heat exchange, thereby further increasing the heat exchange efficiency; Step three: The diameter of the plurality of air holes (12) gradually decreases toward the trailing edge (10) to achieve a higher bottom air pressure near the leading edge (1) to facilitate the atomization and flow of droplets and prevent backflow. During this process, the flow holes (6) on the plurality of folding plates (4) are used to achieve gas circulation inside the entire outer wall (7) until it flows out from the trailing edge (10).

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