阅读说明：本技术 陶瓷-金属相结合的透平导向叶片及其燃气轮机 (Ceramic-metal combined turbine guide vane and gas turbine thereof ) 是由 张晓东 安柏涛 曾蕴涛 张志鑫 于 2019-11-21 设计创作，主要内容包括：一种陶瓷-金属相结合的透平导向叶片,包括：后半叶身,设置于尾缘一侧,所述后半叶身的材质为金属；前半叶身,设置于前缘一侧,与所述后半叶身分体设计,且所述前半叶身与后半叶身形成完整叶型结构；其中,所述前半叶身的材质为陶瓷,用于降低冷却用冷气需求量。本发明采用分体设计方法,其中前半叶身采用陶瓷材料构成实心的叶片基体,后半叶身及内缘板和外缘板采用传统的金属材质,并采用传统空气冷却结构；因陶瓷的耐高温属性,不需要对前半叶身进行冷却,实现显著减少透平叶片需要的冷气量,且大幅提高了燃气轮机总体性能。(A ceramic-metal bonded turbine guide vane comprising: the rear half blade body is arranged on one side of the tail edge and is made of metal; the front half blade body is arranged on one side of the front edge and is designed to be separated from the rear half blade body, and the front half blade body and the rear half blade body form a complete blade structure; the front half blade body is made of ceramic and used for reducing the cold air demand for cooling. The invention adopts a split design method, wherein the front half blade body adopts a ceramic material to form a solid blade matrix, the rear half blade body, the inner edge plate and the outer edge plate adopt traditional metal materials, and a traditional air cooling structure is adopted; due to the high-temperature resistance of the ceramic, the front half blade body does not need to be cooled, the amount of cold air required by the turbine blade is obviously reduced, and the overall performance of the gas turbine is greatly improved.)

1. A ceramic-metal bonded turbine guide vane comprising:

the rear half blade body is arranged on one side of the tail edge and is made of metal;

the front half blade body is arranged on one side of the front edge and is designed to be separated from the rear half blade body, and the front half blade body and the rear half blade body form a complete blade structure;

the front half blade body is made of ceramic and used for reducing the cold air demand for cooling.

2. The ceramic-metal bonded turbine guide vane of claim 1 wherein the interface of the forward and aft half-bodies is between 0.3 and 0.6 of the relative axial chord length of the full airfoil.

3. The ceramic-metal combined turbine stator blade according to claim 1, wherein both ends of the rear half body are fixedly connected with an inner edge plate and an outer edge plate respectively; the inner edge plate and the outer edge plate are made of the same material as the rear half blade body; and one side of the inner edge plate, which is opposite to the rear half blade body, is provided with a mounting edge.

4. The ceramic-metal combined turbine stator blade according to claim 3, wherein the rear half body, the outer peripheral plate, the inner peripheral plate and the mounting rim are integrally cast from a high temperature alloy material.

5. The ceramic-metal bonded turbine guide vane of claim 3 or 4, further comprising a resilient shim and a cover plate; a positioning groove used for packaging the front half blade body is arranged at the connecting side of the inner edge plate and the rear half blade body; mounting holes are arranged at corresponding positions on the outer edge plate;

one end of the front half blade body penetrates through the mounting hole and is embedded into the positioning groove, and the other end of the front half blade body is packaged at the mounting hole through the elastic gasket and the cover plate in sequence.

6. The ceramic-metal bonded turbine guide vane of claim 5, wherein said positioning groove comprises a groove bottom and a groove sidewall; the bottom of the groove is a plane, and the side wall of the groove is a conical surface.

7. The ceramic-metal combined turbine guide vane according to claim 1, wherein a groove is provided at a blade basin of a front mating surface where the rear half blade body and the front half blade body are in contact with each other, or a groove is provided at a blade basin and a blade back respectively; one or more grooves are arranged along the radial direction at intervals; the cross section of the groove is rectangular.

8. The ceramic-metal combined turbine stator blade according to claim 7, wherein a plurality of film holes are provided in the groove for communicating the outside with the cooling cavity of the rear half-body.

9. The ceramic-metal combined turbine guide vane of claim 8, wherein said film holes are machined by electro-machining or laser drilling.

10. A gas turbine comprising a ceramic-metal bonded turbine guide vane according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of turbine blades of gas turbines, in particular to a ceramic-metal combined turbine guide blade and a gas turbine thereof.

Background

The turbine inlet temperature of a future gas turbine can reach more than 1500 ℃, the safe working temperature of the most advanced high-temperature alloy blade at present is about 900 ℃, the comprehensive cooling effect required by the first-stage guide vane of the turbine is about 0.65-0.7, the cooling air demand of a turbine part can reach more than 20% according to the existing air cooling technical level, the performance of the gas turbine can be reduced by increasing the cooling air consumption, and the cooling air demand is contrary to the design requirement of a high-efficiency gas turbine, so that the development of a ceramic blade structure has important significance for improving the gas turbine technology in China.

Compared with metal blades, the ceramic blades have the main characteristics of high temperature resistance, wear resistance, high hardness, corrosion resistance and other mechanical properties, so that the ceramic blades can directly work in a high-temperature gas environment. However, ceramic blades have not been used for many years in mass engineering applications, primarily because of the poor toughness, flexibility, and installability of ceramics.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a ceramic-metal combined turbine guide vane and a gas turbine thereof, which are intended to at least partially solve at least one of the above-mentioned technical problems.

To achieve the above object, as one aspect of the present invention, there is provided a ceramic-metal combined turbine guide vane comprising:

the rear half blade body is arranged on one side of the tail edge and is made of metal;

the front half blade body is arranged on one side of the front edge and is designed to be separated from the rear half blade body, and the front half blade body and the rear half blade body form a complete blade structure;

the front half blade body is made of ceramic and used for reducing the cold air demand for cooling.

As another aspect of the present invention, there is also provided a gas turbine including the ceramic-metal bonded turbine guide vane as described above.

Based on the technical scheme, the invention at least has one or part of the following beneficial effects:

(1) the blades are of a split structure, the front half blade bodies are made of ceramic materials, and the blade bodies of the ceramic parts do not need to be cooled, so that the cold air demand can be greatly reduced under the same gas incoming flow condition; considering that the trailing edge of the turbine guide blade is too thin, generally about 1mm, the design that the front half blade body made of ceramic materials is arranged on one side of the front edge and the rear half blade body made of metal is arranged on one side of the trailing edge is adopted, and a fragile area of the pure ceramic blade is avoided;

(2) because the inner edge plate and the outer edge plate are still made of metal and are connected with the rear half blade body, the mounting performance of the pure metal blade is kept;

(3) the invention provides a method for packaging a front half blade body by adopting an elastic gasket, which solves the problem that the blade body of a ceramic part cannot meet the matching requirement in a hot state because the linear expansion coefficient of the blade body of a metal part is smaller than that of the blade body of the ceramic part.

Drawings

FIG. 1 is a schematic illustration of a ceramic-metal bonded turbine guide vane assembly according to the present invention;

FIG. 2 is a schematic illustration of the assembly of the ceramic-metal bonded turbine guide vane inner band of the present invention;

FIG. 3 is a schematic illustration of a ceramic-metal bonded turbine guide vane mid-section cooling configuration of the present invention;

FIG. 4 is a schematic cross-sectional half view of a ceramic-metal bonded turbine guide vane according to an embodiment of the present invention;

fig. 5 is a sectional view taken along line a-a of fig. 4.

In the above drawings, the reference numerals have the following meanings:

1. the front half of the blade body; 2. a rear half blade body; 3. an elastic pad; 4. a cover plate; 5. a gas film hole; 6. a groove; 7. installing edges; 8. an inner edge panel; 801. a positioning groove; 9. an outer edge plate.

Detailed Description

The blade structure combining the ceramic material and the metal material fully utilizes the characteristics that the turbine blade body of the gas turbine is thickest at the front edge and thinnest at the tail edge, adopts a split design scheme, and is a blade structure scheme with engineering feasibility. Is characterized in that the front half blade body is made of ceramic material, and the ceramic part blade body is embedded into the rest metal part blade body. The design method is used for the structural design of the guide vane of the gas turbine, and can obviously reduce the cooling air quantity of the turbine vane of the gas turbine.

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

In an embodiment of the present invention, there is provided a ceramic-metal combined turbine guide vane comprising:

the rear half blade body is arranged on one side of the tail edge and is made of metal;

the front half blade body is arranged on one side of the front edge and is designed to be separated from the rear half blade body, and the front half blade body and the rear half blade body form a complete blade structure;

wherein, the material of the first half blade body is ceramic for reducing the cooling air demand for cooling.

In the embodiment of the invention, the interface of the front half blade body and the rear half blade body is at the position of 0.3-0.6 of the relative axial chord length of the complete blade profile.

In the embodiment of the invention, two ends of the rear half blade body are respectively fixedly connected with the inner edge plate and the outer edge plate; the inner edge plate and the outer edge plate are made of the same material as the rear half blade body; the inner edge plate is provided with a mounting edge at one side opposite to the rear half blade body.

In the embodiment of the invention, the rear half blade body, the outer edge plate, the inner edge plate and the mounting edge are all made of high-temperature alloy materials and are integrally cast.

In an embodiment of the present invention, the ceramic-metal combined turbine guide vane further comprises a resilient shim and a cover plate; a positioning groove used for packaging the front half blade body is arranged at the connecting side of the inner edge plate and the rear half blade body; mounting holes are arranged at corresponding positions on the outer edge plate;

one end of the front half blade body penetrates through the mounting hole to be embedded into the positioning groove, and the other end of the front half blade body is packaged at the mounting hole through the elastic gasket and the cover plate in sequence. More specifically, the elastic gasket is clamped between the front half blade body and the cover plate, and the cover plate is welded with the outer end face of the outer edge plate.

In an embodiment of the invention, the positioning groove comprises a groove bottom and a groove side wall; the bottom of the groove is a plane, and the side wall of the groove is a conical surface.

In the embodiment of the invention, a groove is arranged at the blade basin of the front matching surface of the rear half blade body and the front half blade body, or the blade basin and the blade back are respectively provided with a groove; one or more grooves are arranged along the radial direction at intervals; the cross section of the groove is rectangular.

In the embodiment of the invention, a plurality of air film holes are arranged on the groove and are used for communicating the outside with the cooling cavity of the rear half blade body.

In embodiments of the present invention, the gas film holes are made by electro-machining or laser drilling.

As another aspect of the present invention, there is also provided a gas turbine including the ceramic-metal bonded turbine guide vane as described above.

The construction of a ceramic-metal bonded turbine guide vane according to the present invention is further illustrated with reference to the following specific embodiments.