An experimental device for detecting the effect of plasma discharge on flame

Abstract

The present invention relates to an experimental device for detecting the effect of plasma discharge on flames. The device comprises: a semi-enclosed box, a burner, a pair of electrodes, a high-voltage power supply, a grounding device, and a digital oscilloscope. The semi-enclosed box is provided with an air inlet and an air outlet, the air inlet being connected to a source of discharge working gas, and the air outlet being open to the atmosphere. The burner ejects flame vertically upward, and the pair of electrodes are positioned horizontally above the burner ejection port and are movable up and down along the direction of the burner ejection. One of the pair of electrodes is electrically connected to the high-voltage power supply, and the other is electrically connected to the grounding device. The digital oscilloscope is used to measure the voltage and current parameters applied by the high-voltage power supply. The device is simple in design and easy to disassemble and install, enabling observability of flame changes under the action of plasma in different flame regions while ensuring experimental safety.

Description

Technical Field

[0001] The invention belongs to the field of experimental devices, and in particular relates to an experimental device for detecting the effect of plasma discharge on flame. Background Art

[0002] Non-equilibrium plasma combustion enhancement technology utilizes the collision of generated high-energy electrons with neutral molecules, causing molecular dissociation and excitation, generating a large number of active particles that accelerate combustion, thereby reducing ignition time, accelerating combustion speed, lowering combustion limits, and improving combustion efficiency. In the study of the formation and control of inhalable particulate matter from combustion sources during combustion, the control of particulate matter within the flame has received greater attention with the development of scientific research and diagnostic technology. The device provided by the present invention can be used to study the effects of non-equilibrium plasma directly acting on different regions of a flame on flame generation characteristics. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides an experimental device for detecting the effect of plasma discharge on flame. The device is simple in design and easy to disassemble and install, which realizes the observability of flame changes under the action of plasma in different flame areas and ensures the safety of the experiment.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The present invention provides an experimental device for detecting the effect of plasma discharge on flames. The device comprises: a semi-enclosed box, a burner, a pair of electrodes, a high-voltage power supply, a grounding device, and a digital oscilloscope. The semi-enclosed box is provided with an air inlet and an air outlet, the air inlet is connected to a discharge working gas source, and the air outlet is connected to the atmosphere. The burner sprays flames vertically upward, the pair of electrodes are located above the burner spray port and are horizontally arranged, and the pair of electrodes can move up and down along the burner spray direction. One of the pair of electrodes is electrically connected to the high-voltage power supply, and the other is electrically connected to the grounding device. The digital oscilloscope is used to measure voltage and current parameters applied by the high-voltage power supply.

[0006] Preferably, the air inlets are evenly distributed around the semi-enclosed box.

[0007] Preferably, the burner is a quartz slot burner with a rectangular outlet cross-section.

[0008] Preferably, the air inlet end of the burner is connected to the air inlet of the elbow connected to the combustible gas source through a joint.

[0009] Preferably, the electrode is composed of a quartz tube and a metal rod, one of the two metal rods is electrically connected to the high-voltage power supply, and the other is electrically connected to the grounding device.

[0010] Preferably, the device further includes a high-voltage probe and a current coil, one of the two metal rods is electrically connected to the high-voltage probe, and the other is electrically connected to the current coil, and both the high-voltage probe and the current coil are electrically connected to the digital oscilloscope.

[0011] Preferably, one end of the metal rod is sleeved in the quartz tube, and the other end is exposed to the outside for electrical connection.

[0012] Preferably, the air outlet is located at the top of the semi-enclosed box.

[0013] Preferably, the pair of electrodes are placed in parallel and staggered.

[0014] Preferably, a burner air inlet pipe through-hole and a wire through-hole for connecting electrodes are provided on the side of the semi-enclosed box.

[0015] Compared with the prior art, the present invention has the following significant advantages:

[0016] 1. Under the premise of ensuring the normal circulation and discharge of combustion gases, the present invention continuously and stably provides a discharge working gas (such as argon) environment for the semi-enclosed box. The pulsed high-voltage power supply is connected to the electrodes to provide a kilovolt high voltage in a very short time, so that the gas between the parallel and staggered quartz tube-metal rod electrodes is broken down, generating a small area of plasma discharge, which contains a large number of active particles. The slit burner can produce a thin flame that meets the discharge gap conditions. The electrode is placed perpendicular to the burner outlet and can move up and down along the flame axis to achieve the purpose of controlling the flame changes under the direct action of the plasma in different flame areas.

[0017] 2. The burner of the present invention is simple in design and easy to disassemble and install, with a variety of materials and shapes to choose from, which can meet the plasma action under different conditions; the electrode placement and discharge range are small, which realizes the observability of the flame changes under the plasma action in different flame areas; the semi-enclosed box design can provide a specific discharge atmosphere, isolate the interference of the external environment, and at the same time ensure the normal circulation of gas after combustion, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic front view of an experimental device provided by the present invention for detecting the effect of plasma discharge on flame.

[0019] Figure 2 A schematic top view of an experimental device provided by the present invention for detecting the effect of plasma discharge on flame.

[0020] Figure 3 This is the main view of the semi-enclosed box.

[0021] Figure 4This is a top view of the semi-enclosed box. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0024] Combine Figure 1-4The experimental device provided by the present invention for detecting the effect of plasma discharge on flames includes: a semi-enclosed box 1, a burner 6, a pair of electrodes 8, a high-voltage power supply 11, a grounding device 4, and a digital oscilloscope 12. The semi-enclosed box 1 is provided with an air inlet 5 and an air outlet 14. The air inlet 5 is connected to a source of discharge working gas (such as argon), and the air outlet 14 is open to the atmosphere. The burner 6 sprays flames vertically upward. The pair of electrodes 8 are located above the burner 6 spray port and are arranged horizontally. The pair of electrodes 8 can move up and down along the direction of the burner 6 spray. One of the pair of electrodes 8 is electrically connected to the high-voltage power supply 11, and the other is electrically connected to the grounding device 4. The digital oscilloscope 12 is used to measure the voltage and current parameters applied by the high-voltage power supply 11. The air inlets 5 are evenly distributed around the semi-enclosed box 1. There are 12 air inlets 5. The discharge working gas is uniformly and continuously introduced through the air inlets 5 to provide a specific atmosphere for electrode discharge. The burner 6 is a quartz slit burner with a rectangular outlet cross-section, and the rectangular outlet cross-section has a size of 4*0.4mm. The air inlet end of the burner 6 is connected to the elbow air inlet 7 connected to the combustible gas source through a connector 13. The material of the burner 6 is quartz. The electrode 8 is composed of a quartz tube 2 and a metal rod 9. One of the two metal rods 9 is electrically connected to the high-voltage power supply 11, and the other is electrically connected to the grounding device 4. The device also includes a high-voltage probe 10 and a current coil 3. One of the two metal rods 9 is electrically connected to the high-voltage probe 10, and the other is electrically connected to the current coil 3. The high-voltage probe 10 and the current coil 3 are both electrically connected to the digital oscilloscope 12. The high-voltage end voltage is measured by the high-voltage probe 10, and the total discharge current is measured by the current coil 3. The digital oscilloscope 12 displays the voltage and current values in real time. One end of the metal rod 9 is sheathed in the quartz tube 2, and the other end is exposed to the outside for electrical connection. The air outlet 14 is located at the top of the semi-enclosed box 1, allowing the gas after combustion to flow smoothly to the external environment to ensure safety. The pair of electrodes 8 are placed in parallel and staggered. The side of the semi-enclosed box 1 is provided with a burner air inlet pipe through-hole 15 and a wire through-hole 16 for connecting the electrodes. During the experiment, after the flame is ignited at the burner 6 outlet and the appropriate working conditions are adjusted to be stable, the discharge atmosphere gas is introduced into the semi-enclosed box 1 through the air inlet 5 for a period of time. After ensuring that the digital oscilloscope 12 and other electrical devices are safely connected and tested, the high-voltage power supply 11 is turned on, the digital oscilloscope 12 is observed and the appropriate discharge parameters are adjusted. The electrode 8 can move up and down along the burner injection direction to discharge at different positions of the flame to observe the effect of plasma on the flame and its products.

[0025] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An experimental device for detecting the effect of plasma discharge on flame, characterized in that: The device comprises: a semi-enclosed box (1), a burner (6), a pair of electrodes (8), a high-voltage power supply (11), a grounding device (4), and a digital oscilloscope (12); the semi-enclosed box (1) is provided with an air inlet (5) and an air outlet (14); the air inlet (5) is connected to a discharge working gas source, and the air outlet (14) is connected to the atmosphere; the burner (6) sprays flame vertically upward, the pair of electrodes (8) are located above the burner (6) spray port and are arranged horizontally, and the pair of electrodes (8) can move up and down along the spray direction of the burner (6); one of the pair of electrodes (8) is electrically connected to the high-voltage power supply (11), and the other is electrically connected to the grounding device (4); the digital oscilloscope (12) is used to measure the voltage and current parameters applied by the high-voltage power supply (11); The air inlets (5) are evenly distributed around the semi-enclosed box (1); The electrode (8) is composed of a quartz tube (2) and a metal rod (9), one of the two metal rods (9) is electrically connected to the high-voltage power supply (11), and the other is electrically connected to the grounding device (4); The device further comprises a high-voltage probe (10) and a current coil (3), one of the two metal rods (9) is electrically connected to the high-voltage probe (10), the other is electrically connected to the current coil (3), and both the high-voltage probe (10) and the current coil (3) are electrically connected to the digital oscilloscope (12); One end of the metal rod (9) is sleeved in the quartz tube (2), and the other end is exposed to the outside for electrical connection. The air outlet (14) is located at the top of the semi-enclosed box (1).

2. The device according to claim 1, characterized in that: The burner (6) is a quartz slit burner with a rectangular outlet cross-section.

3. The device according to claim 1, characterized in that: The air inlet end of the burner (6) is connected to the elbow air inlet (7) connected to the combustible gas source via a joint (13).

4. The device according to claim 1, characterized in that: The pair of electrodes (8) are placed in parallel and staggered manner.

5. The device according to claim 1, characterized in that: The side of the semi-enclosed box (1) is provided with a burner air inlet pipe through-hole (15) and a wire through-hole (16) for connecting electrodes.

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