CN108801444A - Array type thermoacoustic generator - Google Patents
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The invention provides an array type thermoacoustic generator, which comprises at least two thermoacoustic generator units; a converging tube having at least two input channels and an output port; and an open resonator tube; each thermoacoustic generator unit is connected with one input channel of the convergence tube, the output ends of the input channels of the convergence tube are crossed, the output port is arranged at the crossed position, the output port is connected with the open type resonance tube, and the output end impedance of each thermoacoustic generator unit, the length of each input channel and the diameter of the tube can enable the crossed position of the convergence tube to form the effect of wave crest and wave crest superposition, and wave trough superposition. The array type thermoacoustic generator has high sound intensity, long action distance and strong directivity; the problems of low sound pressure, complex device, poor acoustic performance repeatability and the like of the conventional low-frequency sound generator can be solved, and industrial application of a basic sound source and a high-sound-intensity sound source can be provided for experimental study of low-frequency remote noise.
Description
Technical field
The present invention relates to technical field of acoustics, specifically, the present invention relates to acoustic transducer technical fields.
Background technology
Acoustic transducer currently on the market is mainly electroacoustic transducer, including dynamic transducer, electromagnetic transduction,
Capacitance-type transducer, piezoelectric transducer, magnetostriction transducer etc..Wherein electromagnetic transduction, capacitance-type transducer, pressure
Electric-type energy converter, magnetostriction transducer are limited by its principle of sound, are not suitable for doing low frequency playback.And electrodynamic type transducing
Simple and strong in structure, the high directivity of device, electroacoustic efficiency is high, but dynamic transducer is generally difficult to obtain larger transmitting sound
Power.
In addition, currently there is also the acoustic transducers of some other types, such as hydrokinetic type energy converter, laser sound source
Deng.Wherein, hydrokinetic type sound source is to convert the mechanical energy of fluid (gas or liquid) to vibrational excitation surrounding medium to generate
Sound wave.The hydrokinetic type sound source used at present has resonant cavity whistle (Hartmann acoustic generator), Perlman sonic generator, ultrasound
Siren, resonant wedge whistle and single hole or porous spray rotary valve etc..Hartmann acoustic generator excites in oil exploitation industry
Ultrasonic wave be widely used in de-plugging.The working frequency of such hydrokinetic type energy converter is nearly all fallen in kHz frequency range,
Have no the report of low frequency research.Such energy converter is all to excite sound wave using fluid jet as power source, in fluid sounding
In the process, flow field is coupled with sound field, and technology is still immature.
On the other hand, there are a kind of thermoacoustic systems based on thermotropic acoustic effect in refrigeration and technical field of power generation.It is thermotropic
Acoustic effect refers to compressibility gas in experience compression, heating, expansion in solid boundaries penetration depth layer in sound field
With exothermic thermodynamic cycle, sound is converted heat into.Early in 1850, Sondhauss had found：The closed glass marble in one end
The double glazing pipe for connecting one end open can make a sound in blind end heating.1962, University of New Mexico of the U.S.
Regenerator is added in Sondhauss pipes in Carter and his student Feldman, has greatly reinforced the thermoacoustic effect in pipe, has ground
Making First in the world has the thermoacoustic system of notable sound work(output.From raising thermoacoustic transformation efficiency, increase sound work(and engineering
From the point of view of, various countries thermoacoustic scholar has carried out extensive thermo-acoustic engine research, it is proposed that the closing sound of a variety of novelties
Structure is learned, has developed standing wave type, travelling-wave type and cascade connection type thermo-acoustic engine, to achieve the purpose that thermo-acoustic technology is gradually engineered.Mesh
Before, main application direction is thermoacoustic conversion to be realized in the thermoacoustic system of closing high pressure, and it is mixed to utilize sound wave (mechanical wave) to realize
Close gas separation, refrigeration and power generation.
2010, Slaton developed an open type standing wave thermoacoustic system, which only includes that opening Helmholtz is humorous
Vibration tube, plate is folded and hot and cold side heat exchanger, simple in structure, and resonant frequency can from 9Hz to 16Hz according to the different of resonance length of tube
It adjusts.Sound wave can directly be exported to airspace under conditions of it is 275W to input heat, go out voice by the standing wave thermoacoustic generator
It arbitrarily downgrades as 81dB.Slaton expects such open type thermoacoustic system after increasing substantially sound pressure level, as a kind of thermoacoustic form
Acoustic transducer, low-frequency sound source research etc. be applied.The course of work of the standing wave thermoacoustic generator is roughly divided into
Two steps：By thermal energy by the physical mechanism of thermoacoustic effect, gas medium vibration is driven to generate sound wave, while to external radiation.
Physical Chemistry Technology Inst., Chinese Academy of Sciences proposes a kind of open type traveling wave thermoacoustic generator (patent No.：
ZL201010592573.X), it realizes that heat harmony transformation of energy, the open type that can increase substantially Slaton are stayed using heat
The sound pressure level of wave thermoacoustic system.Further, 2011, beautiful wait of Xie Xiu successfully had developed this novel open type traveling wave thermoacoustic
Generator, under the input heat of 210W, outlet sound pressure level can reach 133dB.The open-type thermoacoustic generator is simple in structure, rises
Temperature of shaking is relatively low, is easy to starting of oscillation, can theoretically develop into a kind of novel acoustic transducer, plays and makees in low frequency field
With.However, the problems such as this technology is insufficient apart from short, the outside radiation sound intensity there is also radiation effects.Improve external radiation sound
There are two types of strong modes：First, further by passes such as regenerator, heat exchanger and resonatrons in open-type thermoacoustic generator
The size of key thermoacoustic element matches, to reach the optimization design of sound field, to improve the sound work(of itself generation, meanwhile, reduction is opened
The sound work(loss of mouth formula thermoacoustic generator itself；Second is that being designed by special thermoacoustic generator architecture, enhance external radiation
The sound intensity.However, the limited extent that above two method improves the radiation sound intensity is still difficult to meet usually within 10~20%
Over long distances, directive property requires high application scenario.
Invention content
The object of the present invention is to provide the solutions for the output sound work(that can significantly improve thermoacoustic generator.
The present invention provides a kind of array thermoacoustic generators, including at least two thermoacoustic generator units；With at least
The convergence pipe and open type resonatron of two input channels and a delivery outlet；
Wherein, an input channel of each thermoacoustic generator unit connection convergence pipe, each input of the convergence pipe
The output end in channel crosses, and the delivery outlet is arranged in intersection, and the delivery outlet is connect with the open type resonatron, respectively
Output terminal impedance, the length of each input channel and the value of caliber of a thermoacoustic generator unit enable to converge
The intersection of poly- pipe formed wave crest be superimposed with wave crest, the effect that trough is superimposed with trough.
Wherein, the sound pressure phase difference of the input channel intersection of the convergence pipe is less than 90 degree.
Wherein, each thermoacoustic generator unit output terminal impedance, each input channel length and caliber
Value enable to convergence pipe intersection simultaneously meet pressure continuity require and volume flow rate continuity require.
Wherein, each thermoacoustic generator unit output terminal impedance, each input channel length and caliber
Value make：
ZEqual pipe beginningFor the beginning impedance of equal pipe, it by poly- sound pipe opening impedance, the length of equal pipe and sectional area,
The line style and its sizecalculation that the profile of poly- sound pipe uses show that specific calculate can refer to document：Zhang Hailan, theoretical sound
It learns, Higher Education Publishing House, 2012：329-332.ZxoFor the terminal impedance of xth input channel, x=1,2 ..., N, N is convergence
The number of the input channel of pipe.Poly- sound pipe opening impedance can be calculated according to the radiation impedance of circular piston on infinitely great baffle,
It is related with opening radius, system operating frequency.In the case where poly- sound pipe size and system operating frequency determine, opening
Impedance is definite value, and specific calculate can refer to document：Du Gonghuan etc., Basic of Acoustics, publishing house of Nanjing University, 2001：356-362.
Wherein, for any one input channel x, beginning impedance ZxiIt calculates according to the following formula：
Wherein ZxoFor the terminal impedance of xth input channel, ZxCFor the acoustic characteristic impedance of xth input channel,
ρ0For atmospheric density, a is the velocity of sound, AxFor the sectional area of xth input channel, lxFor the length of input channel x, ω is corresponding
The working frequency of thermoacoustic generator unit.
For the thermoacoustic generator unit being connect with xth input channel, the structure of the thermoacoustic generator unit and set
Output terminal impedance when meter parameter enables to the thermoacoustic generator unit to work independently is equal or close to the calculated xth of institute
The sending-end impedance of input channel.
Wherein, between the thermoacoustic generator unit and the input channel of multichannel convergence pipe by the way of thread seal
Connection is also connected by the way of thread seal between the delivery outlet and open type resonatron of multichannel convergence pipe.
Wherein, each thermoacoustic generator unit is arranged at the mode of equal polygons.
Wherein, the thermoacoustic generator unit is arranged at array way.
Compared with existing open-type thermoacoustic generator, advantage of the invention is that：
1, the array thermoacoustic generator sound intensity of the invention is high, operating distance is long, and directive property is strong.
2, of the invention to solve that existing low-frequency sound generator acoustic pressure is low, device is complicated, acoustical behavior poor repeatability
The problems such as, the commercial Application of basic sound source and high sound intensity sound source can be provided for the remote noise experiment research of low frequency.
Description of the drawings
Hereinafter, carry out the embodiment that the present invention will be described in detail in conjunction with attached drawing, wherein：
Fig. 1 is the battle array based on two coaxial type open type traveling wave thermoacoustic generator units for showing invention one embodiment
Column thermoacoustic generator；
Fig. 2 shows the Section A-A figures of the array thermoacoustic generator of Fig. 1；
Fig. 3 shows the tool in one embodiment of the invention, and there are three the openings of the Triangle-Profile of thermoacoustic generator unit
The Section A-A figure of formula thermoacoustic generator array device；
Fig. 4 shows the tool in one embodiment of the invention, and there are four the openings of the square profile of thermoacoustic generator unit
The Section A-A figure of formula thermoacoustic generator array device；
Fig. 5 shows the tool in one embodiment of the invention, and there are five what the equal pentagons of thermoacoustic generator unit were distributed to open
The Section A-A figure of mouth formula thermoacoustic generator array device；
Fig. 6 shows the tool in one embodiment of the invention, and there are six what the equal hexagons of thermoacoustic generator unit were distributed to open
The Section A-A figure of mouth formula thermoacoustic generator array device；
Fig. 7 shows the Section A-A of the thermoacoustic generator unit array of the distribution of the matrix form in one embodiment of the invention
Figure.
Specific implementation mode
Following description and drawings will be apparent from the present invention open type thermoacoustic array generator Application Example and
Exemplary embodiments.However, it is possible to without prejudice to the principle of the invention, specific implementation mode is made various possible
Modifications and changes.
As it was noted above, existing open-type thermoacoustic generator there is also radiation effects apart from short, the outside radiation sound intensity not
The problems such as sufficient.It improves there are two types of the externally modes of the radiation sound intensity：First, further by open-type thermoacoustic generator
The size matching of the key thermoacoustic element such as regenerator, heat exchanger and resonatron, to reach the optimization design of sound field, to improve certainly
The sound work(that body generates, meanwhile, reduce the sound work(loss of open-type thermoacoustic generator itself；Second is that passing through special thermoacoustic generator
Structure design enhances the external radiation sound intensity.However, above two method improves the limited extent of the radiation sound intensity, usually 10
Within~20%, be still difficult to meet over long distances, directive property require high application scenario.And it inventors herein proposes a kind of completely new
Solution forms thermoacoustic generator array using multiple thermoacoustic generator units, and so that coming from each thermoacoustic occurs
The wave crest that the sound wave of device unit forms pressure wave in certain transmission range is superimposed with wave crest, the effect that trough is superimposed with trough
It answers, and then realizes the sound intensity at the increased communication effect of multiple, to significantly increase the acoustic pressure in entire thermoacoustic generating means exit
Grade.
Below in conjunction with the accompanying drawings come describe the present invention each embodiment.
Fig. 1 shows the battle array based on two coaxial type open type traveling wave thermoacoustic generator units of one embodiment of the invention
Column thermoacoustic generator.With reference to figure 1, which includes two thermoacoustic generator units 1, multichannel convergence
Pipe 2 and open type resonatron 3.Wherein, multichannel convergence pipe 2 includes corresponding respectively to two coaxial type open type traveling wave thermoacoustic hairs
Two input channels and a delivery outlet being connect with open type resonatron 3 of raw device unit.
Each coaxial type open-type thermoacoustic generator unit can be seen as an independent thermoacoustic generator, exit
Connecting multi-channel converges an input channel of pipe.In one example, each thermoacoustic generator list of array thermoacoustic generator
Built-in thermoacoustic element includes end tube, hot end heat exchanger, regenerator, cool end heat exchanger successively in the resonant chamber of member.It is working
When, hot end heat exchanger and cool end heat exchanger are that the temperature difference is established at regenerator both ends, when the temperature difference is more than the critical temperature difference of system, system
Starting of oscillation, generation sound work(.The standing wave ingredient for the sound work(that regenerator generates maintains oscillation, traveling wave ingredient to input multichannel convergence in locality
The corresponding channel of pipe 2.The internal structure of thermoacoustic generator unit can refer to：Document Swift G W.Thermoacoustic
engines.J Acoust Soc Am,1988,84(4):1145–1180；Slaton W V.An open-air
infrasonic thermoacoustic engine.Appl Acoust,2010,71:236-240, it repeats no more herein.
In the present embodiment, each thermoacoustic generator unit is all made of the identical working frequency (frequency of working frequency i.e. output sound work(
Rate).Fig. 2 shows the Section A-A figures of the array thermoacoustic generator of Fig. 1.
Multichannel convergence pipe is used to bring together the sound wave for coming from multiple thermoacoustic generator units, and by setting
Count specific input channel length and caliber so that come from the sound wave of each thermoacoustic generator unit in certain transmission range
The upper wave crest for forming pressure wave is superimposed with wave crest, the effect that trough is superimposed with trough, and then realizes the increased propagation of sound intensity multiple
Effect.
In order to enable the sound wave for coming from each thermoacoustic generator unit forms pressure wave in certain transmission range
Wave crest is superimposed with wave crest, the effect that trough is superimposed with trough, and multichannel convergence pipe meets claimed below simultaneously in design：
A) the continuity requirement of pressure：p11=p12=...=p1N；
B) volume flow rate continuity requirement：
Wherein ρ0For the density of working medium, p1xFor the oscillation pressure of the exits input channel X# working medium, u1xFor input channel X#
Exit working medium speed, AxFor when the cross-sectional area of input channel X#.Wherein, X indicates 1 any one integer for arriving N.Open type
Working medium in thermoacoustic generator is typically air.
The impedance at the beginning (inlet) and terminal (exit) of input channel 1# is expressed as Z1iAnd Z1o, channel 2#
The impedance at beginning and terminal be expressed as Z2iAnd Z2o, the beginning of channel N# and the impedance of terminal are expressed as ZNiAnd ZNo,
Then
Wherein l1, l2..., lNFor the length of input channel 1#~N#, ω is the design frequency of whole system, i.e., entire battle array
The working medium frequency of oscillation of column thermoacoustic generator.This frequency of oscillation is determined jointly by each thermoacoustic generator unit structure size
Fixed, usually, each thermoacoustic generating unit is all made of identical working frequency.lxIt is xth channel (i.e. input channel channel
X# length), wherein x=1,2 ..., N.In the present embodiment, the length of the central axes in the channel that the length in a channel refers to.
The delivery outlet of each thermoacoustic generator unit is exactly the input port in corresponding channel.The convergent point of each channel central axes, depending on
For the delivery outlet in each channel.For any channel, after determining its input port and delivery outlet, you can determine the length of its central axes
Degree, to obtain corresponding lxValue.
In the present embodiment, open type resonatron includes equal pipe and poly- sound pipe.Wherein, equal pipe is managed for stablizing from convergence
Sound work(is simultaneously transported to poly- sound pipe by the frequency of the sound wave of output.In the present embodiment, the profile of poly- sound pipe, which uses, is conducive to reduction sound work(
What is be lost is linear, such as the profile of poly- sound pipe uses the linear of linear presentation, index or hyperbola variation.Array thermoacoustic occurs
The traveling wave ingredient of each thermoacoustic generator unit output of device is along multichannel convergence pipe 2, equal pipe 9 and gathering with specific line style
Sound pipe 10 is output to open space.The isometrical length of tube is about λ/4, a diameter of Ф 10mm- Ф 150mm,
The initial diameter Ф of the poly- sound pipe 10C0Equal to 9 diameter of equal pipe.The initial cross sectional of poly- sound pipe 10 accumulates AC0,
Tail end section is accumulatedAs ε=0, linear presentation hyperbolic-type variation；As ε=∞,
Linear presentation exponential type variation；As ε=(x0/ h)+i (pi/2) when, the variation of linear presentation pyramid type.The tool of equal pipe and poly- sound pipe
Body design can refer to document：Zhang Hailan, theoretical acoustics, Higher Education Publishing House, 2012.
In the opening (end of i.e. poly- sound pipe) of poly- sound pipe, impedance can be calculated according to described above；Work as equal pipe
Length and sectional area it is known that poly- sound pipe profile use line style and its dimensional parameters it is also known that when, you can be back-calculated to obtain
The impedance of diameter pipe initiating terminal.Since equal pipe is connect with the outlet of multichannel convergence pipe, so the beginning impedance of equal pipe is exactly
Multichannel converges the impedance of the output end of pipe.And it requires to want with volume flow rate continuity according to the continuity of previously described pressure
It asks, you can obtain the output terminal impedance in each channel of the multichannel convergence pipe met the requirements.I.e.：
ZEqual pipe beginningFor the beginning impedance of equal pipe, calculating can refer to described above.Pipe will be also converged sometimes herein
Channel is known as input channel, and the output end after convergence is known as delivery outlet.
In the output end impedance Z for obtaining each channelxoAfterwards, it can further be obtained according to the relational expression at beginning and terminal impedance
Go out the beginning impedance Z in each channelxi.The beginning impedance in each channel corresponds respectively to the output end of corresponding thermoacoustic generator unit
Impedance, that is to say, that when designing each thermoacoustic generator unit, lead to equal to the calculated correspondence of institute as long as it exports terminal impedance
The beginning impedance in road, you can meet the requirements, and then the wave crest for making whole system form pressure wave is superimposed with wave crest, trough and trough
The effect of superposition, and then realize that the sound intensity is pressed into the increased communication effect of multiple.
Certainly, in specific implementation, each thermoacoustic generator unit can also be first designed, and by emulating or surveying
To the output terminal impedance of the thermoacoustic generator unit, the caliber and length in each channel of pipe are then converged by adjusting multichannel again
Degree, to obtain the output terminal impedance in the required channel.This reduces the assembly and design of each thermoacoustic generator unit
Difficulty.Even if there are deviations for the reality output terminal impedance of thermoacoustic generator unit and design object, can also be by adjusting mostly logical
Road converges caliber and the length in each channel of pipe to obtain the output terminal impedance at required convergence, and then forms pressure wave
Wave crest is superimposed with wave crest, the effect that trough is superimposed with trough.
The mode that thread seal may be used between each thermoacoustic generator unit of the present embodiment and multichannel convergence pipe connects
It connects, naturally it is also possible to use other sealed connection modes.Spiral shell can also be used between multichannel convergence pipe and open type resonatron
The mode of line sealing connects, naturally it is also possible to use other sealed connection modes.
In theory, the sound work(of the array thermoacoustic generator output based on two identical thermoacoustic generator units can reach
Twice of single thermoacoustic generator unit.But the array thermoacoustic generator of practical set be often difficult to accurately attain allow it is each
The output wave crest of thermoacoustic generator unit is superimposed with wave crest, the effect that trough is superimposed with trough, so loss is difficult to avoid that.
As long as the phase difference of the acoustic pressure of (output end in i.e. each channel) is less than 90 degree at the convergence in each channel, you can realize enhancing sound
The effect of work(.And caliber and section are designed based on the formula of impedance in each channel above, each channel can be inhibited well
Output end phase difference, to significantly increase array thermoacoustic generator output sound work(.
Based on above-mentioned principle, the array thermoacoustic generator of other structures can be devised by.For example, Fig. 3 shows this
There are three the open-type thermoacoustic generator array of the Triangle-Profile of thermoacoustic generator unit dresses for tool in invention one embodiment
The Section A-A figure set (is not drawn into the front view of the array thermoacoustic generator of the embodiment, Section A-A here is herein
Refer to array thermoacoustic generator perpendicular to equal pipe axis and the section of all thermoacoustic generators cross section, Fig. 4~7 can be intercepted
And in this way, hereafter repeat no more).Fig. 4 shows square of the tool in one embodiment there are four thermoacoustic generator unit
The Section A-A figure of the open-type thermoacoustic generator array apparatus of distribution.Fig. 5 shows the tool in one embodiment, and there are five thermoacoustics
The Section A-A figure of the open-type thermoacoustic generator array apparatus of the equal pentagons distribution of generator unit.Fig. 6 shows a reality
Applying tool in example, there are six A-A sections of the open-type thermoacoustic generator array apparatus of the equal hexagons distribution of thermoacoustic generator unit
Face figure.The design principle of the embodiment of these deformations and the one embodiment being described above are completely the same, therefore repeat no more.
Fig. 7 shows the Section A-A of the thermoacoustic generator unit array of the distribution of the matrix form in one embodiment of the invention.
The design principle of the embodiment and the one embodiment being described above are completely the same, repeat no more.
In conclusion the present invention radiates the insufficient defect of the sound intensity for single open-type thermoacoustic generator, by multiple independences
Open-type thermoacoustic generator unit be combined by different structure designs, form pressure wave in certain transmission range
Wave crest be superimposed with wave crest, the effect that trough is superimposed with trough, so realize the increased communication effect of sound intensity multiple.
Finally, it should be noted that above example is only to illustrate the present invention, and it is unrestricted.Although with reference to embodiment pair
The present invention is described in detail, it will be understood by those of ordinary skill in the art that, it modifies to technical scheme of the present invention
Or equivalent replacement should all cover the claim in the present invention without departure from the spirit and scope of technical scheme of the present invention
In range.
Claims (9)
1. a kind of array thermoacoustic generator, including at least two thermoacoustic generator units；With at least two input channels and
The convergence pipe of one delivery outlet；And open type resonatron；
Wherein, an input channel of each thermoacoustic generator unit connection convergence pipe, each input channel of the convergence pipe
Output end cross, and the delivery outlet is set in intersection, the delivery outlet is connect with the open type resonatron, Ge Gesuo
Output terminal impedance, the length of each input channel and the value of caliber for stating thermoacoustic generator unit enable to convergence to manage
Intersection formed wave crest be superimposed with wave crest, the effect that trough is superimposed with trough.
2. array thermoacoustic generator according to claim 1, which is characterized in that the friendship of the input channel of the convergence pipe
The phase difference of acoustic pressure at remittance is less than 90 degree.
3. array thermoacoustic generator according to claim 2, which is characterized in that each thermoacoustic generator unit
Output terminal impedance, the length of each input channel and the value of caliber enable to the intersection of convergence pipe while meeting pressure
The continuity of power requires and the requirement of volume flow rate continuity.
4. array thermoacoustic generator according to claim 3, which is characterized in that each thermoacoustic generator unit
Output terminal impedance, the length of each input channel and the value of caliber enable to：
ZEqual pipe beginningFor the beginning impedance of equal pipe, it is by calculating the length of poly- sound pipe opening impedance and equal pipe and cutting
The profile of area and poly- sound pipe use line style and its sizecalculation obtain, ZxoIt is hindered for the terminal of xth input channel
It is anti-, x=1,2 ..., N, N be the number of the input channel of convergence pipe.
5. array thermoacoustic generator according to claim 4, which is characterized in that for any one input channel x,
Beginning impedance ZxiIt calculates according to the following formula：
Wherein ZxoFor the terminal impedance of xth input channel, ZxCFor the acoustic characteristic impedance of xth input channel,ρ is sky
Air tightness, a are the velocity of sound, lxFor the length of input channel x, ω is the working frequency of corresponding thermoacoustic generator unit.
For the thermoacoustic generator unit being connect with xth input channel, the structure and design of the thermoacoustic generator unit are joined
Output terminal impedance when number enables to the thermoacoustic generator unit to work independently is equal or close to the calculated xth input of institute
The sending-end impedance in channel.
6. array thermoacoustic generator according to claim 4, which is characterized in that poly- sound pipe opening impedance is based on opening
Locate radius, system operating frequency, the radiation impedance according to circular piston on infinitely great baffle calculates.
7. array thermoacoustic generator according to claim 4, which is characterized in that the thermoacoustic generator unit with it is mostly logical
It is connected by the way of thread seal between the input channel of road convergence pipe, multichannel converges the delivery outlet and open type resonance of pipe
It is also connected by the way of thread seal between pipe.
8. array thermoacoustic generator according to claim 1, which is characterized in that each thermoacoustic generator unit at etc. it is polygon
The mode of shape is arranged.
9. array thermoacoustic generator according to claim 1, which is characterized in that the thermoacoustic generator unit is at array
Mode is arranged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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