An experimental device and method for realizing heat transfer tube vibration based on external sound field

Abstract

The present invention discloses an experimental device for realizing heat transfer tube vibration based on an external sound field, comprising a heat transfer tube vibration experimental section device, a heat transfer tube installation and fixing device, an external sound signal device, a vibration signal monitoring device, and a heat transfer tube to be tested, wherein the heat transfer tube installation and fixing device is located inside the heat transfer tube vibration experimental section device, the heat transfer tube to be tested is installed in the heat transfer tube installation and fixing device, the heat transfer tube to be tested is slidably connected to the heat transfer tube installation and fixing device through a movable slider, the external sound signal device is installed on both sides of the heat transfer tube vibration experimental section device, and the vibration signal monitoring device is pasted and arranged on the outer wall surface of the heat transfer tube to be tested. The present invention adopts the above-mentioned experimental device and method for realizing heat transfer tube vibration based on an external sound field, and provides an experimental device and an experimental method to explore whether the huge noise generated by acoustic resonance or gas flow will cause vibration damage of the heat transfer tube or couple with other vibration mechanisms to aggravate the vibration of the heat transfer tube and accelerate its damage.

Description

Technical Field

[0001] The invention relates to the technical field of heat transfer tube vibration experiments, and in particular to an experimental device and method for realizing heat transfer tube vibration based on an external sound field. Background Art

[0002] Shell and tube heat exchangers are important heat exchange equipment in industrial production systems. Due to their simple structure and mature technology, they are widely used in various fields such as chemical industry, nuclear power, metallurgy, and pharmaceuticals. The large number of heat transfer tubes contained in the heat exchanger are the main components for heat exchange, and their safety status directly affects the performance and life of the heat exchanger. Vibration caused by the fluid is an important factor leading to the failure of the heat transfer tube. This phenomenon is usually attributed to four mechanisms: turbulent buffeting, vortex shedding, fluid elastic instability, and acoustic resonance. Acoustic resonance occurs particularly in heat exchangers with gas as the shell side medium, and with the increasing trend of chemical equipment towards large-scale development, the possibility of acoustic resonance in heat exchangers with gas as the shell side medium is greatly increased. When acoustic resonance occurs, a large sound pressure will be generated, carrying huge energy that may cause structural damage to the heat transfer tube.

[0003] Currently, there is little research on the damage of heat transfer tubes caused by sound. Therefore, the present invention studies an experimental device and an experimental method for realizing the vibration of heat transfer tubes based on an external sound field. Summary of the invention

[0004] The purpose of the present invention is to provide an experimental device and method for realizing the vibration of a heat transfer tube based on an external sound field, so as to provide an experimental device and an experimental method for exploring whether the huge noise generated by acoustic resonance or gas flow will cause vibration damage to the heat transfer tube or couple with other vibration mechanisms to intensify the vibration of the heat transfer tube and accelerate its damage.

[0005] To achieve the above-mentioned purpose, the present invention provides an experimental device for realizing heat transfer tube vibration based on an external sound field, comprising a heat transfer tube vibration experimental section device, a heat transfer tube installation and fixing device, an external sound signal device, a vibration signal monitoring device, and a heat transfer tube to be tested. The heat transfer tube installation and fixing device is located inside the heat transfer tube vibration experimental section device, the heat transfer tube to be tested is installed in the heat transfer tube installation and fixing device, the heat transfer tube to be tested is slidably connected to the heat transfer tube installation and fixing device through a movable slider, the external sound signal device is installed on both sides of the heat transfer tube vibration experimental section device, the vibration signal monitoring device is pasted and arranged on the outer wall surface of the heat transfer tube to be tested, the heat transfer tube vibration experimental section device is a test section of an experimental wind tunnel, and its two ends are respectively connected to the contraction section and the diffusion section of the experimental wind tunnel equipment, and the heat transfer tube installation and fixing device comprises a heat transfer tube fixing connecting piece, a fixing frame, and a slide groove.

[0006] Preferably, the external sound signal device includes a signal generator, a power amplifier and a speaker, the vibration signal monitoring device includes an acceleration sensor and a data acquisition system, the acceleration sensor and the data acquisition system use a data line to transmit the vibration signal, and speaker mounting holes are provided on both side walls of the heat transfer tube vibration test section device, and the distance between the speaker and the central axis of the heat transfer tube to be tested is not greater than 1000mm.

[0007] Preferably, the movable slider is adapted to the slide groove, and the slide groove is symmetrically arranged at the upper and lower ends of the fixed frame, the fixed frame is a square structure, the cross-section of the slide groove is T-shaped, and a T-shaped buckle corresponding to the slide groove is provided on the top of the movable slider, and a columnar protrusion perpendicular to the side of the movable slider is provided on the side of the movable slider, and reserved holes are provided at both ends of the fixed connecting piece, and the columnar protrusions are adapted to the reserved holes.

[0008] Preferably, both ends of the heat transfer tube to be tested are provided with mounting plates, and the mounting plates are also provided with columnar protrusions perpendicular to the side surfaces of the mounting plates.

[0009] Preferably, the heat transfer tube test section device is a rectangular cavity, the size of its rectangular cross section is 500*500mm, and the length is 1100mm.

[0010] An experimental method for realizing heat transfer tube vibration based on an external sound field, the experimental method is completed by an experimental device, and comprises the following steps:

[0011] Step 1: First, fix the heat transfer tube to be tested in the heat transfer tube vibration test section device through the heat transfer tube installation fixture. Through the cooperation of the slide groove and the movable slider, the position of the heat transfer tube to be tested meets the design requirements, and the position relationship between the heat transfer tube to be tested and the speaker meets the angle between the axis of the heat transfer tube to be tested and the speaker meets the variation between 0-90°;

[0012] Step 2: Install the speakers of the external sound field device in the reserved installation holes on both sides of the heat transfer tube vibration test section device, ensuring the accuracy requirements during installation, and the highest point of the speaker's folding ring does not exceed the inner wall surface of the installation side wall of the heat transfer tube vibration test section device;

[0013] Step 3: Place the acceleration sensor connected to the data acquisition system close to the outer wall of the heat transfer tube to be tested;

[0014] Step 4: Keep the wind tunnel system closed, turn on the switch of the experimental equipment, adjust the signal generator to generate a signal of a certain frequency, input it into the speaker after the signal amplifier, and finally apply it to the heat transfer tube to be tested in the form of sound waves. At this time, the vibration data of the test is transmitted to the data collector through the acceleration sensor, save the data, turn off the equipment, and complete a signal test;

[0015] Step 5: Repeat step 4, adjust the signal generator to generate a signal with a frequency different from that of step 4, and complete the signal test;

[0016] Step 6: Repeat step 5, keep the signal generator generating a signal with the same frequency as step 5, adjust the power amplifier to generate a signal with different power, and complete a signal test;

[0017] Step 7: Turn on the speaker on one side only and repeat steps 4 to 6 to complete the signal test;

[0018] Step 8: Turn on the wind tunnel equipment, maintain a certain flow velocity value, and continue with steps 4-7;

[0019] Step 9: Turn on the wind tunnel equipment, adjust the incoming flow velocity value, which is different from the velocity value in step 8, and repeat steps 4-7 to complete the signal test;

[0020] Step 10: Adjust the position between the heat transfer tube to be tested and the speaker to change the distance between the two speakers. Repeat steps 4 to 7 to complete the signal test.

[0021] Preferably, the signal frequency range of the signal generator is 30-5KHz, which is a low frequency to medium frequency band, with a low frequency band of 30Hz-150Hz and a medium frequency band of 150Hz-5KHz.

[0022] The advantages and positive effects of the experimental device and method for realizing heat transfer tube vibration based on an external sound field described in the present invention are:

[0023] The present invention provides an experimental device and an experimental method to explore whether the huge noise generated during acoustic resonance or the huge noise generated when the gas flows around will cause vibration damage to the heat transfer tube or couple with other vibration mechanisms to intensify the vibration of the heat transfer tube and accelerate its damage. By judging the relationship between the vibration amplitude and the maximum amplitude of the heat exchange tube, it is judged whether the heat transfer tube is damaged under the influence of noise.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the experimental device of the present invention;

[0026] Figure 2 It is a schematic diagram of the heat transfer tube vibration experimental section device of the present invention;

[0027] Figure 3 It is a schematic diagram of a fixing frame in the experimental device of the present invention;

[0028] Figure 4It is a schematic diagram of the cross section of the chute in the experimental device of the present invention;

[0029] Figure 5 It is a schematic diagram of a fixed connection plate in the experimental device of the present invention;

[0030] Figure 6 It is a schematic diagram of a movable slider in the experimental device of the present invention;

[0031] Figure 7 Schematic diagram of the heat transfer tube to be tested in the experimental device of the present invention;

[0032] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0033] Fig. 9 It is a flow chart of the experimental method of the present invention;

[0034] Fig.10 Schematic diagram of the classification of flow-induced vibration mechanisms in heat exchangers.

[0035] Reference numerals

[0036] 1. Heat transfer tube vibration test section device; 2. Slide; 3. Fixing frame; 4. Acceleration sensor; 5. Heat transfer tube to be tested; 6. Signal generator; 7. Power amplifier; 8. Speaker; 9. Fixed connecting piece; 10. Reserved hole; 11. Mounting hole; 12. Movable slider; 13. Columnar bump; 14. T-shaped buckle; 15. Mounting plate. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0038] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Example

[0040] like Figure 1As shown, an experimental device for realizing heat transfer tube vibration based on an external sound field comprises a heat transfer tube vibration experimental section device 1, a heat transfer tube installation and fixing device, an external sound signal device, a vibration signal monitoring device, and a heat transfer tube 5 to be tested. The heat transfer tube installation and fixing device is located inside the heat transfer tube vibration experimental section device 1. The heat transfer tube 5 to be tested is installed in the heat transfer tube installation and fixing device. The heat transfer tube 5 to be tested is slidably connected to the heat transfer tube installation and fixing device through a movable slider 12. The external sound signal device is installed on both sides of the heat transfer tube vibration experimental section device 1. The vibration signal monitoring device is pasted and arranged on the outer wall surface of the heat transfer tube 5 to be tested. The heat transfer tube vibration experimental section device 1 is a test section of an experimental wind tunnel, and its two ends are respectively connected to the contraction section and the diffusion section of the experimental wind tunnel equipment. The heat transfer tube installation and fixing device comprises a heat transfer tube fixing connecting piece 9, a fixing frame 3, and a slide groove 2.

[0041] The external sound signal device includes a signal generator 6, a power amplifier 7 and a speaker 8. The signal generator 6 emits sound waves, which are amplified by the power amplifier 7 and transmitted to the speaker 8, and then the sound field signal is applied to the heat transfer tube 5 to be tested. The signal frequency range of the signal generator 6 is set to 30-5KHz, which is a low-frequency to medium-frequency band. The power amplifier 7 is used to amplify the sound wave simulation electrical signals of each frequency band (low frequency 30-150Hz, medium frequency 150-5KHz) to a certain extent. This process can be achieved by adjusting the gain button. Adjust the gain knob of the power amplifier 7 so that the maximum sound pressure level of the external sound field is greater than or equal to 100dB. The speaker 8 converts the amplified sound wave simulation electrical signals of each frequency band into sound waves for playback.

[0042] The vibration signal monitoring device includes an acceleration sensor 4 and a data acquisition system. The acceleration sensor 4 and the data acquisition system use a data line to transmit vibration signals. Figure 2 As shown, both side walls of the heat transfer tube vibration test section device 1 are provided with speaker 8 mounting holes 11, and the distance between the speaker 8 and the central axis of the heat transfer tube 5 to be tested is not greater than 1000 mm.

[0043] like Figure 3 As shown, the movable slider 12 is adapted to the slide slot 2, and the slide slot 2 is symmetrically arranged at the upper and lower ends of the fixed frame 3, and the fixed frame 3 is a cubic structure. Figure 4 As shown, the cross section of the slideway 2 is T-shaped. Figure 6 As shown, a T-shaped buckle 14 corresponding to the slide slot 2 is provided on the top of the movable slider 12, and a columnar protrusion 13 perpendicular to the side of the movable slider 12 is provided on the side of the movable slider 12. Figure 5 As shown, both ends of the fixing connecting piece 9 are provided with reserved holes 10 , and the columnar protrusions 13 are matched with the reserved holes 10 .

[0044] like Figure 7 and Figure 8As shown, both ends of the heat transfer tube 5 to be tested are provided with mounting plates 15 , and the mounting plates 15 are also provided with columnar protrusions 13 perpendicular to the side surfaces of the mounting plates 15 .

[0045] The heat transfer tube test section device is a rectangular cavity with a rectangular cross-section size of 500*500mm and a length of 1100mm.

[0046] The acceleration sensor 4 is pasted on the outer wall side of the heat transfer tube 5 to be tested, and the heat transfer tube 5 to be tested is connected to the reserved hole 10 at one end of the fixed connecting piece 9 through the columnar protrusion 13 on the mounting plate 15. The other set of reserved holes 10 on the fixed connecting piece 9 is connected to the columnar protrusion 13 on the movable slider 12. The T-shaped buckle on the installed movable slider 12 is matched with the slide groove 2 to complete the installation of the heat transfer tube. The installed fixing frame 3 is placed in the heat transfer tube vibration experimental section device 1. The loudspeaker 8 of the external sound signal device is installed in the reserved installation holes 11 on both sides of the heat transfer tube vibration experimental section device 1. The installation status of each device is checked to ensure the installation accuracy requirements, and the construction and installation of the experimental equipment are completed.

[0047] An experimental method for realizing heat transfer tube vibration based on an external sound field, the process is as follows: Fig. 9 As shown, the experimental method is completed through an experimental device, including the following steps:

[0048] Step 1: First, fix the heat transfer tube 5 to be tested in the heat transfer tube vibration test section device 1 through the heat transfer tube installation fixture. The position of the heat transfer tube 5 to be tested meets the design requirements through the cooperation of the slide groove 2 and the movable slider 12. The position relationship between the heat transfer tube 5 to be tested and the speaker 8 satisfies that the angle θ between the axis of the heat transfer tube 5 to be tested and the speaker 8 meets the variation between 0-90°, such as Figure 1 As shown;

[0049] Step 2: Install the loudspeaker 8 of the external sound field device into the reserved installation holes 11 on both sides of the heat transfer tube vibration test section device 1, ensuring the accuracy requirements during installation, and the highest point of the folded ring of the loudspeaker 8 does not exceed the inner wall surface of the installation side wall of the heat transfer tube vibration test section device 1;

[0050] Step 3: Place the acceleration sensor 4 connected to the data acquisition system close to the outer wall of the heat transfer tube 5 to be tested;

[0051] Step 4: Keep the wind tunnel system closed, turn on the switch of the experimental equipment, adjust the signal generator 6 to generate a signal of a certain frequency, input it into the speaker 8 after the signal amplifier, and finally apply it to the heat transfer tube 5 to be tested in the form of sound waves. At this time, the vibration data of the test is transmitted to the data collector through the acceleration sensor 4, save the data, turn off the equipment, and complete a signal test;

[0052] Step 5: Repeat step 4, adjust the signal generator 6 to generate a signal with a frequency different from that of step 4, and complete the signal test;

[0053] Step 6: Repeat step 5, keep the signal generator generating a signal with the same frequency as step 5, adjust the power amplifier 7 to generate a signal with different power, and complete a signal test;

[0054] Step 7: Turn on the speaker 8 on one side only, and repeat steps 4 to 6 to complete the signal test;

[0055] Step 8: Turn on the wind tunnel equipment, maintain a certain flow velocity value, and continue with steps 4-7;

[0056] Step 9: Turn on the wind tunnel equipment, adjust the incoming flow velocity value, which is different from the velocity value in step 8, and repeat steps 4-7 to complete the signal test;

[0057] Step 10: Adjust the position between the heat transfer tube 5 to be tested and the loudspeaker 8 so that the distance between the heat transfer tube 5 to be tested and the loudspeaker 8 changes. Repeat steps 4 to 7 to complete the signal test.

[0058] Without turning on the wind tunnel equipment, turning on the external sound signal device, including turning on the signal generator 6, the power amplifier 7, and the speaker 8, turning on the vibration signal detection device, adjusting the signal generator 6 to generate a sine wave signal of a certain frequency, adjusting the power amplifier 7 to generate a signal of a certain power and inputting it into the speaker 8, turning on the vibration signal monitoring device, collecting the vibration information of the heat transfer tube under this sound signal; adjusting the signal generator 6 to generate a signal with a frequency different from the previous one, keeping other unchanged, and continuing to complete a signal test; keeping the signal frequency generated by the signal generator 6 unchanged, adjusting the power amplifier 7 to generate signals with different powers, and completing the vibration signal test; turning on the wind tunnel equipment, maintaining a certain incoming flow speed, and completing the above experimental operation methods and steps; changing the incoming flow speed of the wind tunnel, repeating the above experimental methods and steps, and completing the experimental test.

[0059] In the field of heat exchangers, the mechanisms of fluid-induced tube bundle vibration include the following four categories: turbulent buffeting, vortex shedding-induced vibration, fluid-elastic instability, and acoustic resonance, such as Fig.10 As shown. The acoustic resonance is only considered in the heat exchanger whose shell medium is gas.

[0060] As the efficiency of heat exchanger design continues to improve, the flow rate increases accordingly, resulting in some flow-induced noise-induced acoustic resonance. After acoustic resonance occurs, the noise amplitude will increase significantly. In order to explore whether the huge noise generated when acoustic resonance occurs will cause vibration damage to the heat transfer tube or couple with other vibration mechanisms to intensify the vibration of the heat transfer tube and accelerate its damage.

[0061] According to Appendix C of the GB / T151-2014 heat exchanger standard, when the maximum amplitude ymax of the heat exchange tube is greater than 0.02d (d is the diameter of the heat transfer tube, mm), the heat transfer tube will be unstable and damaged. Through the experimental method designed by the present invention, the relationship between An and ymax is judged to determine whether the heat transfer tube is damaged under the influence of noise. The effect of the experimental method according to the present invention is shown in Table 1.

[0062] Table 1

[0063]

[0064]

[0065] Application Example 1

[0066] The signal generator 6 is adjusted to generate a sound signal with a frequency of Fsound=0, and the power amplifier 7 and the speaker 8 are adjusted to generate a sound signal with a sound pressure level of 0dB, that is, no external sound field is applied; the wind tunnel equipment is not turned on, that is, the incoming flow velocity is 0, and the acceleration sensor 4 is used to test the vibration acceleration at this time and obtain the vibration signal of the heat transfer tube after signal processing. At this time, the heat transfer tube does not vibrate, and its vibration amplitude is 0, that is, A1=0. At this time, it can be determined that A1<0.02d, so under this condition, the heat transfer tube is not damaged.

[0067] Application Example 2

[0068] The signal generator 6 is adjusted to generate a sound signal with a frequency of Fsound=fheat transfer tube, and the power amplifier 7 and the speaker 8 are adjusted to generate a sound signal with a sound pressure level of 100dB. The wind tunnel equipment is not turned on, that is, the incoming flow velocity is 0, and the acceleration sensor 4 is used to test the vibration acceleration at this time and obtain the vibration signal of the heat transfer tube after signal processing. It can be judged that the heat transfer tube has a slight vibration at this time, and its vibration amplitude is A3. The vibration signal of the heat transfer tube is monitored by the vibration signal monitoring device, and A0<A3<0.02d is obtained. Therefore, the heat transfer tube has vibrated at this time, but the vibration amplitude is small, and the heat transfer tube has not been damaged.

[0069] Application Example 3

[0070] The signal generator 6 is adjusted to generate a sound signal with a frequency of Fsound=f of the heat transfer tube, and the power amplifier 7 and the speaker 8 are adjusted to generate a sound signal with a sound pressure level of 100 dB. The wind tunnel equipment is turned on, and a certain incoming flow velocity V is set. At this time, the heat transfer tube vibrates, and its vibration amplitude is A4. The acceleration sensor 4 is used to test the vibration acceleration at this time, and the vibration signal of the heat transfer tube is obtained through signal processing, and A4>A3 is obtained. Therefore, the heat transfer tube vibrates at this time, and its amplitude value is greater than the amplitude value in Application Example 2.

[0071] Therefore, the present invention adopts the above-mentioned experimental device and method for realizing the vibration of the heat transfer tube based on an external sound field, so as to provide an experimental device and an experimental method for exploring whether the huge noise generated by acoustic resonance or gas flow will cause vibration damage to the heat transfer tube or couple with other vibration mechanisms to intensify the vibration of the heat transfer tube and accelerate its damage.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An experimental device for realizing heat transfer tube vibration based on an external sound field, comprising a heat transfer tube vibration experimental section device, a heat transfer tube installation and fixing device, an external sound signal device, a vibration signal monitoring device, and a heat transfer tube to be tested, characterized in that: The heat transfer tube installation and fixing device is located inside the heat transfer tube vibration test section device. The heat transfer tube to be tested is installed in the heat transfer tube installation and fixing device. The heat transfer tube to be tested is slidably connected to the heat transfer tube installation and fixing device through a movable slider. The external sound signal device is installed on both sides of the heat transfer tube vibration test section device. The vibration signal monitoring device is pasted and arranged on the outer wall surface of the heat transfer tube to be tested. The heat transfer tube vibration test section device is a test section of the experimental wind tunnel, and its two ends are respectively connected to the contraction section and the diffusion section of the experimental wind tunnel equipment. The heat transfer tube installation and fixing device includes a heat transfer tube fixing connecting piece, a fixing frame, and a slide groove.

2. The experimental device for realizing heat transfer tube vibration based on an external sound field according to claim 1, characterized in that: The external sound signal device includes a signal generator, a power amplifier and a speaker. The vibration signal monitoring device includes an acceleration sensor and a data acquisition system. The acceleration sensor and the data acquisition system use a data line to transmit vibration signals. Speaker mounting holes are provided on both side walls of the heat transfer tube vibration test section device. The distance between the speaker and the central axis of the heat transfer tube to be tested is not greater than 1000 mm.

3. The experimental device for realizing heat transfer tube vibration based on an external sound field according to claim 1, characterized in that: The movable slider is adapted to the slide groove, and the slide groove is symmetrically arranged at the upper and lower ends of the fixed frame. The fixed frame is a square structure, and the cross-section of the slide groove is T-shaped. A T-shaped buckle corresponding to the slide groove is provided on the top of the movable slider, and a columnar protrusion perpendicular to the side of the movable slider is provided on the side of the movable slider. Reserved holes are provided at both ends of the fixed connecting piece, and the columnar protrusions are adapted to the reserved holes.

4. The experimental device for realizing heat transfer tube vibration based on an external sound field according to claim 1, characterized in that: Both ends of the heat transfer tube to be tested are provided with mounting plates, and the mounting plates are also provided with columnar protrusions perpendicular to the side surfaces of the mounting plates.

5. The experimental device for realizing heat transfer tube vibration based on an external sound field according to claim 1, characterized in that: The heat transfer tube vibration test section device is a rectangular cavity, the size of its rectangular cross section is 500*500mm, and the length is 1100mm.

6. An experimental method for realizing heat transfer tube vibration based on an external sound field, characterized in that: The experimental method is accomplished by the experimental device according to any one of claims 1 to 5, and comprises the following steps: Step 1: First, fix the heat transfer tube to be tested in the heat transfer tube vibration test section device through the heat transfer tube installation fixture. Through the cooperation of the slide groove and the movable slider, the position of the heat transfer tube to be tested meets the design requirements, and the position relationship between the heat transfer tube to be tested and the speaker meets the angle between the axis of the heat transfer tube to be tested and the speaker meets the variation between 0-90°; Step 2: Install the speakers of the external sound field device in the reserved installation holes on both sides of the heat transfer tube vibration test section device, ensuring the accuracy requirements during installation, and the highest point of the speaker's folding ring does not exceed the inner wall surface of the installation side wall of the heat transfer tube vibration test section device; Step 3: Place the acceleration sensor connected to the data acquisition system close to the outer wall of the heat transfer tube to be tested; Step 4: Keep the wind tunnel system closed, turn on the switch of the experimental equipment, adjust the signal generator to generate a signal of a certain frequency, input it into the speaker after the signal amplifier, and finally apply it to the heat transfer tube to be tested in the form of sound waves. At this time, the vibration data of the test is transmitted to the data collector through the acceleration sensor, save the data, turn off the equipment, and complete a signal test; Step 5: Repeat step 4, adjust the signal generator to generate a signal with a frequency different from that of step 4, and complete the signal test; Step 6: Repeat step 5, keep the signal generator generating a signal with the same frequency as step 5, adjust the power amplifier to generate a signal with different power, and complete a signal test; Step 7: Turn on the speaker on one side only and repeat steps 4 to 6 to complete the signal test; Step 8: Turn on the wind tunnel equipment, maintain a certain flow velocity value, and continue with steps 4-7; Step 9: Turn on the wind tunnel equipment, adjust the incoming flow velocity value, which is different from the velocity value in step 8, and repeat steps 4-7 to complete the signal test; Step 10: Adjust the position between the heat transfer tube to be tested and the speaker to change the distance between the two speakers. Repeat steps 4 to 7 to complete the signal test.

7. The experimental method for realizing heat transfer tube vibration based on an external sound field according to claim 6, characterized in that: The signal frequency range of the signal generator is 30-5KHz, which is a low frequency to medium frequency band, the low frequency band is 30Hz-150Hz, and the medium frequency band is 150Hz-5KHz.

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