Dynamic stress test measuring device and measuring method

Abstract

The invention relates to the technical field of dynamic stress measurement, in particular to a dynamic stress test measuring device and method. A dynamic stress test measuring device comprises a plurality of high-temperature resistance strain gauges which are arranged at preset positions of a plurality of blades to be measured; the slip ring electricity leading device is connected with the high-temperature resistance strain gauge through a high-temperature wire and is suitable for transmitting data measured by the high-temperature resistance strain gauge to the stress tester; and the cooling assembly is suitable for introducing cooling air into the interior and the exterior of the slip ring electricity introducing device respectively. The device solves the problems that an existing dynamic stress test measuring device is prone to being damaged in a high-temperature, high-pressure and high-flow-speed gas environment, and the measuring accuracy is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dynamic stress measurement, in particular to a dynamic stress test measurement device and a measurement method. BACKGROUND

[0002] With the development of aero-engines, the pressure ratio of the compressor, the turbine inlet temperature and the airflow velocity inside the engine are continuously improved, and the working environment of the blade is becoming more and more severe. During the development and use of the engine, the compressor working blade often breaks due to fatigue, and the power turbine working blade breaks due to complex stress, etc. Blade damage or breakage will cause engine performance degradation, large vibration, damage to the casing and other accessories, and even cause the entire engine to be scrapped, resulting in serious consequences.

[0003] Due to the complex mechanical load and aerodynamic load on the blade during operation, the dynamic stress level of the blade in the working state cannot be obtained through calculation and analysis alone. Therefore, in the development process of the engine, the reliability of the blade must be mastered by measuring the dynamic stress of the engine blade. Moreover, only by measuring the vibration stress of the compressor and turbine blades of the engine can the vibration stress level of the engine in various working states be determined.

[0004] However, the dynamic stress measurement of the engine blade requires instruments and instruments with complex structure, long-term temperature resistance and vibration resistance. During the test, the strain gauge and the electric lead are often damaged at high temperature, high pressure and high flow rate, causing the test to be interrupted, so that the characteristic correlation between the stress generated by the engine blade within the flight envelope and the engine working state cannot be accurately obtained, and it is further impossible to determine whether the blade can reliably work within the entire flight envelope and whether it meets the design requirements. SUMMARY

[0005] Therefore, the present application provides a dynamic stress test measurement device and a measurement method to solve the problem that the existing dynamic stress test measurement device is easily damaged in a high-temperature, high-pressure and high-flow-rate gas environment, affecting the accuracy of the measurement.

[0006] In a first aspect, the present application provides a dynamic stress test device, comprising:

[0007] A plurality of high-temperature resistance strain gauges are arranged at predetermined positions of a plurality of blades to be measured.

[0008] A slip ring electric lead is connected to the high-temperature resistance strain gauge through a high-temperature lead wire, and is adapted to transmit the data measured by the high-temperature resistance strain gauge to a stress tester.

[0009] A cooling assembly is adapted to introduce cooling gas into the interior and exterior of the slip ring electric lead, respectively.

[0010] The dynamic stress testing device provided by the application installs high-temperature resistance strain gauges at the predetermined positions of the blades to be measured of the engine, so that the high-temperature resistance strain gauges can measure the dynamic stress of the blades in real time when the engine is running, and transmit the measurement data to the stress tester through the high-temperature lead wires. During the measurement process, the cooling assembly simultaneously introduces cooling gas into the inside and outside of the slip ring current lead. Thus, due to the arrangement of the high-temperature resistance strain gauges and the high-temperature lead wires, the damage caused by high temperature to the high-temperature resistance strain gauges and the high-temperature lead wires is effectively avoided, the damage caused by high temperature to the slip ring current lead is avoided by introducing the cooling gas, and the smooth progress of the test process is ensured.

[0011] In an alternative embodiment, the cooling assembly comprises a gas supply structure and first and second cooling structures connected to the gas supply structure, the first cooling structure is arranged around the outside of the slip ring current lead, and the outlet of the second cooling structure extends into the inside of the slip ring current lead.

[0012] The first and second cooling structures simultaneously cool the outside and inside of the slip ring current lead, and the cooling efficiency and effect are better.

[0013] In an alternative embodiment, the first cooling structure comprises first and second cooling pipelines arranged in parallel, the first and second cooling pipelines are arranged in a bent manner on the part of the outside of the slip ring current lead, the bent part of the first cooling pipeline is arranged outside the bent part of the second cooling pipeline, and the outlets of the first and second cooling pipelines are arranged to face away from the blades.

[0014] The first and second cooling pipelines are arranged in a nested manner, so that the heat generated by the slip ring current lead is first exchanged with the inner tube part of the first cooling pipeline, and then exchanged with the inner tube part of the second cooling pipeline. At this time, the cooling gas in the pipeline has a lower temperature, and the heat exchange effect is better. In addition, this structure is more compact.

[0015] In an alternative embodiment, an exhaust protection cover is further arranged between the first cooling structure and the tail nozzle.

[0016] The exhaust protection cover is used to prevent the first cooling structure from being directly contacted with the engine exhaust, to isolate the engine gas from burning and heat radiation, and to improve the cooling effect.

[0017] In an alternative embodiment, a fixing structure for mounting the high-temperature lead wires is further arranged, and the fixing structure is arranged between the blade and the rotating shaft.

[0018] The arrangement of the fixing structure ensures the reliable fixation of the high-temperature lead wires.

[0019] In an alternative embodiment, the engine signal is connected to a pressure measuring device, a temperature measuring device, a vibration measuring device, a rotational speed measuring device, a flow measuring device, a noise measuring device and a monitoring device.

[0020] The arrangement of the above-mentioned devices realizes full monitoring of the engine working process, and provides a reference for test evaluation.

[0021] In a second aspect, the application further provides a method for dynamic stress measurement using a dynamic stress test measurement device, comprising the following steps:

[0022] Starting the engine which has passed the debugging check to a warm-up state and running for a first time;

[0023] Running the engine in the warm-up state to a transition state at a first predetermined speed, and after the engine speed stabilizes, continuing to run for a second time;

[0024] Running the engine in the transition state to a maximum state at a second predetermined speed, and after the engine speed stabilizes, continuing to run for a third time;

[0025] Running the engine in the maximum state to the transition state again at a third predetermined speed, and after the engine speed stabilizes, continuing to run for a second time;

[0026] Running the engine in the transition state to a cold state at a fourth predetermined speed, and running for a first time;

[0027] Measuring the dynamic stress of the engine blade in real time during the above process.

[0028] The stress measurement method provided by the application includes all working points in the engine working envelope, can fully measure the dynamic stress parameters of the blade at all working speeds of the engine, and meets the test requirements.

[0029] In an alternative embodiment, the method of pushing and pulling the engine power lever at a predetermined speed is used to realize the switching of the engine between the transition state and the maximum state.

[0030] The method of pushing and pulling the engine power lever at a predetermined speed can fully and accurately measure the dynamic stress measurement parameters of the blade at all speeds in the entire working envelope of the engine, and can avoid the failure of high-temperature strain gauges and high-temperature wires caused by the sudden changes of airflow velocity, pressure and temperature in the flow passage due to too fast changes of the engine state, thereby avoiding test interruption.

[0031] In an alternative embodiment, starting the engine to a warm-up state includes first starting to a ground idle state and then running to an air idle state; and running the engine to a cold state includes first running to an air idle state and then running to a ground idle state.

[0032] In an alternative embodiment, the commissioning checks of the engine include static commissioning, cold run commissioning, false start commissioning, and engine start to ground idle speed check.

[0033] The commissioning checks before the test ensure the smooth progress of the later test, and avoid the influence on the measurement results caused by other reasons. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0035] Figure 1 It is a schematic diagram of the dynamic stress test measuring device of the embodiment of the present application.

[0036] Figure 2 It is a dynamic stress test map of the engine.

[0037] Explanation of reference signs:

[0038] 1. High-temperature resistance strain gauge; 2. Blade; 3. Slip ring power supply; 4. High-temperature wire; 5. Stress tester; 6. Connection and mounting section; 7. Engine exhaust manifold; 8. Air supply structure; 9. First cooling structure; 10. Second cooling structure; 11. Wire protection tube; 12. Sealing ring; 13. Tail nozzle; 14. Exhaust protection cover; 15. Fixing structure; 16. Pressure measuring device; 17. Temperature measuring device; 18. Vibration measuring device; 19. Rotational speed measuring device; 20. Flow measuring device; 21. Noise measuring device; 22. Monitoring device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0040] The embodiments of the present application will be described below in combination with Figure 1 and Figure 2 .

[0041] The measuring device and the measuring method provided by the embodiment of the application have a wide application range, and can be applied to dynamic stress measurement of a compressor and a turbine part, and can also be applied to dynamic stress measurement of a compressor and a turbine blade of a whole engine. The embodiment takes the measurement of a turbine blade of a whole engine as an example for description.

[0042] According to the embodiment of the application, a dynamic stress test measuring device is provided, as shown in the figure, comprising: Figure 1

[0043] A plurality of high-temperature resistance strain gauges 1 are arranged at predetermined positions of a plurality of blades 2 to be measured.

[0044] A slip ring current lead 3 is connected with the high-temperature resistance strain gauges 1 through high-temperature lead wires 4, and is suitable for transmitting data measured by the high-temperature resistance strain gauges 1 to a stress tester 5.

[0045] A cooling assembly is suitable for introducing cooling gas into the inside and outside of the slip ring current lead 3, respectively.

[0046] The above-mentioned embodiment is described in combination with the accompanying drawings. Figure 1 It can be known that the high-temperature resistance strain gauges 1 can be arranged at the tip of the blade 2 to be measured, or can be arranged at the root, and the arrangement can be realized by a pasting method. The high-temperature resistance strain gauges 1 are used for measuring the strain and deformation of the blade 2, and the high-temperature lead wires 4 are used for conducting the strain signal. Both of them are installed in the engine assembly process, and belong to one-time installation, and the installation process needs to be cautious. The slip ring current lead 3 can transmit signals and data between a high-speed rotating part and a fixed part, and is used for conducting the stress signal of the blade 2 to the stress tester 5. Through the connection of the installation section 6, the slip ring current lead 3 is axially installed in the engine exhaust manifold 7, and is installed after the engine is completely assembled.

[0047] The dynamic stress test device provided by the application installs the high-temperature resistance strain gauges 1 at the predetermined positions of the blades 2 to be measured of the engine. When the engine is running, the high-temperature resistance strain gauges 1 can measure the dynamic stress of the blade 2 in real time, and transmit the measurement data to the stress tester 5 through the high-temperature lead wires 4. In the measurement process, the cooling assembly introduces the cooling gas into the inside and outside of the slip ring current lead 3. Due to the arrangement of the high-temperature resistance strain gauges 1 and the high-temperature lead wires 4, the damage caused by high temperature to them is effectively avoided. The introduction of the cooling gas avoids the damage of high temperature to the slip ring current lead 3, and ensures the smooth progress of the test process.

[0048] In one embodiment, the cooling assembly comprises a gas supply structure 8, a first cooling structure 9 connected with the gas supply structure 8, and a second cooling structure 10. The first cooling structure 9 is arranged around the outside of the slip ring current lead 3, and the outlet of the second cooling structure 10 extends to the inside of the slip ring current lead 3.

[0049] ​The air supply structure 8 is a cooling gas storage tank, and two outlet pipelines are connected in parallel, and the outlets of the two pipelines are communicated with the inlets of the first cooling structure 9 and the second cooling structure 10 respectively. Specifically, the first cooling structure 9 is a cooling bin, and the second cooling structure 10 is a cooling vehicle. The cooling bin can not only cool the outside of the slip ring current collector 3, but also cool the test line used to connect the slip ring current collector 3 and the stress tester 5. The test line is provided with a wire protection tube 11, which can prevent the test line from being affected by the airflow behind the engine, and ensure that the signal transmission is normal and the outside is intact during the test. The cooling vehicle cools the slip ring current collector 3 by supplying cooling gas to the inside of the slip ring current collector 3. In order to ensure the internal cooling and oil mist supply of the slip ring current collector 3, the cooling vehicle is installed within a range of 2 meters from the slip ring current collector 2, and can be installed near the engine, connected with the engine through the test cable and the cooling oil pipe, and connected with the air supply structure 8 at the other end. The cooling gas supply pressure is set according to the requirements of the slip ring current collector 3, and is usually 0.1-0.22MPa. In order to ensure the internal working environment of the slip ring current collector 3, the air supply structure 8 needs to be equipped with a required air filter.

[0050] The first cooling structure 9 and the second cooling structure 10 simultaneously cool the outside and the inside of the slip ring current collector 3, and the cooling efficiency and effect are better.

[0051] In one embodiment, the first cooling structure 9 includes first and second cooling pipelines arranged in parallel, the first and second cooling pipelines are arranged in a bent manner on the part of the slip ring current collector 3 outside, and the bent part of the first cooling pipeline is arranged outside the bent part of the second cooling pipeline, and the outlets of the first and second cooling pipelines are arranged in a direction away from the blade 2.

[0052] The first cooling pipeline is arranged inside the wire protection tube 11, and the second cooling pipeline is arranged outside the wire protection tube 11, and the first and second cooling pipelines are arranged in a "C" shaped bent manner on the part of the slip ring current collector 3 outside. The difference is that the "C" shaped opening of the first cooling pipeline is larger, and the "C" shaped opening of the second cooling pipeline is smaller, and the two arms are arranged in a substantially coincident manner. In order to prevent the cooling gas from entering the space in front of the engine exhaust manifold 7, a sealing ring 12 is arranged between the blade 2 and the slip ring current collector 3, the sealing ring 12 is a high-temperature-resistant sealing ring, and is arranged on the rotating shaft of the engine.

[0053] The first and second cooling pipelines are arranged in an inner and outer sleeve manner, so that the heat generated by the slip ring current collector 3 is first exchanged with the inner tube part of the first cooling pipeline close to it, and then exchanged with the inner tube part of the second cooling pipeline close to it. At this time, the cooling gas in the pipeline has a lower temperature, and the heat exchange effect is better. At the same time, this structure is more compact. The cooled cooling gas is discharged outward through the first and second cooling pipelines on the outside.

[0054] In one embodiment, an exhaust shield 14 is further arranged between the first cooling structure 9 and the tail nozzle 13.

[0055] The exhaust shield 14 completely covers the outlets of the first cooling pipeline and the second cooling pipeline, and the outlets are arranged in a tapered manner. The exhaust shield 14 is used to prevent the first cooling structure 9 from being directly contacted with the engine exhaust, to insulate the engine gas burn and heat radiation, and to improve the cooling effect.

[0056] In one embodiment, a fixing structure 15 for mounting the high-temperature wire 4 is further included, and the fixing structure 15 is arranged between the blade 2 and the rotating shaft.

[0057] The fixing structure 15 is a component that is modified and designed for the mounting of the high-temperature wire 4, and is modified and processed by punching, grooving, changing the connecting structure, etc. The fixing structure 15 is installed in the same way as the original engine parts, and is installed in the engine assembly process. The setting of the fixing structure 15 ensures the reliable fixation of the high-temperature wire 4.

[0058] In one embodiment, the pressure measuring device 16, the temperature measuring device 17, the vibration measuring device 18, the rotating speed measuring device 19, the flow measuring device 20, the noise measuring device 21 and the monitoring device 22 connected with the engine signals are further included.

[0059] In order to ensure the equipment monitoring in the test process, the vehicle platform data acquisition system provides a temperature test channel for the temperature monitoring of the bearing of the slip ring current collector, the cooling vehicle, the inside of the cooling cover, etc., and provides a pressure test channel for the cavity pressure monitoring of the slip ring current collector. The corresponding test channels can be realized by reserving the temperature module and the pressure module in the data acquisition system.

[0060] The cooling vehicle, the air supply structure, the wire protection tube, the stress tester, the noise measuring device, the test wire, etc. are all installed on site. In order to ensure the normal work in the test process and meet the test requirements, multiple debugging is performed before the test. In the test, in order to cooperate with the data acquisition of the stress tester, the vehicle platform needs to provide a rotating speed signal for the data acquisition of the stress tester. The rotating speed test signal provided by the vehicle platform is the real-time collected rotating speed signal of the turbine, and the range is usually (0-20000) r / min. After the air supply structure is debugged before the test, it is maintained until the end of the test, and no operation is required during the period.

[0061] The setting of the above-mentioned devices realizes the whole-process monitoring of the engine working process, and provides a reference basis for the test evaluation.

[0062] According to the embodiment of the present application, on the other hand, as shown in Figure 2 the present application also provides a method for measuring dynamic stress by using the dynamic stress test measuring device, which comprises the following steps:

[0063] The engine which has completed the debugging check is started to a warm state and runs for a first time;

[0064] The engine in the warm state is run to a transition state at a first predetermined rate, and after the engine speed is stabilized, it is continued to run for a second time;

[0065] The engine in the transition state is run to a maximum state at a second predetermined rate, and after the engine speed is stabilized, it is continued to run for a third time;

[0066] The engine in the maximum state is run again to the transition state at a third predetermined rate, and after the engine speed is stabilized, it is continued to run for a second time;

[0067] The engine in the transition state is run to a cold state at a fourth predetermined rate, and runs for a first time;

[0068] The dynamic stress of the engine blade is measured in real time in the above process.

[0069] Before the formal test begins, the engine and the equipment need to be checked according to the relevant documents, and the specific content mainly includes: checking the test commonly used equipment one by one, confirming that it is intact; checking the test instrument, confirming that it is intact; checking the engine installation interface, confirming that the engine is correctly installed on the test bed; checking whether the engine rotors at all levels rotate flexibly; checking the state of the oil filter and the magnetic plug; performing the engine visual inspection according to the procedure; checking the ignition function of the ignition system.

[0070] The engine dynamic stress measurement test procedure generally includes: warm-up, transition state, dynamic stress measurement state, recovery stage, cold state. The transition state is a state specified for the engine model, in which the engine can run for a certain time, and in which the engine speed, oil pressure and other parameters are adjusted to meet the specific requirements of the dynamic stress measurement test. The state can be set as the starting point of the dynamic stress measurement, and cannot be higher than the starting point of the dynamic stress measurement. If the engine has no specific requirements for each test parameter, the state can be omitted. The test process ensures that the dynamic stress measurement equipment is intact, the measurement parameters are accurate, and the test is successful. The engine state in the test process cannot be operated repeatedly.

[0071] The stress measurement method provided by the application includes all working points in the engine working envelope, can fully measure the dynamic stress parameters of the blades at all working speeds of the engine, and meets the test requirements.

[0072] In one embodiment, the method of pushing and pulling the engine power lever at a predetermined rate is used to realize the switching of the engine between the transition state and the maximum state.

[0073] The method of slowly pushing and pulling the engine power lever at a predetermined rate can fully and accurately measure the blade dynamic stress measurement parameters at all speeds in the entire working range of the engine, and can avoid the failure of high-temperature strain gauges and high-temperature wires caused by sudden changes in airflow velocity, pressure and temperature in the flow passage due to too fast changes in the state of the engine, thereby avoiding test interruption.

[0074] In one embodiment, the engine starting to the warm-up state includes first starting to the ground idle state, and then running to the air idle state; and the engine running to the cold state includes first running to the air idle state, and then running to the ground idle state.

[0075] As shown in Figure 2 , a schematic diagram of the change of the turbine speed N g and the engine output shaft speed N s with time. The engine starts to the ground idle state and runs for t1min, and then runs to the air idle state and runs for t2min, that is, the first time is the sum of t1 and t2; the power lever is slowly pushed at a first predetermined rate to run the engine in the warm-up state to the transition state, and after the engine speed stabilizes, the engine continues to run for a second time, that is, t3min; the power lever is slowly pushed at a second predetermined rate to run the engine in the transition state to the maximum state, and after the engine speed stabilizes, the engine continues to run for a third time, that is, t4min; the power lever is slowly pulled at a third predetermined rate to run the engine in the maximum state to the transition state again, and after the engine speed stabilizes, the engine continues to run for a second time, that is, t3min; the engine in the transition state is first run to the air idle state at a fourth predetermined rate and runs for t2min; the power lever is slowly pulled at a fifth predetermined rate to the ground idle state, and after the engine speed stabilizes, the engine continues to run for t1min and stops. During the test, the engine speed, vibration, bearing temperature and other parameters are closely monitored, and the steady-state stay point is avoided to develop the engine bleed valve action speed. When all the specified test contents are completed, the dynamic stress parameters of this engine test are obtained, the dynamic stress measurement equipment is intact during the test process, and the engine is intact after the test, which indicates that the engine has completed the corresponding dynamic stress measurement test.

[0076] In one embodiment, the debugging and checking of the engine includes static debugging, cold running debugging, false start debugging and engine starting to the ground idle speed checking.

[0077] Static debugging includes joint debugging of operating system and control system, and completing joint debugging of stress test equipment and common test equipment. Cold running debugging includes debugging the engine before test by cold running (no ignition, no oil supply), checking whether the engine rotor runs flexibly, whether the oil pressure is normally established, whether the starting engine belt running speed is normal, whether the oil system leaks, and whether the engine makes abnormal sound such as friction, tinkle and the like during the cold running and the period of listening to the engine after stopping. Specifically, whether the engine rotor runs flexibly and whether the belt running speed is normal can be judged by listening to the cold running process, observing whether the engine speed change curve is smooth, whether the linear change slope is normal, and whether the highest belt running speed is within the specified range; whether the oil pressure is established can be judged by checking whether the highest oil pressure reaches the cold running target value; and whether the engine oil pipeline leaks can be visually checked. False driving debugging includes debugging the engine before test by false driving (no ignition, oil supply), checking whether the engine fuel supply is normal and whether the fuel system leaks on the basis of the cold running. Specifically, whether the fuel supply pressure and fuel supply flow meet the requirements can be checked, and whether the engine oil pipeline leaks can be visually checked. Engine starting to ground slow speed checking includes starting the engine to the ground slow speed, running t0min, and stopping. It is mainly used for checking and confirming that the engine ignition, starting and slow running are normal, confirming that each device works normally, the communication between each system is normal, each test parameter measurement, acquisition and display are normal.

[0078] The debugging and checking before test ensure the smooth progress of the later test, and avoid the influence on the measurement results caused by other reasons.

[0079] The application firstly proposes a whole engine dynamic stress test method of turboshaft turboprop engine meeting the requirements of air engine airworthiness regulations, has wide application range, can be used for dynamic stress measurement of compressor and turbine parts, and can also be used for dynamic stress measurement of whole engine compressor and turbine blades; the test method is clear, the operation process is specific, clear, standard and operable; the test method is reasonably designed, the equipment is fully protected, the engine dynamic stress in different states can be monitored and measured accurately, and the test success rate is high.

[0080] Although the embodiments of the application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dynamic stress test measuring device, characterized by, It comprises: a plurality of high-temperature resistance strain gauges (1) arranged at predetermined positions of a plurality of blades (2) to be measured; a slip ring current lead (3) connected with the high-temperature resistance strain gauges (1) through high-temperature wires (4) and adapted to transmit data measured by the high-temperature resistance strain gauges (1) to a stress tester (5); a cooling assembly adapted to introduce cooling gas into the interior and exterior of the slip ring current lead (3) respectively.

2. The dynamic stress test measurement apparatus according to claim 1, wherein The cooling assembly comprises a gas supply structure (8) and first and second cooling structures (9, 10) connected with the gas supply structure (8), the first cooling structure (9) being annularly arranged outside the slip ring current lead (3), and the outlet of the second cooling structure (10) extending into the interior of the slip ring current lead (3).

3. The dynamic stress testing measuring apparatus according to claim 2, wherein The first cooling structure (9) comprises first and second cooling pipelines arranged in parallel, the first and second cooling pipelines being arranged in a bent manner at the portions outside the slip ring current lead (3), the bent portion of the first cooling pipeline being arranged outside the bent portion of the second cooling pipeline, and the outlets of the first and second cooling pipelines being arranged in a direction away from the blades (2).

4. The dynamic stress testing measuring apparatus according to claim 3, wherein An exhaust protection cover (14) is further arranged between the first cooling structure (9) and an exhaust nozzle (13).

5. The dynamic stress testing measuring device according to any of claims 1 to 4, characterized in that A fixing structure (15) for mounting the high-temperature wires (4) is further arranged between the blades (2) and a rotating shaft.

6. The dynamic stress testing measuring device according to any of claims 1 to 4, characterized in that A pressure measuring device (16), a temperature measuring device (17), a vibration measuring device (18), a rotating speed measuring device (19), a flow measuring device (20), a noise measuring device (21) and a monitoring device (22) connected with the engine are further included.

7. A method of dynamic stress measurement using the dynamic stress tester measuring device according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: starting the engine to a warm-up state and running the engine for a first time after the completion of debugging and inspection; running the engine in the warm-up state to a transition state at a first predetermined speed, and continuing to run the engine for a second time after the engine rotating speed is stabilized; running the engine in the transition state to a maximum state at a second predetermined speed, and continuing to run the engine for a third time after the engine rotating speed is stabilized; running the engine in the maximum state to the transition state again at a third predetermined speed, and continuing to run the engine for the second time after the engine rotating speed is stabilized; running the engine in the transition state to a cold state at a fourth predetermined speed, and running the engine for the first time; measuring the dynamic stress of the engine blades in real time during the above process.

8. The method of dynamic stress measurement according to claim 7, characterized in that, The method of pushing and pulling the engine power lever at predetermined speeds is adopted to realize the switching of the engine between the transition state and the maximum state.

9. The method of dynamic stress measurement of claim 7, wherein, Starting the engine to a warm-up state comprises starting to a ground idle state and then running to an air idle state; running the engine to a cold state comprises running to an air idle state and then running to a ground idle state.

10. The method of dynamic stress measurement according to any of claims 7-9, characterized in that, The debugging and inspection of the engine comprises static debugging, cold running debugging, false start debugging and engine starting to a ground idle rotating speed inspection.

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