CN110860451A - Device for generating infrasound by using dry and wet air flows - Google Patents
Device for generating infrasound by using dry and wet air flows Download PDFInfo
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- CN110860451A CN110860451A CN201911096534.8A CN201911096534A CN110860451A CN 110860451 A CN110860451 A CN 110860451A CN 201911096534 A CN201911096534 A CN 201911096534A CN 110860451 A CN110860451 A CN 110860451A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/20—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of a vibrating fluid
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
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- Jet Pumps And Other Pumps (AREA)
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Abstract
The invention discloses a device for generating infrasound by utilizing dry and wet airflow, belonging to the technical field of infrasound generating devices, comprising a dry airflow pipeline and a wet airflow pipeline, wherein the air outlets of the dry airflow pipeline and the wet airflow pipeline are oppositely arranged; the air outlets of the dry airflow pipeline and the wet airflow pipeline are provided with guide plates for introducing airflow at two sides into the mixed airflow pipeline. The invention combines two modes of an air explosion type and an air flow sound source type to generate infrasound, and utilizes the different dynamic pressure, temperature and water vapor content of dry air flow and wet air flow to mix the dry air flow and the wet air flow through a guide plate, and the technologies of support rods arranged at equal intervals in an air flow pipeline and the like to generate high-strength infrasound. Compared with the existing infrasound generator, the infrasound generator has the characteristics of adjustable infrasound frequency and higher intensity.
Description
Technical Field
The invention relates to the technical field of infrasound generating devices, in particular to a device for generating infrasound by utilizing dry and wet air flows.
Background
Infrasound is a sound wave having a frequency lower than 20Hz, and can be classified into natural infrasound (originating from volcanic eruptions, earthquakes, tsunamis, etc.) and artificial infrasound (originating from industrial production, transportation, aerospace, aviation, etc.) according to its origin. The infrasound has strong penetrating power and long propagation distance, and can be applied to various fields, such as civil fields, and the infrasound can be used for detecting mineral deposits, checking machine hidden dangers, removing dust and the like; in the military industry, infrasound is used as an attacking means, and the like. Therefore, research and development of the high-intensity secondary sound generator are of great significance.
At present, the devices for generating infrasound are mainly disclosed as follows: (1) the gas explosion type infrasonic generator is characterized by small volume, low frequency and easy control, but low sound wave intensity and energy conversion efficiency and poor orientation performance; (2) the explosion type infrasonic generator adopts a piston or an explosive to drive a pulser, so that compressed air enters a conduit to generate infrasonic waves, or strong infrasonic waves are generated by explosion, but sectional explosion in the method is difficult to control; (3) a pipe-type infrasound generator which generates a strong infrasound wave by using the condition that the vibration of an air column in a pipe is the same as the natural frequency of the pipe; (4) the loudspeaker type infrasound generator adopts a special vibrating diaphragm, generates infrasound with certain frequency by the vibration of the diaphragm, and has the defects that the circumference of the diaphragm is equivalent to the wavelength of the infrasound, and the conversion efficiency is low; (5) the rotary infrasound generator generates infrasound by controlling the rotation frequency of the fan and dynamically controlling the rotation of the fan, and the method has high energy conversion efficiency; (6) the beat type infrasound generator of frequency difference, it adopts the sound generator of two different frequencies to work at the same time, utilize their frequency difference to obtain the infrasound, the energy conversion efficiency of this method is high and can make the small-scale weapon; (7) the airflow sound source generator converts high-pressure or high-speed airflow energy into sound energy through a certain pneumatic process, and has the characteristics of high efficiency and high power.
The design of the infrasound generating device needs to consider the problems of infrasound intensity, energy conversion efficiency, directional beam bunching propagation, sound source volume and the like. The traditional infrasound generator usually adopts a single infrasound generation method, and has low energy conversion efficiency and small infrasound intensity.
Disclosure of Invention
The invention aims to provide a device for generating infrasound by utilizing dry and wet air flows, which has high infrasound generation efficiency and is convenient for adjusting the frequency of the infrasound.
In order to achieve the purpose, the device for generating infrasound by utilizing dry airflow and wet airflow comprises a dry airflow pipeline and a wet airflow pipeline, wherein the air outlets of the dry airflow pipeline and the wet airflow pipeline are oppositely arranged; the air outlets of the dry airflow pipeline and the wet airflow pipeline are provided with guide plates for introducing airflow at two sides into the mixed airflow pipeline.
In the technical scheme, infrasound is generated by combining two modes of an air explosion mode and an air flow sound source mode, and high-strength infrasound is generated by using the technologies of mixing dry air flow and wet air flow through the guide plate, using different dynamic pressures of the dry air flow and the wet air flow, using different temperatures and water vapor contents, and using the supporting rods arranged at equal intervals in the air flow pipeline and the like. Compared with the existing infrasound generator, the infrasound generator has the characteristics of adjustable infrasound frequency and higher intensity.
In order to realize the regulation of dynamic pressure, temperature and water vapor content of the air flow in each pipeline, preferably, the dry air flow pipeline is internally and sequentially provided with an induced draft fan, an air speed regulator, a dehumidifier and an air flow temperature regulator along the air inlet, and the wet air flow pipeline is internally and sequentially provided with an induced draft fan, an air speed regulator, a humidifier and an air flow temperature regulator along the air inlet.
In order to improve the radiation efficiency of infrasound, it is preferable that the end portion of the mixed gas flow duct is provided with a radiation horn for improving the efficiency of radiating infrasound outward.
In order to maintain a certain air flow pressure difference between the dry and wet air flow ducts, it is preferred that the air flow velocity in one of the air flow ducts is at least 1.5 times the air flow velocity in the other air flow duct in the dry and wet air flow ducts.
Preferably, the relative humidity in the dry gas stream duct is below 20% to maintain sufficient dryness of the gas stream in the dry gas stream duct; the relative humidity in the wet gas flow pipeline is more than 80%, so that the gas flow in the wet gas flow pipeline contains a large amount of small liquid drops. In the dry, moisture flow gets into mixed gas flow pipeline through the guide plate, because both air current dynamic pressures are different, the big air current of dynamic pressure can flow to the little air current side of dynamic pressure in the short time, and along with the air current pressure increases fast in the little air current pipeline of dynamic pressure, the air current flow direction changes very fast, dry, the wet air current is in the certain regional periodic oscillation (flow) in guide plate top promptly, similar to the vibration of gas piston post, produces the infrasound, and the strongest infrasound frequency is unanimous with the oscillation frequency.
Preferably, the temperature of the air flow at the air flow outlet of the dry air flow pipeline is higher than 130 ℃, and the temperature of the air flow at the air flow outlet of the wet air flow pipeline is 50-80 ℃. The dry air flow and the wet air flow enter the mixed air flow pipeline through the guide plate, because the temperature of the dry air flow is higher than 130 ℃, when the dry air flow and the wet air flow are mixed, small liquid drops in the wet air flow are violently vaporized, the volume of the air near the top of the guide plate is sharply increased, instantaneous high pressure is generated, the pressure of the air is higher than the pressure of the dry air flow end and the wet air flow end on the two sides of the guide plate in a short time, and the flow paths of the dry air flow and the wet. Because the top of the mixed gas flow pipeline is open, the instantaneous high pressure near the top of the guide plate can be quickly released, and under the condition of continuous air supply of the draught fan, the gas flow pressure in the dry gas flow pipeline and the wet gas flow pipeline is increased, the dry gas flow and the wet gas flow are mixed again at the top of the guide plate in a short time to generate the instantaneous high pressure, so that the operation is repeated, the operation is similar to a classical 'gas explosion type silencer', strong infrasound is generated, and the infrasound frequency is consistent with the intermittent 'gas explosion' frequency.
Preferably, the support rods are provided so as to intersect two of the airflow ducts on the same cross section and are arranged at equal intervals in the axial direction of the ducts.
Preferably, the cross-sectional shape of the support rod is circular or rectangular. The support rods are arranged in the linear dry and wet airflow pipelines and the mixed airflow pipeline (without guide plate sections), and are arranged in parallel at equal intervals along the pipelines. When the airflow passes through the periodically arranged support rods, the airflow is periodically modulated, and infrasound with specific frequency can be generated.
Secondly, the infrasound intensity is related to the air flow speed and the material, shape and length of the support rods, and the infrasound frequency is related to the periodic modulation frequency, which is about the ratio of the air flow speed to the support rod spacing, for example, if the air flow speed is 16m/s and the support rod spacing is 2m, the infrasound frequency generated is 8 Hz. The spacing of the supporting rods can be adjusted when the infrasound frequency is adjusted.
Compared with the prior art, the invention has the beneficial effects that:
according to the infrasound generation principle, the gas explosion type infrasound generation method and the airflow sound source type infrasound generation method are combined, and high-intensity infrasound with specific frequency is generated by utilizing the difference of dynamic pressure, temperature and water vapor content of dry airflow and wet airflow; the supporting rods arranged in parallel at equal intervals in the airflow pipeline are used for periodically modulating the airflow, so that the infrasound intensity of specific frequency can be effectively improved; meanwhile, the guide plate vibrates violently by utilizing the pressure difference generated when the dry air flow and the wet air flow are mixed and subjected to air explosion, and the vibration can be transmitted to the dry air flow pipeline, the wet air flow pipeline and the mixed air flow pipeline through the structure to cause the pipeline wall to vibrate violently, radiate strong infrasound and further improve the intensity of the infrasound. The infrasound generating efficiency of the whole device is high, and the infrasound frequency is convenient to adjust.
Drawings
FIG. 1 is a schematic diagram of an apparatus for generating infrasound using dry and wet air flows in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional layout of support rods in an airflow duct in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings.
Examples
Referring to fig. 1 and 2, the device for generating infrasound by using dry and wet airflows of the present embodiment includes a dry airflow pipeline 6, a wet airflow pipeline 5 and a mixed airflow pipeline 4, the air outlets of the dry airflow pipeline 6 and the wet airflow pipeline 5 are oppositely arranged, and the airflows of the two pipelines are introduced into the mixed airflow pipeline 4 through a guide plate 3, the dry airflow pipeline 6 and the wet airflow pipeline 5 are both connected with the mixed airflow pipeline 4, and the interfaces are the same, and the guide plate 3 is located at the intersection of the dry airflow pipeline 6, the wet airflow pipeline 5 and the mixed airflow pipeline 4. The support rods 2 which are arranged at equal intervals are arranged in each pipeline, the end part of the mixed airflow pipeline 4 is provided with the radiation horn 1, and the radiation horn 1 is connected with the mixed airflow pipeline 4, so that the efficiency of radiating infrasound outwards can be effectively improved.
An induced draft fan, an air speed regulator, a dehumidifier and an air flow temperature regulator are sequentially arranged in the dry air flow pipeline 6 along the air inlet inwards, and the induced draft fan, the air speed regulator, the humidifier and the air flow temperature regulator are sequentially arranged in the wet air flow pipeline 5 along the air inlet inwards. In this embodiment, the support rods 2 are cylindrical, have a diameter of 70mm, and comprise two cross-shaped support rods 2 on the cross section of the same airflow pipeline.
In this embodiment, the air speed regulators in the dry air flow duct 6 and the wet air flow duct 5 can regulate the air flow speed, preferably 10m/s or more, by means of dampers, i.e., by changing the dynamic pressure of the air flow in the ducts. The air flow speed in the wet air flow pipeline 5 is adjusted to be more than 1.5 times of the air flow speed in the dry air flow pipeline 6 through the two air speed regulators, so that a large dynamic pressure difference exists between the air flows in the dry air flow pipeline 6 and the wet air flow pipeline 5. The dehumidifier in the dry gas flow duct 6 is effective in reducing the water vapour content of the gas flow to ensure a relative humidity below 20%. The humidifier in the wet gas flow pipe 5 can further improve the water vapor content of the gas flow, and ensure that the relative humidity is above 80%, so that a large number of small liquid drops are contained in the gas flow. The airflow temperature regulator is used for increasing the temperature of the airflow, so that the temperature of the airflow in the dry airflow pipeline 6 is higher than 130 ℃, the preferable temperature of the airflow is 150 ℃, and the temperature of the airflow in the wet airflow pipeline 5 is between 50 and 80 ℃, and the preferable temperature of the airflow is 70 ℃.
In dry, in the moisture flows through guide plate 3 entering mixed gas flow pipeline 4, because wet airflow velocity is about 1.5 times more than dry airflow velocity, wet air current can flow to the dry air current side in the short time, and along with the rapid increase of air current pressure in dry gas flow pipeline 6, the air current flow direction becomes dry air current flow to the moisture flow side very fast, dry, wet air current is in guide plate 3 top certain area internal periodic oscillation (flow), similar to the vibration of gas piston post, produce the infrasound, and the strongest infrasound frequency is unanimous with the oscillation frequency.
Because the temperature of the dry gas flow is higher than 130 ℃, when the dry gas flow is mixed with the wet gas flow, small liquid drops in the wet gas flow are violently vaporized, the gas volume near the top of the guide plate 3 is sharply increased, instantaneous high pressure is generated, the pressure of the gas flow is higher than the pressure of the dry gas flow end and the wet gas flow end on the two sides of the guide plate 3 in a short time, and the flow paths of the dry gas flow and the wet gas flow are blocked in a short time. Because the top of the mixed gas flow pipeline 4 is opened, the instantaneous high pressure near the top of the guide plate 3 can be quickly released, and under the continuous air supply of the draught fan, the gas flow pressure in the dry gas flow pipeline 6 and the wet gas flow pipeline 5 is also increased, and the dry gas flow and the wet gas flow are mixed again at the top of the guide plate 3 in a short time to generate the instantaneous high pressure, so that the operation is repeated, the operation is similar to a classical 'gas explosion type silencer', strong infrasound is generated, and the infrasound frequency is consistent with the intermittent 'gas explosion' frequency.
When the airflow flows through the supporting rods 2 which are arranged in parallel at equal intervals, the airflow is modulated periodically, infrasound with specific frequency can be generated, the intensity of the infrasound is related to the speed of the airflow and the material, shape and length of the supporting rods 2, and the relationship between the infrasound frequency and the periodic modulation frequency satisfies the following formula:
wherein f is frequency in Hz; v is the air flow velocity in m/s; d is the spacing of the support rods arranged in parallel, and the unit is m. If the air flow speed is 16m/s and the distance between the support rods is 2m, the infrasound frequency generated by the support rods is 8 Hz.
In addition, the guide plate 3 generates violent vibration in the process of intermittent gas explosion, and the mechanism is that when dry and wet air flows are mixed to generate gas explosion, obvious pressure difference exists on two sides of different positions of the guide plate 3 to enable the guide plate 3 to generate violent deformation, after the pressure of the gas explosion is relieved through the top opening of the mixed air flow pipeline 4, the pressure difference on two sides of different positions of the guide plate 3 is obviously reduced, the deformation of the guide plate 3 is recovered to be before the gas explosion, namely, the guide plate 3 vibrates violently in the process of the intermittent gas explosion and radiates intense infrasound. The vibration of the guide plate 3 can be transmitted to the dry airflow pipeline 6, the wet airflow pipeline 5 and the mixed airflow pipeline 4 through the structure, so that the pipeline walls vibrate violently and radiate intense infrasound. The above infrasonic frequencies are all close to the intermittent gas explosion frequency.
The above description is only exemplary of the general embodiments of the present invention, and should not be taken as limiting the invention, as any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A device for generating infrasound by utilizing dry and wet airflow is characterized by comprising a dry airflow pipeline and a wet airflow pipeline, wherein air outlets of the dry airflow pipeline and the wet airflow pipeline are oppositely arranged;
and the air outlets of the dry airflow pipeline and the wet airflow pipeline are provided with guide plates for introducing airflow at two sides into the mixed airflow pipeline.
2. The apparatus as claimed in claim 1, wherein the dry airflow duct is provided with an induced draft fan, an air speed regulator, a dehumidifier and an airflow temperature regulator in sequence along the air inlet; the wet airflow pipeline is internally provided with an induced draft fan, an air speed regulator, a humidifier and an airflow temperature regulator in sequence along the air inlet.
3. The apparatus for generating infrasound using dry and wet airflows of claim 1, wherein the end of the mixed airflow duct is provided with a radiating horn for increasing the efficiency of radiating infrasound outwardly.
4. The apparatus of claim 1 wherein the dry gas flow duct and the wet gas flow duct are configured such that the velocity of the gas in one of the gas flow ducts is at least 1.5 times the velocity of the gas in the other gas flow duct.
5. The apparatus of claim 1 wherein the dry and wet airflow path has a relative humidity of less than 20%; the relative humidity in the wet airflow pipeline is above 80%.
6. The apparatus of claim 1, wherein the temperature of the air flow at the air flow outlet of the dry air flow duct is higher than 130 ℃ and the temperature of the air flow at the air flow outlet of the wet air flow duct is between 50 ℃ and 80 ℃.
7. The apparatus as claimed in claim 1, wherein the support rods are arranged on the same cross section of the air flow duct in a crossing manner and are arranged at equal intervals in the axial direction of the duct.
8. The apparatus for generating infrasound using dry and wet airflows of claim 1, wherein the support bar has a circular or rectangular cross-sectional shape.
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| CN201911096534.8A CN110860451B (en) | 2019-11-11 | 2019-11-11 | Device for generating infrasound by using dry and wet air flows |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055066U (en) * | 1989-01-18 | 1990-03-28 | 郑平 | Infrasonic and low-frequency sonic generator |
| CN101363698A (en) * | 2007-08-08 | 2009-02-11 | 杨伦华 | Infrasonic wave generator |
| CN101480647A (en) * | 2009-01-20 | 2009-07-15 | 王卫东 | Method for producing infrasonic wave and medical infrasonic wave generator using the method |
| CN203070753U (en) * | 2013-01-31 | 2013-07-17 | 中国人民解放军国防科学技术大学 | Discrete push-pull air-flow excitation type infrasonic-wave generator |
| CN105537091A (en) * | 2015-11-23 | 2016-05-04 | 西北工业大学 | Infrasonic wave synthetic method and device based on heterodyne frequency type and parametric acoustic array technology |
| WO2018080367A1 (en) * | 2016-10-31 | 2018-05-03 | Mats Olsson | An infrasound generator for enhancing the combustion of solid fuels |
-
2019
- 2019-11-11 CN CN201911096534.8A patent/CN110860451B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055066U (en) * | 1989-01-18 | 1990-03-28 | 郑平 | Infrasonic and low-frequency sonic generator |
| CN101363698A (en) * | 2007-08-08 | 2009-02-11 | 杨伦华 | Infrasonic wave generator |
| CN101480647A (en) * | 2009-01-20 | 2009-07-15 | 王卫东 | Method for producing infrasonic wave and medical infrasonic wave generator using the method |
| CN203070753U (en) * | 2013-01-31 | 2013-07-17 | 中国人民解放军国防科学技术大学 | Discrete push-pull air-flow excitation type infrasonic-wave generator |
| CN105537091A (en) * | 2015-11-23 | 2016-05-04 | 西北工业大学 | Infrasonic wave synthetic method and device based on heterodyne frequency type and parametric acoustic array technology |
| WO2018080367A1 (en) * | 2016-10-31 | 2018-05-03 | Mats Olsson | An infrasound generator for enhancing the combustion of solid fuels |
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