A gas mixing device for air environment simulation test

Abstract

The present invention relates to the field of high-altitude simulation test equipment for aircraft engines, and discloses a gas mixing device for air environment simulation test, including a positive three-way pipe fitting and a mixing structure, wherein the mixing structure is arranged in the positive three-way pipe fitting, and a radial hanging plate is arranged in the main pipe of the positive three-way pipe fitting, and the end of the mixing structure is inserted from the branch pipe of the positive three-way pipe fitting, and contacts with the inner wall of the main pipe after passing through the hanging plate. The mixing structure includes a multi-layer mixing component arranged along the radial direction of the main pipe, a low-pressure gas channel is arranged between two adjacent layers of mixing components, a high-pressure gas channel perpendicular to the low-pressure gas channel is arranged in the mixing component, and a spray structure connecting the low-pressure gas channel and the high-pressure gas channel is opened on the mixing component. The gas mixing device of the present invention can solve the technical problems that the existing mixing device is prone to separation or vortex, the inlet air flow field is extremely uneven, etc., resulting in poor mixing effect, and the mixing device has a large pressure loss and cannot meet the engine inlet pressure requirement.

Description

Technical Field

[0001] The invention relates to the field of high-altitude simulation test equipment for aviation engines, and in particular to a gas mixing device used for aerial environment simulation tests. Background Art

[0002] Airborne simulation tests of aircraft engines have requirements for the temperature and pressure fields of the engine inlet flow field. In the design and construction plans of the airborne environmental simulation test equipment currently under construction or in use at home and abroad, the mixing device structure has two types of layered baffle type or built-in tubular open-hole components. Two or even more airflows with different temperatures enter the mixing device, and flow diversion or forced heat exchange is performed to achieve gas mixing. This mixing method has the defects of high requirements for the inlet air flow field and large pressure loss.

[0003] Existing or under-construction simulation experimental equipment is limited by construction space and the air supply pipeline network is compactly arranged, which makes the straight pipe section at the front end of the mixing device shorter. The airflow entering the mixing device will separate or swirl, and the inlet air flow field will be extremely uneven, resulting in poor mixing effect. The airflow field after mixing cannot meet the requirements of the air environment simulation test, which in turn affects the normal progress of the engine air environment simulation test.

[0004] Furthermore, when simulating the engine air environment, since the engine inlet pressure is very low and the air flow pressure in the air supply network is only slightly higher than normal pressure or is normal pressure, the pressure loss at the mixing device must not be too large, otherwise the engine inlet pressure requirement cannot be guaranteed. Summary of the invention

[0005] In order to solve the technical problems that the existing gas mixing devices are prone to separation or vortexes, the intake air flow field is extremely uneven, etc., resulting in poor mixing effect, and the mixing device has a large pressure loss and cannot meet the engine inlet pressure requirement, the present invention discloses a gas mixing device for an air environment simulation test, the gas mixing device comprises a positive three-way pipe fitting and a mixing structure, and the mixing structure is arranged in the positive three-way pipe fitting.

[0006] Wherein, a radial hanging plate is arranged inside the main pipe of the positive tee pipe fitting, and the end of the mixing structure is inserted from the branch pipe of the positive tee pipe fitting, passes through the hanging plate and contacts the inner wall of the main pipe.

[0007] The mixing structure includes a plurality of mixing components arranged along the radial direction of the main pipe, a low-pressure gas channel is provided between two adjacent layers of the mixing components, a high-pressure gas channel perpendicular to the low-pressure gas channel is provided in the mixing component, and an injection structure connecting the low-pressure gas channel and the high-pressure gas channel is provided on the mixing component.

[0008] Furthermore, the mixing assembly includes at least one mixing unit arranged along the radial direction of the main pipe, the high-pressure gas channel is provided in the mixing unit, and the middle and rear sections of the mixing unit located in the main pipe are provided with a spray hole array, and the spray hole arrays of all the mixing units form the spray structure.

[0009] Furthermore, the injection hole array is arranged at the rear end of the mixing unit along the flow direction of the low-pressure gas.

[0010] Furthermore, the injection hole array includes at least one row of injection parts distributed along the flow direction of the low-pressure gas, each row of the injection parts includes a plurality of injection holes distributed along the flow direction of the high-pressure gas, and the angle between the injection holes and the flow direction of the low-pressure gas is 30~60°.

[0011] Furthermore, when the blending assembly includes a plurality of the blending units, a gap is provided between two adjacent blending units. The purpose of the gap is to leave a margin for the thermal deformation of the blending units when the high-pressure gas is introduced, so as to avoid mutual compression between the two adjacent blending units and damage to the blending units. At the same time, the size of the gap is calculated based on the thermal deformation of the blending units, so that when the gas is blended, the adjacent blending units can be in contact while avoiding mutual compression.

[0012] Furthermore, the cross section of the mixing unit is in a racetrack shape formed by arc segments and straight line segments.

[0013] In an improved embodiment of the above-mentioned gas mixing device, a plurality of guide strips are provided between two adjacent layers of the mixing components and along the flow direction of the high-pressure gas. By providing the guide strips, the low-pressure gas channel between the two adjacent layers of the mixing components can be divided into a plurality of small channels, thereby improving the mixing effect of the low-pressure gas in the low-pressure gas channel and the high-pressure gas ejected from the injection structure.

[0014] In an improved embodiment of the above-mentioned gas mixing device, when mixing high-pressure gas and low-pressure gas, in order to avoid displacement and vibration of the mixing structure due to airflow, affecting the gas mixing effect and causing structural damage to the mixing structure, a limiting structure for limiting the mixing structure is provided on the inner wall of the main pipe.

[0015] In an improved embodiment of the above-mentioned gas mixing device, the gas mixing device also includes an end mounting plate, which is located at the intersection of the branch pipe and the main pipe, and the front end of the mixing structure is inserted into and passes through the mounting hole of the end mounting plate.

[0016] In another improved embodiment of the above-mentioned gas mixing device, the gas mixing device also includes a block, and blocks are provided between the outermost mixing component and the inner wall of the branch pipe and between two adjacent layers of the mixing components. The block can prevent high-pressure gas from flowing into the low-pressure gas from between two adjacent mixing components and between the outermost mixing unit and the inner wall of the branch pipe to affect the mixing of high and low pressure gases.

[0017] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification include at least: the gas mixing device of the present invention can achieve the purpose of improving the mixing effect and reducing the pressure loss by arranging a mixing structure in the positive three-way pipe fitting and designing the mixing structure. The gas mixing device has the following advantages:

[0018] 1. Compared with the traditional mixing principle, the mixing principle of the mixing device of the present invention is as follows: first, the low-pressure gas enters from the main pipe of the positive three-way pipe diameter and flows into the low-pressure gas channel between the mixing components. The high-pressure gas enters from the branch pipe of the positive three-way pipe diameter and flows into the high-pressure gas channel in the mixing component and is then sprayed to the low-pressure gas channel through the injection structure. The high-pressure gas and the low-pressure gas contact in the low-pressure gas channel for the first mixing; secondly, when the mixed gas in each low-pressure gas channel is output from the mixing structure, it is decelerated by pressure expansion and secondary mixing is performed to obtain the final mixed gas. The gas mixing device of the present invention not only changes the mixing mechanism of the natural flow development of the gas supply flow in the long-distance gas supply pipeline in the traditional scheme from the mixing principle, but also effectively improves the mixing effect of the high-pressure gas and the low-pressure gas through the setting of the multi-layer mixing unit.

[0019] 2. When the gas mixing device of the present invention is working, the two high-pressure and low-pressure gases enter the mixing structure through different channels, which can perform initial rectification, flow fragmentation and flow equalization on the airflow, effectively reducing the turbulence of the incoming flow. The flow field can be further uniformed when entering the main pipe after outputting the mixing structure, and the engine inlet flow field quality can meet the standard requirements of total temperature, total pressure and turbulence of ±1.0% within a short distance.

[0020] 3. Most of the traditional mixing devices mainly consider the outlet flow field of the mixed airflow, and the pipeline flow path is relatively long, resulting in a large pressure loss of the mixed airflow (about 20kPa). Compared with the traditional mixing device, the present invention designs a low-pressure gas channel for the entry of low-pressure gas. By setting a guide strip between two adjacent layers of mixing components, the mixed airflow can be rectified and the pressure loss can be reduced to 5kPa, thereby achieving the purpose of greatly reducing the pressure loss of the airflow passing through the mixing device.

[0021] 4. Compared with the structure of the traditional mixing device, the present invention designs the mixing assembly, which is formed by multiple independent mixing units, and an array of injection holes is opened on each mixing unit. If the device needs to be maintained during operation, it is only necessary to cut the mixing unit and the block spot-welded at the end mounting plate, and pull out the mixing unit for maintenance or replacement, which greatly improves the maintainability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Schematic diagram of a gas mixing device along the radial direction of the main pipe of the positive tee pipe fitting in an embodiment of the present invention;

[0024] Figure 2 A top view of the gas mixing device along the radial direction of the branch pipe of the positive tee pipe fitting in an embodiment of the present invention;

[0025] Among them, 1. hanging plate; 2. mixing unit; 21. injection hole; 3. guide strip; 4. end mounting plate; 5. stopper. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0028] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0029] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0030] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0031] The present invention discloses a gas mixing device for air environment simulation test, the gas mixing device comprises a straight three-way pipe fitting and a mixing structure, wherein the mixing structure is arranged in the straight three-way pipe fitting. Specifically, a radial hanging plate 1 can be arranged in the main pipe of the straight three-way pipe fitting, the end of the mixing structure is inserted from the branch pipe of the straight three-way pipe fitting, and contacts with the inner wall of the main pipe after passing through the hanging plate 1, wherein the hanging plate 1 can be arranged in the middle and rear section of the mixing structure, which has the function of supporting the mixing structure and also has the function of limiting. In specific implementation, the upper end of the hanging plate 1 can be fixed on the inner wall of the main pipe, and the lower end can be released and not fixed, and at the same time, a hole through which the mixing structure passes is processed on the hanging plate 1.

[0032] Among them, the mixing structure includes a multi-layer mixing component arranged along the radial direction of the main pipe, a low-pressure gas channel is provided between two adjacent layers of the mixing components, a high-pressure gas channel perpendicular to the low-pressure gas channel is provided in the mixing component, and an injection structure connecting the low-pressure gas channel and the high-pressure gas channel is opened on the mixing component.

[0033] During the air environment simulation test, the high-pressure and low-pressure gases can be mixed through the gas mixing device to obtain the required mixed gas, wherein the low-pressure gas enters the low-pressure gas channel between adjacent mixing components from the main pipe of the positive three-way pipe fitting; the high-pressure gas enters the high-pressure gas channel in the mixing component from the branch pipe of the positive three-way pipe fitting, and is sprayed into the low-pressure gas channel through the injection structure for the first mixing, and then outputs the mixing structure to enter the main pipe for the second mixing to obtain the final mixed gas.

[0034] Further, see Figure 1 and Figure 2 As shown, Figure 1 is a cross-sectional view of the gas mixing device along the radial direction of the main pipe of the positive tee pipe fitting, Figure 2 The top view of the gas mixing device along the radial direction of the branch pipe of the positive tee pipe fitting is shown in FIG. The mixing assembly includes at least one mixing unit 2 arranged along the radial direction of the main pipe, the mixing unit 2 is provided with the high-pressure gas channel, and the middle and rear sections of the mixing unit 2 located in the main pipe are provided with a spray hole array, and the spray hole arrays of all the mixing units 2 form the spray structure. In the present invention, the spray hole array is provided in the middle and rear sections of the mixing unit 2, which can prevent the high-pressure gas from flowing out when in the branch pipe, so as to ensure the mixing effect of the high-pressure and low-pressure gases in the low-pressure gas channel in the main pipe.

[0035] Further, see Figure 2 As shown, the injection hole array is arranged at the rear end of the mixing unit 2 along the flow direction of the low-pressure gas. Preferably, the injection hole array includes at least one row of injection parts distributed along the flow direction of the low-pressure gas, and each row of the injection parts includes a plurality of injection holes 21 distributed along the flow direction of the high-pressure gas, and the angle between the injection holes 21 and the flow direction of the low-pressure gas is 30~60°. In the present invention, two rows of injection holes 21 can be opened in the middle and rear sections of each mixing unit 2, and the opening direction of the injection holes 21 needs to maintain an angle of 30~60° with the flow direction of the low-pressure gas, preferably 45°, that is, the injection holes 21 on the mixing unit 2 can be processed into straight holes or inclined holes. At the same time, among the multiple injection holes 21 opened in each row of the injection parts along the flow direction of the high-pressure gas, the distance between two adjacent injection holes 21 can be the same or different, which is determined according to actual needs.

[0036] Furthermore, when the blending assembly includes a plurality of the blending units 2, a gap is provided between two adjacent blending units 2. The purpose of the gap is to leave a margin for the thermal deformation of the blending unit 2 when the high-pressure gas is introduced, so as to avoid the damage to the blending unit 2 caused by mutual compression between the two adjacent blending units 2. At the same time, the size of the gap is calculated according to the thermal deformation of the blending unit. When the gas is blended, the adjacent blending units need to be in contact with each other while avoiding mutual compression. Specifically, two adjacent blending units 2 can be welded at one end and not welded at the other end to allow them to expand freely under high heat conditions.

[0037] Furthermore, the cross section of the mixing unit 2 is a runway shape formed by arc segments and straight segments. In a specific implementation, the mixing unit 2 can be formed by full welding of an arc plate and a steel plate with a groove.

[0038] In an improved embodiment of the above-mentioned gas mixing device, see Figure 2 As shown, a plurality of guide strips 3 are provided between two adjacent layers of the mixing components and along the flow direction of the high-pressure gas. By providing the guide strips 3, the low-pressure gas channel between the two adjacent layers of the mixing components can be divided into a plurality of small channels, which can optimize the distribution of the airflow flow in the low-pressure gas channel and improve the mixing effect of the low-pressure gas in the low-pressure gas channel and the high-pressure gas ejected from the injection structure. In specific implementation, the guide strip 3 located between the mixing component and the inner wall of the main pipe can be welded to the inner wall of the main pipe at one end, and a gap is left between the other end and the mixing component. The guide strip 3 located between the two mixing components can be welded at its lower end to the mixing component below it, so that a gap is left between its top and the mixing component above it.

[0039] In an improved embodiment of the above-mentioned gas mixing device, when mixing high-pressure gas and low-pressure gas, in order to avoid displacement and vibration of the mixing structure due to airflow, affecting the gas mixing effect and causing structural damage to the mixing structure, a limiting structure for limiting the mixing structure is provided on the inner wall of the main pipe.

[0040] In an improved embodiment of the gas mixing device, the gas mixing device further comprises an end mounting plate 4, the end mounting plate 4 is located at the interface between the branch pipe and the main pipe, and the front end of the mixing structure is inserted into and passes through the mounting hole of the end mounting plate 4. Specifically, the end mounting plate 4 can be fixed to the inner wall of the positive tee pipe fitting through the mounting portion, and in order to avoid the vibration of the airflow and the influence of high and low temperatures, the end mounting plate 4 is not welded to the inner wall of the pipe, and limit baffles can be provided on both sides of the inner wall of the pipe to limit the axial movement of the end mounting plate 4. At the same time, this design allows the end mounting plate 4 to expand and contract freely due to the influence of temperature.

[0041] Preferably, in an optional embodiment not shown in the drawings, in order to increase the rigidity of the end mounting plate 4, a frame can be welded on the end mounting plate 4. At the same time, since high-pressure gas is introduced into the mixing unit 2, in order to reduce the vibration of the mixing unit 2, the mixing unit 2 is limited and fixed at the end mounting plate 4, and since the flow rate of the injection hole 21 on the mixing unit 2 is fast and the vibration is large, the mixing unit 2 is not suitable for the end mounting plate 4 and is fixed by welding. It only needs to be inserted into the mounting hole on the end mounting plate 4, and ensure that it can be in close contact with the mounting hole in the case of thermal deformation of the mixing unit 2 to prevent high-pressure gas from flowing in between.

[0042] In another improved embodiment of the above-mentioned gas mixing device, see Figure 2 As shown, the gas mixing device also includes a block 5, and a block 5 is provided between the outermost mixing component and the inner wall of the branch pipe and between two adjacent layers of the mixing components. The block 5 can prevent high-pressure gas from flowing into the low-pressure gas from between two adjacent mixing components and between the outermost mixing unit and the inner wall of the branch pipe to affect the mixing of high-pressure and low-pressure gases. In a specific implementation, one end of the block 5 contacts the end mounting plate 4, and the other end is welded to the mixing unit 2 to limit the high-pressure gas from flowing from the outside of the mixing unit 2 into the low-pressure gas channel along the gas flow direction.

[0043] In an optional embodiment, the positive three-way pipe fittings, mixing structure and hanging plate 1 of the gas mixing device of the present invention are all made of materials that can withstand the test requirements under all working conditions of the air environment simulation test. The plates, pipes and fasteners of the mixing device of the present invention are all made of 304 stainless steel, and the surface roughness Ra of all materials is not greater than 12.5. At the same time, in order to ensure the installation accuracy of the mixing unit 2, the hanging plate 1 and the end mounting plate 4 can use a high-power laser cutting machine to position and cut the mounting holes of the mixing unit 2 at the same time, so as to ensure that the radial processing deviation of the mounting holes of the mixing unit 2 on the hanging plate 1 and the end mounting plate 4 meets the installation requirements of the mixing unit 2. The injection hole 21 on the mixing unit 2 is opened by laser, and the total opening area is strictly controlled to meet the design requirements. After opening, the inner and outer surfaces of the mixing unit should be processed to ensure the cleanliness of the inner and outer surfaces of the mixing unit.

[0044] In an optional embodiment, when the present invention conducts an aerial environment simulation test, the pressure ratio and flow ratio of the high-pressure and low-pressure gases need to be within an appropriate range, so that the pressure ratio between the two is between 1.05 and 1.5, and the flow ratio is between 0.0 and 40.0. For example, when the pressure of the high-pressure gas is 140 kPa, the pressure of the low-pressure gas is 120 kPa.

[0045] The gas mixing device of the present invention can achieve the purpose of improving the mixing effect and reducing the pressure loss by arranging the mixing structure in the positive tee pipe fitting and designing the mixing structure. The gas mixing device has the following advantages:

[0046] 1. Compared with the traditional mixing principle, the mixing principle of the mixing device of the present invention is as follows: first, the low-pressure gas enters from the main pipe of the positive three-way pipe diameter and flows into the low-pressure gas channel between the mixing components. The high-pressure gas enters from the branch pipe of the positive three-way pipe diameter and flows into the high-pressure gas channel in the mixing component and is then sprayed to the low-pressure gas channel through the injection structure. The high-pressure gas and the low-pressure gas contact in the low-pressure gas channel for the first mixing; secondly, when the mixed gas in each low-pressure gas channel is output from the mixing structure, it is decelerated by pressure expansion and secondary mixing is performed to obtain the final mixed gas. The gas mixing device of the present invention not only changes the mixing mechanism of the natural flow development of the gas supply flow in the long-distance gas supply pipeline in the traditional scheme from the mixing principle, but also effectively improves the mixing effect of the high-pressure gas and the low-pressure gas through the setting of the multi-layer mixing unit.

[0047] 2. When the gas mixing device of the present invention is working, the two high-pressure and low-pressure gases enter the mixing structure through different channels, which can perform initial rectification, flow fragmentation and flow equalization on the airflow, effectively reducing the turbulence of the incoming flow. The flow field can be further uniformed when entering the main pipe after outputting the mixing structure, and the engine inlet flow field quality can meet the standard requirements of total temperature, total pressure and turbulence of ±1.0% within a short distance.

[0048] 3. Most of the traditional mixing devices mainly consider the outlet flow field of the mixed airflow, and the pipeline flow path is relatively long, resulting in a large pressure loss of the mixed airflow (about 20kPa). Compared with the traditional mixing device, the present invention designs a low-pressure gas channel for the entry of low-pressure gas. By setting a guide strip between two adjacent layers of mixing components, the mixed airflow can be rectified and the pressure loss can be reduced to 5kPa, thereby achieving the purpose of greatly reducing the pressure loss of the airflow passing through the mixing device.

[0049] 4. Compared with the structure of the traditional mixing device, the present invention designs the mixing assembly, which is formed by multiple independent mixing units, and an array of injection holes is opened on each mixing unit. If the device needs to be maintained during operation, it is only necessary to cut the mixing unit and the block spot-welded at the end mounting plate, and pull out the mixing unit for maintenance or replacement, which greatly improves the maintainability of the equipment.

[0050] Obviously, those skilled in the art should understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A gas mixing device for air environment simulation test, characterized in that: The gas mixing device comprises a straight tee pipe fitting and a mixing structure, wherein a radial hanging plate (1) is provided in the main pipe of the straight tee pipe fitting, and the end of the mixing structure is inserted from the branch pipe of the straight tee pipe fitting, passes through the hanging plate (1), and contacts the inner wall of the main pipe; The mixing structure comprises a plurality of mixing components arranged along the radial direction of the main pipe, a low-pressure gas channel is arranged between two adjacent layers of the mixing components, a high-pressure gas channel perpendicular to the low-pressure gas channel is arranged in the mixing component, and an injection structure connecting the low-pressure gas channel and the high-pressure gas channel is provided on the mixing component; the mixing component comprises at least one mixing unit (2) arranged along the radial direction of the main pipe, the high-pressure gas channel is arranged in the mixing unit (2), a middle and rear section of the mixing unit (2) located in the main pipe is provided with an injection hole array at the rear end along the low-pressure gas flow direction, and the injection hole arrays of all the mixing units (2) form the injection structure; and a plurality of guide strips (3) are provided between two adjacent layers of the mixing components and along the high-pressure gas flow direction.

2. The gas mixing device for air environment simulation test according to claim 1, characterized in that: The injection hole array comprises at least one row of injection parts distributed along the flow direction of the low-pressure gas, each row of the injection parts comprises a plurality of injection holes (21) distributed along the flow direction of the high-pressure gas, and the angle between the injection holes (21) and the flow direction of the low-pressure gas is 30-60 degrees.

3. The gas mixing device for air environment simulation test according to claim 1, characterized in that: When the blending assembly comprises a plurality of the blending units (2), a gap is provided between two adjacent blending units (2).

4. The gas mixing device for air environment simulation test according to claim 1, characterized in that: The cross section of the mixing unit (2) is in the shape of a racetrack formed by arc segments and straight line segments.

5. The gas mixing device for air environment simulation test according to claim 1, characterized in that: A limiting structure for limiting the mixing structure is provided on the inner wall of the main pipe.

6. The gas mixing device for air environment simulation test according to claim 1, characterized in that: The gas mixing device further comprises an end mounting plate (4), the end mounting plate (4) being located at the interface between the branch pipe and the main pipe, and the front end of the mixing structure being inserted into and passing through a mounting hole of the end mounting plate (4).

7. The gas mixing device for air environment simulation test according to claim 1, characterized in that: The gas mixing device further comprises a block (5), and the block (5) is provided between the outermost mixing component and the inner wall of the branch pipe and between two adjacent layers of the mixing components.

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