Gas mixing device and method for laminated electric arc heater

Abstract

The invention discloses a gas mixing device and method for a laminated electric arc heater. The device comprises a main gas collecting pipe, partition plates, electromagnetic valves, one-way valves, sound velocity nozzles, small gas collecting pipes and the like. The using method comprises the steps that gas A is introduced into the main gas collecting pipe through the electromagnetic valve and the one-way valve, and gas B and gas C are introduced into the main gas collecting pipe through the electromagnetic valve, the one-way valve and the sound velocity nozzle respectively. A partition plate is arranged in the main gas collecting pipe, and mixed gas flows into a small gas collecting pipe connected with a gas pipe of the laminated heater through a plurality of sound velocity nozzles of different sizes. According to the method, various gases can be uniformly introduced into the heater after being mixed according to any proportion, and the flow of the mixed gases and the total flow of the gases entering the heater can be accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of operation of arc heaters in aerospace aerodynamic thermal ground tests, and in particular to a gas mixing device and method for laminated arc heaters. Background Art

[0002] With the advancement of science and technology, there are more and more types of aircraft, and the tasks they perform are becoming more and more complex. Therefore, higher and more refined requirements are put forward for the aerodynamic thermal ground simulation test of aircraft. Some special tests require the use of different gas media to simulate the flight environment of the aircraft more realistically.

[0003] The laminated arc heater is an important aerodynamic thermal ground simulation test equipment and the most commonly used high enthalpy and long time test equipment. However, its complex air intake structure also puts higher requirements on the application of mixed gases. The laminated arc heater is a complex device composed of front and rear electrode groups and hundreds of laminates in the middle. Each laminate needs air intake, and the air intake volume in different parts of the heater is different, and there is a strict proportional relationship. How to evenly pass the mixed gas into the laminated heater without changing the flow ratio of each part of the heater, and accurately control the flow ratio of each mixed gas, there was no better solution before. Summary of the invention

[0004] The present invention provides a gas mixing device and method for a laminated arc heater, aiming to solve the problems in the background technology.

[0005] In a first aspect, a gas mixing device for a laminated arc heater is provided, comprising a main gas collecting pipe, a partition, a first solenoid valve, a first non-return valve, at least one gas inlet assembly and a plurality of output assemblies, wherein the output assemblies comprise a first sonic nozzle and a small gas collecting pipe; the first solenoid valve, the first non-return valve and at least one gas inlet assembly are arranged near the gas inlet end of the main gas collecting pipe; the plurality of output assemblies are arranged near the gas outlet end of the main gas collecting pipe; the plurality of gas inlet assemblies input gas on the same side of the main gas collecting pipe;

[0006] The first airflow passes through the first solenoid valve and the first one-way valve in sequence and enters the main air collecting pipe; the direction in which the first airflow enters the main air collecting pipe is relatively parallel to the axial direction of the main air collecting pipe;

[0007] The plurality of air intake components include a first air intake component, the first air intake component includes a second solenoid valve, a second one-way valve, and a second sonic nozzle; a second airflow corresponding to the first air intake component sequentially passes through the second solenoid valve, the second one-way valve, and the second sonic nozzle to enter the main air collecting pipe; a direction in which the second airflow enters the main air collecting pipe is relatively perpendicular to the axial direction of the main air collecting pipe;

[0008] The airflow in the main air collecting pipe is output through the first sonic nozzle and the small air collecting pipe in sequence; the direction of the airflow output from the main air collecting pipe is perpendicular to the axial direction of the main air collecting pipe;

[0009] The main air collecting pipe is provided with a plurality of alternately arranged partitions at the air inlet end; the partitions are perpendicular to the axial direction of the main air collecting pipe; among two adjacent alternating partitions, one partition is arranged close to a plurality of air inlet components, and the other partition is arranged away from a plurality of air inlet components; in addition, an air inlet component is correspondingly arranged between two adjacent alternating partitions.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the plurality of air intake components also include a second air intake component, the second air intake component including a third solenoid valve, a third one-way valve, and a third sonic nozzle; the third airflow corresponding to the second air intake component passes through the third solenoid valve, the third one-way valve, and the third sonic nozzle in sequence and enters the main air collecting pipe; the direction in which the third airflow enters the main air collecting pipe is relatively perpendicular to the axial direction of the main air collecting pipe.

[0011] In combination with the first aspect, in certain implementations of the first aspect, a first baffle in the main air collecting pipe is disposed close to the first solenoid valve and the first one-way valve, and is located on a side of the main air collecting pipe away from the air intake assembly; a second baffle in the main air collecting pipe is located between the first air intake assembly and the second air intake assembly, and is located on a side of the main air collecting pipe close to the air intake assembly;

[0012] The first airflow bypasses the first partition plate and mixes with the airflow output from the closest air intake assembly; the airflows on both sides of the second partition plate bypass the second partition plate and mix.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the second solenoid valve and the first solenoid valve are connected to the arc heater operation control system through a PLC to control the opening or closing thereof.

[0014] In combination with the first aspect, in certain implementations of the first aspect, a plurality of air pipes are installed on the small collecting pipe, and the other end of each air pipe is connected to a laminate of the laminate heater.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the first airflow is a main airflow; and the airflow flow rate input by any air intake component is smaller than the main airflow flow rate.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the equivalent diameter of the first sonic nozzle is 6 mm, the diameter of the second sonic nozzle is 2.2 mm, and the diameter of the third sonic nozzle is 2.5 mm.

[0017] In a second aspect, a method for using the gas mixing device as described in any one of the implementations of the first aspect is provided, comprising:

[0018] Gas B is introduced into the main gas collecting pipe through the first air intake assembly, gas C is introduced into the main gas collecting pipe through the second air intake assembly, and gas A is introduced into the main gas collecting pipe through the first solenoid valve and the first one-way valve; the mixed gas is introduced into the laminated heater through the output assembly;

[0019] During operation, the pressure in the main manifold is equal to the intake pressure of gas A;

[0020] By adjusting the pressure of gas B and gas C, the flow rates of gas B and gas C are controlled respectively, thereby controlling the ratio of gas B and gas C in the mixed gas; the flow rate of gas A is obtained by subtracting the flow rates of gas B and gas C from the total flow rate of gas entering the heater.

[0021] In combination with the second aspect, in certain implementations of the second aspect, gas B and gas C are introduced into the main gas collecting pipe 1 to 2 seconds before gas A is introduced.

[0022] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:

[0023] (1) The gas mixing device and method of the laminated arc heater of the present invention can achieve the mixing of two, three, four or more gases, and can accurately control the flow rate of each mixed gas.

[0024] (2) The gas mixing device and method of the laminated arc heater of the present invention can achieve uniform mixing of multiple gases.

[0025] (3) The gas mixing device and method of the laminated electric arc heater of the present invention can ensure that uniformly mixed gas can be introduced into each part without changing the air intake ratio of the laminated electric arc heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0027] Figure 2 for Figure 1 MM cross-sectional view.

[0028] Figure 3 for Figure 1 NN cross-sectional view. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1As shown, the present invention provides a gas mixing device for a laminated arc heater, comprising a main gas collecting pipe 10, a partition 11, a first solenoid valve 31, a first non-return valve 32, at least one gas inlet assembly 20 and a plurality of output assemblies 40, wherein the output assembly 40 comprises a first sonic nozzle 41 and a small gas collecting pipe 42. The first solenoid valve 31, the first non-return valve 32 and at least one gas inlet assembly 20 are arranged near the first end (gas inlet end) of the main gas collecting pipe 10. The plurality of output assemblies 40 are arranged near the second end (gas outlet end) of the main gas collecting pipe 10.

[0031] The first airflow passes through the first solenoid valve 31 and the first one-way valve 32 in sequence and enters the main air collecting pipe 10. The direction in which the first airflow enters the main air collecting pipe 10 can be relatively parallel to the axial direction of the main air collecting pipe 10. The first airflow corresponding to the input of the first solenoid valve 31 and the first one-way valve 32 is the main airflow. The main airflow is, for example, air. The airflow flow rate input by any air intake component 20 is less than the main airflow flow rate.

[0032] The plurality of air intake assemblies 20 include a first air intake assembly, and the first air intake assembly includes a second solenoid valve 21, a second one-way valve 22, and a second sonic nozzle 23. The second airflow corresponding to the first air intake assembly sequentially passes through the second solenoid valve 21, the second one-way valve 22, and the second sonic nozzle 23 to enter the main air collecting pipe 10. The direction in which the second airflow enters the main air collecting pipe 10 may be relatively perpendicular to the axial direction of the main air collecting pipe 10. The plurality of air intake assemblies 20 may input gas on the same side of the main air collecting pipe 10.

[0033] The airflow in the main air collecting pipe 10 is outputted by sequentially passing through the first sonic nozzle 41 and the small air collecting pipe 42. The direction in which the airflow is outputted from the main air collecting pipe 10 may be perpendicular to the axial direction of the main air collecting pipe 10.

[0034] The main air collecting pipe 10 is provided with a plurality of alternately arranged partitions 11 at the air inlet end. The partitions 11 may be perpendicular to the axial direction of the main air collecting pipe 10. In two adjacent alternate partitions 11, one partition 11 is provided close to a plurality of air inlet components 20 (e.g. Figure 2 As shown), another partition 11 is arranged away from the plurality of air intake components 20 (as shown Figure 3 In addition, an air intake assembly 20 may be disposed between two adjacent alternating partitions 11 .

[0035] In one embodiment, several air intake assemblies 20 also include a second air intake assembly, and the second air intake assembly includes a third solenoid valve, a third one-way valve, and a third sonic nozzle. The third airflow corresponding to the second air intake assembly passes through the third solenoid valve, the third one-way valve, and the third sonic nozzle in sequence to enter the main air collecting pipe 10. The direction in which the third airflow enters the main air collecting pipe 10 can be relatively perpendicular to the axial direction of the main air collecting pipe 10. The first partition in the main air collecting pipe 10 is arranged close to the first solenoid valve 31 and the first one-way valve 32, and is located on the side of the main air collecting pipe 10 away from the air intake assembly 20. The second partition in the main air collecting pipe 10 is located between the first air intake assembly and the second air intake assembly, and is located on the side of the main air collecting pipe 10 close to the air intake assembly 20. As a result, the first airflow can bypass the first partition shown in the NN section and mix with the third airflow. After the third airflow is mixed with the first airflow, it can continue to bypass the second partition shown in the MM section and mix with the second airflow.

[0036] In some embodiments, the second solenoid valve 21 and the first solenoid valve 31 are connected to the arc heater operation control system through PLC to control their opening or closing.

[0037] In some embodiments, a plurality of air pipes are installed on the small air collecting pipe 42, and the other end of each air pipe is connected to a laminate of the laminate heater.

[0038] The present invention also provides a method for using a gas mixing device for a laminated electric arc heater, and the specific steps are as follows.

[0039] (1) Gas B is introduced into the main manifold 10 through the intake assembly 20 .

[0040] (2) The gas C is introduced into the main manifold 10 through the intake assembly 20 .

[0041] (3) Gas A passes through the first solenoid valve 31 and the first check valve 32 in sequence and enters the main gas collecting pipe 10.

[0042] (4) Gas B and gas C are introduced into the main gas collecting pipe 1 to 2 seconds later, and then gas A is introduced.

[0043] The flow rates of gas B and gas C are lower than that of gas A, and the entry resistance of gas A is relatively smaller, so gas A can be introduced later than gas B and gas C.

[0044] (5) The mixed gas is passed into the laminated heater through the output assembly 40.

[0045] (6) During operation, the pressure in the main manifold 10 is equal to the intake pressure of gas A; when the size of the first sonic nozzle 41 is fixed, the total gas flow rate entering the laminated heater can be controlled by controlling the pressure in the main manifold 10.

[0046] (7) When the size of the sonic nozzle in the air intake assembly 20 is constant, by adjusting the pressure of gas B and gas C, the flow rates of gas B and gas C can be controlled respectively, thereby controlling the ratio of gas B and gas C in the mixed gas.

[0047] (8) The flow rate of gas A can be obtained by subtracting the flow rates of gas B and gas C from the total flow rate of gas entering the heater.

[0048] Example 1

[0049] This embodiment requires that the mixed gases are A air, B nitrogen, and C argon, respectively, with a total gas flow rate of 200g / s, of which the air flow rate is 100g / s, the nitrogen flow rate is 60g / s, and the argon flow rate is 40g / s. It is known that the equivalent diameter of all the first sonic nozzles 41 in the output component 40 is 6mm, the diameter of the sonic nozzle in the nitrogen intake component is 2.2mm, and the diameter of the sonic nozzle in the argon intake component is 2.5mm. In the intake component of nitrogen or argon, the diameter of the sonic nozzle can be selected first and the corresponding intake pressure can be estimated; if the intake pressure is too high, the diameter of the sonic nozzle is increased; if the intake pressure is too low, the diameter of the sonic nozzle is reduced. When the intake flow rate of gas B or gas C is large, the intake channel can be increased to reduce the required intake pressure.

[0050] According to the sonic flow method formula, when the required flow rates of gas A, gas B and gas C and the diameter of the sonic nozzle are known, the formula can be used to calculate that the required intake pressure of gas A is approximately 3.05MPa, the required intake pressure of gas B is approximately 6.9MPa, and the required intake pressure of gas C is approximately 7MPa.

[0051] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A gas mixing device for a laminated arc heater, characterized in that: The invention comprises a main gas collecting pipe (10), a partition (11), a first solenoid valve (31), a first non-return valve (32), at least one gas intake assembly (20) and a plurality of output assemblies (40), wherein the output assembly (40) comprises a first sonic nozzle (41) and a small gas collecting pipe (42); the first solenoid valve (31), the first non-return valve (32) and at least one gas intake assembly (20) are arranged near the gas intake end of the main gas collecting pipe (10); the plurality of output assemblies (40) are arranged near the gas outlet end of the main gas collecting pipe (10); and the plurality of gas intake assemblies (20) input gas on the same side of the main gas collecting pipe (10); The first airflow passes through the first solenoid valve (31) and the first one-way valve (32) in sequence and enters the main air collecting pipe (10); the direction in which the first airflow enters the main air collecting pipe (10) is relatively parallel to the axial direction of the main air collecting pipe (10); The plurality of air intake assemblies (20) include a first air intake assembly, wherein the first air intake assembly includes a second solenoid valve (21), a second one-way valve (22), and a second sonic nozzle (23); a second airflow corresponding to the first air intake assembly passes through the second solenoid valve (21), the second one-way valve (22), and the second sonic nozzle (23) in sequence and enters the main air collecting pipe (10); a direction in which the second airflow enters the main air collecting pipe (10) is relatively perpendicular to the axial direction of the main air collecting pipe (10); The airflow in the main air collecting pipe (10) is outputted by passing through the first sonic nozzle (41) and the small air collecting pipe (42) in sequence; the direction of the airflow outputted from the main air collecting pipe (10) is perpendicular to the axial direction of the main air collecting pipe (10); A main air collecting pipe (10) is provided with a plurality of alternately arranged partitions (11) at the air inlet end; the partitions (11) are perpendicular to the axial direction of the main air collecting pipe (10); among two adjacent alternate partitions (11), one partition (11) is arranged close to the plurality of air inlet assemblies (20), and the other partition (11) is arranged away from the plurality of air inlet assemblies (20); in addition, an air inlet assembly (20) is correspondingly arranged between two adjacent alternate partitions (11).

2. The gas mixing device according to claim 1, characterized in that: The plurality of air intake assemblies (20) further include a second air intake assembly, which includes a third solenoid valve, a third one-way valve, and a third sonic nozzle; a third airflow corresponding to the second air intake assembly passes through the third solenoid valve, the third one-way valve, and the third sonic nozzle in sequence and enters the main air collecting pipe (10); a direction in which the third airflow enters the main air collecting pipe (10) is relatively perpendicular to the axial direction of the main air collecting pipe (10).

3. The gas mixing device according to claim 2, characterized in that: A first partition plate in the main air collecting pipe (10) is arranged close to the first solenoid valve (31) and the first one-way valve (32), and is located on a side of the main air collecting pipe (10) away from the air intake assembly (20); a second partition plate in the main air collecting pipe (10) is located between the first air intake assembly and the second air intake assembly, and is located on a side of the main air collecting pipe (10) close to the air intake assembly (20); The first airflow bypasses the first partition plate and mixes with the airflow output from the closest air intake assembly; the airflows on both sides of the second partition plate bypass the second partition plate and mix.

4. The gas mixing device according to claim 1, characterized in that: The second solenoid valve (21) and the first solenoid valve (31) are connected to the arc heater operation control system through PLC to control their opening or closing.

5. The gas mixing device according to claim 1, characterized in that: A plurality of air pipes are installed on the small air collecting pipe (42), and the other end of each air pipe is connected to a laminate of the laminate heater.

6. The gas mixing device according to claim 1, characterized in that: The first airflow is a main airflow; the airflow rate input by any air inlet component (20) is smaller than the main airflow rate.

7. The gas mixing device according to claim 1, characterized in that: The equivalent diameter of the first sonic nozzle (41) is 6 mm, the diameter of the second sonic nozzle (23) is 2.2 mm, and the diameter of the third sonic nozzle is 2.5 mm.

8. A method for using the gas mixing device according to any one of claims 1 to 7, characterized in that: include: Gas B is introduced into the main gas collecting pipe (10) through the first gas intake assembly, gas C is introduced into the main gas collecting pipe (10) through the second gas intake assembly, and gas A is introduced into the main gas collecting pipe (10) through the first solenoid valve (31) and the first one-way valve (32); the mixed gas is introduced into the laminated heater through the output assembly (40); During operation, the pressure in the main collecting pipe (10) is equal to the intake pressure of gas A; By adjusting the pressure of gas B and gas C, the flow rates of gas B and gas C are controlled respectively, thereby controlling the ratio of gas B and gas C in the mixed gas; the flow rate of gas A is obtained by subtracting the flow rates of gas B and gas C from the total flow rate of gas entering the heater.

9. The method of use according to claim 8, characterized in that: Gas B and gas C are introduced into the main gas collecting pipe 1 to 2 seconds later, and then gas A is introduced.

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