Blade, turbine and gas turbine

Abstract

The utility model relates to a blade, a turbine and a gas turbine. The blade comprises a body, a plurality of fins and a partition plate, the body is provided with a cavity, the blade is provided with a suction side and a pressure side which are opposite to each other, the fins are arranged in the cavity of the body, a communicated cooling channel is formed by the fins and the inner wall face of the body, and the partition plate is arranged in the cavity of the body in the flowing direction of cooling airflow. The cooling channel is provided with a head end cavity and a tail end cavity, the partition plate is arranged in the tail end cavity, and the two opposite sides of the partition plate in the thickness direction face the pressure side and the suction side respectively. According to the blade, the flowing speed of cold air in the tail end cavity of the cooling channel is increased, the distribution balance of the cold air on the pressure side and the suction side of the tail end cavity is improved, the cooling effect of the cold air in the tail end cavity is improved, and efficient utilization of the cold air is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas turbine, concretely relates to a blade, turbine and gas turbine. BACKGROUND

[0002] The gas turbine is an important power machinery, and has important application in many 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 high-temperature alloy, and corresponding measures must be taken to reduce the blade operating temperature, so that the blade cooling becomes one of the major key technologies of the gas turbine for guaranteeing the safe and reliable operation of the blade.

[0003] In the related art, the high-temperature-resistant blade of the turbine generally adopts a multi-pass cooling channel to cool the inside of the blade.In the middle region of the blade, cooling gas enters the blade from the blade root and cools the blade through a serpentine channel.However, along the flow direction of the cooling gas, part of the cooling gas is discharged from the film hole, the cooling gas amount decreases, and the cooling gas is heated by the wall surface, so the temperature of the cooling gas increases.Therefore, in the last flow of the cooling channel, the cooling gas amount is relatively small, and the temperature is relatively high, so the cooling effect on the corresponding region is not ideal. SUMMARY

[0004] The utility model aims at at least one of the technical problems in the related art to some extent.

[0005] Therefore, the embodiment of the utility model provides a blade, which improves the cooling effect of the cooling gas in the tail end cavity and realizes efficient utilization of the cooling gas.

[0006] The embodiment of the utility model further provides a turbine.

[0007] The embodiment of the utility model further provides a gas turbine.

[0008] According to the blade of the embodiment of the utility model, the body has a cavity, the blade has opposite suction sides and pressure sides, a plurality of rib plates are arranged in the cavity of the body, a plurality of the rib plates and the inner wall surface of the body form a cooling channel in communication, in the flow direction of the cooling gas flow, the cooling channel has a head end cavity and a tail end cavity, the partition plate is arranged in the tail end cavity, and opposite sides of the partition plate in the thickness direction are respectively directed to the pressure side and the suction side.

[0009] The blade of the embodiment of the utility model improves the flow speed of the cooling gas in the tail end cavity of the cooling channel, improves the distribution uniformity of the cooling gas on the pressure side and the suction side of the tail end cavity, improves the cooling effect of the cooling gas in the tail end cavity, and realizes efficient utilization of the cooling gas.

[0010] In some embodiments, the partition has two, and is a first partition and a second partition respectively, the first partition is adjacent to the suction side, the second partition is adjacent to the pressure side, the first partition and the second partition sequentially divide the tail end cavity into a first chamber, an intermediate chamber and a second chamber, and the first chamber, the second chamber and the intermediate chamber are communicated.

[0011] In some embodiments, the vane further comprises a throttle plate, the throttle plate is arranged in the intermediate chamber, and the throttle plate is provided with a throttle hole so that the cooling airflow entering the intermediate chamber flows to the outlet of the intermediate chamber of the tail end cavity through the throttle plate.

[0012] In some embodiments, the thickness direction of the throttle plate is parallel to the depth direction of the tail end cavity.

[0013] In some embodiments, the partition is connected to the two ribs of the tail end cavity on both sides in the width direction of the partition.

[0014] In some embodiments, one end of the partition in the length direction of the partition is spaced apart from the inner wall surface of the body, and the one end of the partition is located at the inlet of the tail end cavity.

[0015] In some embodiments, the other end of the partition in the length direction of the partition is connected to the inner wall surface of the body.

[0016] In some embodiments, the length direction of the partition is parallel to the depth direction of the tail end cavity.

[0017] The turbine of the embodiment of the utility model comprises the vane of any one of the embodiments.

[0018] The vane of the turbine of the embodiment of the utility model has good cooling effect.

[0019] The gas turbine of the embodiment of the utility model comprises the vane of any one of the embodiments or the turbine of any one of the embodiments.

[0020] The vane of the gas turbine of the embodiment of the utility model has good cooling effect. DRAWINGS

[0021] Figure 1 It is a partial structure schematic view of the vane (throttle plate not shown) of the embodiment of the utility model;

[0022] Figure 2 It is a structure schematic view of the vane of the embodiment of the utility model;

[0023] Figure 3 It is a flow schematic view of the cooling airflow of the vane of the embodiment of the utility model;

[0024] REFERENCE NUMERALS:

[0025] vane 100;

[0026] body 1, cavity 10, suction side 11, pressure side 12, film hole 13;

[0027] rib 2, cooling passage 20, head-end cavity 201, tail-end cavity 202, first cavity 2021, middle cavity 2022, second cavity 2023;

[0028] partition 3, first partition 3a, second partition 3b;

[0029] throttle plate 4, throttle hole 41. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, examples of which are shown in the drawings. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] The embodiments of the present application are described in detail below, examples of which are shown in the drawings. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application. Figures 1 to 3 The vane 100, turbine and gas turbine of the embodiments of the present application are described in detail.

[0032] The vane 100 of the embodiments of the present application comprises a body 1, a plurality of ribs 2 and a partition 3.

[0033] The body 1 has a cavity 10, the vane 100 has opposite suction side 11 and pressure side 12, and the body 1 is provided with film holes 13 on the suction side 11 and the pressure side 12. The plurality of ribs 2 are arranged in the cavity 10 of the body 1, and the plurality of ribs 2 and the inner wall surface of the body 1 form a cooling passage 20. In the flow direction of the cooling airflow, the cooling passage 20 has a head-end cavity 201 and a tail-end cavity 202. The cooling airflow enters the cooling passage 20 from the head-end cavity 201, and flows through each cavity of the cooling passage 20 in turn, wherein a part of the cooling airflow is discharged from the film holes when flowing through each cavity, and a part of the cooling airflow finally enters the tail-end cavity 202 of the cooling passage 20 and is discharged from the film holes and the outlet (not shown in the figure) of the tail-end cavity 202. The partition 3 is arranged in the tail-end cavity 202, and the opposite two sides of the partition 3 in the thickness direction thereof are respectively directed towards the pressure side 12 and the suction side 11.

[0034] According to the blade 100 in the embodiment of the utility model, the baffle 3 is arranged in the tail end cavity 202, on the one hand, the baffle 3 has a certain size and can occupy a certain space of the tail end cavity 202, thereby the circulation space of the tail end cavity 202 can be reduced, the circulation area of the tail end cavity 202 can be reduced, the flow speed of the cooling airflow can be improved, the convection heat transfer coefficient of the cooling air in the channel of the tail end cavity 202 can be increased, and the cooling effect of the cooling air can be improved; on the other hand, the opposite two sides of the baffle 3 in the thickness direction thereof are respectively directed to the pressure side 12 and the suction side 11, so that the baffle 3 forms a barrier for the airflow flowing from the pressure side 12 to the suction side 11 or flowing from the suction side 11 to the pressure side 12, the transverse flow (flowing from the pressure side 12 to the suction side 11 or flowing from the suction side 11 to the pressure side 12) of the cooling airflow is reduced, the flow loss of the cooling airflow is reduced, the distribution of the cooling airflow on the pressure side 12 and the suction side 11 is more uniform, and the cooling effect of the cooling airflow on the pressure side 12 and the suction side 11 of the tail end cavity 202 is improved.

[0035] Therefore, the blade 100 in the embodiment of the utility model improves the flow speed of the cooling air in the tail end cavity 202 of the cooling channel 20, improves the distribution uniformity of the cooling air on the pressure side 12 and the suction side 11 of the tail end cavity 202, improves the cooling effect of the cooling air in the tail end cavity 202, and realizes efficient utilization of the cooling air.

[0036] For example, the shape of the cooling channel can be a serpentine channel, a straight channel, or a channel with different cross-sectional shapes, and it can be understood that the specific shape of the cooling channel can be selected according to actual design requirements, and the present application does not limit this.

[0037] In some embodiments, the baffle 3 has two and is respectively a first baffle 3a and a second baffle 3b, the first baffle 3a is adjacent to the suction side 11, the second baffle 3b is adjacent to the pressure side 12, and the first baffle 3a and the second baffle 3b sequentially divide the tail end cavity 202 into a first chamber 2021, an intermediate chamber 2022 and a second chamber 2023, and the first chamber 2021, the second chamber 2023 and the intermediate chamber 2022 are communicated. After the cooling airflow enters from the inlet of the tail end cavity 202, it flows into the first chamber 2021, the intermediate chamber 2022 and the second chamber 2023 respectively, the cooling air of the first chamber 2021 is discharged from the air film hole corresponding to the first chamber 2021, the cooling air of the second chamber 2023 is discharged from the air film hole corresponding to the second chamber 2023, and the cooling air of the intermediate chamber 2022 is discharged from the outlet of the tail end cavity 202 corresponding to the intermediate chamber 2022.

[0038] The two partitions 3 can further increase the space occupied in the tail end cavity 202, further reduce the flow area of the tail end cavity 202, further increase the flow speed of the cooling airflow, further increase the convective heat transfer coefficient of the cooling airflow in the tail end cavity 202, and further improve the cooling effect of the cooling airflow in the tail end cavity 202.

[0039] Specifically, one end of the partition 3 in the length direction is spaced apart from the inner wall surface of the body 1, and the one end of the partition 3 is located at the inlet of the tail end cavity 202. Therefore, the depths of the first chamber 2021, the middle chamber 2022, and the second chamber 2023 are the same as the depth of the tail end cavity 202, and the inlets of the first chamber 2021, the middle chamber 2022, and the second chamber 2023 are communicated.

[0040] The other end of the partition 3 in the length direction is connected to the inner wall surface of the body 1, so that the cooling airflow cannot pass through the other end of the partition 3, thereby further increasing the resistance of the partition 3 to the cross flow of the cooling airflow, further reducing the cross flow of the cooling airflow, and further reducing the flow loss of the cooling airflow, so that the distribution of the cooling airflow on the pressure side 12 and the suction side 11 is more uniform, thereby further improving the cooling effect of the cooling airflow on the pressure side 12 and the suction side 11 of the tail end cavity 202.

[0041] In some embodiments, the two sides of the partition 3 in the width direction are respectively connected to the two ribs 2 of the tail end cavity 202. The two ribs 2 forming the opposite two wall surfaces of the tail end cavity 202 are connected to the partition 3, so that the cooling airflow cannot pass through the two sides of the partition 3 in the width direction, thereby further increasing the resistance of the partition 3 to the cross flow of the cooling airflow, and further reducing the cross flow of the cooling airflow.

[0042] Therefore, the three sides (the two sides in the width direction and the other end in the length direction) of the partition 3 all block the flow of the cooling airflow, thereby greatly reducing the fluid cross flow loss, making the distribution of the cooling airflow on the pressure side 12 and the suction side 11 more uniform, and improving the cooling effect of the cooling airflow on the pressure side 12 and the suction side 11 of the tail end cavity 202.

[0043] In some embodiments, the vane 100 further comprises a throttle plate 4 arranged in the intermediate chamber 2022, and the throttle plate 4 is provided with a throttle hole 41 so that the cooling air flowing into the intermediate chamber 2022 flows through the throttle plate 4 to the outlet of the intermediate chamber 2022. In the case that the amount of cooling air flowing into the tail end chamber 202 remains unchanged, the throttle plate 4 arranged in the intermediate chamber 2022 reduces the amount of cooling air flowing into the intermediate chamber 2022, which is equivalent to reducing the flow space of the tail end chamber 202, not only makes more cooling air flow into the first chamber 2021 and the second chamber 2023, that is, improves the amount of cooling air distribution of the pressure side 12 and the suction side 11 of the tail end chamber 202, but also improves the flow speed of the cooling air, thereby further improving the convective heat transfer coefficient of the pressure side 12 and the suction side 11 of the tail end chamber 202, and further improving the cooling effect of the cooling air.

[0044] In some embodiments, as shown in Figure 2 The length direction of the partition plate 3 is parallel to the depth direction of the tail end chamber 202, which not only facilitates the installation of the first partition plate 3a and the second partition plate 3b of the partition plate 3, reduces the installation difficulty of the vane 100, but also makes the shapes of the first chamber 2021, the intermediate chamber 2022 and the second chamber 2023 separated by the first partition plate 3a and the second partition plate 3b more regular, which is convenient for calculating, designing and controlling the size and air inlet amount of the first chamber 2021, the intermediate chamber 2022 and the second chamber 2023, thereby facilitating further optimization of the cooling effect of the cooling air flow on the pressure side 12 and the suction side 11.

[0045] Further, the thickness direction of the throttle plate 4 is parallel to the depth direction of the tail end chamber 202, and the throttle plate 4 is perpendicular to the first partition plate 3a and the second partition plate 3b of the partition plate 3, which facilitates the installation of the throttle plate 4 and further reduces the installation difficulty of the vane 100.

[0046] Specifically, the throttle plate 4 is adjacent to the inlet, the middle position or the outlet of the intermediate chamber 2022.

[0047] Specifically, as shown in Figure 1 and Figure 2 The volume of the first chamber 2021 and the volume of the second chamber 2022 are both smaller than the volume of the intermediate chamber 2022, thereby facilitating further improvement of the flow speed of the cooling air in the first chamber 2021 and the second chamber 2022, thereby further improving the convective heat transfer coefficient of the pressure side 12 and the suction side 11 of the tail end chamber 202, and further improving the cooling effect of the cooling air.

[0048] The turbine of the embodiment of the utility model is described below.

[0049] The turbine of the embodiment of the utility model comprises the vane 100 of any one of the above-mentioned embodiments.

[0050] Therefore, the blade 100 of the turbine has good cooling effect.

[0051] The gas turbine is described below.

[0052] The gas turbine comprises the blade 100 or the turbine of any of the above embodiments.

[0053] Therefore, the blade 100 of the gas turbine has good cooling effect.

[0054] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0055] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0056] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0058] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0059] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A vane (100), characterized in that, Comprising: a body (1) having a cavity (10), the blade (100) having opposite suction side (11) and pressure side (12); a plurality of ribs (2) arranged in the cavity (10) of the body (1), the plurality of ribs (2) and the inner wall surface of the body (1) forming a cooling channel (20) in communication, the cooling channel (20) having a head end cavity (201) and a tail end cavity (202) in the flow direction of the cooling airflow; and a partition plate (3) arranged in the tail end cavity (202), the partition plate (3) having opposite two sides in its thickness direction respectively facing the pressure side (12) and the suction side (11).

2. The blade (100) according to claim 1, characterized in that The partition plate (3) has two and is respectively a first partition plate (3a) and a second partition plate (3b), the first partition plate (3a) being adjacent to the suction side (11), the second partition plate (3b) being adjacent to the pressure side (12), the first partition plate (3a) and the second partition plate (3b) sequentially separating the tail end cavity (202) into a first chamber (2021), an intermediate chamber (2022) and a second chamber (2023), the first chamber (2021), the second chamber (2023) and the intermediate chamber (2022) being in communication.

3. The blade (100) according to claim 2, characterized in that Further comprising a throttle plate (4) arranged in the intermediate chamber (2022), the throttle plate (4) being provided with a throttle hole (41) so that the cooling airflow entering the intermediate chamber (2022) flows through the throttle plate (4) to the outlet of the intermediate chamber (2022) in the tail end cavity (202).

4. The blade (100) according to claim 3, characterized in that The thickness direction of the throttle plate (4) is parallel to the depth direction of the tail end cavity (202).

5. The blade (100) according to claim 1, characterized in that The partition plate (3) has opposite two sides in its width direction respectively connecting two ribs (2) of the tail end cavity (202).

6. The blade (100) according to claim 1, characterized in that One end of the partition plate (3) in its length direction is spaced apart from the inner wall surface of the body (1), the one end of the partition plate (3) being located at the inlet of the tail end cavity (202).

7. The blade (100) according to claim 6, characterized in that The other end of the partition plate (3) in its length direction is connected with the inner wall surface of the body (1).

8. The blade (100) according to claim 1, characterized in that The length direction of the partition plate (3) is parallel to the depth direction of the tail end cavity (202).

9. A turbine characterized by The blade (100) according to any one of claims 1 to 8.

10. A gas turbine engine characterized by, The turbine according to claim 9.

Images