CN212202140U - Tail edge inclined-splitting seam structure based on gas turbine blade - Google Patents
Tail edge inclined-splitting seam structure based on gas turbine blade Download PDFInfo
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- CN212202140U CN212202140U CN202020071670.3U CN202020071670U CN212202140U CN 212202140 U CN212202140 U CN 212202140U CN 202020071670 U CN202020071670 U CN 202020071670U CN 212202140 U CN212202140 U CN 212202140U
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Abstract
The utility model provides a tail edge wedge slit structure based on a gas turbine blade, which is arranged at the tail edge of a blade main body of the gas turbine blade; the tail edge offset split structure comprises an offset split and at least one pair of commutator segments; one end of the front edge is connected with a suction surface side, and the other end of the front edge is connected with a pressure surface side; the pressure surface side is shorter than the suction surface side; the pressure surface side and the suction surface side at the tail edge of the blade form an outflow seam; the outflow seam is positioned at the rear side of the turbulence column; the commutator segments are positioned in the outflow seam and distributed along the depth direction of the outflow seam; along the depth direction of the outflow seam, a cold air channel is formed between the commutator segments. The utility model can simultaneously consider the problems of aerodynamics and cooling, not only greatly reduce the thickness of the tail edge of the gas turbine blade and reduce the temperature of the airflow at the pressure surface side; meanwhile, the heat exchange capability of the pressure surface side can be enhanced.
Description
Technical Field
The utility model belongs to relate to gas turbine blade design field especially relates to a trailing edge splits seam structure partially based on gas turbine blade.
Background
The gas turbine blade is an important component of an aircraft engine, and the trailing edge part of the gas turbine blade is not only one of key positions for ensuring the service life of the gas turbine blade, but also an important area for influencing the cooling efficiency of the blade. The gas turbine converts the internal energy of the gas into mechanical energy, and is a part of the engine where high-temperature gas expands to do work. In operation, the gas turbine sections are at extremely high temperatures, and with increasing power-to-weight ratios, it is anticipated that future gas turbine blades will tend to receive more heat and withstand higher temperatures. The trend of "receiving more heat and withstanding higher temperatures" has necessarily resulted in an increase in the amount of air required to burn the gas turbine blades, an increase in the combustion temperature, and a decrease in the amount of air used to cool the gas turbine blades. In addition, the cooling air quality is also degraded due to the increase in the pressure ratio and the temperature rise through the inter-blade cooling passage. Therefore, the design trend of the gas turbine mentioned above tends to result in extremely high ablation of the trailing edge of the blade, which is a critical component of the gas turbine. Therefore, higher demands are placed on the cooling of the trailing edge of the gas turbine during the design of the gas turbine.
The research shows that the contradiction between the aerodynamic performance and the cooling at the tail edge is prominent: considering from the aerodynamic direction, in order to reduce the size of the trailing edge of the blade and reduce the flow resistance, the thickness of the trailing edge needs to be reduced; and from the aspect of cooling, the thickness of the tail edge is too small, so that a cooling structure is difficult to arrange and the cold air flow required by the tail edge is provided. Therefore, research on a specific cooling structure of the trailing edge portion of the turbine blade has yet to be supplemented.
Disclosure of Invention
The utility model aims at providing a because the trailing edge of gas turbine blade splits the seam structure partially, consider aerodynamics and cooling problem simultaneously, not only can make the trailing edge thickness of gas turbine blade reduce by a wide margin, reduce the air current temperature of pressure face side; meanwhile, the heat exchange capability of the pressure surface side can be enhanced, and part of heat on the suction surface side at the tail edge is transferred to the pressure surface side and is taken away by cooling airflow. In order to achieve the above purpose, the utility model adopts the following technical scheme:
a tail edge wedge-slit structure based on a gas turbine blade is arranged at the tail edge of a blade main body of the gas turbine blade; the blade main body is provided with a front edge and a spoiler column positioned at the rear side of the front edge; one end of the leading edge is connected with a suction surface side, and the other end of the leading edge is connected with a pressure surface side;
the tail edge wedge-split structure comprises an outflow slit and at least one pair of commutator segments;
the pressure surface side is shorter than the suction surface side; the pressure surface side and the suction surface side enclose the outflow seam; the outflow seam is positioned at the rear side of the turbulence column;
the fairing pieces are positioned in the outflow seam and distributed along the depth direction of the outflow seam; the rectifying sheet is embedded between the suction surface side and the pressure surface side; along the depth direction of the inclined splitting seam, a cold air channel is formed between the commutator segments.
Preferably, the fairing comprises a front semicircular section, a rear semicircular section and a straight section connecting the front semicircular section and the rear semicircular section; the radius of the front semicircular section is larger than that of the rear semicircular section.
Preferably, the radius of the front semicircular section is 0.45mm-0.65 mm; the radius of the rear half round section is 0.25mm-0.35 mm.
Preferably, the projection length of the straight section along the connecting line of the circle centers is 3mm-5 mm.
Preferably, the transverse width of the outflow slot is 0.42mm-0.48mm, the length of the flow direction is 5mm-6mm, and the depth is 16 mm.
Preferably, the rear side included angle between the fairing pieces is 9-13 degrees.
The utility model also provides a cooling method of trailing edge inclined to one side split seam structure based on gas turbine blade, including following step:
step 1: the high-temperature combustion gas mixed and combusted in the combustion chamber flows through the blade main body of the turbine blade, firstly reaches the front edge of the blade, and then passes through the suction surface side and the pressure surface side respectively;
step 2: cooling airflow passes through an inner cooling channel in the blade main body, and a part of the cooling airflow is ejected through peripheral air film holes of the blade main body; the other part of the air flows through the turbulence column and then flows out through the cold air channel in the outflow seam;
and step 3: the cooling air flow passing through the cold air passage is mixed with the high-temperature combustion gas at the pressure surface side.
Compared with the prior art, the utility model has the advantages that: the rectifying pieces are positioned at the rear side of the flow disturbing column, the cooling airflow heated in the inner cooling channel of the gas turbine blade flows through the flow disturbing column and then flows out through the outflow seam of the tail edge wedge seam structure, the supersonic velocity spray pipe-shaped (contraction expansion type) cooling airflow channel formed between the rectifying pieces flows out, then the cooling airflow is mixed with the high-temperature gas at the pressure surface side, and the cooling channel can reduce the flow velocity of the outflow cooling airflow and reduce the mixing loss of the main flow high-temperature gas and the outlet cooling air of the wedge seam. In the above process, the temperature of the gas flow on the pressure surface side is reduced and the heat exchange capability is enhanced; the suction side is located on the trailing edge of the blade and the heat is transferred to the pressure side and carried away by the cooling air flow. Therefore, the trailing edge wedge-split structure can effectively reduce the temperature of the trailing edge of the blade, and relieve the influence of mainstream high-temperature gas on the surface of the blade, so that the trailing edge of the gas turbine blade is prevented from being ablated.
Drawings
FIG. 1 is an overall view of a gas turbine blade and a gas turbine blade based trailing edge offset split structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the airfoil of FIG. 1 taken along the direction A-A;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2 of FIG. 1;
fig. 4 is a structural view of the commutator segment in fig. 1.
The blade comprises a blade root 1, a blade body 2, a blade leading edge 21, a suction surface 22, a pressure surface 23, a trailing edge wedge gap structure 24, a blade trailing edge 25, a flow outlet gap 3, a commutator segment 4, a front semicircular segment 41, a straight segment 42, a rear semicircular segment 43, a cold air channel 5, a flow disturbing column 6, an inner cooling channel 7 and a blade top box 8.
Detailed Description
The present invention will be described in greater detail below with reference to the schematic drawings, wherein preferred embodiments of the present invention are shown, based on a gas turbine blade trailing edge split slot configuration, it being understood that those skilled in the art may modify the present invention described herein while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
A tail edge offset split structure based on a gas turbine blade is arranged at a blade tail edge 25 on a blade body 2 of the gas turbine blade, and the tail edge offset split structure 24 comprises an outflow seam 3 and at least one pair of fillets 4.
The structure of the gas turbine blade is as shown in fig. 1: comprising a blade root 1 and a blade body 2, the blade body 2 is mounted at an overhead brake 9. The blade body 2 is provided with a front edge 21 and a spoiler column 6 positioned at the rear side of the front edge 21; the position relation between the blade main body 2 and the blade root 1 and the mutual cooperation process are the prior art; the arrangement of the turbulence column 6 on the blade body 2 is also prior art and will not be described in detail here.
The specific design of the trailing edge offset cleft structure 24 is illustrated in fig. 2: one end of the leading edge 21 is connected to a suction side 22 and the other end of the leading edge 21 is connected to a pressure side 23; the pressure surface side 23 is shorter than the suction surface side 22; the pressure surface side 23 and the suction surface side 22 enclose an outflow slot 3; the suction surface side 22, the pressure surface side 23, the outflow slit 3 and the fairing 4 at the trailing edge 25 of the blade form the trailing edge wedge slit structure 24. The trailing edge offset cleft structure 24 is located on the rear side of the turbulence column 6. Wherein, the transverse width b of the outflow slit 3 and the thickness of the fairing 4 are both 0.42mm-0.48mm, the flow direction length a of the outflow slit 3 is 4mm-6mm, and the depth c is 16mm (see fig. 2 and 3). Wherein, the average distance (the straight line distance of the middle points of the straight sections) L between two adjacent rectifying sheets 4 belongs to [1mm,1.5mm ].
The trailing edge offset cleft structure 24 is formed as follows: cutting off a section of the pressure surface side 23 at the tail edge 25 of the blade, and reserving the structure of the suction surface side 22, wherein the outflow seam 3 is defined between the pressure surface side 23 and the suction surface side 22; then, at least two fairing pieces 4 are arranged behind the flow outlet seam 3 at the rear side of the flow disturbing column 6, and a cold air channel 5 is formed between the fairing pieces 4. The trailing edge wedge slit structure 24 cuts off part of the pressure surface side of the blade trailing edge 25, and compared with the turbine blade trailing edge structure in the prior art, the thickness of the blade trailing edge 25 is greatly reduced.
The position of the fairing 4 in the tail edge offset split structure is designed as shown in figures 1 and 3: the commutator segments 4 are positioned in the outflow slit 3 and distributed along the depth direction of the outflow slit 3; the fairing 4 is embedded between the suction surface side 13 and the pressure surface side 14; along the depth direction of the outflow slit 3, cold air channels 5 are formed between the fillets 4. In the embodiment, the rear side included angle between the adjacent rectifying pieces 4 is 9-13 degrees; the number of the commutator segments 4 is 7. A supersonic spray pipe-shaped (contraction expansion type) channel is formed between the adjacent rectifying pieces 4, and because the cooling air flow is subsonic, the cooling air flow is accelerated in a contraction section (the part of the cooling air channel 5 between the two front semicircular sections 41) between the two rectifying pieces and then decelerated in an expansion section (the part of the cooling air channel 5 behind the two front semicircular sections 41), the cooling air channel 5 can effectively reduce the flow velocity of the cooling air flow and reduce the mixing loss of the cooling air flow and the main stream high-temperature fuel gas.
The structural design of the fairing 4 in the tail edge offset cleft structure 24 is shown in fig. 4: the fairing 4 comprises a front semicircular section 41, a rear semicircular section 43 and a straight section 42 connecting the front semicircular section 41 and the rear semicircular section 43; the radius of the front semicircular segment 41 is greater than the radius of the rear semicircular segment 43. The fairing 4 is smooth in molded surface, a cooling airflow flow field passing through the turbulence column 6 can be uniform, aerodynamic loss is reduced, the temperature of the blade tail edge 25 is uniform, the effectiveness of an integral air film of the blade tail edge 25 is improved, the thermal stress of the blade tail edge 25 is reduced, the fairing 4 plays a role similar to a reinforcing rib on the blade tail edge 25, and the strength between the suction surface side 22 and the pressure surface side 23 is increased.
In this embodiment, the radius of the front semicircular segment 41 is 0.45mm to 0.65 mm; the radius of the back half-round section 43 is 0.25mm-0.35 mm; the projection length of the straight section 42 along the connecting line of the circle centers is 3mm-5 mm.
The working principle of such a gas turbine blade is as follows: the high-temperature combustion gas mixed and burned in the combustion chamber flows through the blade body 2 of the turbine blade, reaches the blade leading edge 21 first, and then passes through the suction surface side 22 and the pressure surface side 23, respectively. The cooling air flow passes through the inner cooling channel 7 in the blade main body 2, one part of the cooling air flow is ejected out through the surrounding air film holes of the blade main body 2 to protect the surface of the blade main body 2, and the other part of the cooling air flow flows through the turbulence column 6 and flows out through the cooling air channel 5 in the outflow seam 3 to cool and protect the trailing edge 25 of the blade.
The research basis of the invention is as follows: the performance of the conventional cleft and the blade Trailing edge 25 is studied in the literature 1 (Cunha F J, Chyu M K. trading-edge linking for gas turbines [ J ]. Journal of pulsing and power, 2006, 22(2): 286-; document 2 (Benson M, D Yapa S, Elkins C, et al, Experimental-based design for trailing edge film coating of gas turbine blades [ J ]. Journal of turbine engineering, 2013, 135 (4)) proposes four structures of the fairing 4 different from the conventional trailing edge cleft, and changes the vortex structure of the blade trailing edge 25, so that the effectiveness of the air film on the surface of the blade trailing edge 25 is improved.
The trailing edge wedge slit structure 24 of the present embodiment simultaneously considers the cooling structure of the aerodynamic and cooling problems, and this structure can greatly reduce the thickness of the trailing edge 25 of the blade of the gas turbine, lower the temperature of the air flow on the pressure surface side 23 and enhance the heat exchange capability of the pressure surface side 23, and at the trailing edge 25 of the blade, part of the heat on the suction surface side 22 is transferred to the pressure surface side 23 and is taken away by the cooling air flow, and at the same time, the wall surfaces of the pressure surface side 23 and the suction surface side 22 can be protected.
To sum up, the utility model relates to a trailing edge split structure based on gas turbine blade according to gas turbine blade internal flow and heat transfer characteristics, excision blade trailing edge 25 department partial pressure face side 23 remains suction face side 22, full play blade trailing edge 25 refrigerated heat transfer characteristics, the advantage is as follows:
1) the temperature at the trailing edge 25 of the blade can be effectively reduced: the flow straightener 4 is located at the rear side of the flow disturbing column 6, and the cooling air flow of the heated part in the inner cooling channel 7 of the blade body 2 flows through the flow disturbing column 6, then flows out through the cooling air channel 5 formed between the flow straighteners 4 in the flow slit 3 at the trailing edge 25 of the blade, and then is mixed with the high-temperature fuel gas at the pressure surface side 23. In the above process, the temperature of the gas flow on the pressure surface side 23 is lowered, and the heat exchange capability of the pressure surface side 23 is enhanced; the heat on the suction side 22 of the blade trailing edge 25 is transferred to the pressure side 23 and carried away by the cooling air flow. Therefore, the structure of the trailing edge split-slit structure 24 can effectively reduce the temperature of the trailing edge 25 of the blade, and relieve the influence of the mainstream high-temperature gas on the surface of the trailing edge 25 of the blade, so that the trailing edge 25 of the gas turbine blade is prevented from being ablated.
2) Reducing the aerodynamic losses of the blade trailing edge 25: the effectiveness of the air film at the blade trailing edge wedge-slit structure 24 is obviously improved, the unsteady vortex near the blade trailing edge 25 can be damaged, and the aerodynamic loss is reduced.
3) The utility model discloses can protect the wall of blade trailing edge 25 suction face side 22 and pressure face side 23.
4) The temperature of the suction surface side and the pressure surface side at the blade tail edge 25 in the blade body 2 is uniform, and the thermal stress of the blade tail edge 25 in the blade body 2 is reduced.
5) The strength of the blade trailing edge 25 in the blade body 2 is increased.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (6)
1. A tail edge wedge-slit structure based on a gas turbine blade is arranged at the tail edge of a blade main body of the gas turbine blade; the blade main body is provided with a front edge and a spoiler column positioned at the rear side of the front edge; one end of the leading edge is connected with a suction surface side, and the other end of the leading edge is connected with a pressure surface side;
the tail edge wedge-splitting structure is characterized by comprising an outflow seam and at least one pair of rectifier plates;
the pressure surface side is shorter than the suction surface side; the pressure surface side and the suction surface side enclose the outflow seam; the outflow seam is positioned at the rear side of the turbulence column;
the fairing pieces are positioned in the outflow seam and distributed along the depth direction of the outflow seam; the rectifying sheet is embedded between the suction surface side and the pressure surface side; along the depth direction of the inclined splitting seam, a cold air channel is formed between the commutator segments.
2. The gas turbine blade-based trailing edge wedge slit structure of claim 1, wherein the fairing comprises a front semicircular segment, a rear semicircular segment, a straight segment connecting the front semicircular segment and the rear semicircular segment; the radius of the front semicircular section is larger than that of the rear semicircular section.
3. The gas turbine blade-based trailing edge wedge slit structure of claim 2, wherein the radius of the front semicircular segment is 0.45mm-0.65 mm; the radius of the rear half round section is 0.25mm-0.35 mm.
4. The gas turbine blade-based trailing edge wedge slit structure of claim 3, wherein the length of the projection of the straight section in the direction of the line connecting the centers of circles is 3mm to 5 mm.
5. The gas turbine blade-based trailing edge wedge slit structure of claim 1, wherein the outflow slit has a transverse width of 0.42mm to 0.48mm, a flow direction length of 5mm to 6mm, and a depth of 16 mm.
6. The gas turbine blade-based trailing edge wedge slit structure of claim 1, wherein a trailing side angle between the fillets is 9 ° -13 °.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020071670.3U CN212202140U (en) | 2020-01-14 | 2020-01-14 | Tail edge inclined-splitting seam structure based on gas turbine blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020071670.3U CN212202140U (en) | 2020-01-14 | 2020-01-14 | Tail edge inclined-splitting seam structure based on gas turbine blade |
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| CN212202140U true CN212202140U (en) | 2020-12-22 |
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