CN117536693A - Variable cross-sectional profile rib, turbine blade and gas turbine - Google Patents
Variable cross-sectional profile rib, turbine blade and gas turbine Download PDFInfo
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- CN117536693A CN117536693A CN202311474117.9A CN202311474117A CN117536693A CN 117536693 A CN117536693 A CN 117536693A CN 202311474117 A CN202311474117 A CN 202311474117A CN 117536693 A CN117536693 A CN 117536693A
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- 238000001816 cooling Methods 0.000 claims abstract description 85
- 239000010432 diamond Substances 0.000 abstract description 24
- 229910003460 diamond Inorganic materials 0.000 abstract description 21
- 230000000694 effects Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003491 array Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/187—Convection cooling
- F01D5/188—Convection cooling with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/221—Improvement of heat transfer
- F05D2260/2212—Improvement of heat transfer by creating turbulence
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/221—Improvement of heat transfer
- F05D2260/2214—Improvement of heat transfer by increasing the heat transfer surface
- F05D2260/22141—Improvement of heat transfer by increasing the heat transfer surface using fins or ribs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a column rib with a variable cross-section shape, a turbine blade and a gas turbine, wherein the column rib is used for being supported in a cooling channel and generating column rib turbulence for cooling air flow in the cooling channel, the column rib comprises a connecting column rib section, a first diamond column rib section and a second diamond column rib section, the cross section of the connecting column rib section is in an airfoil shape or an ellipse shape, the first diamond column rib section is connected with the first end of the connecting column rib section, the second diamond column rib section is connected with the second end of the connecting column rib section, and the edges of the first diamond column rib section and the edges of the second diamond column rib section face the incoming flow direction of the cooling air flow. The column rib adopts a variable cross-section shape, combines the advantages of the diamond column rib and the wing-shaped column rib or the oval column rib, ensures that the part of the column rib, which is close to two side wall surfaces of the cooling channel, is of a diamond structure, the part of the column rib, which is in a main flow area, is of a wing-shaped or oval structure, enhances the heat exchange capacity of the column rib, and simultaneously obviously reduces the pressure loss in the cooling channel.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a column rib with a variable cross-section shape, a turbine blade and a gas turbine.
Background
The gas turbine has important application in various fields such as aviation propulsion, ship propulsion, power generation and the like. At present, the turbine inlet temperature of the gas turbine is far higher than the heat-resistant limit temperature of the high-temperature alloy, and corresponding measures are needed to reduce the running temperature of the blades, so that blade cooling becomes one of important key technologies of the gas turbine for guaranteeing safe and reliable running of the blades.
Turbine high temperature blades are commonly hollow in construction, with the interior of the blade being cooled by high pressure gas extracted from the compressor. In conventional blade trailing edge passages and novel double wall blade internal passages, post rib structures are commonly used for cooling. The column rib can enhance the heat exchange strengthening capability of the inner wall surface of the channel on one hand and the structural strength on the other hand, so that the column rib structure is widely used in the design of the cooling structure in the blade. However, with the increasing temperature of the turbine inlet, the cooling effect of the conventional cylindrical rib structure is limited, and the cooling design requirement cannot be met.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
the inventors found that, in the cooling passage of the turbine blade provided with the columnar ribs, the position where the cooling heat exchange effect mainly occurs is at the both side wall surfaces near the cooling passage, because: the outside of cooling channel's both sides wall is the outer wall of turbine blade, and turbine blade's outer wall and high temperature gas contact, and wall temperature is higher, consequently needs to carry out high-efficient cooling, and the setting of column rib can produce the column rib vortex in cooling channel, and the column rib vortex causes the cooling air current to take place stronger air current disturbance in the wall department that is close to cooling channel, and then is showing reinforcing local heat transfer intensity. Based on the above findings, it is considered that the heat exchange amount of the intermediate shaft portion of the rib is significantly smaller than that of the portion adjacent to the wall surface of the cooling passage, and that the shaft portion causes a major pressure loss in the cooling passage due to a large space occupied by the shaft portion, so that optimization and improvement of the conventional rib structure are required to enhance the heat exchange capacity and the cooling efficiency of the cold air by the inner structure of the turbine blade.
The inventors have conducted simulation tests on rib structures of different cross-sectional shapes, and fig. 1 shows that when a cylindrical rib array, an equilateral diamond rib array, a symmetrical airfoil rib array and an elliptical rib array are respectively disposed in a cooling channel of a turbine blade, a heat exchange enhancement capability (Nu/Nu 0) distribution cloud chart, that is, a knoop-to-seel number lifting coefficient of the channel with the ribs is compared with that of the smooth channel. Fig. 2 is a plot of friction coefficient versus reynolds number for an array of four shaped ribs. As can be seen from the results of fig. 1, the heat exchange strengthening capability of the diamond-shaped column rib is significantly higher than that of the conventional cylindrical column rib, and as can be seen from the results of fig. 2, the pressure loss generated by the airfoil-shaped column rib and the elliptical-shaped column rib is significantly lower than that of the conventional cylindrical column rib.
The present invention aims to solve at least one of the technical problems in the related art to some extent, and it is desired to obtain a column rib structure having higher heat exchange efficiency and smaller pressure loss. For this reason, the embodiment of the invention proposes a column rib of a variable cross-sectional shape, which has a stronger heat exchange efficiency and a smaller pressure loss.
Embodiments of the present invention also provide turbine blades having the ribs of embodiments of the present invention.
Embodiments of the present invention also provide a gas turbine having the turbine blade.
The column rib with the variable cross-section is used for being supported in the cooling channel, and generating column rib turbulence for cooling air flow in the cooling channel, and comprises the following components: the connecting column rib section is provided with a first end and a second end which are opposite to each other in the axial direction, the cross section of the connecting column rib section is an airfoil, the connecting column rib section is provided with a wider front edge and a narrower tail edge, the front edge of the connecting column rib section faces the incoming flow direction of cooling air flow, or the cross section of the connecting column rib section is an ellipse, and the long axis of the ellipse is parallel to the incoming flow direction; the cooling air flow cooling device comprises a first diamond-shaped column rib section and a second diamond-shaped column rib section, wherein the first diamond-shaped column rib section is connected with a first end of the connecting column rib section, the second diamond-shaped column rib section is connected with a second end of the connecting column rib section, and edges of the first diamond-shaped column rib section and edges of the second diamond-shaped column rib section face the incoming flow direction of the cooling air flow.
The column rib is supported in the cooling channel of the turbine blade, so that the structural strength of the turbine blade can be improved to a certain extent, cooling air flow is introduced into the cooling channel, and the cooling air flow impacts the column rib to generate a column rib turbulence effect, so that air flow disturbance is caused, the local heat exchange strength can be remarkably enhanced by the air flow disturbance, and high-efficiency cooling is realized. Since the cooling heat exchange is mainly performed in the cooling passage at the positions near both side wall surfaces of the cooling passage, that is, the positions near both end portions of the column ribs, the column ribs are also mainly used for reinforcing the heat exchange capacity in the passage near the wall surfaces, the heat exchange efficiency in the main flow region away from the wall surfaces is low, and the main pressure loss occurs in the main flow region, which is caused by the column shaft portions of the column ribs.
In addition, the diamond-shaped ribs and the oval-shaped ribs have higher enhanced heat exchange capacity (as shown in fig. 1) compared with the circular ribs, and the airfoil-shaped ribs have smaller flow loss (as shown in fig. 2) compared with the circular ribs. Therefore, the column rib adopts a variable cross-section shape, combines the advantages of the diamond column rib and the airfoil column rib or the elliptic column rib, ensures that the part of the column rib, which is close to two side wall surfaces of the cooling channel, is of a diamond structure, the part of the column rib, which is in a main flow area, is of an airfoil or elliptic structure, enhances the heat exchange capacity of the column rib, and simultaneously obviously reduces the pressure loss in the cooling channel.
In some embodiments, the length of the connecting post rib section in its axial direction is greater than or equal to 1/3 of the length of the post rib in its axial direction.
In some embodiments, the length of the connecting post rib section in its axial direction is greater than or equal to 1/2 of the length of the post rib in its axial direction.
In some embodiments, the cross section of the connecting post rib section is a symmetrical airfoil;
and/or the cross section of the first diamond-shaped column rib section and the cross section of the second diamond-shaped column rib section are symmetrical diamond-shaped, and one diagonal line of the diamond-shaped column rib section is parallel to the incoming flow direction;
and/or, a diagonal line with a longer cross section of the first diamond-shaped column rib section is orthogonal to the incoming flow direction;
and/or a diagonal line with a longer cross section of the second diamond-shaped column rib section is orthogonal to the incoming flow direction;
and/or, the first diamond-shaped column rib section and the second diamond-shaped column rib section are symmetrical relative to the connecting column rib section structure.
In some embodiments, the connecting post rib section is a straight post rib structure; or, the connecting column rib section is of a variable cross-section structure, and the cross-sectional area of the connecting column rib section is gradually reduced from two end parts to the middle part.
In some embodiments, the axial projection of the first diamond-shaped post rib section is symmetrical with respect to the axial projection of the connecting post rib section; and/or, the axial projection of the second diamond-shaped column rib section is symmetrical relative to the axial projection of the connecting column rib section.
In some embodiments, the cross section of the connecting post rib section is an airfoil,
wherein the diagonal length of the cross section of the first diamond-shaped column rib section is equal to the chord length of the cross section of the connecting column rib section, the two opposite edges of the first diamond-shaped column rib section are aligned with the leading edge and the trailing edge of the connecting column rib section respectively, and/or the diagonal length of the cross section of the second diamond-shaped column rib section is equal to the chord length of the cross section of the connecting column rib section, the two opposite edges of the second diamond-shaped column rib section are aligned with the leading edge and the trailing edge of the connecting column rib section respectively;
or the cross section of the connecting column rib section is elliptical,
wherein the diagonal length of the cross section of the first diamond-shaped column rib section is equal to the long axis of the cross section of the connecting column rib section, and/or the diagonal length of the cross section of the second diamond-shaped column rib section is equal to the long axis of the cross section of the connecting column rib section.
In some embodiments, the area of the junction of the first diamond-shaped post rib section and the connecting post rib section is greater than or equal to 1/2 of the axially projected area of the first diamond-shaped post rib section; and/or the area of the joint of the second diamond-shaped column rib section and the connecting column rib section is greater than or equal to 1/2 of the axial projection area of the second diamond-shaped column rib section.
In another aspect of the present invention, a turbine blade in an embodiment includes: a housing defining a cooling passage therein; the column rib array is located in the cooling channel, and the column rib array comprises a plurality of column ribs which are arranged at intervals in an array mode, and the column ribs are the column ribs with the variable cross-section according to any embodiment.
In yet another aspect, the present invention provides a gas turbine engine comprising a turbine blade according to an embodiment of the present invention.
Drawings
FIG. 1 is a heat exchange enhancement capability distribution cloud of three different shaped arrays of ribs (cylindrical, equilateral diamond and symmetrical airfoil arrays of ribs, respectively, from left to right, with an oval array of ribs in the lower view) disposed in the cooling channels of a turbine blade.
Fig. 2 is a plot of friction coefficient versus reynolds number for four differently shaped rib arrays.
FIG. 3 is a schematic view of an array of variable cross-sectional shape ribs in accordance with an embodiment of the present invention.
Fig. 4 is a front view of a variable cross-sectional shape rib according to an embodiment of the present invention.
Fig. 5 is a side view of a variable cross-sectional shape rib according to an embodiment of the present invention.
Fig. 6 is a top view of a variable cross-sectional shape rib according to an embodiment of the present invention.
Fig. 7 is a cross-sectional view of section A-A of fig. 4.
Fig. 8 is a cross-sectional view of another embodiment of the present invention.
Reference numerals:
a column rib 100,
The connecting column rib section 1, the front edge 11, the tail edge 12, the first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring now to FIGS. 3-8, a variable cross-sectional shape rib 100, a turbine blade provided with the rib 100, and a gas turbine having the turbine blade according to an embodiment of the present invention will be described.
The rib 100 in the embodiment of the present invention is used for being supported in the cooling channel, and generates a rib turbulence effect on the cooling air flow in the cooling channel, so as to enhance the cooling strength and cooling efficiency of the cooling air flow. The turbine blade in the embodiment of the invention comprises a shell and a column rib array, wherein a cooling channel is defined in the shell, the column rib array is positioned in the cooling channel and comprises a plurality of column ribs which are arranged at intervals in an array mode, the column ribs are column ribs 100 with variable cross-section shapes in the embodiment of the invention, and cooling air flows in intervals formed among the column ribs 100.
The stud 100 in the embodiment of the present invention includes a connecting stud section 1, a first diamond-shaped stud section 2, and a second diamond-shaped stud section 3. The connecting post rib section 1 has opposite first and second ends in its axial direction.
As shown in fig. 3 to 7, the cross section of the connecting post rib section 1 is an airfoil shape, the connecting post rib section 1 has a wider leading edge 11 and a narrower trailing edge 12, the leading edge 11 of the connecting post rib section 1 faces the incoming flow direction of the cooling air flow, the trailing edge 12 of the connecting post rib section 1 is far away from the incoming flow direction of the cooling air flow, and the outer peripheral surface of the connecting post rib section 1 is streamline. Alternatively, as shown in fig. 8, the cross section of the connecting column rib section 1 is elliptical, and the major axis of the ellipse and the direction of the incoming flow of the cooling air flow are parallel to each other.
One end of the first diamond-shaped column rib section 2 is connected with the first end of the connecting column rib section 1, the other end of the first diamond-shaped column rib section 2 is used for being supported on one side wall surface of the cooling channel, one end of the second diamond-shaped column rib section 3 is connected with the second end of the connecting column rib section 1, and the other end of the second diamond-shaped column rib section 3 is supported on the other side wall surface of the cooling channel. It will be appreciated that the axial directions of the connecting stud rib section 1, the first diamond-shaped stud rib section 2 and the second diamond-shaped stud rib section 3 are parallel to each other. One of the ribs of the first diamond-shaped column rib section 2 and one of the ribs of the second diamond-shaped column rib section 3 face the incoming flow direction of the cooling air flow so that one diagonal line of the cross section of the first diamond-shaped column rib section 2 and one diagonal line of the cross section of the second diamond-shaped column rib section 3 are parallel to the incoming flow direction.
The column rib is supported in the cooling channel of the turbine blade, so that the structural strength of the turbine blade can be improved to a certain extent, cooling air flow is introduced into the cooling channel, and the cooling air flow impacts the column rib to generate a column rib turbulence effect, so that air flow disturbance is caused, the local heat exchange strength can be remarkably enhanced by the air flow disturbance, and high-efficiency cooling is realized. Since the cooling heat exchange is mainly performed in the cooling passage at the positions near both side wall surfaces of the cooling passage, that is, the positions near both end portions of the column ribs, the column ribs are also mainly used for reinforcing the heat exchange capacity in the passage near the wall surfaces, the heat exchange efficiency in the main flow region away from the wall surfaces is low, and the main pressure loss occurs in the main flow region, which is caused by the column shaft portions of the column ribs.
In addition, the diamond-shaped ribs and the oval-shaped ribs have higher enhanced heat exchange capacity than the circular ribs (as shown in fig. 1), and the airfoil-shaped ribs and the oval-shaped ribs also cause less flow loss than the circular ribs (as shown in fig. 2). Therefore, the column rib adopts a variable cross-section shape, combines the advantages of the diamond column rib and the airfoil column rib or the elliptic column rib, ensures that the part of the column rib, which is close to two side wall surfaces of the cooling channel, is of a diamond structure, the part of the column rib, which is in a main flow area, is of an airfoil or elliptic structure, enhances the heat exchange capacity of the column rib, and simultaneously obviously reduces the pressure loss in the cooling channel.
In some embodiments, the length of the connecting stud rib section 1 in its axial direction is made to be equal to or greater than 1/3 of the length of the stud rib 100 in its axial direction. When the length of the connecting rib section 1 is too small (for example, less than 1/3) as the column shaft portion of the column rib 100, the column shaft portion of the column rib 100 is too short, and the pressure loss of the column rib 100 is not significantly reduced. Therefore, the length of the connecting column rib section 1 is ensured to be at least 1/3 of the length of the column rib 100, and the pressure loss caused by the column rib 100 can be obviously reduced under the condition that the heat exchange capacity of the column rib 100 is ensured.
Preferably, the length of the connecting stud rib section 1 in the axial direction thereof is 1/2 or more of the length of the stud rib 100 in the axial direction thereof. That is, the length of the connecting rib section 1 is at least half of the entire length of the rib 100, so that the pressure loss is significantly reduced.
In some preferred embodiments, as shown in fig. 7, the cross section of the connecting post rib section 1 is a symmetrical airfoil. The previous connecting line connecting the front edge point and the rear edge point of the cross section of the column rib section 1 is a chord, and the cross section of the column rib section 1 takes the chord as a symmetrical center line. The cross section of the connecting column rib section 1 is symmetrical wing shape, so that the pressure loss caused by the asymmetry of the structure of the connecting column rib section 1 is avoided, and the pressure loss generated at the connecting column rib section 1 is reduced to the maximum extent.
In some preferred embodiments, as shown in fig. 6, the cross section of the first diamond-shaped column rib section 2 and the cross section of the second diamond-shaped column rib section 3 are both symmetric diamond-shaped, and one diagonal of the diamond-shape is parallel to the incoming flow direction. The cross sections of the first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3 are symmetrical diamond-shaped, so that the problem that the first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3 cause asymmetric turbulence of air flow to cause irregular vortex of the air flow and uneven local cooling effect in a cooling channel is avoided. Therefore, the cross sections of the first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3 are both symmetrical diamond-shaped, and uniform cooling in the cooling channel is facilitated.
For example, in the embodiment shown in fig. 3 to 7, the cross section of the first diamond-shaped column rib section 2 and the cross section of the second diamond-shaped column rib section 3 are both equilateral right-angle diamonds, the lengths of two diagonal lines of the equilateral right-angle diamonds are equal, one diagonal line of the equilateral right-angle diamonds is parallel to the incoming flow direction, and the other diagonal line is perpendicular to the incoming flow direction.
It should be noted that, in other embodiments, the cross section of the first diamond-shaped column rib section 2 and the cross section of the second diamond-shaped column rib section 3 may have other diamond structures with symmetrical structures, and one diagonal line of the diamond structures is parallel to the incoming flow direction.
In some embodiments, one diagonal of the first diamond-shaped rib section 2, which is longer in length, is orthogonal to the incoming flow direction, and the other diagonal, which is shorter, is parallel to the incoming flow direction. For example, the ratio of the lengths of the two diagonals of the first diamond-shaped column rib section 2 is 2:1, so that the relatively longer diagonal of the first diamond-shaped column rib section 2 is orthogonal to the direction of the incoming flow, and the incoming flow impacts the first diamond-shaped column rib section 2 to generate a strong turbulence effect, so that the cooling effect of the column rib 100 is enhanced.
In some embodiments, one diagonal line of the cross section of the second diamond-shaped rib section 3, which is longer, is orthogonal to the incoming flow direction, and the other diagonal line, which is shorter, is parallel to the incoming flow direction, so that the incoming flow impacts the second diamond-shaped rib section 3 to generate a strong turbulence effect, and the cooling effect of the rib 100 is enhanced.
In some preferred embodiments, as shown in fig. 3-5, the first diamond-shaped rib section 2 and the second diamond-shaped rib section 3 are symmetrical with respect to the connecting rib section 1, in other words, the first diamond-shaped rib section 2 and the second diamond-shaped rib section 3 have the same structural shape, so that the strength of turbulence of the ribs generated by the first diamond-shaped rib section 2 and the second diamond-shaped rib section 3 is equal, and therefore, the heat exchange capacity of two side wall surfaces of the cooling channel is balanced, and further, the cooling effect on both sides of the turbine blade is uniform.
In some embodiments, as shown in fig. 3-5, the connecting post rib section 1 is a straight post rib structure having a uniform size, i.e., the connecting post rib section 1 is identical in cross-sectional area and shape throughout its axial direction. The connecting column rib section 1 of the straight column rib structure is easier to manufacture, is even in stress and is strong in structural stability.
Further, as shown in fig. 3 to 5, the first diamond-shaped rib section 2 and the second diamond-shaped rib section 3 are each a straight rib structure having a uniform size, that is, the cross-sectional area and shape of the first diamond-shaped rib section 2 are the same throughout the axial direction thereof, and the cross-sectional area and shape of the second diamond-shaped rib section 3 are the same throughout the axial direction thereof. The first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3 of the straight column rib structure are easier to manufacture, stable in structure and even in turbulence effect.
In other embodiments, the connecting stud rib section 1 is of variable cross-section structure, and the cross-sectional area of the connecting stud rib section 1 gradually decreases from both end portions thereof toward the middle portion thereof. Under the condition of ensuring the basic supporting strength requirement of the connecting column rib section 1, the connecting column rib section 1 is of a variable cross-section structure, the cross-sectional area of the middle part of the connecting column rib section is smaller than that of the two ends of the connecting column rib section, the connecting strength between the first diamond-shaped column rib section 2 and the connecting column rib section 1 and between the second diamond-shaped column rib section 3 and the connecting column rib section 1 is not influenced, and the pressure loss caused by the connecting column rib section 1 can be further reduced.
In some preferred embodiments, the axial projection of the first diamond-shaped rib section 2 is symmetrical with respect to the axial projection of the connecting rib section 1. The term "axial projection" as used herein refers to the projection of the first diamond-shaped rib section 2 or the connecting rib section 1 onto a plane perpendicular to the axial direction thereof.
As an example, as shown in fig. 6 and 7, the axial projection of the first diamond-shaped rib section 2 is an equilateral right-angle diamond, the axial projection of the connecting rib section 1 is a symmetrical airfoil, the chord of the axial projection of the connecting rib section 1 coincides with one diagonal line of the equilateral right-angle diamond, and the equilateral right-angle diamond and the airfoil are in symmetrical structures, so that the structural symmetry of the rib 100 is stronger, and the stress at the connection part between the first diamond-shaped rib section 2 and the connecting rib section 1 is more uniform.
Further, the axial projection of the second diamond-shaped rib section 3 is symmetrical with respect to the axial projection of the connecting rib section 1. Further enhancing the structural symmetry of the rib 100 and making the connection between the second diamond-shaped rib section 3 and the connecting rib section 1 more uniformly stressed.
In some embodiments, as shown in fig. 6 and 7, the cross section of the connecting post rib section 1 is diamond, the diagonal length of the cross section of the first diamond-shaped post rib section 2 is equal to the chord length of the cross section of the connecting post rib section 1, and two opposite edges of the first diamond-shaped post rib section 2 are aligned with the front edge and the tail edge of the connecting post rib section 1 respectively, so that the connecting post rib section 1 can well and firmly support the first diamond-shaped post rib section 2. And/or the diagonal length of the cross section of the second diamond-shaped stud rib section 3 is equal to the chord length of the cross section of the connecting stud rib section 1, and the opposite edges of the second diamond-shaped stud rib section 3 are aligned with the leading edge and the trailing edge of the connecting stud rib section 1, respectively. The connecting column rib section 1 can support the second diamond-shaped column rib section 3 well and stably. And the structure has more proper drawing angle, thereby reducing the manufacturing difficulty of the column rib 100.
In other embodiments, as shown in fig. 8, the cross section of the connecting post rib section 1 is elliptical, where the diagonal length of the cross section of the first diamond-shaped post rib section 2 is equal to the long axis of the cross section of the connecting post rib section 1, and/or the diagonal length of the cross section of the second diamond-shaped post rib section 3 is equal to the long axis of the cross section of the connecting post rib section 1, so as to provide a more suitable draft angle and reduce the manufacturing difficulty of the post rib 100.
In some embodiments, the area of the connection between the first diamond-shaped rib section 2 and the connecting rib section 1 is greater than or equal to 1/2 of the axial projection area of the first diamond-shaped rib section 2, so as to ensure the connection strength between the first diamond-shaped rib section 2 and the connecting rib section 1. The area of the joint of the second diamond-shaped column rib section 3 and the connecting column rib section 1 is more than or equal to 1/2 of the axial projection area of the second diamond-shaped column rib section 3, so that the connection strength between the second diamond-shaped column rib section 3 and the connecting column rib section 1 is ensured.
As an example, as shown in fig. 4-7, the area of the connection of the first diamond-shaped rib section 2 and the connecting rib section 1 is equal to the overlapping area of the axial projection of the first diamond-shaped rib section 2 and the axial projection of the connecting rib section 1. The area of the joint of the second diamond-shaped rib section 3 and the connecting rib section 1 is equal to the superposition area of the axial projection of the second diamond-shaped rib section 3 and the axial projection of the connecting rib section 1.
In some embodiments, the connecting stud rib section 1, the first diamond-shaped stud rib section 2, and the second diamond-shaped stud rib section 3 are integrally formed.
In other embodiments, the connecting column rib section 1, the first diamond-shaped column rib section 2 and the second diamond-shaped column rib section 3 are in a split structure, the first diamond-shaped column rib section 2 is detachably connected with the first end of the connecting column rib section 1, and the second diamond-shaped column rib section 3 is detachably connected with the first end of the connecting column rib section 1.
The column rib 100 with the variable cross-section shape according to the embodiment of the invention combines the advantages of the diamond column rib and the airfoil column rib or the oval column rib, has higher reinforced heat exchange capacity and smaller pressure loss compared with the round column rib, and compared with the cylindrical column rib, the heat exchange efficiency of the column rib 100 provided by the embodiment of the invention is improved by at least 20%, and the pressure loss is reduced by at least 25% through tests.
It should be noted that, as shown in fig. 2, the oval heat exchange rib causes relatively larger pressure loss compared with the airfoil heat exchange rib, but the manufacturing difficulty of the connecting column rib section 1 with the oval cross section is lower than that of the connecting column rib section 1 with the airfoil cross section, so that the cross section of the connecting column rib section 1 can be designed to be oval or airfoil according to the requirement in actual production.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A variable cross-sectional shaped rib for supporting in a cooling passage, generating a rib turbulence to a cooling air flow in the cooling passage, the rib comprising:
the connecting column rib section is provided with a first end and a second end which are opposite to each other in the axial direction, the cross section of the connecting column rib section is an airfoil, the connecting column rib section is provided with a wider front edge and a narrower tail edge, the front edge of the connecting column rib section faces the incoming flow direction of cooling air flow, or the cross section of the connecting column rib section is an ellipse, and the long axis of the ellipse is parallel to the incoming flow direction;
the cooling air flow cooling device comprises a first diamond-shaped column rib section and a second diamond-shaped column rib section, wherein the first diamond-shaped column rib section is connected with a first end of the connecting column rib section, the second diamond-shaped column rib section is connected with a second end of the connecting column rib section, and edges of the first diamond-shaped column rib section and edges of the second diamond-shaped column rib section face the incoming flow direction of the cooling air flow.
2. The variable cross-sectional shape column rib according to claim 1,
the length of the connecting column rib section in the axial direction is more than or equal to 1/3 of the length of the column rib in the axial direction.
3. The variable cross-sectional shape column rib according to claim 1,
the length of the connecting column rib section in the axial direction is more than or equal to 1/2 of the length of the column rib in the axial direction.
4. The variable cross-sectional shape column rib according to claim 1,
the cross section of the connecting column rib section is a symmetrical wing section;
and/or the cross section of the first diamond-shaped column rib section and the cross section of the second diamond-shaped column rib section are symmetrical diamond-shaped, and one diagonal line of the diamond-shaped column rib section is parallel to the incoming flow direction;
and/or, a diagonal line with a longer cross section of the first diamond-shaped column rib section is orthogonal to the incoming flow direction;
and/or a diagonal line with a longer cross section of the second diamond-shaped column rib section is orthogonal to the incoming flow direction;
and/or, the first diamond-shaped column rib section and the second diamond-shaped column rib section are symmetrical relative to the connecting column rib section structure.
5. The variable cross-sectional shape column rib according to claim 1,
the connecting column rib section is of a straight column rib structure;
or, the connecting column rib section is of a variable cross-section structure, and the cross-sectional area of the connecting column rib section is gradually reduced from two end parts to the middle part.
6. The variable cross-sectional shape column rib according to claim 1,
the axial projection of the first diamond-shaped column rib section is symmetrical relative to the axial projection of the connecting column rib section;
and/or, the axial projection of the second diamond-shaped column rib section is symmetrical relative to the axial projection of the connecting column rib section.
7. The variable cross-sectional profile rib according to claim 1, wherein the cross-section of the connecting rib section is an airfoil,
wherein the diagonal length of the cross section of the first diamond-shaped column rib section is equal to the chord length of the cross section of the connecting column rib section, the two opposite edges of the first diamond-shaped column rib section are aligned with the leading edge and the trailing edge of the connecting column rib section respectively, and/or the diagonal length of the cross section of the second diamond-shaped column rib section is equal to the chord length of the cross section of the connecting column rib section, the two opposite edges of the second diamond-shaped column rib section are aligned with the leading edge and the trailing edge of the connecting column rib section respectively;
or the cross section of the connecting column rib section is elliptical,
wherein the diagonal length of the cross section of the first diamond-shaped column rib section is equal to the long axis of the cross section of the connecting column rib section, and/or the diagonal length of the cross section of the second diamond-shaped column rib section is equal to the long axis of the cross section of the connecting column rib section.
8. The variable cross-sectional shape column rib according to claim 1,
the area of the joint of the first diamond-shaped column rib section and the connecting column rib section is more than or equal to 1/2 of the axial projection area of the first diamond-shaped column rib section;
and/or the area of the joint of the second diamond-shaped column rib section and the connecting column rib section is greater than or equal to 1/2 of the axial projection area of the second diamond-shaped column rib section.
9. A turbine blade, comprising:
a housing defining a cooling passage therein;
a column rib array located within the cooling channel, the column rib array comprising a plurality of column ribs arranged in an array spacing, the column ribs being the variable cross-sectional shape column ribs according to any one of claims 1-8.
10. A gas turbine comprising the turbine blade of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311474117.9A CN117536693A (en) | 2023-11-07 | 2023-11-07 | Variable cross-sectional profile rib, turbine blade and gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311474117.9A CN117536693A (en) | 2023-11-07 | 2023-11-07 | Variable cross-sectional profile rib, turbine blade and gas turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117536693A true CN117536693A (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311474117.9A Pending CN117536693A (en) | 2023-11-07 | 2023-11-07 | Variable cross-sectional profile rib, turbine blade and gas turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117536693A (en) |
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2023
- 2023-11-07 CN CN202311474117.9A patent/CN117536693A/en active Pending
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