A turbine moving blade cooling structure with self-cleaning capability and a turbine moving blade

Abstract

The application belongs to the field of turbine blades, and discloses a turbine moving blade cooling structure with self-cleaning capability and a turbine moving blade, which comprises a U-shaped cooling channel and a rotational flow cavity; the U-shaped cooling channel is arranged along the blade bottom to the blade top of the turbine moving blade; a plurality of turbulence ribs are arranged on the pressure surface of the U-shaped cooling channel to form an inter-rib area; the rotational flow cavity is arranged at the leading edge position of the turbine moving blade and is communicated with the U-shaped cooling channel through a nozzle; the inlet end of the nozzle is communicated with the turbulence rib, and the outlet end is communicated with the air inlet of the rotational flow cavity; the rotational flow cavity is gradually convergent from bottom to top and a contraction section is formed at the top; a blade top film hole is formed at the top of the contraction section, which is used for discharging the particulate pollutants from the turbine moving blade and cooling the blade; the particulate pollutants in the internal cooling channel of the blade are self-cleaned by adopting the structure, the particulate pollutants are effectively prevented from entering the internal turbine moving blade through the secondary air system and forming deposits on the inner wall of the cooling channel, and the cooling effect in the internal turbine moving blade is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of turbine blades, and particularly relates to a turbine moving blade cooling structure with self-cleaning capability and a turbine moving blade. BACKGROUND

[0002] In the process of pursuing higher cycle efficiency of an aero-engine, the turbine inlet temperature continues to rise, so as to exceed the heat-resistant limit of the metal material of the turbine blade. In order to prevent the blade from being burned by the high-temperature gas flow, a large number of cooling structures are usually arranged inside the blade, including serpentine channels, impact holes, film holes, turbulence ribs and turbulence columns. By means of these structures, the low-temperature cooling gas from the compressor can take away heat in the form of forced convection heat exchange, thereby protecting the blade. The normal operation of an aero-engine is closely related to its own structure and operating environment. Just as long-term unprotected exposure of human beings to particulate pollutants can cause particulate pollutants to invade the respiratory system and thus cause obstructive pulmonary disease (OPD), the gas-thermal performance of an aero-engine will also be severely harmed if it is operated in an environment with high particulate pollutant concentration.

[0003] Particulate pollutants can enter the inside of the turbine moving blade through the secondary air system; on the one hand, due to the low temperature and the interaction of various cooling structures, the particulate pollutants form a unique deposition mechanism, making it difficult to predict their harm using mature high-temperature deposition theory; on the other hand, the narrow internal space amplifies the influence of particulate deposits on the performance of the blade and makes it difficult to remove. For the ribbed cooling channel inside the turbine moving blade where the particulate pollutants first arrive, the particulate pollutants will adhere to the inner wall of the cooling channel, and its low thermal conductivity hinders the cooling gas from taking away heat from the blade; in addition, the deposits will accumulate in the rib wall corner area, thereby weakening the heat transfer enhancement effect of the turbulence rib, and in severe cases, the deposits will also block the cooling channel, increasing flow loss.

[0004] Therefore, in the existing internal structure of the turbine moving blade, particulate pollutants can easily enter the inside of the turbine moving blade through the secondary air system, and adhere to the inner wall of the cooling channel to form deposits, which weakens the cooling effect inside the turbine moving blade and causes an increase in flow loss. SUMMARY

[0005] The present application provides a turbine moving blade cooling structure with self-cleaning capability and a turbine moving blade, to solve the technical problem that in the existing internal structure of the turbine moving blade, particulate pollutants can easily enter the inside of the turbine moving blade through the secondary air system, and adhere to the inner wall of the cooling channel to form deposits, which weakens the cooling effect inside the turbine moving blade and causes an increase in flow loss.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical content:

[0007] A turbine blade cooling structure with self-cleaning capability, which is arranged inside a turbine blade and comprises a U-shaped cooling channel and a rotational flow cavity.

[0008] The U-shaped cooling channel is arranged from the blade bottom to the blade top of the turbine blade.

[0009] A plurality of turbulence ribs are arranged on the pressure surface of the U-shaped cooling channel to form inter-rib areas for guiding the particulate contaminants.

[0010] The rotational flow cavity is arranged at the leading edge of the turbine blade and is in communication with the U-shaped cooling channel through a nozzle.

[0011] The inlet end of the nozzle is in communication with the turbulence ribs, and the outlet end is in communication with the gas inlet of the rotational flow cavity.

[0012] The rotational flow cavity is gradually convergent from bottom to top and has a convergent section at the top.

[0013] The top of the convergent section is provided with a blade top film hole for discharging the particulate contaminants from the turbine blade and cooling the turbine blade.

[0014] Further, a plurality of turbulence ribs are arranged on the suction surface of the U-shaped cooling channel; and the inlet end of the nozzle is in communication with the turbulence ribs on the pressure surface of the U-shaped cooling channel.

[0015] Further, the turbulence ribs are arranged obliquely; the turbulence ribs on the gas inlet flow path of the pressure surface of the U-shaped cooling channel are directed to the rotational flow cavity along the cold gas flow direction, and the included angle between the extension direction of the turbulence ribs and the flow direction of the cold gas in the cold gas flow path is between 20° and 70°.

[0016] Further, the nozzle is arranged obliquely and the oblique direction of the corresponding connected turbulence rib is consistent.

[0017] Further, the nozzle is tangentially connected with the ribbed surface on the pressure surface side of the U-shaped cooling channel.

[0018] Further, the nozzle is tangentially connected with the rotational flow cavity.

[0019] Further, the nozzle adopts a square structure and is provided with a plurality of nozzles, each of which is arranged between every two adjacent turbulence ribs.

[0020] Further, every two nozzles are separated by a separator; the flow direction size of the separator is the same as the flow direction cross section of the corresponding turbulence rib, and the height of the separator is 0.5 to 3 times the rib height.

[0021] Further, the nozzles are arranged in sequence one by one between the first and second turbulence ribs of the air inlet flow path, and the number is 4 to 7.

[0022] A turbine moving blade comprises the turbine moving blade cooling structure with self-cleaning capability.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The present application provides a turbine moving blade cooling structure with self-cleaning capability, which is internally provided with a U-shaped cooling channel and a rotational flow cavity, the U-shaped cooling channel and the rotational flow cavity are connected by nozzles and turbulence ribs arranged on the pressure surface of the U-shaped cooling channel; the rotational flow cavity is designed to gradually converge from bottom to top and form a contraction section at the top, and finally the particle pollutants are discharged from the turbine moving blade through the film hole at the blade tip; the structure can make the particle pollutants deflect to the opposite side of the blade rotation direction under the driving of the Coriolis force and gather in the inter-rib area on the pressure surface side; under the guidance of the inclined ribs, the particle pollutants enter the rotational flow cavity through the nozzles; the cold gas containing particle pollutants is tangentially injected into the rotational flow cavity and forms a rotational flow spiraling forward in the direction of the blade tip, which brings a larger wall tangential velocity to the inner wall of the rotational flow cavity, which not only strengthens the heat exchange and cooling capacity of the cold gas to the leading edge of the blade, but also reduces the possibility of particle pollutants depositing in the rotational flow cavity; the top of the rotational flow cavity gradually converges to form a contraction section at the blade tip, and finally the particle pollutants are discharged from the blade through the film hole at the blade tip, realizing the self-cleaning function of the particle pollutants in the internal cooling channel of the blade. The use of the structure can effectively prevent the particle pollutants from entering the internal cooling channel of the turbine moving blade through the secondary air system and forming deposits on the inner wall of the cooling channel, improve the cooling effect, and also use the centrifugal force generated by the rotational flow to promote the discharge of the particle pollutants, thereby reducing the influence of the particle deposits on the performance of the blade, reducing the flow loss, and enhancing the reliability and durability of the turbine moving blade.

[0025] Preferably, in the present application, turbulence ribs are also arranged on the suction surface of the U-shaped cooling channel, which further enhances the turbulence effect in the cooling channel, improves the cooling efficiency, and helps to more uniformly guide the particle pollutants to the rotational flow cavity for discharge.

[0026] Preferably, in the present application, the turbulence ribs are arranged obliquely and form an angle of 20° to 70° with the flow direction of the cold gas in the cold gas flow path, which can more effectively guide the flow of cold gas, improve the heat exchange efficiency, and help to guide the particle pollutants to the rotational flow cavity in a specific direction, thereby enhancing the self-cleaning effect.

[0027] Preferably, in the present application, the nozzles are arranged obliquely and in the same direction as the oblique direction of the corresponding turbulence ribs, which reduces flow loss and makes it easier to form a cold air swirl in the swirl chamber that points to the blade tip direction.

[0028] Preferably, in the present application, the nozzles are tangentially connected to the ribbed surface on the pressure side of the U-shaped cooling channel, which reduces the flow loss of the cold air and makes it easier to guide the particulate pollutants into the swirl chamber.

[0029] Preferably, in the present application, the nozzles are tangentially connected to the swirl chamber, so that the cold air enters the swirl chamber tangentially and forms a swirl therein, which ensures that the cold air forms a strong swirl effect when it enters the swirl chamber from the nozzle, helping to expel the particulate pollutants from the inside of the blade and improving the reliability and durability of the turbine vane.

[0030] Preferably, in the present application, the nozzles are square in structure and arranged in multiple numbers, with each nozzle arranged between every two adjacent turbulence ribs, which can more evenly distribute the cold air flow, improve the cooling efficiency, and help guide the particulate pollutants to the swirl chamber for expulsion from multiple directions.

[0031] Preferably, in the present application, a partition is arranged between every two nozzles, the flow direction size of the partition is the same as the flow direction cross section of the corresponding turbulence rib, and the height of the partition is 0.5 to 3 times the rib height; the presence of the partition increases the stability of the structure and reduces the probability of particulate escaping from the swirl chamber.

[0032] Preferably, in the present application, the nozzles are arranged one by one between the first and second turbulence ribs of the inlet flow path, with a number of 4 to 7; this makes the particulate pollutants start to separate in the area between the first and second turbulence ribs, reducing the probability of particulate pollutants depositing in the internal cooling channel as much as possible; this design ensures that the cold air forms a continuous turbulence effect in the cooling channel, improves the heat exchange efficiency, and helps to more effectively guide the particulate pollutants to the swirl chamber for expulsion; at the same time, a reasonable number of nozzles can also ensure the balance between cooling effect and self-cleaning ability.

[0033] The application further provides a turbine moving blade comprising the turbine moving blade cooling structure with the self-cleaning capability, and the turbine moving blade utilizes the relative position relationship of the internal ribbed U-shaped cooling channel, the leading edge rotational flow cavity and the nozzle, under the guidance of the rotating and tilting disturbance ribs, utilizes the inertia difference between the particle pollutants and the cold gas to separate the particle pollutants from the cold gas and discharge the particle pollutants from the turbine moving blade, and realizes the self-cleaning function of the particle pollutants in the turbine moving blade. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structure schematic view of the turbine moving blade cooling structure with the self-cleaning capability provided by the embodiment of the application;

[0035] Figure 2 A top view of the turbine moving blade cooling structure with the self-cleaning capability provided by the embodiment of the application;

[0036] Figure 3 A migration track of the particle pollutants in the internal cooling channel with the dust removal hole in the traditional turbine moving blade cooling structure provided by the embodiment of the application;

[0037] Figure 4 A migration track of the particle pollutants in the internal cooling channel of the turbine moving blade cooling structure with the self-cleaning capability provided by the embodiment of the application;

[0038] Figure 5 The concentration reduction of the particle pollutants in the internal cooling channel of the turbine moving blade cooling structure with the self-cleaning capability provided by the embodiment of the application;

[0039] Figure 6 The surface Nusselt number distribution of the internal cooling channel of the turbine moving blade cooling structure with the self-cleaning capability provided by the embodiment of the application.

[0040] REFERENCE SIGNS:

[0041] 1, U-shaped cooling channel; 2, disturbance rib; 3, nozzle; 4, rotational flow cavity; 5, contraction section; 6, blade tip film hole; 7, turbine moving blade. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the application, the technical solutions and the beneficial effects more clearly understood, the following specific embodiments are used to further describe the application in detail. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0043] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work fall within the scope of protection of the present application.

[0045] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0046] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0048] In the description of the embodiments of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Example 1

[0050] As mentioned in the background, the particulate pollutants enter the turbine blade through the secondary air system; on the one hand, due to the low temperature and the interaction of various cooling structures, the particulate pollutants form a unique deposition mechanism, making it difficult for mature high-temperature deposition theory to predict its harm; on the other hand, the narrow internal space amplifies the influence of the particle deposits on the performance of the blade and is difficult to clean. For the ribbed cooling channel inside the turbine blade where the particulate pollutants first arrive, the particulate pollutants will adhere to the inner wall of the cooling channel, and its low thermal conductivity hinders the cold gas from taking away the heat in the blade; in addition, the deposits will accumulate in the rib wall corner area, thereby weakening the heat transfer enhancement effect of the turbulence rib, and in severe cases, the deposits will block the cooling channel, increasing the flow loss.

[0051] To solve the above problems, the embodiment provides a turbine blade cooling structure with self-cleaning capability. The relative position relationship of the ribbed U-shaped cooling channel, the rotational flow cavity and the nozzle connecting the two inside the turbine blade is rearranged, so that the turbine blade cooling structure has the function of self-cleaning of particulate pollutants.

[0052] As shown in Figure 1 , the embodiment provides a turbine blade cooling structure with self-cleaning capability, which is arranged inside the turbine blade 7 and specifically includes the following structure:

[0053] The U-shaped cooling channel 1 and the rotational flow cavity 4; wherein the U-shaped cooling channel 1 is arranged along the blade bottom to the blade top of the turbine blade 7, and is also located between the pressure surface and the suction surface of the turbine blade 7; the U-shaped cooling channel 1 also has a pressure surface side and a suction surface side; a plurality of turbulence ribs 2 are arranged on the pressure surface of the U-shaped cooling channel 1, and the plurality of turbulence ribs 2 form an inter-rib area;

[0054] The rotational flow cavity 4 is arranged at the leading edge position of the turbine blade 7 with the largest heat load;

[0055] The inlet end of the nozzle 3 is in communication with the outlet end of the corresponding turbulence rib 2, and the outlet end of the nozzle 3 is in communication with the inlet of the rotational flow cavity 4, that is, the nozzle 3 communicates the rotational flow cavity 4 with the U-shaped cooling channel 1;

[0056] The rotational flow cavity 4 gradually converges from bottom to top, that is, it is tapered from top to bottom, and finally forms a converging section 5 at the top, and the top of the converging section 5 is provided with a blade top film hole 6, and finally the particulate pollutants are discharged from the turbine blade 7 through the blade top film hole 6.

[0057] The cooling structure is provided with a U-shaped cooling channel 1 and a rotational flow cavity 4 inside the turbine moving blade 7, the U-shaped cooling channel 1 is communicated with the rotational flow cavity 4 through the nozzle 3 and the turbulence rib 2 arranged on the pressure surface of the U-shaped cooling channel 1; the rotational flow cavity 4 is designed to gradually converge from bottom to top, and a contraction section 5 is formed at the top, and finally the particle pollutants are discharged from the turbine moving blade 7 through the blade tip film hole 6; the structure can make the particle pollutants deflect to the opposite side of the rotating direction under the driving of the Coriolis force and gather in the inter-rib area on the pressure surface side; under the guidance of the turbulence rib 2, the particle pollutants enter the rotational flow cavity through the nozzle 3; the cold gas containing the particle pollutants is tangentially injected into the rotational flow cavity 4, and a rotational flow spirally advancing to the blade tip direction is formed therein, which brings a larger wall tangential velocity to the inner wall surface of the rotational flow cavity, which not only strengthens the heat exchange and cooling capacity of the cold gas to the blade leading edge, but also reduces the possibility of deposition of the particle pollutants in the rotational flow cavity; the top of the rotational flow cavity 4 gradually converges to form a contraction section 5 at the blade tip, and finally the particle pollutants are discharged from the blade through the blade tip film hole 6, realizing the self-cleaning function of the particle pollutants in the internal cooling channel of the blade. The structure can effectively prevent the particle pollutants from entering the inside of the turbine moving blade through the secondary air system and forming deposits on the inner wall surface of the cooling channel, improve the cooling effect, and also promote the discharge of the particle pollutants by using the centrifugal force generated by the rotational flow, thereby reducing the influence of the particle deposits on the performance of the blade, reducing the flow loss, and enhancing the reliability and durability of the turbine moving blade.

[0058] Embodiment 2

[0059] For example Figure 1 As shown in the drawings, the embodiment also provides a turbine moving blade cooling structure with self-cleaning capability, which is further optimized and improved on the basis of embodiment 1, and specifically as follows:

[0060] The turbine moving blade cooling structure includes a U-shaped cooling channel 1 with a turbulence rib 2 arranged inside the turbine moving blade 7 and a rotational flow cavity 4 located at the leading edge of the blade, and the two are tangentially connected through the nozzle 3 arranged on the pressure surface side of the U-shaped cooling channel 1; the top of the rotational flow cavity 4 gradually converges to form a contraction section 5, and is communicated with the blade tip film hole 6.

[0061] In this embodiment, the turbine moving blade 7 rotates together with the cooling structure inside it, and the nozzle 3 is arranged on the pressure surface of the U-shaped cooling channel 1 on the opposite side of the rotating direction.

[0062] In this embodiment, the rotational flow cavity 4 is arranged at the position of the largest thermal load of the turbine moving blade 7, and the flow path of the U-shaped cooling channel 1 close to the leading edge position is set as the air inlet side, and the two are communicated through the nozzle 3.

[0063] In this embodiment, the inclined arrangement of the turbulence ribs 2 in the U-shaped cooling channel 1 points to the rotational flow cavity 4 along the cold gas flow path, and the angle between the extension direction of the turbulence rib 2 and the flow direction of the cold gas in the cold gas flow path is between 20° and 70°.

[0064] In this embodiment, the nozzle 3 is tangentially connected with the ribbed surface on the pressure side of the U-shaped cooling channel 1, which reduces the flow loss of the cold gas and is easier to guide the particulate contaminants into the rotational flow cavity 4.

[0065] In this embodiment, the nozzle 3 is tangentially connected with the rotational flow cavity 4, so that the cold gas can be tangentially injected into the rotational flow cavity 4 and form a rotational flow therein.

[0066] In this embodiment, the nozzle 3 is square, and the inclined direction is consistent with the turbulence rib 2.

[0067] In this embodiment, the nozzle 3 is not continuous, but is separated by a plurality of partitions. The flow direction size and position of the partition are consistent with the flow direction cross section of the corresponding inclined turbulence rib 2, and the height is 0.5 to 3 times that of the turbulence rib 2.

[0068] In this embodiment, the top of the rotational flow cavity 4 of the blade leading edge, i.e. the convergent section 5, gradually shrinks to the size of the tip film hole 6.

[0069] In this embodiment, the nozzle 3 is arranged between the first turbulence rib 2 and the second turbulence rib 2 of the inlet flow path, and the number is between 4 and 7.

[0070] Therefore, the turbine moving blade cooling structure with self-cleaning ability provided by the embodiment has the following beneficial effects:

[0071] First, the cooling channel and the rotational flow structure are common cooling structures inside the turbine moving blade, so the embodiment does not need to redesign a new cooling structure or increase the consumption of additional cold gas, but can add the self-cleaning function of particulate contaminants by redesigning the relative position relationship of each cooling structure.

[0072] Second, the embodiment uses rotation and turbulence rib induced secondary flow to guide the particulate contaminants with higher Stokes number than the cold gas to a specific area by inertia, thereby facilitating separation.

[0073] Third, for the particulate contaminants just entering the internal U-shaped cooling channel, the embodiment starts separation in the area between the first and second turbulence ribs, so as to reduce the probability of deposition of particulate contaminants in the internal cooling channel as much as possible.

[0074] Fourth, by adjusting the size of the tip film hole, the efficiency of the leading edge rotational flow cooling, the tip film cooling, and the separation of particulate contaminants can be increased or decreased at the same time.

[0075] Fifth, the swirl of cold air formed in the swirl chamber gives the inner wall of the leading edge swirl chamber a higher near-wall tangential velocity, reducing the likelihood of particle deposition therein.

[0076] The turbine blade cooling structure with self-cleaning capability provided by the embodiment will be explained in more detail below with reference to the accompanying drawings:

[0077] As shown in the drawings, Figure 2 The leading edge of the turbine blade 7 directly facing the high-temperature gas usually bears a high thermal load, and a swirl chamber 4 is usually arranged at this position to protect the leading edge in the form of swirl cooling. The nozzle 3 is connected tangentially with the internal cooling channel 1, minimizing flow loss; the nozzle 3 is also connected tangentially with the swirl chamber 4, so that the cold air forms a swirl in the swirl chamber 4 that points to the tip film hole 6, cooling the leading edge of the blade and reducing the deposition of particle pollutants inside the swirl chamber 4.

[0078] As shown in the drawings, Figure 3 , Figure 3 is the migration trajectory of particle pollutants in the conventional internal cooling channel with dust removal holes. Under the influence of the inclined ribs, a pair of vortices with opposite rotation directions is formed in the internal cooling channel, carrying particle pollutants to hit the channel wall multiple times, increasing the likelihood of particle pollutants depositing in the cooling channel; at the tip dust removal hole, only a small amount of small-particle-size particles can be observed to be discharged from the blade with the cold air, while most of the particle pollutants remain in the internal cooling channel.

[0079] As shown in the drawings, Figure 4 , Figure 4 is the migration trajectory of particle pollutants in the internal cooling channel with the particle self-cleaning cooling structure. After entering the internal U-shaped cooling channel 1, the particle pollutants are continuously separated into the swirl chamber 4 from the first nozzle 3, and then spiral towards the tip direction under the entrainment of the cold air swirl, and finally converge at the top contraction section 5 of the swirl chamber 4 and are discharged from the turbine blade 7 through the tip film hole 6, realizing the self-cleaning function of particle pollutants.

[0080] As shown in the drawings, Figure 5 , Figure 5 is the concentration of particle pollutants in the U-shaped cooling channel 1 and the cold air consumption when the tip film hole 5 has the same aperture as the conventional dust removal hole. Through quantitative analysis, it can be found that the particle separation efficiency of the conventional dust removal hole is very low, and there is almost no change in that 99.17% of the particle pollutants remain in the cooling channel after passing through the dust removal hole. When the turbine blade 7 adopts the turbine blade cooling structure with self-cleaning capability, the concentration of particle pollutants in the U-shaped cooling channel 1 can be reduced to 52.33% with only 1% increase in cold air consumption, providing a significant self-cleaning effect of particle pollutants for the internal cooling channel.

[0081] As shown in Figure 6 Figure 6 For the Nusselt number distribution of the surface of the internal cooling channel of the particle self-cleaning cooling structure, it can be found that the side of each flow path of the ribbed U-shaped cooling channel 1 away from the swirl chamber 4 and the nozzle 3 become high heat exchange areas, and obvious cold gas swirl trajectories are observed on the surface of the swirl chamber 4; the tangentially incident cold gas forms a swirl inside the swirl chamber 4, which enhances the protection ability of the internal cold gas of the blade leading edge with a larger near-wall tangential velocity; in addition, by increasing the tip film hole 6, the amount of cold gas entering the swirl chamber 4 can be increased, thereby increasing the cooling capacity of the leading edge swirl chamber 4.

[0082] The present application also provides a turbine moving piece comprising the turbine moving blade cooling structure with self-cleaning capability, which utilizes the relative position relationship of the internal ribbed U-shaped cooling channel, the leading edge swirl chamber and the nozzle, under the guidance of the rotating and tilting disturbance ribs, separates the particle pollutants and the cold gas by using the inertia difference between them and discharges the particle pollutants from the turbine moving piece, thereby realizing the particle pollutant self-cleaning function inside the turbine moving piece; the turbine moving piece has the advantages of simple structure, no need for special process processing and additional cold gas consumption, strong self-cleaning capability and good cooling effect, and can be effectively applied in an aero-engine or a heavy-duty gas turbine, thereby having good popularization and application value.

[0083] In summary, the present application provides a turbine moving blade cooling structure with self-cleaning capability and a turbine moving blade, which has the following advantages compared with the existing turbine moving piece cooling structure:

[0084] ​The turbine moving blade cooling structure comprises a U-shaped cooling channel with a turbulating rib arranged inside the turbine moving blade and a leading edge rotational flow cavity, which are connected through a nozzle.The top of the rotational flow cavity is gradually tapered and connected with a blade tip film hole.In the rotating moving blade, the particle pollutants enter the U-shaped channel with a rib and gather to the side opposite to the rotating direction under the guidance of the inclined turbulating rib and enter the pressure side nozzle, and then the cold gas carrying the particle pollutants enters the leading edge rotational flow cavity; the tangential incident cold gas forms a rotational flow in the cavity, which increases the airflow shear force of the near-wall surface of the cavity, on the one hand, strengthens the convective heat transfer of the leading edge, and on the other hand, prevents the particle pollutants from forming deposition in the rotational flow cavity.The particles finally gather at the top end of the rotational flow cavity and are discharged through the blade tip film hole.The present application separates the particles and the cold gas by using the inertia difference between the particles and the cold gas through the arrangement of the U-shaped cooling channel with a rib inside the turbine moving blade and the leading edge rotational flow cavity, and discharges the particle pollutants from the turbine moving blade, so that the self-cleaning function of the particle pollutants inside the turbine moving blade is realized.The present application has a simple structure, does not need special process and additional cold gas consumption, and can be realized by using the current commonly used turbine moving blade cooling structure processing technology and the conventional rotational flow cooling cold gas consumption; when the present application is used, the cold gas consumption, the cold gas cleanliness requirement and the blade leading edge heat transfer requirement can be selected, and the appropriate nozzle opening size, the nozzle number and the blade tip dust removal hole size are selected.

[0085] The above embodiment is only one of the implementation manners of the technical scheme of the present application, and the scope of the present application is not limited to the above embodiment, but also includes any changes, substitutions and other implementation manners easily thought by those skilled in the art within the technical range disclosed by the present application.

Claims

1. A turbine blade cooling structure having a self-cleaning capability, characterized by, The turbine blade cooling structure is arranged inside a turbine blade (7) and comprises a U-shaped cooling channel (1) and a swirl chamber (4); The U-shaped cooling channel (1) is arranged along the blade bottom to the blade top of the turbine blade (7); A plurality of turbulence ribs (2) are arranged on the pressure surface of the U-shaped cooling channel (1) to form an inter-rib area for guiding the particulate pollutants; The swirl chamber (4) is arranged at the leading edge of the turbine blade (7) and is in communication with the U-shaped cooling channel (1) through a nozzle (3); The inlet end of the nozzle (3) is in communication with the turbulence ribs (2), and the outlet end is in communication with the gas inlet of the swirl chamber (4); The swirl chamber (4) is gradually convergent from bottom to top and has a convergent section (5) at the top; The blade top film hole (6) is arranged at the top of the convergent section (5) for discharging the particulate pollutants from the turbine blade (7) and cooling the turbine blade (7); The turbulence ribs (2) are all arranged obliquely; the turbulence ribs (2) on the pressure gas flow path of the U-shaped cooling channel (1) are directed to the swirl chamber (4) along the cold gas flow direction, and the included angle between the extension direction of the turbulence ribs (2) and the flow direction of the cold gas in the cold gas flow path is between 20° and 70°.

2. The turbine blade cooling structure with self-cleaning capability according to claim 1, characterized in that, A plurality of turbulence ribs (2) are arranged on the suction surface of the U-shaped cooling channel (1); the inlet end of the nozzle (3) is in communication with the turbulence ribs (2) on the pressure surface of the U-shaped cooling channel (1).

3. The turbine blade cooling structure with self-cleaning capability according to claim 1, characterized in that, The nozzle (3) is arranged obliquely, and the oblique direction of the nozzle (3) is consistent with the oblique direction of the corresponding turbulence ribs (2).

4. The turbine blade cooling structure with self-cleaning capability according to claim 1, wherein The nozzle (3) is tangentially connected with the ribbed surface on the pressure surface side of the U-shaped cooling channel (1).

5. The turbine blade cooling structure with self-cleaning capability according to claim 1, wherein The nozzle (3) is tangentially connected with the swirl chamber (4).

6. The turbine blade cooling structure with self-cleaning capability according to claim 1, wherein The nozzle (3) adopts a square structure and is provided with a plurality of nozzles (3), and each nozzle (3) is arranged between every two adjacent turbulence ribs (2).

7. The turbine blade cooling structure with self-cleaning capability according to claim 6, characterized in that, Every two nozzles (3) are separated by a separator; the flow direction size of the separator is the same as the flow direction cross section of the corresponding turbulence rib (2), and the height of the separator is 0.5 to 3 times the rib height.

8. The turbine blade cooling structure with self-cleaning capability according to claim 6, characterized in that, The nozzles (3) are arranged one by one from the first turbulence rib (2) to the second turbulence rib (2) in the gas flow path, and the number is 4 to 7.

9. A turbine vane, characterized by, The turbine blade cooling structure with self-cleaning capability according to any one of claims 1-8.

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