An acoustic wave probe device for a flame

Abstract

This invention discloses an acoustic probe device for flames. The device includes a diffused flame burner, a signal generator, a power amplifier, a loudspeaker, an acoustic probe for conducting sound waves, and a three-dimensional displacement stage. The burner provides a stable laminar flame, and the signal generator provides an acoustic signal. This signal is amplified by the power amplifier and transmitted to the loudspeaker, which then emits corresponding sound waves. These sound waves are conducted into the flame through the acoustic probe. The loudspeaker is fixed on the three-dimensional displacement stage, and the position of the acoustic probe within the flame can be changed by adjusting the stage. The flame morphology after acoustic wave application is significantly different from that without acoustic wave application. This invention allows for the study of the effects of sound waves on different regions of the flame within a small range.

Description

Technical Field

[0001] This invention belongs to the field of invasive acoustic probe devices, and specifically relates to an acoustic probe device for flames. Background Technology

[0002] In recent years, acoustic agglomeration technology has been widely used to improve dust removal efficiency. Applying high-intensity sound waves to aerosols can cause the particles within them to collide and agglomerate, resulting in a decrease in the total amount of particles, an increase in the average particle size, and a reduction in the particle concentration.

[0003] Applying a forced sound field to a flame alters its morphology, structure, chemical reaction rate, and the diffusion rate of fuel and oxidizer. During combustion, inhalable particulate matter produced by incomplete combustion is called soot. Soot growth involves both physical polymerization and chemical surface growth. The control of soot particles within the flame has received increasing attention due to advancements in scientific research and diagnostic techniques. Since soot maturity varies at different flame heights, this device can be used to study the effects of micro-range sound waves on soot formation and flame characteristics in different regions of the flame.

[0004] The fabricated acoustic probe is extremely small. Without applying acoustic waves, the probe can be inserted into the flame without significantly affecting its morphology. However, when acoustic waves are applied, the flame morphology changes noticeably. This device can be used to study the direct action of microscopic acoustic waves on flames. Summary of the Invention

[0005] The purpose of this invention is to provide a sound wave probe device for flames, which is an invasive sound wave probe that directly acts on the flame.

[0006] A sound wave probe device for a flame, comprising three parts: a sound wave generator, a measuring device, and a diffused flame burner.

[0007] The device is specifically as follows:

[0008] Under the premise of ensuring normal combustion of the diffused flame burner, the signal generator emits a stable acoustic signal with adjustable waveform and frequency.

[0009] The signal is then transmitted to a power amplifier, and the sound pressure level of the sound wave can be changed by adjusting the power level.

[0010] The sound waves emitted by the loudspeaker will be directly transmitted into the flame through the sound wave probe. By adjusting the three-dimensional displacement stage, the position of the sound wave probe in the flame can be changed, so as to achieve the purpose of having a local effect on the flame by the sound waves in a small range.

[0011] Diffusion flame burners ensure the generation of stable laminar diffusion flames;

[0012] Finally, when measuring sound pressure with a sound level meter, ensure that the flame is extinguished to eliminate interference between the flame and the sound waves.

[0013] Compared with the prior art, the present invention has the following advantages: (1) The sound wave generating device and the burner are easy to disassemble and install, and the burner shape can be varied to meet the acoustic conditions for the flame; (2) The sound wave probe is extremely small. Without applying sound waves, the sound wave probe can be inserted into the flame without changing the flame shape, and the effect of invasive sound waves on the flame can be realized; (3) The position of the sound wave probe in the flame can be adjusted, and the effect of small-range sound waves on different areas of the flame can be realized.

[0014] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is the main view of the system of the present invention.

[0016] Figure 2 This is a top view of the system of the present invention.

[0017] Figure 3 This is a front view of the acoustic probe of the present invention.

[0018] Figure 4 This is a top view of the acoustic probe of the present invention.

[0019] Figure 5 This is a diagram showing the effect of the device of the present invention on the anti-diffusion flame at a sound wave frequency of 3000Hz.

[0020] Figure 6 The image shows the effect of a sound probe applied to different flame heights when a 3000Hz, 115dB sound wave is applied. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] This invention provides an acoustic probe device for flames, comprising an acoustic wave generator, a measuring device, and a diffused flame burner. (Combined with...) Figure 1 , Figure 2 , Figure 3 , Figure 4 The following explanation is provided.

[0023] An acoustic probe device for flames, comprising:

[0024] Signal generator 1 provides sound wave signals;

[0025] Signal generator 1 is connected to power amplifier 2 via wire 8. Power amplifier 2 is connected to speaker 4 fixed on three-dimensional displacement stage 3 via wire 8. Speaker 4 is connected to acoustic probe 5.

[0026] The acoustic probe 5 is placed horizontally and perpendicular to the central axis of the diffuse flame burner 6, with its outlet located above the diffuse flame burner 6.

[0027] The sound level meter 7 is placed horizontally and is set up in accordance with the sound wave probe.

[0028] Signal generator 1 adjusts the waveform and frequency of the sound wave signal.

[0029] The power amplifier 2 changes the sound pressure level of the sound waves emitted by the speaker 4 by adjusting the power level, and the sound pressure level is measured by the sound level meter 7.

[0030] When measuring sound pressure level, ensure there is no external sound source interference and that the flame is extinguished.

[0031] The three-dimensional displacement stage 3 is completely fixed to the speaker 4. The position of the acoustic probe 5 can be changed by adjusting the three-dimensional displacement stage.

[0032] The throat diameter of speaker 4 is 34mm.

[0033] The acoustic probe 5 is a conduit divided into three sections: the first section is a cylindrical conduit with an inner diameter of 34mm, an outer diameter of 36mm, and a length of 50mm, which is connected to the speaker throat by a thread; the second section is a tapered conduit with an inner diameter of 34mm at the larger end, an inner diameter of 1mm at the smaller end, a length of 100mm, and a wall thickness of 2mm; the third section is a cylindrical thin tube with an inner diameter of 1mm, an outer diameter of 1.5mm, and a length of 50mm.

[0034] The acoustic probe 5 is made of corundum refractory material.

[0035] The acoustic probe 5 is positioned horizontally and perpendicular to the central axis of the burner, with its outlet located above the diffuser flame burner 6.

[0036] The signal generator 1, power amplifier 2, and speaker 4 are connected sequentially by wire 8.

[0037] In operation, the signal generator 1 emits a stable wave signal with controllable frequency and waveform. This signal is amplified by the power amplifier 2 and transmitted to the speaker 4, emitting a stable sound wave. The sound pressure level is controlled by adjusting the power amplifier's amplification power. The sound wave propagates directly to the flame area after passing through the sound probe 5, which is positioned directly above the burner, ensuring a horizontal position and perpendicular to the burner's axis. The sound probe 5 focuses the wide-range sound waves emitted by the speaker into a very small area; its tapered duct also serves to converge the sound waves. The signal generator 1, power amplifier 2, and speaker 4 are connected by wire 8. The diffused flame burner 6 provides a stable laminar diffused flame. The position of the sound probe 5 within the flame can be changed by adjusting the displacement stage 3, achieving the effect of a small range of sound waves acting on different areas of the flame. When measuring sound pressure, the sound level meter 7 should ensure the flame is extinguished to avoid interference between the flame and the sound waves.

[0038] like Figure 5 This is a diagram showing the effect of an acoustic probe on a counter-diffusion flame at an acoustic frequency of 3000Hz. Figure 6 The image shows the effect of an acoustic probe applied to different flame heights when a 3000Hz, 115dB sound wave is generated. As can be seen from the image, this device can apply a small-area sound field to the flame. By changing the acoustic parameters and the position of the acoustic probe within the flame, the flame morphology is significantly altered. Therefore, this device can be used to conduct research on the effect of small-area sound fields under different acoustic parameters on local flame disturbances.

Claims

1. An acoustic wave probe device for a flame, characterized by include: A signal generator (1) provides a sound wave signal; the signal generator (1) is connected to a power amplifier (2) via a wire (8), the power amplifier (2) is connected to a loudspeaker (4) fixed on a three-dimensional displacement stage (3) via a wire (8), and the loudspeaker (4) is connected to a sound wave probe (5); the sound wave probe (5) is a three-section conduit, including: the first section, a cylindrical conduit with an inner diameter of 34mm, an outer diameter of 36mm, and a length of 50mm, for threaded connection with the throat of the loudspeaker (4); the second section, a tapered conduit with an inner diameter of 34mm at the large end, an inner diameter of 1mm at the small end, a length of 100mm, and a wall thickness of 2mm; the third section, a cylindrical thin tube with an inner diameter of 1mm, an outer diameter of 1.5mm, and a length of 50mm; The acoustic probe (5) is placed horizontally and perpendicular to the central axis of the diffuse flame burner (6), with its end outlet located above the diffuse flame burner (6); the sound level meter (7) is placed horizontally and is set corresponding to the end outlet of the acoustic probe (5) for measuring the sound pressure level.

2. The apparatus of claim 1, wherein, The signal generator (1) is used to adjust the waveform and frequency of the acoustic signal.

3. The apparatus according to claim 1, characterized in that, The power amplifier (2) changes the sound pressure level of the sound waves emitted by the loudspeaker (4) by adjusting the power, and the sound pressure level is measured by the sound level meter (7).

4. The apparatus of claim 1, wherein, When using the sound level meter (7) to measure the sound pressure level, it should be ensured that there is no external sound source interference and that the flame is extinguished.

5. The apparatus of claim 1, wherein, The three-dimensional displacement stage (3) is completely fixed to the speaker (4), and the three-dimensional spatial position of the end of the acoustic probe (5) in the flame can be changed by adjusting the three-dimensional displacement stage (3).

6. The apparatus of claim 1, wherein, The throat diameter of the loudspeaker (4) is 34 mm.

7. The apparatus according to claim 1, characterized in that, The acoustic probe (5) is made of corundum refractory material.

8. The apparatus of claim 1, wherein, The signal generator (1), power amplifier (2), and loudspeaker (4) are connected in sequence by wires (8).

9. A test method using the acoustic wave probe device according to any one of claims 1 to 8, characterized by, The process includes the following steps: under the premise that the diffuse flame burner (6) is burning normally, a stable sound wave signal with adjustable waveform and frequency is emitted by the signal generator (1); the sound wave signal is transmitted to the power amplifier (2) for amplification, and the sound pressure of the sound wave is changed by adjusting the power of the power amplifier; the sound wave emitted by the loudspeaker (4) is conducted through the sound wave probe (5) and directly acts on a small area in the flame; the three-dimensional spatial position of the end of the sound wave probe (5) in the flame is changed by adjusting the three-dimensional displacement stage (3) to achieve precise acoustic disturbance of different local areas of the flame; wherein, the diffuse flame burner (6) is used to generate a stable laminar diffuse flame; when using the sound level meter (7) to measure the sound pressure level, it is ensured that the flame is extinguished to eliminate the mutual interference between the flame and the sound wave.

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