High-Temperature Test System and Method for Particle Deposition Effect in Turbine Cooling Channels

Abstract

This invention discloses a high-temperature experimental system and method for studying the particle deposition effect in turbine cooling channels, aiming to reproduce the flow loss and heat transfer characteristics caused by particle deposition inside turbine blades under real high-temperature conditions in aero-engines. A cooling system provides clean, high Reynolds number air to simulate cooling; a particle delivery system continuously and uniformly delivers real particles into the cooling air; a heating system heats the test specimen and cooling air to the actual turbine operating temperature through primary heating and secondary temperature control; particles enter the test specimen under the entrainment of the cooling air and deposit therein. The impact of the deposits on the aero-thermal performance of the cooling structure is monitored using instruments such as flow meters, pressure sensors, and infrared thermal imagers in the measurement system. A deposition-aero-thermal mapping relationship is established by comparing the deposition distribution with that obtained from a 3D profile scanner. This is of great significance for predicting the degradation law of internal blade cooling performance caused by deposition and for developing internal dust reduction structures.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine turbine blade cooling technology, specifically relating to a high-temperature test system and method for particle deposition effect in turbine cooling channels. Background Technology

[0002] Aero-engines operating for extended periods in environments with high concentrations of particulate matter (volcanic ash, sand, and sea salt, etc.) suffer severe damage to their aero-thermal performance. Particulate matter enters the turbine blades through the secondary air system. Here, on the one hand, the low temperature and interaction of multiple cooling structures create a unique deposition mechanism, making established high-temperature deposition theories difficult to apply to predicting its harmful effects; on the other hand, the confined internal space amplifies the impact of particulate deposits on blade performance, and the deposits are difficult to remove. Accurately simulating particulate matter deposition in the cooling channels inside turbine blades and analyzing the impact of these deposits on the degradation of the aero-thermal performance of the cooling structure is an urgent and valuable engineering endeavor. It also lays the theoretical foundation and provides technical reserves for the dustproof design of advanced aero-engine turbine blade cooling structures.

[0003] In existing publicly available literature, experimental studies on particulate matter deposition in internal cooling channels under high-temperature conditions are relatively limited, and the design challenges mainly lie in the following aspects:

[0004] 1. High-temperature experiments are difficult to control quickly and accurately due to the thermal surge effect;

[0005] 2. Conventional seals are prone to failure under high temperature conditions, making it difficult to guarantee the sealing performance of test pieces and pipeline connections. Leakage of high-temperature gas can easily cause safety accidents.

[0006] 3. The complex and confined space inside the blades, along with particulate contamination and extreme high temperatures, presents significant technical challenges to data measurement, including limited measurement channels, measurement errors, and equipment damage. Furthermore, high-temperature experiments are typically more expensive.

[0007] Due to the aforementioned technical challenges, there is an urgent need to design a more reasonable experimental system to measure the impact of particulate deposits on the aerothermal performance of the internal cooling structure of turbine blades. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a high-temperature test system and method for particle deposition effect in turbine cooling channels, which addresses the shortcomings of the prior art. This system simulates the deposition effect of particulate matter in the internal cooling structure of turbine blades under high-temperature conditions close to the actual working environment of aero-engine turbines, thereby solving the technical problems existing in the high-temperature deposition experiment of aero-engine turbines.

[0009] The present invention adopts the following technical solution:

[0010] A high-temperature testing system for particle deposition effects in turbine cooling channels includes:

[0011] The high-pressure gas in the cooling system is divided into two paths and enters the particle conveying system and the heating system respectively. Then they are mixed and enter the internal cooling structure test piece of the blade to simulate the cooling gas inside the blade.

[0012] Particle conveying system, used to deliver real particles conforming to ISO standards to the air conditioning duct;

[0013] The heating system is used to heat the test piece to the real working environment inside the turbine blade of an aero-engine, and to heat the cold air and the particulate matter it carries to the real cold air temperature in the turbine, thereby restoring the deposition effect of particulate matter in the cooling structure inside the turbine blade.

[0014] The measurement system is used to obtain the metal temperature on the surface of the blade internal cooling structure test piece, the flow loss inside the blade internal cooling structure test piece, and to monitor the variation of the cold air flow rate in the internal cooling structure with particulate matter deposition.

[0015] Preferably, the cooling system includes a high-pressure gas supply device and its connecting pipeline, with the high-pressure gas supply device branching into the particle conveying system and the heating system respectively.

[0016] Preferably, the compressed gas supply device includes a compressor, a refrigerated dryer, and a filter connected in sequence, with the filter outlet connected to the pressure controller of the particle conveying system and the pressure controller of the heating system, respectively.

[0017] Preferably, the particle conveying system includes a glass container, inside which a metal funnel and a conveyor belt are installed, and the outlet of the metal funnel is connected to a cold air pipeline.

[0018] Preferably, the glass container is provided with an air inlet for the particle conveying system, and a track controller for controlling the rotational speed of the conveyor track is arranged at the bottom of the glass container.

[0019] Preferably, the heating system includes a primary heating system consisting of a muffle furnace and its internal heat exchange coils, a secondary temperature control device is installed outside the muffle furnace, and the test piece of the internal cooling structure of the blades is installed inside the muffle furnace.

[0020] Preferably, the length of the heat exchange coil is 20~40 m.

[0021] Preferably, the measurement system includes a pressure sensor, a temperature sensor, an infrared thermal imager, and a three-dimensional profile scanner. The pressure sensor and temperature sensor are installed on the internal cooling structure test piece of the blade and are connected to the computer acquisition and conversion control terminal outside the muffle furnace of the heating system through the sensor channel. The infrared thermal imager and the three-dimensional profile scanner are installed at the optical window on one side of the muffle furnace wall and are respectively connected to the computer acquisition and conversion control terminal.

[0022] Preferably, the test piece of the internal cooling structure of the blade discharges the exhaust gas into the atmosphere through a pipe via an end exhaust gas treatment device and a flow sensor. The flow sensor is connected to a computer for data acquisition and conversion control.

[0023] Another technical solution of the present invention is an experimental method for a high-temperature test system for particle deposition effect in turbine cooling channels, comprising the following steps:

[0024] S1. Turn on the particle conveying system and spread a layer of particles evenly on the top of the conveyor belt of the particle conveying system.

[0025] S2. Turn on the air conditioning system to provide cooling for the entire experimental system;

[0026] S3. Turn on the heating system to heat the internal cooling structure test piece of the blade and the cold air in the pipeline;

[0027] S4. Adjust the pressure ratio between the particle conveying system and the heating system so that the pressure of the particle conveying system is always higher than that of the heating system.

[0028] S5. Calibrate the infrared thermal imager based on the surface temperature of the test piece of the internal cooling structure of the blade obtained by the temperature sensor.

[0029] S6. After the pressure and temperature of the internal cooling structure test piece of the blade reach a stable state, control the particles to mix evenly with the cold air and enter the internal cooling structure test piece of the blade to deposit.

[0030] S7. Record the flow rate during the particulate matter deposition process and the pressure changes at various locations on the internal cooling structure test piece of the blade. Record the temperature distribution changes on the surface of the internal cooling structure test piece of the blade and the flow rate changes during the deposition process.

[0031] S8. After the particle delivery is completed, keep the cooling and heating systems running to simulate the stripping effect of the airflow on the sediment.

[0032] S9. Turn off the heating system and wait for the internal cooling structure test piece of the blade to cool down before turning off the cooling system.

[0033] S10. Disassemble the test piece of the internal cooling structure of the blade and scan to obtain the particle deposition morphology inside the test piece of the internal cooling structure of the blade.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] (1) The primary heating and secondary temperature control in the heating system are combined through feedback control. This ensures that the test piece of the internal cooling structure of the turbine blade is in the high-temperature working environment inside the real turbine blade, and also appropriately reduces the temperature of the cold air mixed with real particles, thereby simulating the real cold air working conditions of the engine.

[0036] (2) The glass container used in the particle conveying system ensures that the particle release can be directly observed in the experiment, and the speed of the conveyor belt can be adjusted in a timely manner through the controller outside the glass container to control the particle release rate.

[0037] (3) All measurements at high temperatures are non-contact or have protective structures, which ensures both the safety of the experimenters and the reliability of the measurement data.

[0038] (4) Multi-device cross-verification and mutual calibration, and real-time monitoring of changes in the aerodynamic and heat transfer performance of the internal cooling structure test piece.

[0039] (5) The test piece adopts a modular and detachable design, which not only facilitates the construction of the experimental system and the installation of equipment, but also allows for a direct view of the deposition morphology inside the test piece after deposition.

[0040] In summary, this invention heats the test specimen and the cooling gas to the actual turbine operating temperature through primary heating and secondary temperature control. Particulate matter enters the test specimen under the entrainment of the cooling gas and deposits. The influence of the deposits on the gas-thermal performance of the cooling structure is monitored by flow meters, pressure sensors, and infrared thermal imagers in the measurement system. A deposition-gas-thermal mapping relationship is established with the deposition distribution obtained by the three-dimensional profile scanner. This is of great significance for predicting the degradation law of the internal cooling performance of the blade and developing internal dust reduction structures.

[0041] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the following description of the relative embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of a high-temperature experimental system for studying the particulate deposition effect in the internal cooling channel of a turbine blade, provided by the present invention;

[0044] Figure 2 This is a cross-sectional schematic diagram of a particle conveying system.

[0045] The components include: 1. Compressor, 2. Refrigerated dryer, 3. Filter, 4. Pressure controller for particle conveying system, 5. Pressure controller for heating system, 6. Screw-bolt fit, 7. Glass container, 8. Metal funnel, 9. Conveyor belt, 10. Air inlet for particle conveying system, 11. Muffle furnace, 12. Heat exchange coil, 13. Secondary temperature control device, 14. Test piece of internal cooling structure for blades, 15. Pressure sensor, 16. Temperature sensor, 17. Exhaust gas treatment device, 18. Optical window, 19. Sensor channel, 20. Infrared thermal imager, 21. 3D contour scanner, 22. Computer acquisition and conversion control terminal, 23. Flow sensor, and 24. Belt controller. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0050] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0051] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0052] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0053] This invention provides a high-temperature experimental system and method for particle deposition effects in turbine cooling channels. It is used to simulate the high-temperature and particulate contamination working environment of aero-engine turbines and to solve the technical challenges faced in high-temperature deposition experiments. It reproduces the particle deposition phenomenon inside turbine blades. By building a high-temperature deposition experimental system, the aero-thermal performance changes of the internal cooling structure under different deposition durations are measured to obtain the general law of the influence of deposition on the cooling capacity of the blades. This provides a theoretical basis and data support for the development of advanced dustproof structures inside aero-engine turbine blades.

[0054] Please see Figure 1 The present invention provides a high-temperature test system for particle deposition effect in turbine cooling channels, comprising a cooling system, a heating system, a particle conveying system, and a measurement system;

[0055] The cooling system includes a high-pressure gas supply device and its connecting pipelines. The high-pressure gas is divided into two paths and enters the particle conveying system and the heating system respectively. Then they are mixed together and enter the internal cooling structure test piece 14 of the blade to simulate the cooling gas inside the blade. Its maximum Reynolds number reaches 80,000, which is close to the actual operating conditions of the aero-engine.

[0056] The glass container 7 and its internal conveyor belt 9 and metal funnel 8 form a particle conveying system and are connected to the refrigeration system to transport real particles that meet ISO standards to the high-temperature refrigeration in the refrigeration pipeline.

[0057] The heating system has primary heating and secondary temperature control functions. The primary heating includes the muffle furnace 11 and its internal heat exchange coil 12, which is mainly responsible for heating the test piece 14 of the internal cooling structure of the blade to the actual internal metal temperature of the blade and heating the airflow to a temperature close to that of the actual cold air. The secondary temperature control is the secondary temperature control device 13 outside the muffle furnace 11, which precisely controls the temperature of the high-temperature airflow after primary heating and mixing with the actual particles to achieve the actual cold air temperature.

[0058] Infrared thermal imager 20 and three-dimensional contour scanner 21 monitor the test piece through optical window 18 opened on the furnace wall of muffle furnace 11. Pressure sensor 15 and temperature sensor 16 output signals outside the furnace through sensor channel 19. A flow sensor 23 is also installed after the tail gas treatment device 17 at the end of the experimental system. They are all connected to computer acquisition and conversion control terminal 22 to form a measurement system.

[0059] By simulating the real high-temperature working environment of aero-engine turbine blades, the deposition effect of particulate matter in the internal cooling structure of turbine blades is reproduced, and the impact of particulate deposits on the aero-thermal performance of the blade cooling structure is studied.

[0060] The high-pressure gas supply device includes a compressor 1, a refrigerated dryer 2 and a filter 3 connected in sequence. The outlet of the filter 3 is connected to the pressure controller 4 of the particle conveying system and the pressure controller 5 of the heating system, respectively. All connecting pipelines are made of 310S high-temperature resistant stainless steel.

[0061] The main body of the particle conveying system is a glass container 7 with a cylinder head assembly. At the bottom of the glass container 7, a conveying track 9 with a rotation speed that can be controlled by a track controller 24 is arranged. The real particles conforming to ISO standards, which are laid flat on the top of the track, are evenly conveyed to a metal funnel 8 connected to a cold air pipeline. The particles are then mixed with the cold air in the pipeline.

[0062] High-pressure gas enters the glass container 7 through the inlet 10 of the particle conveying system, and then carries the particles out of the particle conveying system through the metal funnel 8 and merges into the high-temperature cold gas. The pressure of the particle conveying system should be higher than that of the heating system to ensure that the particles can smoothly enter the cold gas pipeline without backflow. The pipeline after the particle conveying system and the cold gas system are connected directly to the internal cooling structure test piece 14 of the blade, without any bends, to prevent the particles from depositing in the connecting pipeline.

[0063] The glass container 7 is sealed using a screw-hole bolt connection 6.

[0064] The primary heating system includes a muffle furnace 11 and a 310S high-temperature resistant metal heat exchange coil 12 arranged on top of it. The muffle furnace 11 can heat the test piece 14 of the internal cooling structure of the blade arranged at the bottom of the furnace to the internal metal temperature of the real blade and provide heat preservation. It can also heat the airflow in the heat exchange coil 12 with a total length of 20~40 m at the top of the furnace to make it reach a temperature close to that of real cold air.

[0065] The secondary temperature control device 13 is arranged outside the muffle furnace 11 and is combined with the pipeline after the heat exchange coil 12. The secondary temperature control device can be a water-cooled or air-cooled device to reduce the airflow temperature after primary heating to the actual cold air temperature and to precisely control its temperature.

[0066] The exhaust gas treatment device 17 filters and cools the high-temperature cold gas containing particulate matter so that it can be directly discharged into the atmosphere and ensure the normal operation of the subsequent flow sensor 23.

[0067] The metal temperature on the surface of the internal cooling structure test piece 14 of the blade is obtained using an infrared thermal imager 20. A temperature sensor 16 is bonded to the surface of the internal cooling structure test piece 14 using a high thermal conductivity and high temperature resistant inorganic adhesive to eliminate contact thermal resistance, and the infrared thermal imager 20 is calibrated accordingly. Pressure sensors 15 are arranged in pressure holes on the internal cooling structure test piece 14 to obtain the flow loss inside the internal cooling structure test piece 14. A flow sensor 23 is installed at the end of the experimental system to monitor the change of the cold air flow rate in the internal cooling structure with the deposition of particulate matter.

[0068] The test piece adopts a modular and detachable design, and each module is fastened with a bolt-and-screw connection; at the same time, all connections are sealed with copper and high thermal conductivity and high temperature resistant inorganic adhesive.

[0069] An experimental method for a high-temperature testing system for particle deposition effects in turbine cooling channels includes the following steps:

[0070] S1. Open the top cover of the glass container 7 of the particle conveying system, spread a layer of particles evenly on the top of the conveyor belt 9, and then close the top cover.

[0071] S2. Turn on the compressor to provide cooling air to the entire experimental system;

[0072] S3. Turn on the heating system to heat the test piece and the cold air in the pipeline;

[0073] S4. Adjust the pressure ratio between the particle conveying system and the heating system so that the pressure of the particle conveying system is always higher than that of the heating system.

[0074] S5. Calibrate the infrared thermal imager 20 based on the temperature sensor 16 on the surface of the internal cooling structure test piece 14 of the blade.

[0075] S6. When the readings of the pressure sensor 15 and temperature sensor 16 of the test piece reach a stable state, the conveyor belt 9 is turned on by the track controller 24, so that the particles are evenly mixed with the cold air through the metal funnel 8 and enter the test piece to deposit.

[0076] S7. Record the changes in the values ​​of the flow sensor 23 and the pressure sensors 15 of the test piece during the particulate deposition process, and record the temperature distribution changes on the surface of the internal cooling structure test piece 14 of the blade by the infrared thermal imager 20.

[0077] S8. After the particle delivery is completed, keep the cooling and heating systems running for half an hour to simulate the stripping effect of the airflow on the sediment.

[0078] S9. Turn off the heating system and wait for the test piece to cool down before turning off the cooling system.

[0079] S10. Disassemble the internal cooling structure test piece 14 of the blade and use a three-dimensional contour scanner to scan and obtain the particle deposition morphology inside the test piece.

[0080] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0081] The working process of the high-temperature test system for particle deposition effect in turbine cooling channels according to the present invention is as follows:

[0082] Compressor 1 compresses the air, which then passes through refrigerated dryer 2 and filter 3 to obtain clean, dry, high-pressure air. The air is then divided into two parts and flows to the particle conveying system and the heating system, respectively, with the pressure regulated by two pressure controllers.

[0083] In the heating system, the muffle furnace 11 can heat the test piece 14 of the internal cooling structure of the blade at the bottom of the furnace to simulate the high temperature conditions inside the real turbine blade, and also use the heat exchange coil 12 at the top of the furnace to heat the cold air. This part of the airflow then flows out of the muffle furnace 11 and enters the secondary temperature control device 13 to accurately cool down to the real cold air temperature.

[0084] In the particle conveying system, the flat real particles are transported by the conveyor belt 9 into the metal funnel 8, and then mixed with the heated cold air under the action of gravity and pressure difference and enter the internal cooling structure test piece 14 of the blade to be deposited.

[0085] During the deposition process, the gas-thermal performance changes of the internal cooling structure are monitored in real time by the pressure sensor 15, flow sensor 23, infrared thermal imager 20, and temperature sensor 16 in the measurement system. After the deposition is completed, the particulate matter deposition morphology in the cooling structure is scanned by the three-dimensional contour scanner 21.

[0086] In actual operation, the specific process is as follows:

[0087] After evenly spreading a layer of real granules on the top of the conveyor belt 9, close the top cover to seal the glass container 7.

[0088] Turn on the cooling system to provide airflow to the entire experimental system; turn on the heating system to heat the test piece and the cooling system separately and regulate the temperature.

[0089] Adjust the mass flow rate ratio of the particle conveying system and the heating system so that the pressure of the particle conveying system is higher than that of the heating system to prevent backflow in the particle conveying system;

[0090] The infrared thermal imager 20 is calibrated using the temperature sensor 16 on the surface of the blade internal cooling structure test piece 14; after the readings of the pressure sensor 15, flow sensor 23 and temperature sensor 16 of the test piece stabilize, the conveyor belt 9 is turned on by the track controller 24, so that the particles are uniformly mixed with the cold air through the metal funnel 8 and enter the test piece to deposit.

[0091] The changes in the values ​​of the flow sensor 23 and each pressure sensor 15 in the test piece are recorded during the particulate matter deposition process. At the same time, the temperature distribution changes on the surface of the internal cooling structure test piece 14 of the blade are recorded by the infrared thermal imager 20.

[0092] After the particle delivery is completed, the cooling and heating systems continue to operate for another half hour to simulate the stripping effect of airflow on the sediment.

[0093] The heating system was turned off, and the cooling system was turned off after the test piece cooled down. Finally, the internal cooling structure test piece 14 of the blade was disassembled, and the particle deposition morphology inside the test piece was obtained by scanning with a three-dimensional profile scanner.

[0094] Please see Figure 2 During the experimental preparation stage, the particles are spread evenly on the top of the conveyor belt 9 and the cover is closed. The glass container 7 is sealed by screw hole-bolt connection 6. When the particle release stage begins, the conveyor belt 9 is started by the belt controller 24. The particles are conveyed by the belt to the metal funnel 8. Under the action of gravity and pressure difference, the particles enter the metal funnel 8 and then mix with the cold air and enter the internal cooling structure test piece 14 of the blade.

[0095] In summary, this invention provides a high-temperature experimental system and method for particle deposition effects in turbine cooling channels. It simulates the impact of particle deposition on the aero-thermal properties of the internal cooling structure of a real turbine blade under high-temperature operating conditions. Through a cooling system, heating system, particle generation system, and measurement system, the deposition characteristics of particles in the internal cooling structure of the turbine blade under high-temperature operating conditions, as well as the changes in the aero-thermal performance of the cooling structure during the deposition process, are obtained. Based on the application results of the above embodiments, this invention has high application value in the field of turbine blade cooling.

[0096] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A high temperature experimental method for turbine cooling passage particle deposition effects, characterized by, The high-temperature test system for turbine cooling channel particle deposition effect comprises: A cold gas system, in which high-pressure gas is divided into two paths to enter the particle delivery system and the heating system respectively, and then mixed together to enter the internal cooling structure test piece (14) to simulate the internal cooling of the blade; A particle delivery system for delivering real particles meeting ISO standards to the cold gas pipeline; A heating system for heating the test piece to the real working environment inside the turbine blade of the aero-engine, and heating the cold gas and the particles carried therein to the real cold gas temperature in the turbine, and restoring the deposition effect of the particles in the internal cooling structure of the turbine blade; A measurement system for obtaining the metal temperature of the surface of the internal cooling structure test piece (14) and the flow loss inside the internal cooling structure test piece (14), and monitoring the change rule of the cold gas flow in the internal cooling structure with the deposition of particles; The experimental method comprises the following steps: S1, open the particle delivery system, and uniformly pave a layer of particles on the top of the delivery belt of the particle delivery system; S2, start the cold gas system to provide cold gas for the entire experimental system; S3, start the heating system to heat the internal cooling structure test piece of the blade and the cold gas in the pipeline; S4, adjust the pressure ratio of the particle delivery system and the heating system so that the pressure of the particle delivery system is always higher than that of the heating system; S5, calibrate the infrared thermal imager according to the surface temperature of the internal cooling structure test piece of the blade obtained by the temperature sensor; S6, when the pressure and temperature of the internal cooling structure test piece of the blade reach stability, control the particles to uniformly mix with the cold gas and enter the internal cooling structure test piece of the blade to deposit; S7, record the flow and the change of the pressure of the internal cooling structure test piece of the blade at each position during the deposition of the particles, record the temperature distribution change of the surface of the internal cooling structure test piece of the blade, and record the flow change during the deposition; S8, after the particle delivery is completed, keep the cold gas system and the heating system working to simulate the stripping effect of the airflow on the deposits; S9, turn off the heating system, and after the internal cooling structure test piece of the blade cools down, turn off the cold gas system; S10, disassemble the internal cooling structure test piece of the blade, and scan to obtain the deposition morphology of the particles inside the internal cooling structure test piece of the blade.

2. The high temperature test method for turbine cooling passage particle deposition effects of claim 1, wherein, The cold gas system comprises a high-pressure gas supply device and its connecting pipeline, and the high-pressure gas supply device is divided into two paths to enter the particle delivery system and the heating system respectively.

3. The high temperature test method for turbine cooling passage particle deposition effects of claim 2, wherein, The high-pressure gas supply device comprises a compressor (1), a cold dryer (2) and a filter (3) connected in sequence, and the outlet of the filter (3) is connected with a particle delivery system pressure controller (4) and a heating system pressure controller (5) respectively.

4. The high temperature test method for turbine cooling passage particle deposition effects of claim 1, wherein, The particle delivery system comprises a glass container (7), and the inside of the glass container (7) is provided with a metal hopper (8) and a delivery belt (9), and the outlet of the metal hopper (8) is connected with the cold gas pipeline.

5. The high temperature test method for turbine cooling passage particle deposition effects of claim 4, wherein, A particle delivery system air inlet (10) is arranged on the glass container (7), and a belt controller (24) for controlling the rotating speed of the delivery belt (9) is arranged at the bottom of the glass container (7).

6. The high temperature test method for turbine cooling passage particle deposition effects of claim 1, wherein, The heating system comprises a primary heating system composed of a muffle furnace (11) and a heat exchange coil (12) inside the muffle furnace (11), and a secondary temperature control device (13) arranged outside the muffle furnace (11), and the blade internal cooling structure test piece (14) is arranged in the muffle furnace (11).

7. The high temperature test method for turbine cooling passage particle deposition effects of claim 6, wherein, The length of the heat exchange coil (12) is 20-40 m.

8. The high temperature test method for turbine cooling passage particle deposition effects of claim 1, wherein, The measuring system comprises a pressure sensor (15), a temperature sensor (16), an infrared thermal imager (20) and a three-dimensional contour scanner (21), the pressure sensor (15) and the temperature sensor (16) are arranged on the blade internal cooling structure test piece (14) and connected with a computer acquisition conversion control end (22) outside the heating system muffle furnace (11) through a sensor channel (19); the infrared thermal imager (20) and the three-dimensional contour scanner (21) are arranged at an optical window (18) on one side of the muffle furnace (11) and connected with the computer acquisition conversion control end (22) respectively.

9. The high temperature test method for turbine cooling passage particle deposition effects of claim 8, wherein, The blade internal cooling structure test piece (14) is connected with an end gas treatment device (17) and a flow sensor (23) through a pipeline to discharge tail gas into the atmosphere, and the flow sensor (23) is connected with the computer acquisition conversion control end (22).

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