A high temperature calibration device for air flow with a wide range of working conditions

Abstract

The invention discloses a high-temperature airflow calibration device with a wide range of working conditions, comprising a thermal calibration wind tunnel body, a resistance heater, an electromagnetic induction heater, a combustion chamber and an oil supply system, wherein the thermal calibration wind tunnel body is connected to the resistance heater, the electromagnetic induction heater and the combustion chamber respectively, and the oil supply system is connected to the combustion chamber; the thermal calibration wind tunnel body is used to provide an airflow field that meets certain speed and pressure requirements for the airflow high-temperature calibration device, the resistance heater is used to preheat the airflow to a certain temperature, the electromagnetic induction heater is used to further preheat the airflow from the resistance heater, the combustion chamber is used to mix and burn kerosene and the airflow from the electromagnetic induction heater to generate a high-temperature gas flow, and provide an airflow field that meets certain temperature requirements for the airflow high-temperature calibration device, and the oil supply system is used to supply kerosene as fuel to the combustion chamber. The invention can be adjusted within a wide range of airflow temperature, speed and pressure, and is suitable for 2300K airflow high-temperature calibration.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature measurement and relates to an airflow high-temperature calibration device with a wide working range. Background Art

[0002] In the development, production testing and use of various high-performance engines, gas turbines, etc., airflow high temperature is a key test parameter, usually used for performance evaluation, status monitoring, combustion diagnosis, etc. of engines and gas turbines. High-temperature airflow temperature sensors are used for high-temperature airflow temperature measurement. Since high-temperature airflow temperature sensors have various steady-state and dynamic errors in actual use, they need to be calibrated on airflow high-temperature calibration devices. The high-temperature airflow temperature sensor has a wide range of operating conditions, and it is hoped that its operating conditions can be simulated during calibration. Therefore, the airflow high-temperature calibration device is required to have a sufficiently wide adjustable operating range and be able to operate continuously for a long time. This is also the difference between the airflow high-temperature calibration device and general high-temperature test equipment. In addition, the difference from general high-temperature test equipment is that the airflow high-temperature calibration device needs to have good temperature field and flow field quality. For this reason, it is usually necessary to add heat-resistant insulation and rectification sections, which puts higher requirements on heating capacity and material high-temperature resistance.

[0003] Existing high-temperature airflow calibration devices usually use a two-stage combustion method or a combination of a first-stage resistance heating and a first-stage combustion method to produce a relatively wide range of airflow temperatures. In order to ensure sufficient combustion within a wide speed range, cold bypass and hot bypass structures are usually added. However, such a design is only applicable to normal pressure conditions. For high-pressure conditions, it is difficult to maintain high pressure due to the existence of hot bypass. In addition, when using a two-stage combustion method and a combination of a first-stage resistance heating and a first-stage combustion method, it is difficult to achieve an airflow temperature of 2300K in the test section when using a mixture of kerosene and air for combustion. Existing high-temperature section lining materials cannot be used at temperatures above 2300K. In summary, the current high-temperature airflow calibration device cannot achieve full-range regulation of airflow temperature, speed, and pressure. Summary of the invention

[0004] The purpose of the present invention is to provide an airflow high temperature calibration device with a wide operating range, which can be adjusted within a wider range of airflow temperature, speed and pressure and is suitable for airflow high temperature calibration at 2300K.

[0005] One aspect of the present invention provides an airflow high temperature calibration device, comprising a thermal calibration wind tunnel body, a resistance heater, an electromagnetic induction heater, a combustion chamber and a fuel supply system.

[0006] The thermal calibration wind tunnel body is connected to the resistance heater, electromagnetic induction heater and combustion chamber respectively, and the fuel supply system is connected to the combustion chamber;

[0007] The thermal calibration wind tunnel body is used to provide an airflow field that meets certain speed and pressure requirements for the airflow high-temperature calibration device, the resistance heater is used to preheat the airflow to a certain temperature, the electromagnetic induction heater is used to further preheat the airflow from the resistance heater, the combustion chamber is used to mix and burn kerosene and the airflow from the electromagnetic induction heater to generate a high-temperature gas flow, thereby providing an airflow field that meets certain temperature requirements for the airflow high-temperature calibration device, and the fuel supply system is used to supply kerosene as fuel to the combustion chamber.

[0008] Preferably, the thermal calibration wind tunnel body comprises an air intake valve, an air intake pipeline, a U-shaped expansion joint, a primary pressure diffuser section, a primary stabilization section, a primary contraction section, a secondary pressure diffuser section, a secondary stabilization section, a secondary contraction section, a test section, a diffusion section, an exhaust section, and an exhaust valve;

[0009] Among them, the intake valve is connected to the inlet of the intake pipeline, the outlet of the intake pipeline is connected to the inlet of the resistance heater, the outlet of the resistance heater is connected to the inlet of the U-shaped expansion joint, the outlet of the U-shaped expansion joint is connected to the inlet of the electromagnetic induction heater, the outlet of the electromagnetic induction heater is connected to the inlet of the first-stage diffuser section, the first-stage diffuser section, the first-stage stabilization section, the first-stage contraction section, the combustion chamber, the second-stage diffuser section, the second-stage stabilization section, the second-stage contraction section, the test section, the diffusion section, the exhaust section, and the exhaust valve are connected end to end in sequence.

[0010] Preferably, the linings of the secondary expansion section, the secondary stabilization section and the secondary contraction section are all made of high-temperature modified ceramic material silicon carbide-zirconium boride-hafnium oxide, the outside of the lining is covered with 10 to 200 mm thick zirconium oxide insulation cotton, and the outside of the insulation cotton is covered with a metal water-cooled wall; the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the secondary contraction section is 7 to 35, and the secondary contraction section can be replaced with 2 to 3 outlet diameters.

[0011] Preferably, the electromagnetic induction heater comprises a heating core, a heat-insulating layer, a heat-insulating shell, an induction coil, a magnetic yoke, a pressure-resistant shell, and a power supply system;

[0012] Among them, the power supply system is connected to the induction coil, the thermal insulation layer is covered on the outer layer of the heating core, the thermal insulation shell is covered on the outer layer of the thermal insulation layer, the induction coil is wrapped on the outer layer of the thermal insulation shell, the magnetic yoke is covered on the outer layer of the induction coil, the pressure-resistant shell is covered on the outer layer of the magnetic yoke, and the inlet of the pressure-resistant shell is nested outside the outlet of the heating core.

[0013] Preferably, the heating core is a round hole honeycomb structure with a hole diameter of 3 to 6 mm and a hole spacing of 2 to 4 mm. The cross-sectional outer contour of the heating core is a rounded rectangle with an aspect ratio of 1.5 to 2 and a ratio of the fillet radius to the rectangle width of 0.1 to 0.3.

[0014] Preferably, the product of the number of circular holes in the heating core and the length of the core is Calculation, where n is the number of circular holes, is the core length in mm, C is the core length coefficient in the range of 42000 to 43000 mm, Ma is the incoming flow Mach number in the range of 0.1 to 0.8, and p is the incoming flow static pressure in Pa.

[0015] Preferably, the combustion chamber comprises a nozzle, a swirler, a flame tube, an outer casing, an igniter, a front flange, and a rear flange;

[0016] Among them, the nozzle and the swirler are connected to the front flange respectively, the swirler is located downstream of the nozzle, the inlets of the flame tube and the outer casing are connected to the front flange respectively, and the outlets are connected to the rear flange respectively, the outer casing is nested outside the flame tube, and the igniter is connected to the outer casing and the flame tube respectively.

[0017] Preferably, the number of nozzles is 12, which are divided into 3 levels. Three nozzles work under low working conditions, six nozzles work under medium working conditions, and all 12 nozzles work under high working conditions. The number of swirlers is 12, each swirler includes 15 to 18 straight blades, the swirl angle is 45°, the inlet diameter of the swirler is 18 to 22 mm, and the outlet diameter is 24 to 28 mm. The flame tube adopts a divergent small hole cooling wall structure with a hole diameter of 0.4 to 0.6 mm, the number of holes is 9000 to 10000, and the axial spacing and circumferential spacing of the holes are both 5 to 7 mm.

[0018] Preferably, the airflow high-temperature calibration device also includes a water cooling system and a measurement and control system, which are connected to the thermal calibration wind tunnel body. The water cooling system is used to cool the high-temperature section of the airflow high-temperature calibration device, and the measurement and control system is used to collect calibration data and monitoring data, and to adjust and control the operating conditions of the airflow high-temperature calibration device.

[0019] The high-temperature airflow calibration device with a wide operating range according to the above aspects of the present invention can be adjusted within a wider range of airflow temperature, speed and pressure, and is suitable for high-temperature airflow calibration at 2300K. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. 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 work:

[0021] Figure 1 It is a system block diagram of a high-temperature airflow calibration device with a wide operating range according to an embodiment of the present invention;

[0022] Figure 2This is a schematic diagram of the structure of a thermal calibration wind tunnel body according to an embodiment of the present invention (including a resistance heater, an electromagnetic induction heater and a combustion chamber);

[0023] Figure 3 This is a schematic structural diagram of an electromagnetic induction heater according to an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of a combustion chamber according to an embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of a heating core according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a nozzle according to an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the structure of a cyclone according to an embodiment of the present invention;

[0028] Figure 8 It is a structural schematic diagram of a flame tube according to an embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the layered structure of a secondary diffuser section, a secondary stabilization section and a secondary contraction section according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The embodiments of the present invention provide a high temperature airflow calibration device with a wide range of working conditions, which is suitable for high temperature airflow calibration at 2300K. Figure 1 As shown, an airflow high-temperature calibration device with a wide operating range according to an embodiment of the present invention includes a thermal calibration wind tunnel body 1, a resistance heater 2, an electromagnetic induction heater 3, a combustion chamber 4, and a fuel supply system 5.

[0032] The main function of the thermal calibration wind tunnel body 1 is to provide a high-quality airflow field that meets certain speed and pressure requirements for the calibration device; the main function of the resistance heater 2 is to preheat the incoming air to a certain temperature and provide an inlet temperature condition for the electromagnetic induction heater 3; the main function of the electromagnetic induction heater 3 is to further preheat the incoming air (the airflow from the resistance heater 2) and provide an inlet temperature condition for the combustion chamber 4; the main function of the combustion chamber 4 is to generate a high-temperature combustion gas flow by mixing and burning kerosene and preheated incoming air (the airflow from the electromagnetic induction heater 3), thereby providing an airflow field that meets certain temperature requirements for the calibration device; the main function of the oil supply system 5 is to supply kerosene as fuel to the combustion chamber 4.

[0033] The airflow high-temperature calibration device of the embodiment of the present invention may also include a water cooling system 6 and a measurement and control system 7. The main function of the water cooling system 6 is to cool the high-temperature section of the calibration device to ensure its safe and reliable operation; the main function of the measurement and control system 7 is to collect calibration data and monitoring data, and be responsible for the adjustment and control of the working conditions of the calibration device.

[0034] The connection relationship of the various components of the airflow high-temperature calibration device of the embodiment of the present invention is as follows: the thermal calibration wind tunnel body 1 is respectively connected to the resistance heater 2, the electromagnetic induction heater 3, the combustion chamber 4, the water cooling system 6, and the measurement and control system 7, and the oil supply system 5 is connected to the combustion chamber 4.

[0035] like Figure 2 As shown, the thermal calibration wind tunnel body 1 includes an air intake valve 8, an air intake pipeline 9, a U-shaped expansion joint 10, a first-stage expansion section 11, a first-stage stabilization section 12, a first-stage contraction section 13, a second-stage expansion section 14, a second-stage stabilization section 15, a second-stage contraction section 16, a test section 17, a diffusion section 18, an exhaust section 19, and an exhaust valve 20;

[0036] The connection relationship of the various components of the thermal calibration wind tunnel body 1 is as follows: the air intake valve 8 is connected to the inlet of the air intake pipeline 9, the outlet of the air intake pipeline 9 is connected to the inlet of the resistance heater 2, the outlet of the resistance heater 2 is connected to the inlet of the U-shaped expansion joint 10, the outlet of the U-shaped expansion joint 10 is connected to the inlet of the electromagnetic induction heater 3, the outlet of the electromagnetic induction heater 3 is connected to the inlet of the first-stage diffuser 11, the first-stage diffuser 11, the first-stage stabilization section 12, the first-stage contraction section 13, the combustion chamber 4, the second-stage diffuser 14, the second-stage stabilization section 15, the second-stage contraction section 16, the test section 17, the diffusion section 18, the exhaust section 19, and the exhaust valve 20 are connected end to end in sequence, and the above-mentioned parts are connected by flanges.

[0037] like Figure 3As shown, the electromagnetic induction heater 3 includes a heating core 21 , a heat preservation layer 22 , a heat insulating shell 23 , an induction coil 24 , a magnetic yoke 25 , a pressure-resistant shell 26 , and a power supply system 27 .

[0038] The connection relationship between the various components of the electromagnetic induction heater 3 is as follows: the power supply system 27 is connected to the induction coil 24, the thermal insulation layer 22 is coated on the outer layer of the heating core 21, the thermal insulation shell 23 is coated on the outer layer of the thermal insulation layer 22, the induction coil 24 is wound on the outer layer of the thermal insulation shell 23, the yoke 25 is coated on the outer layer of the induction coil 24, the pressure-resistant shell 26 is coated on the outer layer of the yoke 25, and the inlet of the pressure-resistant shell 26 is nested outside the outlet of the heating core 21.

[0039] like Figure 4 As shown, the combustion chamber 4 includes a nozzle 28 , a swirler 29 , a flame tube 30 , an outer casing 31 , an igniter 32 , a front flange 33 , and a rear flange 34 .

[0040] The connection relationship between the various components of the combustion chamber 4 is as follows: the nozzle 28 and the swirler 29 are respectively connected to the front flange 33, the swirler 29 is located downstream of the nozzle 28, the inlets of the flame tube 30 and the outer casing 31 are respectively connected to the front flange 33, and the outlets are respectively connected to the rear flange 34, the outer casing 31 is nested outside the flame tube 30, and the igniter 32 is respectively connected to the outer casing 31 and the flame tube 30.

[0041] In one embodiment, the airflow high-temperature calibration device with a wide operating range of the embodiment of the present invention first heats the incoming air from room temperature to 920K by the resistance heater 2, then heats the incoming air from 920K to 1100K by the electromagnetic induction heater 3, and finally mixes the preheated incoming air with kerosene and burns it in the combustion chamber 4 to raise the temperature to 2500K. Taking into account the heat loss along the way, the airflow temperature in the test section 17 can reach 2300K.

[0042] like Figure 5 As shown, the heating core 21 of the electromagnetic induction heater 3 is a circular hole honeycomb structure, the hole diameter is (3-6) mm, the hole spacing is (2-4) mm, the cross-sectional outer contour of the heating core 21 is a rounded rectangle, the aspect ratio of the rectangle is 1.5-2, the ratio of the fillet radius to the rectangle width is 0.1-0.3, and the product of the number of circular holes and the core length is expressed as Calculation, where n is the number of circular holes, l is the core length in mm, C is the core length coefficient in the range of (42000-43000) mm, Ma is the incoming flow Mach number in the range of 0.1-0.8, and p is the incoming flow static pressure in Pa.

[0043] In one embodiment, the heating core 21 of the electromagnetic induction heater 3 is a circular hole honeycomb structure with a length of 800 mm, and the outer contour of the cross section is a rounded rectangle. The length and width of the rectangle are 900 mm and 600 mm respectively, the radius of the fillet is 120 mm, the diameter of the hole is 4 mm, the number is 680, and the hole spacing is 3 mm.

[0044] like Figure 6 As shown, the number of nozzles 28 in the combustion chamber 4 is 12, which are divided into 3 levels. In low working condition, 3 nozzles work, in medium working condition, 6 nozzles work, and in high working condition, all 12 nozzles work. Figure 7 As shown, there are 12 cyclones 29, each of which includes (15-18) straight blades, a swirl angle of 45°, a cyclone inlet diameter of (18-22) mm, and an outlet diameter of (24-28) mm. Figure 8 As shown, the flame tube 33 adopts a divergent small hole cooling wall structure, the hole diameter is (0.4 ~ 0.6) mm, the number of holes is 9000 ~ 10000, and the axial spacing and circumferential spacing of the holes are both (5 ~ 7) mm.

[0045] In one embodiment, each swirler includes 15 straight blades, the swirl angle is 45°, the inlet diameter of the swirler 29 is 20 mm, and the outlet diameter is 26 mm; the flame tube 30 adopts a divergent small hole cooling wall structure with a hole diameter of 0.5 mm, the number of holes is 9000, and the axial spacing and circumferential spacing of the holes are both 6 mm.

[0046] like Fig. 9 As shown, the lining 41 of the secondary expansion section 14, the secondary stabilization section 15, and the secondary contraction section 16 of the thermal calibration wind tunnel body 1 are all made of high-temperature modified ceramic material silicon carbide-zirconium boride-hafnium oxide, and the outer side of the lining is coated with zirconium oxide insulation cotton 42 with a thickness of (10-200) mm, and the outer side of the insulation cotton 42 is coated with a metal water-cooled wall 43; the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the secondary contraction section is 7-35, and the outlet diameter is selected from (2-3) types, which can be replaced before the test to ensure that the airflow velocity can be adjusted within a wider range while the combustion chamber works normally.

[0047] In one embodiment, the lining 41 is coated with 180 mm thick zirconia insulation cotton 42, and the insulation cotton 42 is coated with a metal water-cooled wall 43; there are two secondary contraction sections 16, both with an inlet diameter of 400 mm, and outlet diameters of 70 mm and 100 mm respectively. Before the test, one of the secondary contraction sections is selected for use according to the required air flow velocity range; the calibration device adopts a single-channel direct current structure, and the intake valve 8 and the exhaust valve 20 work in coordination to ensure that the air flow pressure can be adjusted within a wider range.

[0048] The airflow high temperature calibration device with a wide operating range of the above-mentioned embodiment of the present invention has the following beneficial effects:

[0049] 1. In order to solve the problem that the temperature range of the current airflow high-temperature calibration device is not wide enough, the present invention adopts a three-stage heating method of a resistance heater, an electromagnetic induction heater and a combustion chamber, and uses a multiphase ceramic silicon carbide-zirconium boride-hafnium oxide material as an inner lining, and uses zirconium oxide insulation cotton for insulation. It can achieve an airflow high temperature of more than 2300K in the test section, so that the high temperature can be achieved and maintained, and it has the advantage of good temperature field uniformity.

[0050] 2. The present invention ensures that the air flow velocity in the test section can be adjusted within a wide range under the condition of sufficient combustion by means of the three groups of nozzles in the combustion chamber being operated in stages and (2 to 3) secondary contraction sections with different outlet diameters being replaced.

[0051] 3. The present invention adopts a single-channel direct flow structure and does not use cold bypass and hot bypass, thus avoiding the problem of downstream pressure relief. The coordinated operation of the intake valve and the exhaust valve can ensure that the air flow pressure is adjusted within a wider range.

[0052] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high temperature air flow calibration device with a wide operating range, characterized in that: It includes thermal calibration wind tunnel body, resistance heater, electromagnetic induction heater, combustion chamber and fuel supply system. The thermal calibration wind tunnel body is connected to the resistance heater, electromagnetic induction heater and combustion chamber respectively, and the fuel supply system is connected to the combustion chamber; The thermal calibration wind tunnel body is used to provide an airflow field that meets certain speed and pressure requirements for the airflow high-temperature calibration device, the resistance heater is used to preheat the airflow to a certain temperature, the electromagnetic induction heater is used to further preheat the airflow from the resistance heater, the combustion chamber is used to mix and burn kerosene and the airflow from the electromagnetic induction heater to generate a high-temperature gas flow, thereby providing an airflow field that meets certain temperature requirements for the airflow high-temperature calibration device, and the fuel supply system is used to supply kerosene as fuel to the combustion chamber.

2. The airflow high temperature calibration device according to claim 1, characterized in that: The thermal calibration wind tunnel body includes an air intake valve, an air intake pipeline, a U-shaped expansion joint, a first-stage expansion section, a first-stage stability section, a first-stage contraction section, a second-stage expansion section, a second-stage stability section, a second-stage contraction section, a test section, a diffusion section, an exhaust section, and an exhaust valve; Among them, the intake valve is connected to the inlet of the intake pipeline, the outlet of the intake pipeline is connected to the inlet of the resistance heater, the outlet of the resistance heater is connected to the inlet of the U-shaped expansion joint, the outlet of the U-shaped expansion joint is connected to the inlet of the electromagnetic induction heater, the outlet of the electromagnetic induction heater is connected to the inlet of the first-stage diffuser section, the first-stage diffuser section, the first-stage stabilization section, the first-stage contraction section, the combustion chamber, the second-stage diffuser section, the second-stage stabilization section, the second-stage contraction section, the test section, the diffusion section, the exhaust section, and the exhaust valve are connected end to end in sequence.

3. The airflow high temperature calibration device according to claim 2, characterized in that: The linings of the secondary diffuser section, secondary stabilization section and secondary contraction section are all made of high-temperature modified ceramic material silicon carbide-zirconium boride-hafnium oxide. The outside of the lining is covered with 10 to 200 mm thick zirconium oxide insulation cotton, and the outside of the insulation cotton is covered with a metal water-cooled wall. The ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the secondary contraction section is 7 to 35, and the secondary contraction section can be replaced with 2 to 3 outlet diameters.

4. The airflow high temperature calibration device according to any one of claims 1 to 3, characterized in that: The electromagnetic induction heater comprises a heating core, a heat-insulating layer, a heat-insulating shell, an induction coil, a magnetic yoke, a pressure-resistant shell, and a power supply system; Among them, the power supply system is connected to the induction coil, the thermal insulation layer is covered on the outer layer of the heating core, the thermal insulation shell is covered on the outer layer of the thermal insulation layer, the induction coil is wrapped on the outer layer of the thermal insulation shell, the magnetic yoke is covered on the outer layer of the induction coil, the pressure-resistant shell is covered on the outer layer of the magnetic yoke, and the inlet of the pressure-resistant shell is nested outside the outlet of the heating core.

5. The airflow high temperature calibration device according to claim 4, characterized in that: The heating core is a round hole honeycomb structure with a hole diameter of 3 to 6 mm and a hole spacing of 2 to 4 mm. The cross-sectional outer contour of the heating core is a rounded rectangle with an aspect ratio of 1.5 to 2 and a ratio of the fillet radius to the rectangle width of 0.1 to 0.

3.

6. The airflow high temperature calibration device according to claim 5, characterized in that: The product of the number of circular holes in the heating core and the length of the core is Calculation, where n is the number of circular holes, l is the core length in mm, C is the core length coefficient in the range of 42000 to 43000 mm, Ma is the incoming flow Mach number in the range of 0.1 to 0.8, and p is the incoming flow static pressure in Pa.

7. The airflow high temperature calibration device according to any one of claims 1 to 6, characterized in that: The combustion chamber comprises a nozzle, a swirler, a flame tube, an outer casing, an igniter, a front flange, and a rear flange; Among them, the nozzle and the swirler are connected to the front flange respectively, the swirler is located downstream of the nozzle, the inlets of the flame tube and the outer casing are connected to the front flange respectively, and the outlets are connected to the rear flange respectively, the outer casing is nested outside the flame tube, and the igniter is connected to the outer casing and the flame tube respectively.

8. The airflow high temperature calibration device according to claim 7, characterized in that: There are 12 nozzles, which are divided into 3 levels. Three nozzles work under low operating conditions, six nozzles work under medium operating conditions, and all 12 nozzles work under high operating conditions. There are 12 swirlers, each of which includes 15 to 18 straight blades with a swirl angle of 45°. The inlet diameter of the swirler is 18 to 22 mm and the outlet diameter is 24 to 28 mm. The flame tube adopts a divergent small hole cooling wall structure with a hole diameter of 0.4 to 0.6 mm. The number of holes is 9000 to 10000, and the axial and circumferential spacing of the holes are both 5 to 7 mm.

9. The airflow high temperature calibration device according to any one of claims 1 to 8, characterized in that: It also includes a water cooling system and a measurement and control system, which are connected to the thermal calibration wind tunnel body. The water cooling system is used to cool the high-temperature section of the airflow high-temperature calibration device, and the measurement and control system is used to collect calibration data and monitoring data, and to adjust and control the operating conditions of the airflow high-temperature calibration device.

Images