阅读说明：本技术 一种利用干、湿气流产生次声的装置 (Device for generating infrasound by using dry and wet air flows ) 是由 翟国庆 姚瑶 陈聪 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种利用干、湿气流产生次声的装置,属于次声发生装置技术领域,包括出风口相对设置的干气流管道和湿气流管道,在干气流管道和湿气流管道的出风口汇合处设有混合气流管道,各管道内设有等间距排列的支撑杆；干气流管道和湿气流管道的出风口设有用于将两侧气流引入混合气流管道的导流板。本发明结合气爆式、气流声源式两种方式产生次声,利用干、湿气流动压、温度、水汽含量不同,使干、湿两股气流通过导流板混合,气流管道中等间隔排布的支撑杆等技术产生高强度次声。相对于现有次声发声器,具有次声频率可调、强度更高的特点。(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.)

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.

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.