An experimental device for testing the influence of a uniform magnetic field on a one-dimensional combustion process

Abstract

The present application relates to the experimental device for testing the influence of uniform magnetic field on one-dimensional combustion process, which comprises electromagnet symmetrical about the center plane, has cylindrical coil package containing coil group, contains cylindrical pole column in the coil package, the axis of the coil package and the pole column coincide, the similar end of the two pole columns contains circular truncated cone or cylindrical pole head, the pole head contains circular pole surface, the upper and lower pole surfaces are parallel and opposite, the upper and lower pole surfaces are separated and have a certain size of pole distance; the coil package is fixed, the pole column can move up and down along the axial direction; the burner is located in the pole head of the electromagnet, and the axis of the burner coincides with the axis of the pole head of the electromagnet, the outlet plane of the burner coincides with the above-mentioned pole surface; the upper and lower pole columns of the electromagnet contain the upper and lower gas paths for feeding fuel gas or oxidizing gas into the burner respectively; the upper gas path feeds fuel gas, and the lower gas path feeds oxidizing gas; the pole head of the electromagnet contains cooling pipeline for cooling.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magnetic field acting on flame, and particularly relates to an experimental device for testing influence of uniform magnetic field on one-dimensional combustion process. BACKGROUND

[0002] It has been found in previous researches that combustion process will be changed by magnetic field, and the appearance and temperature of flame are affected.

[0003] Since the gradient magnetic field has a large magnetic force on oxygen, oxygen tends to migrate to the direction with large magnetic field gradient under the action of the magnetic force, which is reflected in the combustion phenomenon that the oxygen enrichment or the bulk force of oxygen movement dominates.

[0004] However, the generation of magnetic field will be accompanied by magnetic field gradient, and it is difficult to exclude the influence of magnetic field gradient on flame in actual experiments, so that the experimental phenomenon of uniform magnetic field or Lorentz force acting on flame is difficult to be observed alone.

[0005] In addition, the actual combustion process usually involves three-dimensional space, and the movement of matter in the combustion process also includes three-dimensional movement direction. Since the magnetic induction line has a closed characteristic, the actual magnetic field is difficult to have a single effect on the three-dimensional space and three-dimensional movement of the combustion process.

[0006] The existing flame burner, as shown in the figure, is vertically arranged with the jet pipe 91 and the electromagnet 92, and in this device, the oxygen is subjected to the downward paramagnetic force, and the oxygen will move downward and form a convection with the flame. The momentum transfer characteristics and reaction kinetics characteristics are affected together, and cannot be studied alone. Figure 3

[0007] Therefore, there is an urgent need for a device capable of carrying out experiments on the influence of uniform magnetic field on one-dimensional combustion process. SUMMARY

[0008] The purpose of the present application is to provide a device for testing the influence of uniform magnetic field on one-dimensional combustion process, which can solve the above problems and overcome the non-uniformity of space distribution of actual magnetic field and flame, so as to realize single variable experiment of magnetic field / flame.

[0009] The application discloses an experimental device for testing the influence of uniform magnetic field on one-dimensional combustion process, which comprises two groups of electromagnets which are the same in structure and symmetrical about a central plane.

[0010] The electromagnet comprises a cylindrical wire package and a cylindrical pole column arranged in the wire package and coaxial with the wire package.

[0011] The pole column can reciprocate relative to the wire package along the axis direction.

[0012] ​At the pole column axis position, a gas path is provided through the pole column along the pole column axis direction; the gas path inlet direction is the pole column to the center plane direction; at the pole column axis front end, a burner is provided; the gas paths in the two electromagnets are different and are fuel gas and oxidizing gas respectively.

[0013] Further, the pole column is provided with a pole head near the center plane side; the gas path penetrates through the pole head, and the burner is arranged at the pole head gas outlet.

[0014] Further, the pole head front end is provided with a pole surface parallel to the center plane.

[0015] Further, the pole head is in the shape of a circular truncated cone, and the circular truncated cone bottom surface faces the pole column.

[0016] Further, the pole head is provided with a cooling pipeline.

[0017] Further, the gas path inlet end is provided with a charge loading device, which entrains charged solid or liquid particles in the fuel gas flow or oxidizing agent gas flow to make the gas charged.

[0018] Further, the gas path inlet end is provided with a plasma generating device, which excites the fuel gas flow or oxidizing agent gas flow to generate plasma to increase the jet energy.

[0019] Further, the electromagnets symmetrical about the center plane are a first electromagnet and a second electromagnet respectively;

[0020] The first electromagnet comprises a cylindrical first wire package and a cylindrical first pole column arranged in the first wire package and reciprocally movable along the wire package axis direction; the first pole column is coaxial with the wire package;

[0021] At the first pole column axis position, a first gas path is provided through the first pole column along the first pole column axis direction;

[0022] The second electromagnet comprises a second wire package, a second pole column and a second gas path;

[0023] The first gas path introduces fuel gas along the first pole column to the center plane direction; the second gas path introduces oxidizing gas along the second pole column to the center plane direction.

[0024] Further, the first pole column and the second pole column are both provided with a burner;

[0025] The first pole column top end is provided with a first pole head; the first pole head front end is provided with a first pole surface parallel to the center plane;

[0026] The second pole post is provided with a second pole head at its top; the front end of the second pole head is provided with a second pole surface parallel to the central plane;

[0027] Both the first and second electrode heads are equipped with cooling pipes.

[0028] The beneficial effects of this invention are:

[0029] 1. This invention, based on a one-dimensional counteracting flame, utilizes a specially constructed electromagnet and a rationally arranged burner to design a simple and practical device for experimenting with the influence of a uniform magnetic field on a one-dimensional combustion process. The electromagnet provides a circular uniform magnetic field on a plane of symmetry, with the center of this field located on the central axis of the device. The strength of the uniform magnetic field is adjustable based on the magnitude of the electromagnet's power supply current to meet experimental requirements. By adjusting the amounts of oxidizing gas and fuel gas, the flame surface is positioned on the plane of symmetry of the electromagnet, thus coinciding with the region of the uniform magnetic field. A counteracting flame is formed on the plane of symmetry of the electromagnet, exhibiting uniform combustion. This can be approximated as a one-dimensional diffusing flame along the axial direction of the electromagnet, with the material within the flame moving radially outward, perpendicular to the direction of the magnetic field.

[0030] 2. This invention is applicable to precise experiments on the effects of uniform magnetic fields on combustion reaction rates, intermediate free radical products, etc., eliminating other interfering factors; the experimental results of this invention are a one-dimensional model, which is easy to mathematically model and realize theoretical calculation and prediction.

[0031] 3. It is equipped with a charge load device and a plasma generator. The charge load device charges the gas by entraining charged solid or liquid particles into the fuel gas flow or oxidant gas flow, so as to conduct experimental research on the effect of Lorentz force on the combustion process under a uniform magnetic field. The plasma generator generates plasma by exciting the fuel gas flow or oxidant gas flow, thereby increasing the jet energy, so as to conduct experimental research on the effect of the plasma under the Lorentz force on the combustion process under a uniform magnetic field. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the usage state of Embodiment 2 of the present invention;

[0034] Figure 3 This is a schematic diagram of an existing flame burner. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1As shown, the experimental setup for testing the effect of a uniform magnetic field on a one-dimensional combustion process includes electromagnets symmetrical about the central plane 5, namely the first electromagnet 1 and the second electromagnet 2.

[0036] The first electromagnet 1 includes a cylindrical first coil 11 and a cylindrical first pole post 12 disposed inside the first coil 11 and capable of reciprocating along the axial direction of the coil 11; the first pole post 12 is coaxial with the coil 11.

[0037] At the axial center of the first pole post 12, along the axial direction of the first pole post 12, there is a first air passage 31 that passes through the first pole post 12;

[0038] The second electromagnet 2 includes a second coil 21, a second pole piece 22, and a second air passage 32;

[0039] The first gas passage 31 introduces fuel gas along the first pole post 12 toward the central plane 5; the second gas passage 32 introduces oxidizing gas along the second pole post 22 toward the central plane 5.

[0040] Both the first pole post 12 and the second pole post 22 are equipped with burners 80;

[0041] The first pole post 12 is provided with a first pole head 13 at its top end; the first pole head 13 is provided with a first pole surface 14 parallel to the central plane 5 at its front end.

[0042] The top of the second pole post 22 is provided with a second pole head 23; the front end of the second pole head 23 is provided with a second pole surface 24 parallel to the central plane 5;

[0043] Cooling pipes 4 are provided inside both the first electrode head 13 and the second electrode head 23.

[0044] Cooling pipe 4 is arranged circumferentially along the electrode head plane to absorb additional heat from combustion and protect the electromagnet. Cooling pipe 4 can be water-cooled.

[0045] Among them, the pole head includes frustum-shaped or cylindrical pole heads. The cylindrical pole head has a larger pole surface area, which can provide a larger volume of uniform magnetic field, but the magnetic field strength is relatively weak; the frustum-shaped pole head has a smaller pole surface area, but it provides a higher magnetic field strength.

[0046] The equivalence ratio of fuel to oxidant is in the range of 0.6-11 to ensure more complete combustion of the fuel.

[0047] Example 1 - Experiment on the Influence of Uniform Magnetic Field on the One-Dimensional Combustion Process of Premixed Fuel

[0048] like Figure 1 The diagram shows an experimental setup for the influence of a magnetic field on the one-dimensional combustion process of premixed fuel. It includes a first electromagnet 1 and a second electromagnet 2, which are identical in structure and symmetrical about the central plane 5.

[0049] The first coil 11 that makes up the first electromagnet is cylindrical, the first pole post 12 is cylindrical with an outer diameter of 130mm, the first pole head 13 is frustum shaped, and the first pole surface 14 is circular with a diameter of 50mm.

[0050] The distance between the upper and lower poles is 30mm.

[0051] A 20A current in the same direction is passed through the first coil 11 of the first electromagnet 1 to generate a uniform magnetic field in the region between the first pole face 14 and the second pole face 24, with the magnetic field lines 10 pointing from one pole face to the other.

[0052] The circular nozzle jet burner 80 has a jet diameter of 3mm. The fuel methane air premixed gas passes through the first gas passage 31 along the upward airflow direction 81, and the fuel methane air premixed gas passes through the second gas passage 32 along the downward airflow direction 82. The inner diameter of the upper and lower gas passages is 4mm.

[0053] Fuel methane-air premixed gas is injected into the combustion reaction zone through burner 80, ignited, and the flow rate of the premixed gas is adjusted so that the one-dimensional flame surface 5 is located on the electromagnet's plane of symmetry. At this time, the combustion reactants move radially along direction 9 within the one-dimensional flame surface 5. The direction of motion of the combustion reactants 9 is perpendicular to the direction of the magnetic field lines 10.

[0054] Cooling water is introduced into the cooling pipeline 4 to prevent polar surface ablation.

[0055] The four characteristics of a flame are momentum transfer, mass transfer, heat transfer, and reaction kinetics. The symmetrical structure in Embodiment 1 of this invention can eliminate the influence on momentum transfer, while the premixed flame can eliminate the influence on mass transfer. Heat transfer is negligible, so the influence of the magnetic field on reaction kinetics can be studied independently. Therefore, this device can realize experiments on the influence of a uniform magnetic field on a one-dimensional combustion process.

[0056] Example 2 - Experiment on the Influence of Lorentz Force in a Uniform Magnetic Field on a One-Dimensional Combustion Process

[0057] like Figure 2 The diagram shows an experimental setup for the influence of a magnetic field on a one-dimensional combustion process. It includes a first electromagnet 1 and a second electromagnet 2, which are identical in structure and symmetrical about the central plane 5.

[0058] The first coil 11 that makes up the first electromagnet is cylindrical, the first pole post 12 is cylindrical with an outer diameter of 130mm, the first pole head 13 is frustum shaped, and the first pole surface 14 is circular with a diameter of 50mm.

[0059] The distance between the upper and lower poles is 30mm.

[0060] A 20A current in the same direction is passed through the first coil 11 of the first electromagnet 1 to generate a uniform magnetic field in the region between the first pole face 14 and the second pole face 24, with the magnetic field lines 10 pointing from one pole face to the other.

[0061] The circular nozzle jet burner 80 has a jet diameter of 3mm. The fuel methane air premixed gas passes through the first gas passage 31 along the upward airflow direction 81, and the fuel methane air premixed gas passes through the second gas passage 32 along the downward airflow direction 82. The inner diameter of the upper and lower gas passages is 4mm.

[0062] A charge-load device 6 is installed in the second gas path 32 so that the oxygen gas flow carries a small amount of positively or negatively charged droplets into the combustion reaction zone.

[0063] Ignite and adjust the flow rates of methane and oxygen so that the one-dimensional flame surface 5 is located on the plane of symmetry of the electromagnet. At this time, the combustion reactants move radially along direction 9 within the one-dimensional flame surface 5. The direction of motion of the combustion reactants 9 is perpendicular to the direction of the magnetic field lines 10.

[0064] The charged reactant is subjected to a Lorentz force perpendicular to directions 9 and 10 and satisfying the left-hand rule, causing a deflection of its motion direction within the one-dimensional flame surface 5.

[0065] Cooling water is introduced into the cooling pipeline 4 to prevent polar surface ablation.

[0066] At this point, the device can be used to conduct experiments on the influence of the Lorentz force of a uniform magnetic field on a one-dimensional combustion process.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental device for testing the influence of a uniform magnetic field on a one-dimensional combustion process, characterized in that: The electromagnet comprises two groups of electromagnets which are symmetrical about a center plane (5); The electromagnet comprises a cylindrical coil and a cylindrical pole column arranged in the coil coaxially; The pole column reciprocates along the axis direction relative to the coil; A gas passage is arranged through the pole column along the axis direction of the pole column at the center of the pole column; the gas passage is arranged to pass fuel gas along the direction of the pole column to the center plane (5); a burner (80) is arranged at the front end of the pole column; the gas passages of the two electromagnets are different and pass fuel gas and oxidizing gas respectively; The electromagnets symmetrical about the center plane (5) are a first electromagnet (1) and a second electromagnet (2); The first electromagnet (1) comprises a cylindrical first coil (11) and a cylindrical first pole column (12) arranged in the first coil (11) and reciprocating along the axis direction of the first coil (11); the first pole column (12) is coaxial with the first coil (11); A first gas passage (31) is arranged through the first pole column (12) along the axis direction of the first pole column (12) at the center of the first pole column (12); The second electromagnet (2) comprises a second coil (21), a second pole column (22) and a second gas passage (32); The first gas passage (31) passes fuel gas along the first pole column (12) to the center plane (5); the second gas passage (32) passes oxidizing gas along the second pole column (22) to the center plane (5); The first pole column (12) and the second pole column (22) are both provided with a burner (80); A first pole head (13) is arranged at the top end of the first pole column (12); a first pole face (14) parallel to the center plane (5) is arranged at the front end of the first pole head (13); A second pole head (23) is arranged at the top end of the second pole column (22); a second pole face (24) parallel to the center plane (5) is arranged at the front end of the second pole head (23); A cooling pipeline (4) is arranged in the first pole head (13) and the second pole head (23).

2. The experimental setup for testing the influence of a uniform magnetic field on a one-dimensional combustion process according to claim 1, characterized in that The pole head is arranged near the center plane (5); the gas passage passes through the pole head; and the burner (80) is arranged at the gas outlet of the pole head.

3. The experimental setup for testing the influence of a uniform magnetic field on a one-dimensional combustion process according to claim 2, characterized in that The pole head is provided with a pole face parallel to the center plane (5).

4. The experimental apparatus for testing the effect of a uniform magnetic field on a one-dimensional combustion process according to claim 2, characterized in that: The pole head is in the shape of a circular truncated cone with the bottom surface of the circular truncated cone facing the pole column.

5. The experimental apparatus for testing the effect of a uniform magnetic field on a one-dimensional combustion process according to claim 2, characterized in that: A cooling pipeline (4) is arranged in the pole head.

6. The experimental apparatus of claim 1, wherein: A charge loading device (6) is arranged at the gas inlet end of the gas passage; the charge loading device (6) entrains charged solid or liquid particles in the fuel gas flow or the oxidizing agent gas flow to charge the gas.

7. The experimental setup for testing the influence of a uniform magnetic field on a one-dimensional combustion process according to claim 6, characterized in that A plasma generating device is arranged at the gas inlet end of the gas passage; the plasma generating device excites the fuel gas flow or the oxidizing agent gas flow to generate plasma to increase the jet energy.

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