Air medium-based engine casing high-temperature high-pressure strength test system and method

Abstract

The application belongs to the technical field of aero-engine environment simulation, and particularly relates to an engine casing high-temperature and high-pressure strength test system and method based on air medium. The system comprises: a normal-temperature and high-pressure air subsystem mainly used for providing normal-temperature and high-pressure air used for the test; a high-temperature and high-pressure air subsystem mainly used for providing high-temperature and high-pressure air used for the test; a cold and hot air mixing subsystem mainly used for realizing rapid loading and unloading rates of temperature load and then improving test efficiency; and a temperature and pressure load measurement and control subsystem mainly used for realizing accurate measurement and coordinated control of the temperature load and the pressure load of the engine casing. The engine casing high-temperature and high-pressure strength test system based on air medium can realize real simulation of high-temperature and high-pressure load environment of the engine casing structure under test conditions, and can meet the strength test verification requirements of the engine casing under actual working load orders.

Description

Technical Field

[0001] This application belongs to the field of aero-engine environmental simulation technology, and specifically relates to a high-temperature and high-pressure strength test system and method for engine casing based on air medium. Background Technology

[0002] The engine casing is one of the main components of an aero-engine, serving to support the rotor and fix the stator. Together with other components, the casing forms the airflow channel for the engine, and the engine's thrust is also transmitted to the aircraft through the casing. Therefore, the casing is a crucial load-bearing and force-transmitting component of the engine. Simultaneously, as hot-end components of the aero-engine, the turbine casing and combustion chamber casing operate in a high-temperature gas environment, and thermal strain and creep caused by temperature loads are also factors that need to be considered in the casing's fatigue life. Due to the complex loads on the casing, in actual use, aero-engines frequently experience stator casing cracks and deformations caused by low-cycle fatigue, high-cycle fatigue, thermal stress, and creep, posing serious hidden dangers to the normal operation of the engine. Domestically, there is a lack of relevant testing and verification for casing components, especially testing technology and capabilities under high-temperature and high-pressure environments. Furthermore, from the engine casing structural design, pre-flight testing, and design finalization stages, various aero-engine standards, specifications, and airworthiness regulations have stipulated relevant regulations on the temperature and pressure operating environment of the aero-engine casing structure, clearly defining the importance of high-temperature and high-pressure strength testing and verification of the casing for engine design and development. Meanwhile, due to the rapid development of my country's current aero-engine model development, there is a significant demand for strength testing and verification of casing components. Therefore, both airworthiness regulations and standards, as well as model development requirements, necessitate the development of high-temperature and high-pressure strength testing systems and methods for casing components to meet current needs for high-temperature and high-pressure strength testing and verification, thereby contributing to the development of my country's military and civilian aero-engines.

[0003] In existing technologies, the following methods are generally used to achieve high-temperature and high-pressure strength testing of casing components: 1) Applying temperature load to the inner surface of the casing using a resistance wire heating band, and simulating the pressure load of the casing using a water bladder. However, the temperature load loading capacity is limited due to the heating capacity of the resistance wire heating band itself, and the temperature loading uniformity is poor; 2) Applying temperature load to the inner surface of the casing using radiant heating with a quartz lamp, and simulating the pressure load of the casing using high-pressure air; however, the pressure load loading capacity is limited because the quartz lamp is exposed to high-pressure air; 3) Using a graphite heater to simulate the temperature load of the casing, and using high-pressure nitrogen to apply the pressure load of the casing. This method has problems such as easy oxidation of the graphite heater electrodes and difficulty in designing the graphite heater. In addition, the common problems of the above test methods are: they cannot realistically simulate the actual air working environment of the casing, and they cannot meet the strength test verification requirements of the casing under actual working load levels.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a high-temperature and high-pressure strength testing system and method for engine casing based on air medium, so as to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of this application provides an air-medium-based high-temperature and high-pressure strength testing system for engine casings, comprising:

[0008] A normal temperature high pressure air subsystem includes a first pipeline and a first air compressor, a first oil-gas separator, a first dryer, and a first air storage tank arranged sequentially from the first end to the second end of the first pipeline;

[0009] The high-temperature and high-pressure air subsystem includes a second pipeline and a second air compressor, a second oil-gas separator, a second dryer, a second air tank, and an air heater, which are sequentially arranged from the first end to the second end of the second pipeline.

[0010] A hot and cold air mixing subsystem includes a third pipeline, a fourth pipeline, and a temperature mixer, an engine casing test module, and an exhaust tower arranged sequentially from the first end to the second end of the third pipeline. The temperature mixer is connected to the second end of the first pipeline, the second end of the second pipeline, and the first end of the fourth pipeline, and the second end of the fourth pipeline is connected to the exhaust tower.

[0011] The temperature and pressure load measurement and control subsystem includes a PLC controller and multiple measurement and control units installed on the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline.

[0012] In at least one embodiment of this application, the measurement and control unit includes: a first ambient temperature manual valve, a first flow meter, a third pressure sensor, and a first high temperature regulating valve disposed on the first pipeline, wherein,

[0013] The first ambient temperature manual valve is located between the first dryer and the first gas storage tank;

[0014] The first flow meter, the third pressure sensor, and the first high-temperature regulating valve are located sequentially between the first gas storage tank and the temperature mixer.

[0015] In at least one embodiment of this application, a check valve is further provided on the first pipeline, the check valve being located between the third pressure sensor and the first high-temperature regulating valve.

[0016] In at least one embodiment of this application, the measurement and control unit includes: a second ambient temperature manual valve, a third ambient temperature manual valve, an ambient temperature ball valve, a second flow meter, a first pressure sensor, and a first temperature sensor, all disposed on the second pipeline.

[0017] The second ambient temperature manual valve is located between the second dryer and the second gas storage tank;

[0018] The third ambient temperature manual valve, the ambient temperature ball valve, the second flow meter, and the first pressure sensor are located sequentially between the second air storage tank and the air heater.

[0019] The first temperature sensor is located between the air heater and the temperature mixer.

[0020] In at least one embodiment of this application, the measurement and control unit includes: a second temperature sensor, a second pressure sensor, and a third high-temperature regulating valve disposed on the third pipeline, wherein,

[0021] The second temperature sensor and the second pressure sensor are installed inside the engine casing;

[0022] The third high-temperature regulating valve is located between the engine casing test module and the exhaust tower.

[0023] In at least one embodiment of this application, the measurement and control unit includes a second high-temperature regulating valve disposed on the fourth pipeline.

[0024] In at least one embodiment of this application, the ambient temperature high pressure air pressure value in the ambient temperature high pressure air subsystem is slightly higher than the high temperature high pressure air pressure value in the high temperature high pressure air subsystem.

[0025] In at least one embodiment of this application, the flow rate of ambient temperature high-pressure air entering the temperature mixer from the ambient temperature high-pressure air subsystem is equal to the flow rate of high temperature high-pressure air discharged from the fourth pipeline of the hot and cold air mixing subsystem.

[0026] In at least one embodiment of this application,

[0027] The airflow into the engine casing is controlled by the PLC controller, the second flow meter, the ambient temperature ball valve, the first flow meter, the first high temperature regulating valve, and the second high temperature regulating valve.

[0028] The pressure load inside the engine casing is controlled by the PLC controller, the ambient temperature ball valve, the second pressure sensor, and the third high temperature regulating valve.

[0029] The temperature load entering the engine casing is controlled by the PLC controller, the second flow meter, the first flow meter, the first temperature sensor, the second temperature sensor, the ambient temperature ball valve, the first high temperature regulating valve, the second high temperature regulating valve, and the third high temperature regulating valve.

[0030] The second aspect of this application provides a method for testing the high-temperature and high-pressure strength of an engine casing based on an air medium, the method being based on the air-medium-based high-temperature and high-pressure strength testing system for an engine casing as described above, comprising:

[0031] Step 1: Obtain the test flow rate and test temperature for the high temperature and high pressure strength test of the engine casing, and determine the target flow rate and target temperature of the high temperature and high pressure air subsystem. Define the target flow rate as slightly higher than the test flow rate and the target temperature as slightly higher than the test temperature.

[0032] Step 2: Closed-loop control of the target flow rate of the high-temperature and high-pressure air subsystem is achieved through the PLC controller, the second flow meter, and the ambient temperature ball valve; closed-loop control of the target temperature of the high-temperature and high-pressure air subsystem is achieved through the PLC controller, the heating power of the air heater, and the first temperature sensor.

[0033] Step 3: Close the first high temperature regulating valve and the second high temperature regulating valve, and open the third high temperature regulating valve, so that the high temperature and high pressure air at the outlet of the temperature mixer flows through the engine casing through the third pipeline, and works with the PLC controller and the second temperature sensor to realize closed-loop loading control of the temperature load of the engine casing.

[0034] Step 4: When the temperature load of the engine casing gradually rises to near the test temperature, open and gradually increase the opening of the first high temperature regulating valve and the second high temperature regulating valve, and during the temperature stabilization process, adjust the opening of the first high temperature regulating valve and the second high temperature regulating valve to stabilize the temperature load at the target temperature.

[0035] Step 5: During the temperature load loading process, based on the functional relationship between temperature load and pressure load, the opening of the third high temperature regulating valve is gradually reduced to realize the loading of pressure load inside the engine casing. In conjunction with the PLC controller, the ambient temperature ball valve, the second pressure sensor and the third high temperature regulating valve, closed-loop loading control of pressure load inside the engine casing is realized.

[0036] During the pressure load loading process, the air flow rate inside the engine casing decreases, which leads to a decrease in temperature load. At this time, the temperature load of the engine casing is kept stable by reducing the flow rate of normal temperature high-pressure air.

[0037] When the temperature load of the engine casing is higher than the target temperature, the temperature load of the engine casing is maintained at the target temperature by increasing the flow rate of normal temperature high-pressure air.

[0038] The invention has at least the following beneficial technical effects:

[0039] The air-medium-based engine casing high-temperature and high-pressure strength testing system of this application can realize the real simulation of the high-temperature and high-pressure load environment of the engine casing structure under test conditions, and can meet the strength test verification requirements of the engine casing under actual working load levels. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of an air-medium-based high-temperature and high-pressure strength testing system for an engine casing, according to one embodiment of this application.

[0041] Figure 2 This is a control principle diagram of an air-medium-based engine casing high-temperature and high-pressure strength test system according to one embodiment of this application. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limiting the scope of protection of this application.

[0044] The following is in conjunction with the appendix Figures 1 to 2 This application will be described in further detail.

[0045] The first aspect of this application provides a high-temperature and high-pressure strength testing system for an engine casing based on air medium, comprising: a normal temperature and high-pressure air subsystem, a high-temperature and high-pressure air subsystem, a hot and cold air mixing subsystem, and a temperature and pressure load measurement and control subsystem.

[0046] Specifically, such as Figure 1 As shown, the ambient temperature high-pressure air subsystem includes a first pipeline and, sequentially from the first end to the second end of the first pipeline, a first air compressor, a first oil-gas separator, a first dryer, and a first air tank. This subsystem primarily provides ambient temperature high-pressure air for testing. The high-temperature high-pressure air subsystem includes a second pipeline and, sequentially from the first end to the second end of the second pipeline, a second air compressor, a second oil-gas separator, a second dryer, a second air tank, and an air heater. This subsystem primarily provides high-temperature high-pressure air for testing. The hot and cold air mixing subsystem includes a third pipeline, a fourth pipeline, and, via the third pipeline… The first to the second end of the pipeline are sequentially arranged a temperature mixer, an engine casing, and an exhaust tower. The temperature mixer is connected to the second end of the first pipeline, the second end of the second pipeline, and the first end of the fourth pipeline. The second end of the fourth pipeline is connected to the exhaust tower. The hot and cold air mixing subsystem is mainly used to achieve rapid loading and unloading of temperature loads, thereby improving test efficiency. The temperature and pressure load measurement and control subsystem includes a PLC controller and multiple measurement and control units set on the first, second, third, and fourth pipelines. The temperature and pressure load measurement and control subsystem is mainly used to achieve accurate measurement and coordinated control of the temperature and pressure loads of the generator casing.

[0047] In a preferred embodiment of this application, the measurement and control unit includes: a first ambient temperature manual valve, a first flow meter, a third pressure sensor, and a first high temperature regulating valve installed on the first pipeline. The first ambient temperature manual valve is located between the first dryer and the first air storage tank; the first flow meter, the third pressure sensor, and the first high temperature regulating valve are sequentially located between the first air storage tank and the temperature mixer. The ambient temperature high-pressure air subsystem mainly provides ambient temperature (cold) high-pressure air used for mixing hot and cold air. During operation, high-pressure air is obtained from the first air compressor, passes through the first oil-gas separator and the first dryer, undergoes oil-gas separation and drying respectively, and then enters the first air storage tank for pressure stabilization. When ambient temperature (cold) high-pressure air needs to be mixed to adjust the temperature load during the test, the first high temperature regulating valve is opened. Under the control of the secondary incoming air flow controller module of the PLC controller, the ambient temperature high-pressure air enters the temperature mixer via the first flow meter and the first high temperature regulating valve. Furthermore, the ambient temperature high-pressure air pressure in the ambient temperature high-pressure air subsystem is slightly higher than that in the high temperature high-pressure air subsystem to ensure that the ambient temperature (cold) high-pressure air can smoothly enter the temperature mixer and participate in the rapid adjustment of the test temperature load. Advantageously, in this embodiment, a check valve is added between the third pressure sensor in the first pipeline and the first high-temperature regulating valve to prevent high-temperature air from flowing back into the ambient temperature pipeline.

[0048] In a preferred embodiment of this application, the measurement and control unit includes: a second ambient temperature manual valve, a third ambient temperature manual valve, an ambient temperature ball valve, a second flow meter, a first pressure sensor, and a first temperature sensor, all disposed on the second pipeline. The second ambient temperature manual valve is located between the second dryer and the second air tank; the third ambient temperature manual valve, the ambient temperature ball valve, the second flow meter, and the first pressure sensor are sequentially located between the second air tank and the air heater; and the first temperature sensor is located between the air heater and the temperature mixer. The high-temperature, high-pressure air subsystem primarily provides high-temperature, high-pressure air for applying test temperature and pressure loads. During operation, the subsystem first provides high-pressure air slightly higher than the test pressure load from the second air compressor. After oil-gas separation and drying by the second oil-gas separator and the second dryer, the air is pressure-stabilized in the second air tank. Then, high-temperature air slightly higher than the test temperature load is obtained by the air heater. Finally, the high-temperature, high-pressure air flows through the temperature mixer and ultimately enters the engine casing. The engine casing temperature load is applied using convective heat transfer between the high-temperature, high-pressure air and the engine casing wall, and the pressure load is simulated based on the high-temperature, high-pressure air. To ensure stable air temperature at the air heater outlet, the air flow rate through the air heater is kept constant during the test. Closed-loop control of the air heater outlet air temperature is achieved by the first temperature sensor at the air heater outlet, the heating power sensor, and the air temperature controller module of the PLC controller.

[0049] In a preferred embodiment of this application, the measurement and control unit includes: a second temperature sensor, a second pressure sensor, and a third high-temperature regulating valve disposed on a third pipeline, wherein the second temperature sensor and the second pressure sensor are installed inside the engine casing; the third high-temperature regulating valve is located between the engine casing and the exhaust tower, and also includes a second high-temperature regulating valve disposed on a fourth pipeline. The hot and cold air mixing subsystem mainly realizes rapid response to temperature load during the test and improves the stability of the test temperature load. Especially for the casing temperature cyclic fatigue test, it can significantly reduce the casing temperature load unloading time and improve test efficiency. The temperature mixer is a two-inlet, two-outlet sealed structure. The mixing structure is designed internally according to the airflow direction to ensure that the air can be mixed uniformly inside the temperature mixer. The high-temperature and high-pressure air generated by the high-temperature and high-pressure air subsystem is the main inflow, and the normal-temperature and high-pressure air generated by the normal-temperature and high-pressure subsystem is the secondary inflow, both entering the temperature mixer. After mixing, the main air enters the engine casing, and the excess air is discharged into the exhaust tower through the venting bypass via the second high-temperature regulating valve. Advantageously, in this embodiment, in order to ensure the stability of the internal pressure load of the engine casing, the flow rate of the ambient high-pressure air entering the temperature mixer from the secondary inlet should be equal to the flow rate of the high-temperature high-pressure air discharged from the exhaust bypass.

[0050] The air-medium-based engine casing high-temperature and high-pressure strength testing system of this application includes a temperature and pressure load measurement and control subsystem that primarily achieves accurate testing and coordinated loading control of temperature and pressure loads during the high-temperature and high-pressure strength test of the casing. Generally, the overall control strategy for temperature and pressure loads is to use temperature load as the primary variable and pressure load as the secondary variable (i.e., pressure load follows temperature load). Coordinated loading control of the casing temperature load is achieved by adjusting the airflow and temperature entering the casing using a temperature load control PLC. Specifically, the airflow entering the engine casing is controlled by a combination of a primary incoming airflow controller (which adjusts the ambient temperature ball valve based on feedback from the second flow meter) and a secondary incoming airflow controller (which adjusts the first and second high-temperature regulating valves based on feedback from the first flow meter). The pressure load control PLC achieves coordinated loading control of the pressure load inside the engine casing. Specifically, the pressure load control PLC coordinates the control of the third high-temperature regulating valve and the normal-temperature ball valve based on the feedback from the second pressure sensor, thereby achieving accurate simulation of the casing pressure load. The temperature load entering the engine casing is controlled by the casing air temperature controller module of the PLC controller, the second flow meter, the first flow meter, the first temperature sensor, the second temperature sensor, the normal-temperature ball valve, the first high-temperature regulating valve, the second high-temperature regulating valve, and the third high-temperature regulating valve.

[0051] Based on the aforementioned air-medium-based engine casing high-temperature and high-pressure strength test system, a second aspect of this application provides an air-medium-based engine casing high-temperature and high-pressure strength test method, comprising:

[0052] Step 1: Obtain the test flow rate and test temperature for the high-temperature and high-pressure strength test of the engine casing, and determine the target flow rate and target temperature of the high-temperature and high-pressure air subsystem. Define the target flow rate as slightly higher than the test flow rate and the target temperature as slightly higher than the test temperature. The test flow rate and test temperature for the high-temperature and high-pressure strength test of the engine casing are calculated based on the test casing temperature load, internal volume, and heating time.

[0053] Step 2: Achieve closed-loop control of the target flow rate of the high-temperature and high-pressure air subsystem through the PLC controller, the second flow meter, and the ambient temperature ball valve; achieve closed-loop control of the target temperature of the high-temperature and high-pressure air subsystem through the PLC controller, the heating power of the air heater, and the first temperature sensor.

[0054] Step 3: Close the first high temperature regulating valve and the second high temperature regulating valve, and open the third high temperature regulating valve so that the high temperature and high pressure air at the outlet of the temperature mixer flows through the engine casing through the third pipeline, and works with the PLC controller and the second temperature sensor to realize closed-loop loading control of the temperature load of the engine casing.

[0055] Step 4: When the temperature load of the engine casing gradually rises to near the test temperature, open and gradually increase the opening of the first high temperature regulating valve and the second high temperature regulating valve. During the temperature stabilization process, adjust the opening of the first high temperature regulating valve and the second high temperature regulating valve to stabilize the temperature load at the target temperature.

[0056] Step 5: During the temperature load loading process, based on the functional relationship between temperature load and pressure load, gradually reduce the opening of the third high temperature regulating valve to realize the loading of pressure load inside the engine casing. In conjunction with the PLC controller, ambient temperature ball valve, second pressure sensor and third high temperature regulating valve, realize closed-loop loading control of pressure load inside the engine casing.

[0057] During the pressure load loading process, the temperature load will decrease due to the reduced air flow rate inside the engine casing. At this time, the temperature load of the engine casing is kept stable by reducing the flow rate of normal temperature high pressure air.

[0058] When the temperature load of the engine casing is higher than the target temperature, the temperature load of the engine casing is maintained at the target temperature by increasing the flow rate of normal temperature high-pressure air.

[0059] The air-medium-based high-temperature and high-pressure strength test method for engine casings in this application can accelerate the loading and unloading rate of casing temperature load by continuously adjusting the opening of high-temperature regulating valve 1 and high-temperature regulating valve 2 during casing temperature cyclic fatigue tests, thereby significantly increasing the test frequency.

[0060] This application discloses a high-temperature and high-pressure strength testing system and method for engine casings based on air media. It achieves high-precision coupled loading control of temperature and pressure loads on the engine casing using a three-layer nested closed-loop control strategy. By utilizing the mixing of hot and cold air, it increases the loading and unloading rate of temperature loads, thereby significantly shortening the test cycle and increasing the test loading frequency. This application enables coupled loading and coordinated control in high-temperature and high-pressure environments based on air media, solving the problem of insufficient strength verification capability for hot-end casing components of aero-engines under high-temperature and high-pressure environments. It strongly supports the design finalization and strength evaluation of aero-engine casing structures in my country.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-temperature and high-pressure strength testing system for engine casings based on air medium, characterized in that, include: A normal temperature high pressure air subsystem includes a first pipeline and a first air compressor, a first oil-gas separator, a first dryer, and a first air storage tank arranged sequentially from the first end to the second end of the first pipeline; The high-temperature and high-pressure air subsystem includes a second pipeline and a second air compressor, a second oil-gas separator, a second dryer, a second air tank, and an air heater, which are sequentially arranged from the first end to the second end of the second pipeline. A hot and cold air mixing subsystem includes a third pipeline, a fourth pipeline, and a temperature mixer, an engine casing, and an exhaust tower arranged sequentially from the first end to the second end of the third pipeline. The temperature mixer is connected to the second end of the first pipeline, the second end of the second pipeline, and the first end of the fourth pipeline, and the second end of the fourth pipeline is connected to the exhaust tower. The temperature and pressure load measurement and control subsystem includes a PLC controller and multiple measurement and control units installed on the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline.

2. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 1, characterized in that, The measurement and control unit includes: a first ambient temperature manual valve, a first flow meter, a third pressure sensor, and a first high temperature regulating valve installed on the first pipeline. The first ambient temperature manual valve is located between the first dryer and the first gas storage tank; The first flow meter, the third pressure sensor, and the first high-temperature regulating valve are located sequentially between the first gas storage tank and the temperature mixer.

3. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 2, characterized in that, A check valve is also installed on the first pipeline, and the check valve is located between the third pressure sensor and the first high-temperature regulating valve.

4. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 3, characterized in that, The measurement and control unit includes: a second ambient temperature manual valve, a third ambient temperature manual valve, an ambient temperature ball valve, a second flow meter, a first pressure sensor, and a first temperature sensor, all installed on the second pipeline. The second ambient temperature manual valve is located between the second dryer and the second gas storage tank; The third ambient temperature manual valve, the ambient temperature ball valve, the second flow meter, and the first pressure sensor are located sequentially between the second air storage tank and the air heater. The first temperature sensor is located between the air heater and the temperature mixer.

5. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 4, characterized in that, The measurement and control unit includes: a second temperature sensor, a second pressure sensor, and a third high-temperature regulating valve installed on the third pipeline, wherein... The second temperature sensor and the second pressure sensor are installed inside the engine casing; The third high-temperature regulating valve is located between the engine casing and the exhaust tower.

6. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 5, characterized in that, The measurement and control unit includes a second high-temperature regulating valve installed on the fourth pipeline.

7. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 6, characterized in that, The ambient temperature high pressure air pressure value in the ambient temperature high pressure air subsystem is slightly higher than the high temperature high pressure air pressure value in the high temperature high pressure air subsystem.

8. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 7, characterized in that, The flow rate of ambient temperature high-pressure air entering the temperature mixer from the ambient temperature high-pressure air subsystem is equal to the flow rate of high temperature high-pressure air discharged from the fourth pipeline of the hot and cold air mixing subsystem.

9. The air-medium-based high-temperature and high-pressure strength testing system for engine casings according to claim 8, characterized in that, The airflow into the engine casing is controlled by the PLC controller, the second flow meter, the ambient temperature ball valve, the first flow meter, the first high temperature regulating valve, and the second high temperature regulating valve. The pressure load inside the engine casing is controlled by the PLC controller, the ambient temperature ball valve, the second pressure sensor, and the third high temperature regulating valve. The temperature load entering the engine casing is controlled by the PLC controller, the second flow meter, the first flow meter, the first temperature sensor, the second temperature sensor, the ambient temperature ball valve, the first high temperature regulating valve, the second high temperature regulating valve, and the third high temperature regulating valve.

10. A method for testing the high-temperature and high-pressure strength of an engine casing based on an air medium, wherein the method is based on the high-temperature and high-pressure strength testing system for an engine casing based on an air medium as described in claim 9, characterized in that... include: Step 1: Obtain the test flow rate and test temperature for the high temperature and high pressure strength test of the engine casing, and determine the target flow rate and target temperature of the high temperature and high pressure air subsystem. Define the target flow rate as slightly higher than the test flow rate and the target temperature as slightly higher than the test temperature. Step 2: Closed-loop control of the target flow rate of the high-temperature and high-pressure air subsystem is achieved through the PLC controller, the second flow meter, and the ambient temperature ball valve; closed-loop control of the target temperature of the high-temperature and high-pressure air subsystem is achieved through the PLC controller, the heating power of the air heater, and the first temperature sensor. Step 3: Close the first high temperature regulating valve and the second high temperature regulating valve, and open the third high temperature regulating valve, so that the high temperature and high pressure air at the outlet of the temperature mixer flows through the engine casing through the third pipeline, and works with the PLC controller and the second temperature sensor to realize closed-loop loading control of the temperature load of the engine casing. Step 4: When the temperature load of the engine casing gradually rises to near the test temperature, open and gradually increase the opening of the first high temperature regulating valve and the second high temperature regulating valve, and during the temperature stabilization process, adjust the opening of the first high temperature regulating valve and the second high temperature regulating valve to stabilize the temperature load at the target temperature. Step 5: During the temperature load loading process, based on the functional relationship between temperature load and pressure load, the opening of the third high temperature regulating valve is gradually reduced to realize the loading of pressure load inside the engine casing. In conjunction with the PLC controller, the ambient temperature ball valve, the second pressure sensor and the third high temperature regulating valve, closed-loop loading control of pressure load inside the engine casing is realized. During the pressure load loading process, the air flow rate inside the engine casing decreases, which leads to a decrease in temperature load. At this time, the temperature load of the engine casing is kept stable by reducing the flow rate of normal temperature high-pressure air. When the temperature load of the engine casing is higher than the target temperature, the temperature load of the engine casing is maintained at the target temperature by increasing the flow rate of normal temperature high-pressure air.

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