Gas hot corrosion test device for windmill type engine turbine blade

Abstract

The invention belongs to the field of test devices, and particularly relates to a windmill type engine turbine blade gas hot corrosion test device, a nozzle is arranged in a high temperature furnace, and a gas supply device, a fuel tank and a brine tank are communicated with the nozzle; the windmill type test fixture has a degree of freedom of moving in and out of the high-temperature furnace and comprises a windmill disc, a driving device for driving the windmill disc to rotate and a plurality of clamping frames circumferentially distributed on the windmill disc; the windmill disc is provided with a cavity, a plurality of air outlet cylinders connected with the cavity are arranged in the circumferential direction, the cavity is communicated with an air supply device, one end of the clamping frame is a clamping head, the other end of the clamping frame is a clamping rod, an inner cavity of the clamping head is provided with an open groove used for being connected with a blade tenon part, and the clamping rod is detachably connected with the air outlet cylinders. And a gas channel communicated with the inner cavity of the clamping head and the gas outlet cylinder is formed in the clamping rod, so that gas in the cavity is introduced into the blade. The test device can replace different clamping frames according to different structures of blade tenons, a new processing test device is not needed, and the utilization rate is high.

Description

Technical Field

[0001] This application belongs to the field of testing equipment, and specifically relates to a testing device for the thermal corrosion of combustion gases on turbine blades of a wind turbine engine. Background Technology

[0002] Marine environments contain a large number of salt particles. At high temperatures, sulfur-containing fuel gases react with these salt particles, such as NaCl, to deposit a mixed molten salt film (NaCl, Na2SO4, etc.) on the surface of engine turbine blades. This film dissolves and destroys the normal protective oxides on the surface, leading to thermal corrosion of the turbine blades at high temperatures. Severe thermal corrosion can cause catastrophic accidents, making a scientific and reasonable evaluation of the thermal corrosion resistance of blades and materials particularly important.

[0003] The gas thermal corrosion test is a novel environmental testing and evaluation method. It utilizes a unique nozzle mechanism to uniformly mix and atomize aviation kerosene with simulated seawater, and then fully combust it to form a corrosive medium that acts on the test piece. The gas state is close to the corrosion conditions of the hot-end components of a gas turbine engine operating in a marine environment. It can simulate the marine corrosion environment to the greatest extent under laboratory conditions, and evaluate the thermal corrosion resistance of engine turbine blades and materials.

[0004] While blade material-level specimens can reflect the material's inherent resistance to hot corrosion, blade-level components more accurately reflect the combined hot corrosion resistance of materials, structures, and other factors. HB7740-2004 details the requirements for gas combustion hot corrosion testing methods, procedures, and apparatus, but only provides schematic diagrams of rod and sheet-shaped specimen clamps, which are insufficient for evaluating the hot corrosion resistance of real turbine blades and have poor applicability. Publication CN206594031U proposes a gas combustion hot corrosion testing sheet-shaped material specimen clamp, but this too cannot be used to simulate tests on real turbine blades and other components, significantly limiting research on engine blade corrosion resistance evaluation and life assessment. Therefore, the testing apparatus used is mostly for simply clamping rod and sheet-shaped specimens, which does not support testing the gas combustion hot corrosion resistance of simulated real turbine blades. Furthermore, it cannot be used for comparative tests of the hot corrosion resistance of various blades and materials.

[0005] The existing test equipment cannot control the rotation of the blades.

[0006] Existing experimental setups require the blades to be removed from the combustion furnace for cooling, which cannot realistically simulate the working environment of the blades. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a test apparatus for the thermal corrosion of combustion gases on turbine blades of a wind turbine engine, comprising: a high-temperature furnace, a gas supply device, a fuel tank, a brine tank, a nozzle, a wind turbine test fixture, and blades;

[0008] The nozzle is installed inside the high-temperature furnace, and the gas supply device, fuel tank, and brine tank are all connected to the nozzle.

[0009] The wind turbine test fixture has the freedom to move in and out of the high-temperature furnace. The wind turbine test fixture includes: a wind turbine disc, a drive device for rotating the wind turbine disc, and multiple clamping frames distributed circumferentially on the wind turbine disc. The wind turbine disc has a cavity, and multiple air outlets connected to the cavity are arranged circumferentially. The cavity is connected to an air supply device. One end of the clamping frame is a clamping head, and the other end is a clamping rod. The inner cavity of the clamping head is provided with a slot for connecting the tenon part of the blade. The clamping rod is detachably connected to the air outlet. The inside of the clamping rod has a gas channel connecting the inner cavity of the clamping head and the air outlet, so that the gas in the cavity can be introduced into the blade.

[0010] Preferably, the drive device includes a windmill rod, a bevel gear, and a gearbox. Both the windmill rod and the windmill disc are equipped with bevel gears. The windmill rod and the windmill disc are connected by gears in the gearbox. One end of the windmill rod is driven by a motor.

[0011] Preferably, the clamping rod is provided with an elastic baffle to prevent the blade from slipping out during rotation.

[0012] Preferably, the windmill rod, windmill disc, gearbox, and clamping frame are made of GH4169 or GH536 alloy.

[0013] Preferably, the air supply device and the windmill disc are connected by a rotating transition section. The rotating transition section has an internal gas channel and the interfaces at both ends have rotational freedom, so that the windmill disc can rotate relative to the air supply device when it is ventilated.

[0014] Preferably, the air outlet and the clamping head have external threads, and the clamping rod and the air outlet are connected by a sleeve with internal threads at both ends.

[0015] Preferably, it also includes a control system for controlling the temperature of the high-temperature furnace.

[0016] Preferably, it also includes a control device for controlling the movement of the windmill test fixture.

[0017] The advantages of this application include:

[0018] 1. A real turbine blade combustion thermal corrosion test device is provided, which is simple to install, easy to operate, and provides stable clamping. The test device can be modified with different clamps according to different blade tenon structures, without the need for new testing device processing, thus achieving high utilization.

[0019] 2. It can perform comparative tests on the thermal corrosion performance of turbine blades made of different materials and structures, with high testing efficiency and cost savings.

[0020] 3. The fan-type blade test device can rotate, allowing cooling airflow to pass through the blades, thus more realistically simulating the working environment of the blades. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a test device for thermal corrosion of gas combustion gases on turbine blades of a wind turbine engine.

[0022] Figure 2 This is a schematic diagram of a windmill model test fixture.

[0023] Figure 3 This is a schematic diagram of the clamping frame.

[0024] Figure 4 This is a schematic diagram of the overall fixture for the wind turbine model test after clamping the blades. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] like Figures 1-4 As shown, the purpose of this invention is to provide a stable and highly applicable test device for the thermal corrosion of turbine blades in wind turbine engines. It can realize the thermal corrosion test of real turbine blades with different materials and structures, effectively simulate the thermal corrosion of blades under actual working conditions, and has guiding significance for the design improvement of thermal corrosion test devices and the research on corrosion mechanisms.

[0027] The device structure described in this invention consists of a control system 1, a high-temperature furnace 2, a gas supply device 3, a fuel tank 4, a brine tank 5, a nozzle 6, a windmill model test fixture 7, a control device 8, blades 10, and a sleeve 11.

[0028] The windmill model test device 7 consists of a windmill rod 71, a windmill disc 72, an air outlet 73, bevel gears 74, and a gearbox 75. Two bevel gears 74 are mounted on the head of the windmill rod 71, meshing with each other. To prevent corrosion of the bevel gears 74 by high-temperature combustion gases, the bevel gears 74 are installed in the gearbox 75. The windmill disc 2 has a hollow structure with 8 to 12 evenly distributed air outlets 73 circumferentially arranged, and the outer side of the air outlets 73 has threads.

[0029] The clamping frame 9 consists of a clamping head 91, an elastic baffle 92, and a clamping rod 93. The inner cavity of the clamping head 91 can be designed with a slot size according to the shape of the tenon part of the blade 10. The blade 10 is placed into the slot, and the elastic baffle 92 is used to fix and lock the blade to prevent the blade from moving out during rotation. One end of the clamping rod 93 is provided with an external thread.

[0030] The clamping frame 9, which holds the blade 10, is connected to the air outlet 73 on the windmill disc 72 via a sleeve 11 with internal threads. The windmill disc has a hollow structure, and cooling air is vented through the air outlet to the root of the blade tenon, achieving a cooling effect on the inner cavity and outer surface of the blade.

[0031] The aforementioned windmill rod 71, windmill disc 72, gearbox 75, and clamping frame 9 should be made of high-temperature alloys with excellent heat and corrosion resistance, such as GH4169 and GH536.

[0032] 2. The test methods involved in this device include:

[0033] (1) Start the control system to raise the temperature of the high-temperature furnace to the set test temperature.

[0034] (2) Fuel oil and brine are introduced into the furnace and atomized and mixed by the gas supply device to form mixed gas. After the fuel oil self-ignites, the furnace temperature is tested to stabilize.

[0035] (3) Design the slot size according to the shape of the blade tenon, put the blade into the slot, and use elastic baffles to fix and lock the blade to prevent the blade from moving out during rotation.

[0036] (4) Connect the clamping frame holding the blades to the air outlet on the wind turbine disc through a sleeve with internal threads.

[0037] (5) Install the wind turbine test fixture on the control device, and use the lifting function to send the fixture with blades into the high temperature furnace test area, and use the rotation function to drive the blades to rotate in the furnace.

[0038] (6) Turn on the air supply device to pass cooling air into the fan disk cavity, and cool the blades through the air outlet to effectively simulate the working process of turbine blades in engine combustion gas.

[0039] The technical problems solved by this application include:

[0040] (1) Solve the problem of turbine blade clamping and fixing. The test device can be designed with a clamping frame according to the blade tenon structure. The clamping frame is fixed to the wind turbine disk by a sleeve, which can stably achieve the clamping of the turbine blade.

[0041] (2) Solve the problem of comparative testing of turbine blades with different materials and structures. Multiple clamping frames are designed according to the different structural characteristics of the blades, so that multiple blade comparative tests can be carried out at the same time.

[0042] (3) Solve the blade rotation problem. Design a gear transmission device to control the blade rotation.

[0043] (4) Solve the problem of cooling airflow through the blades. Cooling air is circulated through the exhaust pipe of the wind turbine disc to the blade tenon, thereby achieving the cooling effect on the inner cavity and surface of the blade.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test apparatus for hot corrosion of combustion gases in wind turbine blades of a wind turbine engine, characterized in that, include: High-temperature furnace (2), gas supply device (3), fuel tank (4), brine tank (5), nozzle (6), wind turbine test fixture (7) and blades (10); The nozzle (6) is installed inside the high-temperature furnace (2), and the gas supply device (3), fuel tank (4) and brine tank (5) are all connected to the nozzle (6); The windmill test fixture (7) has the freedom to move in and out of the high-temperature furnace (2). The windmill test fixture (7) includes: a windmill disc (72), a drive device for rotating the windmill disc (72), and multiple clamping frames (9) distributed circumferentially on the windmill disc (72). The windmill disc (72) has a cavity, and multiple air outlets (73) connected to the cavity are arranged circumferentially. The cavity is connected to the air supply device (3). One end of the clamping frame (9) is a clamping head (91), and the other end is a clamping rod (93). The inner cavity of the clamping head (91) is provided with a slot for connecting the tenon part of the blade (10). The clamping rod (93) is detachably connected to the air outlet (73). The inside of the clamping rod (93) has a gas channel connecting the inner cavity of the clamping head (91) and the air outlet (73), so that the gas in the cavity can be introduced into the blade (10).

2. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, include: The drive unit includes a windmill rod (71), a bevel gear (74), and a gearbox (75). Both the windmill rod (71) and the windmill disc (72) are equipped with bevel gears (74). The windmill rod (71) and the windmill disc (72) are connected by gears in the gearbox (75). One end of the windmill rod (71) is driven by a motor.

3. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, include: The clamping rod (93) is provided with an elastic baffle (92) to prevent the blade from moving out during rotation.

4. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, The windmill rod (71), windmill disc (72), gearbox (75) and clamping frame (9) are made of GH4169 or GH536 alloy.

5. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, The air supply device (3) is connected to the windmill disc (72) through a rotating transition section. The rotating transition section has an internal gas channel and the two ends of the interface have rotational freedom, so that the windmill disc (72) can rotate relative to the air supply device (3) when it is ventilated.

6. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, The air outlet (73) and the clamping head (91) have external threads, and the clamping rod (93) and the air outlet (73) are connected by a sleeve (11) with internal threads at both ends.

7. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, It also includes a control system (1) for controlling the temperature of the high-temperature furnace (2).

8. The wind turbine blade combustion gas hot corrosion test apparatus as described in claim 1, characterized in that, It also includes a control device (8) for controlling the movement of the windmill test fixture (7).

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