Gas engine coupled environmental hot corrosion fatigue test apparatus and method of use thereof

Abstract

The application provides a kind of gas heat engine coupling environmental hot corrosion fatigue experimental device and its use method, belong to hot corrosion and fatigue test device technical field, this fatigue experimental device includes testing machine, pull rod module and gas generator.Testing machine is provided with double column, upper crossbeam, and the loading system for providing load for pull rod module;Pull rod module is composed of two sets of same structure of pull rod assembly, one end of upper pull rod assembly is fixed on upper crossbeam, one end of lower pull rod assembly is fixed in testing machine, the other end is used for fixedly connected with upper pull rod assembly Test piece and carry out tensile fatigue test under the driving of loading system;Gas generator is fixed on the rack by vertically arranged double horizontal sliding table, suitable for fuel combustion to produce gas, the generated gas provides hot corrosion gas environment for test piece, wherein the distance and / or angle between gas generator and test piece is controlled by the movement of horizontal sliding table, so as to control the temperature of test piece.

Description

Technical Field

[0001] This application belongs to the technical field of hot corrosion and fatigue testing equipment, and particularly relates to a fatigue testing device for hot corrosion in a gas-fired heat engine coupled environment and its usage method. Background Technology

[0002] With the implementation of the marine strategy, an increasing number of power plants, such as gas turbines, are being used in marine environments. The marine atmosphere contains large amounts of salt and water vapor. Existing research shows that water vapor content significantly affects the mechanism and kinetics of high-temperature thermal corrosion (above 1600℃), increasing the risk of thermal corrosion fatigue damage to high-temperature components such as turbine blades. Furthermore, with the popularization of new energy sources such as natural gas and hydrogen, the number of hydrogen gas turbines used in marine environments is increasing. Compared to traditional petroleum-fueled gas turbines, hydrogen gas turbines have a water vapor content in their fuel gas composition that is more than 10% higher, further exacerbating thermal corrosion damage in hydrogen-powered engines.

[0003] Previously, when studying the thermal corrosion fatigue damage of turbine blades (test specimens), surface salt coating was often used to simulate a marine corrosion environment. However, this method has significant drawbacks. First, the concentration of corrosive media such as salt is high at the beginning of the test, but as the chemical reaction proceeds, the corrosive media is exhausted, and the corrosion rate decreases, showing a distinct parabolic shape on the corrosion kinetic curve. In reality, salt in the environment continuously adheres to the sample surface, providing fresh corrosive media for the corrosion process. Second, when turbine blades are running in the engine, they are continuously eroded by the exhaust gas. Surface corrosion products are detached due to the continuous and higher-speed erosion, and the fresh material surface comes into direct contact with the corrosive media, resulting in a chemical reaction and a higher corrosion rate. Since thermal corrosion damage acts as a crack initiation source, reducing the fatigue initiation life, and fatigue damage generates cracks, destroying the surface oxide layer, causing the fresh surface to continuously come into contact with the corrosive media, promoting corrosion. These two factors interact, further reducing the fatigue life. Therefore, developing a thermal corrosion fatigue testing device for a gas-heat engine coupled environment can better and more accurately study the thermal corrosion-fatigue coupled damage mechanism, which is of great significance for turbine blade life design and the development of efficient and clean power plants. Summary of the Invention

[0004] In view of this, this application provides a fatigue testing apparatus for thermal corrosion in a gas-fired heat engine coupled environment and a method for using it, in order to at least partially solve the above-mentioned technical problems.

[0005] As a first aspect of this application, a fatigue testing apparatus for thermal corrosion in a gas-fired heat engine coupled environment is provided, comprising:

[0006] The testing machine is equipped with a main frame containing two columns, an upper crossbeam connecting the two columns, and a loading system that provides loads to the tie rod module;

[0007] The tie rod module consists of two sets of tie rod assemblies with the same structure. One end of the upper tie rod assembly is fixed to the upper crossbeam, and one end of the lower tie rod assembly is fixed inside the testing machine. The other end of the lower tie rod assembly, together with the upper tie rod assembly, is used to fix and connect the test piece and perform dynamic tensile load fatigue test under the drive of the loading system.

[0008] The gas generator is fixed on the frame by two vertically arranged horizontal slides. The gas generator is suitable for producing gas by fuel combustion. The produced gas provides a hot corrosion gas environment for the test piece. The distance and / or angle between the gas generator and the test piece is controlled by the movement of the horizontal slides, thereby controlling the temperature of the test piece.

[0009] In some embodiments, the gas generator includes:

[0010] The combustion chamber includes a housing consisting of an outer casing of the combustion chamber and a front cover plate of the combustion chamber, and a flame tube located inside the housing;

[0011] The cyclone separator is fixed to the head of the flame tube by a cyclone separator cover plate;

[0012] The dual-fuel nozzle is inserted into the combustion chamber through a pre-reserved through hole on the front cover plate of the combustion chamber, and the nozzle end of the dual-fuel nozzle extends into the interior of the swirler through the central hole of the swirler. The internal space of the dual-fuel nozzle is provided with a first fuel channel and a second fuel channel that are independent of each other.

[0013] The first fuel pipe and the second fuel pipe are in fluid communication with the internal space of the dual fuel nozzle;

[0014] Multiple first air inlets are located on the outer casing of the combustion chamber. After the first air enters the combustion chamber through the first air inlet, it forms a gas film that surrounds the flame tube. At the same time, the first air surrounding the flame tube flows back and enters the cyclone separator through the air hole on the cyclone separator cover plate, where it mixes with the first fuel and the second fuel. The resulting atomized mixture enters the flame tube.

[0015] The igniter is fixedly mounted on the combustion chamber, with one end passing through the outer casing of the combustion chamber and inserted into the interior of the flame tube to ignite the atomized mixture.

[0016] In some embodiments, the gas generator further includes: a discharge chamber located downstream of the flame tube, the discharge chamber including an outer discharge chamber and an outlet section located inside the outer discharge chamber, the outlet section communicating with the flame tube, and the outlet section being provided with a gas outlet for high-temperature gas generated by combustion of the atomized mixture, the gas outlet being located on the horizontal central axis of the flame tube and the outlet section.

[0017] In some embodiments, the gas generator further includes a secondary combustion chamber disposed between the combustion chamber and the exhaust chamber. The secondary combustion chamber includes an outer casing for the secondary combustion chamber and a secondary combustion section located inside the outer casing for the secondary combustion chamber. The secondary combustion section communicates with the flame tube and the outlet section.

[0018] In some embodiments, the outer casing of the secondary combustion chamber is provided with multiple second air inlets, through which second air enters the secondary combustion section to ensure complete combustion of the atomized mixture.

[0019] In some embodiments, the exhaust chamber is also provided with: a brine inlet and / or a dust inlet; and a thermocouple for monitoring the temperature of the gas.

[0020] In some embodiments, the testing machine is also equipped with a slide bracket and an auxiliary heating furnace. The slide bracket is fixed to the double columns of the testing machine, and a linear slide rail is provided on the slide bracket. Two lower crossbeams are installed on the linear slide rail. The auxiliary heating furnace adopts a two-part split design, with each half fixed to one of the two lower crossbeams on the linear slide rail. The two lower crossbeams move back and forth along the linear slide rail to realize the opening and closing of the auxiliary heating furnace.

[0021] In some embodiments, the fatigue testing apparatus further includes a monitoring bracket, fixed on any horizontal slide, for supporting the monitoring equipment.

[0022] In some embodiments, the auxiliary heating furnace includes a furnace body, a furnace cavity, and tie rod holes. The furnace body is composed of an insulation bushing, which includes an outer liner and an inner liner from the outside to the inside. The furnace cavity is provided with at least four sets of heating rods, which are arranged non-equidistantly to provide a heating environment. The tie rod holes are located at the top and bottom of the auxiliary heating furnace so that the test piece passes through the insulation bushing of the auxiliary heating furnace and directly into the furnace cavity.

[0023] In some implementations, a lifting base for supporting the gas generator is provided on the double horizontal slide. By controlling the height of the lifting base and the direction of movement of the double horizontal slide, the auxiliary heating furnace can be adapted to different heights and positions.

[0024] In some embodiments, a gas inlet and two observation windows are provided on one side of the auxiliary heating furnace body, and an exhaust pipe is provided on the other side of the furnace body. The gas inlet is aligned with the gas outlet of the test piece and the gas generator, and the angle between the gas inlet and the heating rod is 60°. The observation windows are arranged symmetrically on both sides of the gas inlet, facing the center of the auxiliary heating furnace, and the angle between the observation windows and the gas inlet is 30°.

[0025] In some implementations, the tie rod assembly consists of a main connector, a high-temperature alloy connector, and a directional alloy connector connected in sequence.

[0026] In some embodiments, a cooling water through hole is provided inside the high-temperature alloy joint, on which a straight quick-connect fitting is installed as a cooling water channel, and a cold air inlet is provided at the root of the high-temperature alloy joint on one side away from the main joint.

[0027] In some embodiments, the oriented alloy joint is fixedly connected to the test piece. The oriented alloy joint has a first hollow structure inside, which serves as a channel for cold air to cool the oriented alloy joint and the test piece. The test piece has a second hollow structure, and a cold air outlet is provided in the middle of the test piece. The cold air inlet, the first hollow structure, the second hollow structure, and the cold air outlet are located on the same central axis.

[0028] In some embodiments, one end of the main connector is connected to the testing machine via a thread; the other end of the main connector is a concave interface, and one end of the high-temperature alloy connector is inserted into the concave interface and fixed with a locating pin; an internal thread is provided at the end of the high-temperature alloy connector opposite to the one connected to the main connector, and is threadedly connected to the external thread provided at one end of the directional alloy connector, and the internal thread provided at the other end of the directional alloy connector is threadedly connected to the external thread of the test piece.

[0029] As a second aspect of this application, a method of using the above-described fatigue testing apparatus is provided, comprising:

[0030] The test specimen is fixed by the upper and lower tie rod assemblies in the tie rod module. One end of the upper tie rod assembly is fixed to the upper crossbeam of the testing machine, and one end of the lower tie rod assembly is fixed to the testing machine. Dynamic tensile load fatigue test is performed under the drive of the loading system set in the testing machine. The gas generator is fixed on the vertically arranged double horizontal slide on the frame. Fuel is introduced into the gas generator for combustion to produce gas, which provides a hot corrosion gas environment for the test specimen. The distance and / or angle between the gas generator and the test specimen is controlled by controlling the movement of the vertically arranged double horizontal slide, thereby controlling the temperature of the test specimen. Combined with the cyclic loading of the load, the hot corrosion-mechanical fatigue test of the test specimen is realized.

[0031] In this application, the combined action of a testing machine equipped with a loading system, a tie rod module, and a gas generator achieves thermo-mechanical-chemical gas coupling, enabling the reproduction of the real service environment of the test piece (such as a turbine blade). Furthermore, the fatigue testing device of this application can also be used to simulate accelerated life testing of high-temperature alloy blades (above 1600℃), simulate mechanical load thermal cycling / thermal shock testing of thermal barrier coatings, simulate thermal corrosion fatigue testing, and assess the reliability of high-temperature components in hydrogen power plants. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the fatigue test apparatus for thermal corrosion in a gas-fired heat engine coupled environment according to the first embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the gas generator assembly for this application;

[0034] Figure 3 for Figure 2 Vertical cross-sectional view of a gas generator;

[0035] Figure 4 for Figure 2 Horizontal cross-sectional view of a gas generator;

[0036] Figure 5 for Figure 4 A partial enlarged view of the connection between the dual-fuel nozzle and the cyclone separator;

[0037] Figure 6 This is a schematic diagram of the assembly of the tie rod module in this application;

[0038] Figure 7 for Figure 6 The main view;

[0039] Figure 8 for Figure 6 Cross-sectional view;

[0040] Figure 9 This is a first-view perspective view of the fatigue test apparatus for thermal corrosion in a gas-heat engine coupled environment according to the second embodiment of this application.

[0041] Figure 10 This is a second-view perspective view of the fatigue test apparatus for thermal corrosion in a gas-heat engine coupled environment according to the second embodiment of this application.

[0042] Figure 11 A first-person perspective view of the assembly of the auxiliary heating furnace and the linear guide rail;

[0043] Figure 12 A second-view perspective perspective view of the assembly of the auxiliary heating furnace and the linear guide rail;

[0044] Figure 13 for Figure 12 Cross-sectional view;

[0045] Figure 14 This is a third-view view of the fatigue test apparatus for thermal corrosion of a gas-fired heat engine coupled with an environment according to the second embodiment of this application.

[0046] [Attached image labels]

[0047] 100-Gas generator; 11-Combustion chamber; 111-Outdoor combustion chamber casing; 112-Front cover of combustion chamber; 113-First air inlet; 114-Air hole; 12-Dual fuel nozzle; 121-First fuel passage; 122-Second fuel passage; 13-Flame tube; 131-Premixing zone; 132-Main combustion zone; 133-Secondary combustion zone; 14-Swirl generator; 141-Swirl generator cover; 15-Igniter; 16-Secondary combustion chamber; 161-Secondary air inlet; 162-Outdoor combustion chamber casing; 163-Secondary combustion section; 17-Emission chamber; 171-Brine inlet; 172-Dust inlet; 173-Thermocouple; 174-Outdoor emission chamber casing; 18-Fixed support; 19-Bolt; 101-First fuel pipe; 102-Secondary fuel pipe;

[0048] 200-Pull rod module, 21-Main connector, 22-High temperature alloy connector, 23-Oriented alloy connector, 24-Test piece, 201-Positioning pin, 202-Cold air inlet, 203-Cold air outlet, 204-Cooling water through hole, 205-Thread, 206-First hollow structure, 207-Second hollow structure;

[0049] 300-Testing machine, 301-Column, 302-Upper crossbeam, 303-Linear slide rail, 304-Limit ring, 305-Column bracket, 306-Lower crossbeam, 307-Slide table bracket;

[0050] 400-Rack, 401-Horizontal slide, 402-Lifting base, 403-Drag chain;

[0051] 500-Auxiliary heating furnace, 501-Exhaust pipe, 502-Observation window, 503-Gas inlet, 504-Pull rod hole, 505-Inner lining, 506-Outer lining, 507-Heating rod;

[0052] 600-Monitoring Stand;

[0053] A - First fuel, B - First air, C - Second air, D - Gas fuel, E - Cooling water, F - Cold air. Detailed Implementation

[0054] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0055] The fatigue testing apparatus of this application includes: a testing machine, a tie rod module, a test piece, and a gas generator.

[0056] The testing machine is equipped with a main frame containing two columns, an upper crossbeam connecting the two columns, and a loading system that provides loads to the tie rod module.

[0057] The tie rod module consists of two sets of tie rod assemblies with the same structure. One end of the upper tie rod assembly is fixed to the upper crossbeam, and one end of the lower tie rod assembly is fixed inside the testing machine. The other end of the lower tie rod assembly, together with the upper tie rod assembly, is used to fix and connect the test piece and perform dynamic tensile load fatigue test under the drive of the loading system.

[0058] The gas generator is fixed on the frame by two vertically arranged horizontal slides. The gas generator is suitable for producing gas by fuel combustion. The produced gas provides a hot corrosion gas environment for the test piece. The distance and / or angle between the gas generator and the test piece is controlled by the movement of the horizontal slides, thereby controlling the temperature of the test piece.

[0059] In this application, the test specimen is fixedly connected to the upper tie rod assembly and the lower tie rod assembly, respectively. The upper tie rod assembly is fixed to the upper crossbeam of the testing machine, and the lower tie rod assembly is fixed inside the testing machine. A loading system installed inside the testing machine drives the tie rod module to perform reciprocating tensile motion and load. A gas generator ignites fuel, and the generated gas provides a hot corrosion gas environment for the test specimen. Through mechanical load loading, gas erosion, and hot corrosion, a coupled thermo-mechanical-chemical complex environment is constructed to reproduce the real service environment of the test specimen (such as a turbine blade), achieving different damage simulations such as hot corrosion fatigue, creep, and creep-fatigue interaction. Furthermore, the fatigue testing device of this application can also be used to simulate accelerated life testing of high-temperature alloy blades, simulate mechanical load thermal cycling / thermal shock testing of thermal barrier coatings, simulate hot corrosion fatigue testing, and assess the reliability of high-temperature components in hydrogen power plants.

[0060] The fatigue test apparatus for thermal corrosion in a gas-fired heat engine coupled environment of this application is described in detail below with reference to the specific accompanying drawings.

[0061] Figure 1 This is a schematic diagram of the fatigue test apparatus for thermal corrosion in a gas-fired heat engine coupled environment according to the first embodiment of this application.

[0062] like Figure 1 As shown, the fatigue testing apparatus of this application includes: a testing machine 300, a tie rod module 200, and a gas generator 100.

[0063] The testing machine 300 includes a main frame with double columns 301, an upper crossbeam 302 connecting the double columns 301, and a loading system that provides load to the tie rod module 200. Displacement and force sensors are installed within the main frame to detect the displacement and force of the test specimen 24 during the reciprocating tensile process under mechanical load. A hydraulic pump is installed in the loading system to provide force to the test specimen.

[0064] A gas generator 100 is a device for producing gas through fuel combustion, and the produced gas provides a thermal corrosion environment for the test specimen 24. The gas generator 100 is fixed to the frame 400 by two vertically arranged horizontal slides 401. The distance and / or angle between the gas generator 100 and the test specimen 24 is controlled by the left and right movement of the horizontal slides 401, thereby controlling the temperature of the test specimen 24. The vertically arranged double horizontal slides 401 include a horizontal slide 401 in the X-axis direction and a horizontal slide 401 in the Y-axis direction. By controlling the movement of the horizontal slides 401 along the X-axis direction, the gas outlet of the gas generator 100 can be controlled to move left and right, thereby controlling whether the gas released by the gas generator 100 is directly aimed at the test specimen 24 for heating. When the horizontal slides 401 move a large distance along the X-axis, the gas is no longer directly aimed at the test specimen 24, and the test specimen 24 begins to cool down. Therefore, by controlling the relative position of the gas outlet and the test piece 24, a heating-cooling-heating cycle of the test piece 24 can be achieved. Combined with the load loading-unloading-loading of the testing machine 300, a combined thermo-mechanical cycle can be realized, thus simulating the engine start-stop cycle. When the horizontal slide 401 moves along the Y-axis, the distance between the gas D and the test piece 24 can be adjusted, thereby adjusting the surface temperature of the test piece 24, achieving a high-temperature (1600℃) - low-temperature (room temperature) cycle. Combined with the movement of the horizontal slide 401 along the X-axis and the load loading-unloading of the testing machine 300, a combined cycle mode of high-temperature - low-temperature - cooling temperature cycle and high-load - low-load force cycle can be achieved, simulating the actual load conditions of the turbine blades under the complete flight envelope of the engine. Furthermore, a lifting base 402 for supporting the gas generator 100 is provided on the dual horizontal slide 401. By controlling the height of the lifting base 402, alignment with the test piece 24 can be achieved. Simultaneously, the temperature of the test piece 24 can be controlled by combining the left and right movement direction and distance of the dual horizontal slide 401. Thus, the gas generator 100 of this application can move relatively freely in three-dimensional space through the vertically arranged double horizontal slides 401 and lifting base 402.

[0065] The gas generator 100 of this application can be designed with dual fuel or single fuel, and the fuel can be liquid fuel and / or gaseous fuel to meet the requirements of different composition gas atmospheres.

[0066] Figure 2 This is a schematic diagram of the gas generator assembly for this application. Figure 3 for Figure 2 Vertical cross-sectional view of a gas generator. Figure 4 for Figure 2 Horizontal cross-sectional view of a gas generator; Figure 5 for Figure 4 A magnified view of the connection between the dual-fuel nozzle and the cyclone separator.

[0067] like Figures 2-4 As shown, the gas generator of this application includes: a dual fuel nozzle 12, a combustion chamber 11, a swirler 14, a first fuel pipe 101, a second fuel pipe 102, multiple first air inlets 113, and an igniter 15.

[0068] Specifically, the combustion chamber 11 is a chamber in which fuel (including first fuel A and second fuel) mixes with air to generate high-temperature combustion gas D. The combustion chamber 11 of this application includes a housing consisting of an outer combustion chamber casing 111 and a combustion chamber front cover plate 112, and a flame tube 13 located inside the housing. The outer combustion chamber casing 111 and the combustion chamber front cover plate 112 are connected by bolts 19. To ensure the airtightness of the outer combustion chamber casing 111 and the combustion chamber front cover plate 112, an asbestos gasket is used to seal the connection.

[0069] Combination Figures 3-5 As shown, the cyclone separator 14 is installed at the head of the flame tube 13 and fixed by the cyclone separator cover plate 141. Specifically, the cyclone separator 14 is provided with a cyclone separator cover plate 141, which is connected to the flange of the flame tube 13 by bolts 19. The cyclone separator 14 is fixed to the head of the flame tube 13 by the flange and fixed by the cyclone separator cover plate 141.

[0070] The dual-fuel nozzle 12 is inserted into the combustion chamber 11 through a pre-reserved through hole on the combustion chamber front cover plate 112, and the nozzle end of the dual-fuel nozzle 12 extends into the swirler 14 through the central hole of the swirler 14. The internal space of the dual-fuel nozzle 12 is provided with a first fuel channel 121 and a second fuel channel 122 that are independent of each other.

[0071] The first fuel pipe 101 and the second fuel pipe 102 are in fluid communication with the internal space of the dual-fuel nozzle 12. Specifically, the first fuel pipe 101 and the second fuel pipe 102 are arranged perpendicularly to each other outside the dual-fuel nozzle 12. The internal space of the dual-fuel nozzle 12 is coaxially provided with a first fuel channel 121 and a second fuel channel 122 (i.e., the dual-fuel nozzle 12 has inner and outer fuel channels). The first fuel pipe 101 is in fluid connection with the first fuel channel 121 inside the dual-fuel nozzle 12, and the second fuel pipe 102 is in fluid connection with the second fuel channel 122 inside the dual-fuel nozzle 12. This allows the first fuel A and the second fuel to be fed into the dual-fuel nozzle 12 through independent channels, and then ejected from the nozzle end of the dual-fuel nozzle 12, before entering the interior of the cyclone separator 14 and the flame tube 13 through the central hole of the cyclone separator 14. It should be noted that the arrangement of the first fuel channel 121 and the second fuel channel 122 is not limited to this. Figures 2-5 The vertical arrangement is shown. Furthermore, the first fuel channel 121 can serve as the inner or outer layer of the dual-fuel nozzle 12, and similarly, the second fuel channel 122 can serve as the outer or inner layer of the dual-fuel nozzle 12. The first and second fuels used in this application can be the same or different, each independently selected from liquid fuels or gaseous fuels. For example, the liquid fuel can be methanol, and the gaseous fuel can be hydrogen, methane, etc.

[0072] Multiple first air inlets 113 are disposed on the outer casing 111 of the combustion chamber. First air B enters the combustion chamber 11 through the first air inlets 113 and forms a gas film enveloping the flame tube 13, cooling the flame tube 13. Simultaneously, the first air B enveloping the flame tube 13 flows back and passes through air holes 114 on the cyclone separator cover plate 141 (e.g., ...). Figure 5 (As shown) It enters the cyclone separator 14 for pre-swirl and mixes with the first fuel A and the second fuel. The resulting atomized mixture enters the flame tube 13.

[0073] Igniter 15 is fixedly mounted on combustion chamber 11, and one end of it passes through outer casing 111 of combustion chamber and is inserted into the interior of flame tube 13 to ignite atomized mixture.

[0074] In this application, the first fuel channel 121 and the second fuel channel 122 are respectively fluidly connected to the first fuel pipe 101 and the second fuel pipe 102 to introduce different fuels into the dual-fuel nozzle 12. The dual-fuel nozzle 12 is inserted into the flame tube 13 of the combustion chamber 11 so that the first fuel and the second fuel enter the combustion chamber 11 through the first fuel channel 121 and the second fuel channel 122 respectively for mixing. First air B enters the combustion chamber 11 through multiple first air inlets 113, wrapping the flame tube 13 to form a gas film and cooling the flame tube 13. At the same time, the first air B flows back and enters the cyclone separator 14 through the air holes 114 on the cyclone separator cover plate 141, where it mixes with the first fuel and the second fuel entering the cyclone separator 14 to form an atomized mixture. Finally, the atomized mixture is ignited by the igniter 15 provided in the combustion chamber 11, and the mixture burns to produce high-temperature gas D. The gas generator 100 provided in this application can ignite different fuels, has strong fuel versatility, and provides different high-temperature and gas environments for test pieces. The first air B used in this application is high-pressure air with a pressure of 0.8MPa-1MPa.

[0075] Furthermore, along the fuel flow direction, the flame tube 13 of this application is sequentially divided into a premixing zone 131, a main combustion zone 132, and a secondary combustion zone 133, wherein the aforementioned igniter 15 can be located in the main combustion zone 132. The premixing zone 131 of this application adopts a constant diameter section design (inner diameter of 53mm), the main combustion zone 132 adopts an expanded diameter section design, and the inner diameter of the secondary combustion zone 133 is larger than the inner diameter of the premixing zone 131. By using a smaller inner diameter in the premixing zone 131, the first fuel, the second fuel, and air mixed by the swirling flow separator 14 are facilitated to be fully mixed within the premixing zone 131, forming a higher-velocity atomized mixture. Subsequently, the accelerated atomized mixture enters the expanded diameter section of the main combustion zone 132 and is rapidly ignited by the igniter 15 located in this area, resulting in combustion of a higher-temperature and higher-velocity gas D.

[0076] In some embodiments, the gas generator of this application further includes a discharge chamber 17, located downstream of the combustion chamber 11. The discharge chamber 17 includes an outer discharge casing 174 and an outlet section located inside the outer discharge casing 174. The outer combustion casing 111, the casing of the flame tube 13, and the outer discharge casing 174 are fixedly connected by bolts 19, and the connection is sealed with an asbestos gasket to ensure airtightness and prevent gas leakage. The outlet section adopts a constricted design, communicating with the flame tube 13, and is provided with a gas outlet for discharging the gas D formed by the combustion of the atomized mixture. This gas outlet is located on the horizontal central axis of the flame tube 13 and the outlet section, so as to discharge the higher-temperature and higher-velocity gas D from the gas outlet. The diameter of the gas outlet is approximately 25 mm, which facilitates increasing the gas velocity to form high-temperature, high-speed gas.

[0077] In some implementations, such as Figures 2-5 As shown, to ensure complete combustion of the atomized mixture and increase the flow rate of the gas D, the gas generator of this application further includes a secondary combustion chamber 16 disposed between the combustion chamber 11 and the exhaust chamber 17. The secondary combustion chamber 16 includes a secondary combustion chamber outer casing 162 and a secondary combustion section 163 located inside the secondary combustion chamber outer casing 162. The secondary combustion chamber outer casing 162 is connected to the combustion chamber outer casing 111 and the exhaust chamber outer casing 174 by bolts 19, and the connection is sealed with an asbestos gasket to prevent gas D leakage. Furthermore, the secondary combustion chamber outer casing 162 is provided with multiple second air inlets 161. Second air C enters the secondary combustion section 163 through the second air inlets 161. The secondary combustion section 163 is integrated with the flame tube 13 and the outlet section, forming a single structure. At this time, the atomized mixture that has not been fully combusted in the flame tube 13 enters the secondary combustion section 163, mixes with the second air C, and combusts to form gas D with a higher temperature and velocity. It should be noted that, in the case where the gas generator also includes a secondary combustion chamber 16, the premixing zone 131 of the flame tube 13 of this application adopts an equal diameter section design (inner diameter of 53mm), the outlet section adopts a constricted design (gas outlet inner diameter of 25mm), the main combustion zone 132 adopts an expanded diameter section design, the secondary combustion zone 133 has the same diameter as the secondary combustion section 163, and the igniter 15 is set in the main combustion zone 132 of the flame tube 13 in order to form gas D with higher temperature and velocity.

[0078] In some embodiments, the gas generator 100 is provided with an injection port for adding salt solution or dust particles to further adjust the gas composition and the concentration of particulate matter to be flushed out. Specifically, such as Figures 2-5 As shown, the emission chamber 17 of this application is further provided with a salt solution inlet 171 and / or a dust inlet 172. The number of salt solution inlets 171 and / or dust inlets 172 can be one, two, or more, flexibly configured according to actual needs. Preferably, two or more salt solution inlets 171 and / or dust inlets 172 are symmetrically or evenly arranged. A salt solution (such as sodium chloride solution or sulfate solution) can be delivered to the fuel gas D through the salt solution inlet 171 via a pump to change the composition of the fuel gas D and achieve high-temperature thermal corrosion. Alternatively, CMAS (calcium oxide-magnesium oxide-alumina-silicate) dust can be delivered to the fuel gas D through the dust inlet 172 via a gas pump to change the composition of the fuel gas D and achieve dust scouring. Thus, by introducing water, salt solution, or dust particles into the fuel gas D through the salt solution inlet 171 and / or dust inlet 172, this application can further adjust the fuel gas composition and the concentration of scouring particles.

[0079] In some implementations, continue as Figures 2-5As shown, the discharge chamber 17 is also equipped with a thermocouple 173 for monitoring the temperature of the gas D. The thermocouple 173 used in this application can be an S-type thermocouple, which can be installed on the upper side of the outlet section and / or inserted into the gas D from the left side of the outlet section to measure the temperature of the gas D discharged from the outlet section and calculate the flow rate of the gas D. If the temperature or flow rate of the gas D does not meet the test requirements, a second air C can be introduced into the secondary combustion chamber 16 to ensure complete combustion of the atomized mixture, thereby increasing the temperature and flow rate of the gas D discharged from the outlet section. The second air C is high-pressure air with a pressure of 0.8 MPa-1 MPa.

[0080] In some implementations, continue as Figures 2-5 As shown, the gas generator 100 of this application further includes a fixed support 18 for supporting the combustion chamber 11. The fixed support 18 is fixed on the lifting base 402 so that the height of the gas generator 100 can be adjusted by adjusting the lifting of the lifting base 402, thereby adjusting the alignment of the gas generator 100 with the test piece and the temperature of the test piece.

[0081] Figure 6 This is a schematic diagram of the tie rod module assembly for this application. Figure 7 for Figure 6 The main view, Figure 8 for Figure 6 Cross-sectional view.

[0082] Combination Figure 1 and Figures 6-8 As shown, the tie rod module 200 consists of two sets of tie rod assemblies with the same structure. One end of the upper tie rod assembly is fixed to the upper crossbeam 302, and one end of the lower tie rod assembly is fixed inside the testing machine 300. The other end of the lower tie rod assembly, together with the upper tie rod assembly, is used to fix and connect the test piece 24 and perform dynamic tensile load fatigue test under the drive of the loading system.

[0083] The tie rod assembly of this application consists of a main connector 21, a high-temperature alloy connector 22, and a directional alloy connector 23 connected in sequence. The directional alloy connector 23 in the upper tie rod assembly and the lower tie rod assembly is fixedly connected to the test piece 24. The material of the high-temperature alloy connector 22 can be selected from GH3536 alloy, and the material of the directional alloy connector 23 can be DZ22 alloy.

[0084] Specifically, one end of the main connector 21 is connected to the force sensor of the testing machine via a thread 205 (such as an external thread), and the force sensor is fixed on the upper crossbeam 302; the other end of the main connector 21 is a concave interface, which serves as the connection point with the high-temperature alloy connector 22. After one end of the high-temperature alloy connector 22 is inserted into the concave interface, it is fixed with a locating pin 201. An internal thread is provided on the end of the high-temperature alloy connector 22 that is opposite to the one connected to the main connector 21, and it is threaded 205 to the external thread provided on one end of the directional alloy connector 23. The internal thread provided on the other end of the directional alloy connector 23 is threaded 205 to the external thread of the test piece 24.

[0085] Furthermore, a cold air inlet 202 is provided at the root of the internal thread on the side of the high-temperature alloy joint 22 facing away from the main joint 21. The interior of the directional alloy joint 23 has a first hollow structure 206, which serves as a channel for cold air F. The test piece 24 has a second hollow structure 207, and a cold air outlet 203 is provided in the middle of the test piece 24. The cold air inlet 202, the first hollow structure 206, the second hollow structure 207, and the cold air outlet 203 are located on the same central axis. By injecting cold air F into the cold air inlet 202, the cold air F passes through the first hollow structure 206 and the second hollow structure 207 to cool the directional alloy joint 23 and the test piece 24. The test piece 24 of this application is a specially designed structural feature simulation part, which is a hollow structure, and a cold air outlet 203 is designed in the middle of the test piece 24. The test piece 24 is heated externally by high-temperature combustion gas D and internally by cold gas F introduced from the tie rod assembly, forming a temperature gradient distribution of external heat and internal cold, which can simulate the temperature gradient of the internally cooled blades in the engine.

[0086] Furthermore, a cooling water through hole 204 is provided inside the high-temperature alloy joint 22, and a straight quick-connect fitting is installed on it as a cooling water channel. Cooling water E flows in from one side and flows out from the other side. By injecting cooling water E into the cooling water channel, the high-temperature alloy joint 22 is cooled down to prevent heat from being transferred to the force sensor and damaging the testing machine 300.

[0087] In some embodiments, the fatigue testing apparatus of this application further includes a monitoring bracket 600, fixed on any horizontal slide 401, for supporting monitoring equipment. The monitoring bracket 600 and the supported monitoring equipment can move together with the gas generator 100. The monitoring equipment fixed on the monitoring bracket 600 can be selected from infrared thermal imagers, video extensometers, etc., and can measure the temperature and strain on the surface of the test piece 24.

[0088] As Figure 1 As an alternative shown in the second embodiment of this application, an auxiliary heating furnace is also provided on the test machine 300 so that the temperature of the gas D can reach the temperature of an advanced engine (e.g., above 1600°C).

[0089] Figure 9 This is a first-view perspective view of the fatigue testing apparatus for thermal corrosion in a gas-fired heat engine coupled environment according to the second embodiment of this application. Figure 10 This is a second-view perspective view of the fatigue testing apparatus for thermal corrosion in a gas-fired heat engine coupled environment according to the second embodiment of this application. Figure 11 A first-person perspective perspective view of the assembly of the auxiliary heating furnace and the linear guide rail. Figure 12 A second-view perspective perspective view of the assembly of the auxiliary heating furnace and the linear guide rail. Figure 13 for Figure 12 Cross-sectional view, Figure 14 This is a third-view view of the fatigue test apparatus for thermal corrosion of a gas-fired heat engine coupled with an environment according to the second embodiment of this application.

[0090] like Figures 9-14 As shown, the testing machine of this application is also equipped with a slide table bracket and an auxiliary heating furnace 500.

[0091] Specifically, the testing machine 300 of this application has a column bracket 305 on each of its two columns 301, and a limit ring 304 is installed on each column bracket. The auxiliary heating furnace 500 is fixed to the double column bracket 305 of the testing machine 300 via a slide bracket 307. The height of the auxiliary heating furnace 500 is changed by adjusting the position of the limit ring 304 so that the gas outlet of the gas generator 100 is aligned with the gas inlet 503 on the auxiliary heating furnace 500. The movement of the slide bracket 307 is restricted by tightening the screws on the column bracket 305. A linear slide rail 303 is provided on the slide bracket 307, and two lower crossbeams 306 are installed on the linear slide rail 303. The auxiliary heating furnace 500 adopts a two-part split design, which is fixed to the two lower crossbeams 306 of the linear slide rail 303 respectively. The two lower crossbeams 306 move back and forth along the linear slide rail 303 to realize the opening and closing of the auxiliary heating furnace 500. The lifting base 402, which is provided on the double horizontal slide 401 to support the gas generator 100, is used to adapt to different heights and positions of the auxiliary heating furnace 500 by controlling the height of the lifting base 402 and the moving direction of the double horizontal slide 401.

[0092] The auxiliary heating furnace 500 includes a furnace body, a furnace cavity, and tie rod holes 504. The furnace body is composed of an insulation bushing, which includes an outer liner 506 and an inner liner 505 from the outside to the inside, to achieve heat insulation. At least four sets of heating rods 507 are arranged non-equidistantly inside the furnace cavity to provide a heating environment. The tie rod holes 504 are located at the top and bottom of the auxiliary heating furnace 500 so that the test piece 24, which is fixed by the upper tie rod assembly and the lower tie rod assembly, passes through the auxiliary heating furnace 500. The insulation bushing of the 0 extends directly into the furnace cavity of the auxiliary heating furnace 500, while the other end of the pull rod assembly extends out of the furnace cavity and is fixed to the testing machine 300 by threads. The test piece is then heated by the combined thermal radiation of the heating rod 507 and the gas D, ensuring that the gas D temperature reaches the advanced engine temperature (above 1600℃). Simultaneously, the reciprocating motion of the pull rod module simulates different damage patterns of the test piece 24 under hot gas corrosion, including fatigue, creep, and creep-fatigue interaction. In this application, the heating rod 507 can be a U-shaped heating rod, and the number is not limited. Figure 13 The four sets shown in the figure; the diameter of the tie rod hole 504 at the top and bottom of the auxiliary heating furnace 500 can be 60mm, and the size of the tie rod hole 504 can be flexibly adjusted according to the size of the upper tie rod assembly and the lower tie rod assembly.

[0093] Furthermore, a gas inlet 503 and two observation windows 502 are reserved on one side of the auxiliary heating furnace 500, and an exhaust pipe 501 is provided on the other side of the furnace body. The gas inlet 503 is aligned with the gas outlet of the test piece 24 and the gas generator 100 to ensure the test temperature of the test piece 24. The observation windows 502 are symmetrically arranged on both sides of the gas inlet 503, facing the center of the auxiliary heating furnace 500, and the angle between the observation windows 502 and the gas inlet 503 is 30° to ensure that the maximum surface area of ​​the test piece 24 can be fully seen through the observation windows 502, while not affecting the passage of gas D. The material of the observation windows 502 in this application can be sapphire material with higher temperature resistance. In addition, in order to avoid the heating rods 507 affecting the observation of the observation windows 502, the heating rods 507 are not only arranged at non-equal intervals, but the angle between the heating rods 507 and the gas inlet 503 is also controlled at 60°. Furthermore, the monitoring bracket 600, fixed on any horizontal slide 401, can also move along with the gas generator 100. The monitoring equipment (such as an infrared thermal imager, video extensometer, etc.) fixed on the monitoring bracket 600 can measure the temperature and strain of the test piece 24 surface through the observation window 502. After the test, the gas D, dust and / or salt spray are discharged from the auxiliary heating furnace 500 through the exhaust pipe 501.

[0094] Continue to combine Figures 9-14As shown, the vertically arranged double horizontal slides 401 include a horizontal slide 401 in the X-axis direction and a horizontal slide 401 in the Y-axis direction. The gas generator 100 is fixed to the frame 400 via the vertically arranged double horizontal slides 401. One end of the cable chain 403 is fixed to the horizontal slide 401 in the X-axis direction, and the other end is fixed to the frame 400. The cable chain 403 is internally arranged with pipes and circuits. The distance and / or angle between the gas generator 100 and the test piece 24 is controlled by the movement of the horizontal slides 401, thereby controlling the temperature of the test piece 24. Specifically, by controlling the movement of the horizontal slides 401 along the X-axis direction, the gas outlet of the gas generator 100 can be controlled to move left and right, thereby controlling whether the gas released by the gas generator 100 is directly heating the test piece 24. When the horizontal slides 401 move a large distance along the X-axis, the gas is no longer directly facing the test piece 24, and the test piece 24 begins to cool down. When the horizontal slide 401 moves along the Y-axis, the distance between the gas D released by the gas generator 100 and the test piece 24 can be adjusted, thereby adjusting the surface temperature of the test piece 24. This allows for a high-temperature (1600℃) - low-temperature (room temperature) cycle. Combined with the movement of the horizontal slide 401 along the X-axis and the loading and unloading of the test machine 300, a combined cycle mode of high-temperature - low-temperature - cooling temperature cycle and high-load - low-load force cycle can be achieved, simulating the actual load conditions of the turbine blades under the complete flight envelope of the engine. Furthermore, a lifting base 402 for supporting the gas generator 100 is provided on the double horizontal slide 401. By controlling the height of the lifting base 402, alignment with the test piece 24 can be achieved. At the same time, the temperature of the test piece 24 can be controlled by the direction and distance of the left and right movement of the double horizontal slide 401. Thus, in the second embodiment, the gas generator 100 achieves relatively free movement in three-dimensional space through the vertically arranged double horizontal slide 401 and lifting base 402.

[0095] As a second aspect of this application, a method is provided as follows: Figures 1-14 The method of using the fatigue testing device shown includes: the test piece 24 is fixed by the upper and lower pull rod assemblies in the pull rod module, one end of the upper pull rod assembly is fixed to the upper crossbeam 302 of the testing machine 300, and one end of the lower pull rod assembly is fixed to the testing machine 300; the loading system set in the testing machine 300 drives the lower pull rod module to perform dynamic tensile load fatigue test; and the gas generator 100 is fixed on the vertically arranged double horizontal slide 401 on the frame, fuel is introduced into the gas generator 100 for combustion to generate gas, and the generated gas provides a hot corrosion gas environment for the test piece 24; the distance and / or angle between the gas generator 100 and the test piece 24 is controlled by controlling the movement of the vertically arranged double horizontal slide 401, thereby controlling the temperature of the test piece 24, and then, in conjunction with the cyclic loading of the load, the hot corrosion-mechanical fatigue test of the test piece 24 is realized.

[0096] In some embodiments, cooling water E is introduced into the cooling water through-hole 204 of the high-temperature alloy joint 22, and cold air F is introduced into the cold air inlet 202 located at the root of one side of the high-temperature alloy joint 22. The cold air F is discharged through the cold air outlet 203 located in the middle of the test piece 24. By introducing cooling water E into the cooling water through-hole 204 of the high-temperature alloy joint, the high-temperature alloy joint 22 is cooled down to prevent heat transfer to the force sensor and damage to the testing machine 300. By introducing cold air F into the cold air inlet 202, the cold air F passes through the first hollow structure 206 and the second hollow structure 207 to cool the directional alloy joint 23 and the test piece 24, and is discharged from the cold air outlet 203 located in the middle of the test piece 24. Through the hollow structure of the test piece 24, the outside of the test piece 24 is heated by the high-temperature combustion gas D, and the inside is cooled by the cold air F, forming a temperature gradient distribution of external heat and internal cold, thereby simulating the temperature gradient of the internally cooled blades in an engine.

[0097] In some embodiments, the test piece 24, fixed by the tie rod module 200, passes through the tie rod hole 504 provided in the auxiliary heating furnace 500 and enters the furnace cavity of the auxiliary heating furnace 500. Under the thermal radiation of the heating rod 507, the temperature of the gas D entering the auxiliary heating furnace 500 through the gas inlet 503 is increased. The test piece is heated together with the gas D by the thermal radiation of the heating rod, ensuring that the gas temperature reaches the advanced engine temperature (above 1600°C).

[0098] In some embodiments, the temperature of the test piece 24 is controlled by controlling the direction of movement and / or distance of the vertically arranged double horizontal slides 401, and the lifting and lowering of the lifting base 402.

[0099] In some embodiments, fuel enters the gas generator 100 and is burned by an igniter to produce gas D.

[0100] In some embodiments, the fuel combustion gas D is mixed with a salt solution and / or dust entering the gas generator 100.

[0101] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fatigue testing apparatus for thermal corrosion in a coupled environment of a gas-fired heat engine, characterized in that, include: The testing machine is equipped with a main frame containing two columns, an upper crossbeam connecting the two columns, and a loading system that provides load to the tie rod module; The tie rod module consists of two sets of tie rod assemblies with the same structure. One end of the upper tie rod assembly is fixed to the upper crossbeam, and one end of the lower tie rod assembly is fixed inside the testing machine. The other end of the lower tie rod assembly, together with the upper tie rod assembly, is used to fix and connect the test piece and perform dynamic tensile load fatigue test under the drive of the loading system. A gas generator is fixed on the frame by two vertically arranged horizontal slides. The gas generator is suitable for producing gas by fuel combustion. The produced gas provides a thermal corrosion gas environment for the test piece. The distance and / or angle between the gas generator and the test piece is controlled by the movement of the horizontal slides, thereby controlling the temperature of the test piece.

2. The fatigue testing apparatus according to claim 1, characterized in that, The gas generator includes: The combustion chamber includes a housing consisting of an outer casing of the combustion chamber and a front cover plate of the combustion chamber, and a flame tube located inside the housing; The cyclone separator is fixed to the head of the flame tube by a cyclone separator cover plate; The dual-fuel nozzle is inserted into the combustion chamber through a pre-reserved through hole on the front cover plate of the combustion chamber, and the nozzle end of the dual-fuel nozzle extends into the interior of the swirler through the central hole of the swirler. The internal space of the dual-fuel nozzle is provided with a first fuel channel and a second fuel channel that are independent of each other. The first fuel pipe and the second fuel pipe are in fluid communication with the internal space of the dual fuel nozzle; Multiple first air inlets are provided on the outer casing of the combustion chamber. After the first air enters the combustion chamber through the first air inlet, it forms an air film that surrounds the flame tube. At the same time, the first air surrounding the flame tube flows back and enters the cyclone separator through the air hole on the cyclone separator cover plate, where it mixes with the first fuel and the second fuel. The resulting atomized mixture enters the flame tube. An igniter is fixedly mounted on the combustion chamber, with one end passing through the outer casing of the combustion chamber and inserted into the interior of the flame tube to ignite the atomized mixture.

3. The fatigue testing apparatus according to claim 2, characterized in that, The gas generator also includes: The exhaust chamber is located downstream of the flame tube. The exhaust chamber includes an outer exhaust casing and an outlet section located inside the outer exhaust casing. The outlet section communicates with the flame tube and is provided with a gas outlet for the high-temperature gas formed by the combustion of the atomized mixture. The gas outlet is located on the horizontal central axis of the flame tube and the outlet section. The gas generator may optionally also include: A secondary combustion chamber is disposed between the combustion chamber and the emission chamber. The secondary combustion chamber includes an outer casing for the secondary combustion chamber and a secondary combustion section located inside the outer casing for the secondary combustion chamber. The secondary combustion section communicates with the flame tube and the outlet section. The outer casing of the secondary combustion chamber is provided with multiple second air inlets. Second air enters the secondary combustion section through the second air inlets so that the atomized mixture can be fully combusted.

4. The fatigue testing apparatus according to claim 3, characterized in that, The discharge chamber is also equipped with: Salt solution inlet and / or dust inlet; and Thermocouples are used to monitor the temperature of gas.

5. The fatigue testing apparatus according to any one of claims 1-4, characterized in that, The testing machine is also equipped with a slide table bracket and an auxiliary heating furnace; The slide bracket is fixed on the double columns of the testing machine, and a linear slide rail is provided on the slide bracket. Two lower crossbeams are installed on the linear slide rail. The auxiliary heating furnace adopts a two-part split design, which is fixed on the two lower crossbeams of the linear slide rail. The two lower crossbeams move back and forth along the linear slide rail to realize the opening and closing of the auxiliary heating furnace. The fatigue testing apparatus also includes: A monitoring bracket, fixed on any of the aforementioned horizontal sliding platforms, is used to support the monitoring equipment.

6. The fatigue testing apparatus according to claim 5, characterized in that, The auxiliary heating furnace includes: The furnace body is composed of an insulation liner, which includes an outer liner and an inner liner from the outside to the inside. The furnace cavity is equipped with at least four sets of heating rods, which are arranged at non-equidistant intervals to provide a heating environment; and Pull rod holes are provided at the top and bottom of the auxiliary heating furnace so that the test piece passes through the insulation liner of the auxiliary heating furnace and reaches the furnace cavity of the auxiliary heating furnace.

7. The fatigue testing apparatus according to claim 6, characterized in that, The double horizontal slide is provided with a lifting base for supporting the gas generator. By controlling the height of the lifting base and the moving direction of the double horizontal slide, it can adapt to different heights and positions of the auxiliary heating furnace. The auxiliary heating furnace has a gas inlet and two observation windows on one side of its furnace body, and an exhaust pipe on the other side of its furnace body. The gas inlet is aligned with the gas outlet of the test piece and the gas generator, and the angle between the gas inlet and the heating rod is 60°. The observation windows are symmetrically arranged on both sides of the gas inlet, facing the center of the auxiliary heating furnace, and the angle between the observation windows and the gas inlet is 30°.

8. The fatigue testing apparatus according to claim 7, characterized in that, The tie rod assembly consists of a main connector, a high-temperature alloy connector, and a directional alloy connector connected in sequence. The high-temperature alloy joint is provided with a cooling water through hole, on which a straight quick-connect fitting is installed as a cooling water channel, and a cold air inlet is provided at the root of the high-temperature alloy joint on the side opposite to the main joint. The directional alloy joint is fixedly connected to the test piece. The interior of the directional alloy joint has a first hollow structure, which serves as a channel for cold air to cool the directional alloy joint and the test piece. The test piece has a second hollow structure, and a cold air outlet is provided in the middle of the test piece; The cold air inlet, the first hollow structure, the second hollow structure, and the cold air outlet are located on the same central axis.

9. The fatigue testing apparatus according to claim 8, characterized in that, One end of the main connector is connected to the testing machine via a thread; the other end of the main connector is a concave interface, and one end of the high-temperature alloy connector is inserted into the concave interface and fixed with a positioning pin; an internal thread is provided at the end of the high-temperature alloy connector opposite to the one connected to the main connector, and is threadedly connected to the external thread provided at one end of the directional alloy connector; the internal thread provided at the other end of the directional alloy connector is threadedly connected to the external thread of the test piece.

10. A method of using a fatigue testing apparatus as described in any one of claims 1-9, characterized in that, include: The test piece is fixed by the upper pull rod assembly and the lower pull rod assembly in the pull rod module. One end of the upper pull rod assembly is fixed to the upper crossbeam of the testing machine, and one end of the lower pull rod assembly is fixed to the testing machine. Dynamic tensile load fatigue test was performed under the drive of the loading system set in the testing machine; as well as The gas generator is fixed on a double horizontal slide table that is vertically arranged on the frame. Fuel is introduced into the gas generator to burn and produce gas. The gas produced provides a hot corrosion gas environment for the test piece. The distance and / or angle between the gas generator and the test piece are controlled by controlling the movement of the vertically arranged double horizontal slides, thereby controlling the temperature of the test piece. Combined with the cyclic loading of the load, the thermal corrosion-mechanical fatigue test of the test piece is realized.

Images