Flame tube honeycomb micro-channel cooling structure based on additive manufacturing

Abstract

The invention aims to provide a flame tube honeycomb micro-channel cooling structure based on additive manufacturing, and belongs to the field of gas turbines. A micro-channel honeycomb cooling structure is arranged on the wall surface of the flame tube, a swirler is mounted on the flame tube, and air cooled by the honeycomb micro-channel cooling structure flows through the swirler and enters the flame tube; the micro-channel honeycomb cooling structure comprises micro-channel honeycomb units, each micro-channel honeycomb unit is arranged from the head of the flame tube to the tail of the flame tube in the axial direction of the flame tube, and the micro-channel honeycomb units are arranged in an array mode in the wall thickness direction of the flame tube. The pin-fin structures are designed in the micro-channel honeycomb units, so that the heat exchange area is increased, the cooling efficiency is improved, the complexity and realizability of the flame tube cooling structure are effectively guaranteed, the additive manufacturing technology is adopted for machining and forming, and the realizability of the complex structure is guaranteed while the cooling efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to a gas turbine structure, specifically a combustor liner structure. Background Art

[0002] Industrial gas turbines are major core equipment in fields such as oil / gas and distributed energy. Most of the air in the gas turbine combustion chamber is used for mixing and combustion to ensure that the combustion temperature in the gas turbine is controlled lower, resulting in a serious shortage of cooling air and making it very difficult to cool the combustor liner wall. To ensure the life and reliability of the combustion chamber, it is urgently necessary to design an efficient combustor liner cooling structure to improve the cooling efficiency.

[0003] The traditional design methods of the hot-end components of gas turbines are basically developed for traditional manufacturing technologies and can no longer meet the increasing performance requirements of gas turbines. Since additive manufacturing technology is essentially different from traditional processing technologies, when designing a low-emission gas turbine combustion chamber, the limitations of traditional manufacturing processes can be relaxed, and the advantages of additive manufacturing technology can be maximally exploited in design. Summary of the Invention

[0004] The purpose of the present invention is to provide a honeycomb microchannel cooling structure of a combustor liner based on additive manufacturing that can ensure both cooling efficiency and the realizability of complex structures.

[0005] The purpose of the present invention is achieved as follows:

[0006] The honeycomb microchannel cooling structure of the combustor liner based on additive manufacturing of the present invention is characterized in that: a microchannel honeycomb cooling structure is arranged on the wall of the combustor liner, and a swirler is installed on the combustor liner. The air cooled by the honeycomb microchannel cooling structure flows through the swirler and enters the combustor liner; the microchannel honeycomb cooling structure includes microchannel honeycomb units. In the axial direction of the combustor liner, each microchannel honeycomb unit is arranged from the head of the combustor liner to the tail of the combustor liner. In the wall thickness direction of the combustor liner, the microchannel honeycomb units are arranged in an array.

[0007] The present invention may further include:

[0008] 1. The microchannel honeycomb units are processed and formed by superalloy powder additive manufacturing technology, and needle fin structures are printed and formed on the inner walls of the microchannel honeycomb units by additive manufacturing technology.

[0009] 2. The shapes of the microchannel honeycomb units include regular hexagons, non-regular hexagons, quadrilaterals or triangles. The adjacent sides of adjacent microchannel honeycomb units are completely fitted. In the wall thickness direction of the combustor liner, each column includes two or more microchannel honeycomb units.

[0010] 3. The flow direction of the cold air in the microchannel honeycomb cooling unit is opposite to that of the high-temperature gas in the flame tube.

[0011] 4. The shape of the pin fin structure is a cone or a cylinder.

[0012] The advantages of the present invention are as follows: The present invention designs a pin fin structure inside the microchannel honeycomb unit to increase the heat transfer area and improve the cooling efficiency. The complexity and feasibility of the flame tube cooling structure are effectively guaranteed. The additive manufacturing technology is used for processing and forming, which not only ensures the cooling efficiency but also ensures the feasibility of the complex structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present invention;

[0014] Figure 2 is a schematic diagram of the honeycomb microchannel cooling structure of the flame tube;

[0015] Figure 3 is a partially enlarged view of the honeycomb microchannel cooling structure;

[0016] Figure 4 is a schematic diagram of the pin fin structure. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in more detail with reference to the accompanying drawings as follows:

[0018] Combined with Figures 1-4 , the honeycomb microchannel cooling structure of the flame tube based on additive manufacturing of the present invention consists of a plurality of microchannel honeycomb units that form the wall surface of the combustion chamber flame tube of a gas turbine; in the thickness and circumferential directions of the flame tube wall surface, the microchannel honeycomb units are arranged in an array according to the structural dimensions of the flame tube. In the thickness direction of the flame tube wall, at least 3 microchannel honeycomb units are arranged; in the axial direction of the flame tube, each microchannel honeycomb unit is arranged from the head to the tail of the flame tube; the cooling air flows into the microchannel honeycomb unit from the rear of the flame tube to cool the wall surface of the flame tube, and the cooled air flows through the swirler and enters the interior of the flame tube to participate in mixing and combustion; this structure can effectively save the amount of cooling air, and at the same time increase the temperature of the cooling air entering the swirler, which is convenient for improving the stability of combustion.

[0019] The microchannel honeycomb unit is processed and formed by high-temperature alloy powder additive manufacturing technology; the shape of the microchannel honeycomb unit can be a regular hexagon, an irregular hexagon, a quadrilateral, a triangle or other structural forms, without being limited by the shape; a pin fin structure is printed and formed inside the microchannel honeycomb unit by additive manufacturing technology, which greatly increases the heat transfer area, thereby effectively improving the cooling efficiency of the wall surface of the flame tube. The number and shape of the pin fin structure can be adjusted according to the microchannel honeycomb unit.

[0020] The cooling air flows into the flame tube from the rear A section, flows forward along the honeycomb cells, exchanges heat with the high-temperature gas inside the flame tube through reverse convective heat transfer, takes away the heat of the flame tube wall, and then flows out from the B section; after flowing out, the cooling air enters the flame tube again through the swirler and mixes and burns with the fuel.

[0021] The advantages of adopting this form of flow heat transfer are as follows. On the one hand, by adopting reverse convective heat transfer, the heat transfer efficiency can be improved. At the same time, multiple honeycomb cells form multiple heat transfer channels, which is conducive to heat transfer; there are a large number of pin fin structures inside the honeycomb cells, which greatly increases the heat transfer area and can significantly improve the heat transfer efficiency, thus minimizing the temperature of the flame tube wall and playing a good protective role for the flame tube. On the other hand, since the cooling air entering the swirler is heated, the heat of the air participating in combustion is increased, the combustion stability of the flame is improved, and the cycle thermal efficiency can also be improved.

[0022] Due to the small size and complex structure of the microchannel honeycomb cells, traditional processes such as casting and welding cannot be used for processing and forming; the use of additive manufacturing technology can effectively solve the problem of processing and forming the complex structure of the microchannel honeycomb cells. The flame tube wall is composed of microchannel honeycomb cells, and the microchannel honeycomb cells are processed and formed by using high-temperature alloy powder additive manufacturing technology; the pin fin structure is printed and formed inside the microchannel honeycomb cells by additive manufacturing technology, and the shape of the pin fin structure can be a cone or a cylinder, and the shape can be changed according to needs; due to the large number of pin fin structures inside the microchannel honeycomb cells, the heat transfer area can be greatly increased, thus effectively improving the cooling efficiency of the flame tube wall and improving the life and reliability of the combustion chamber.

Claims

1. The honeycomb microchannel cooling structure of the flame tube based on additive manufacturing is characterized by: A microchannel honeycomb cooling structure is arranged on the wall of the flame tube, and a swirler is installed on the flame tube. The air cooled by the honeycomb microchannel cooling structure flows through the swirler and enters the flame tube. The microchannel honeycomb cooling structure includes microchannel honeycomb units. In the axial direction of the flame tube, each microchannel honeycomb unit is arranged from the head of the flame tube to the tail of the flame tube, and in the direction of the thickness of the flame tube wall, the microchannel honeycomb units are arranged in an array.

2. The flame tube honeycomb microchannel cooling structure based on additive manufacturing according to claim 1 is characterized in that: The microchannel honeycomb unit is processed and formed by high-temperature alloy powder additive manufacturing technology, and the inner wall of the microchannel honeycomb unit is printed into a pin-fin structure by additive manufacturing technology.

3. The flame tube honeycomb microchannel cooling structure based on additive manufacturing according to claim 1 is characterized in that: The shape of the microchannel honeycomb unit includes a regular hexagon, an irregular hexagon, a quadrilateral or a triangle. The adjacent sides of adjacent microchannel honeycomb units are completely fitted together. In the direction of the thickness of the flame tube wall, each column includes two or more microchannel honeycomb units.

4. The flame tube honeycomb microchannel cooling structure based on additive manufacturing according to claim 1 is characterized in that: The flow direction of the cold air in the microchannel honeycomb cooling unit is opposite to the flow direction of the high-temperature combustion gas in the flame tube.

5. The flame tube honeycomb microchannel cooling structure based on additive manufacturing according to claim 2 is characterized by: The pin-fin structure is in the shape of a cone or a cylinder.

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