CN1955460A - Multi-way sound power output method of thermoacoustic engine - Google Patents

Multi-way sound power output method of thermoacoustic engine Download PDF

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CN1955460A
CN1955460A CNA2006100536315A CN200610053631A CN1955460A CN 1955460 A CN1955460 A CN 1955460A CN A2006100536315 A CNA2006100536315 A CN A2006100536315A CN 200610053631 A CN200610053631 A CN 200610053631A CN 1955460 A CN1955460 A CN 1955460A
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sound
thermoacoustic engine
output
merit
sound merit
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CN100398816C (en
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孙大明
邱利民
王波
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Zhejiang University ZJU
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/14—Compression machines, plants or systems characterised by the cycle used 
    • F25B2309/1402—Pulse-tube cycles with acoustic driver
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle

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Abstract

A multi-channel acoustic work output method for thermo-acoustic engine features that different acoustic works are output from the different positions of a thermo-acoustic engine to different loads for higher efficiency.

Description

Multi-way sound power output method of thermoacoustic engine
Technical field
The present invention relates to the output intent of thermoacoustic engine sound merit, relate in particular to a kind of multi-way sound power output method of thermoacoustic engine.
Background technique
Thermoacoustic effect is the phenomenon of changing mutually between heat and the sound, i.e. time equal thermomechanical effect in the sound field.The hot machine of heat sound is a kind of device by mutual conversion or transmission between thermoacoustic effect realization heat energy and the acoustic energy in essence.The hot machine of heat sound does not need outside mechanical means just can make between the speed of oscillating fluid and the pressure to set up rational phase relationship, therefore, do not need mechanical transmission component, simplified the structure of system greatly.By transformation of energy direction difference, thermoacoustic effect can be divided into two classes: the one, produce sound with heat, and the sound oscillation that instant heating drives is the working mechanism of thermoacoustic engine; The 2nd, produce heat with sound, promptly sound-driving heat delivered is the working principle of hot sound refrigerating machine.As long as possess certain condition, thermoacoustic effect is expert at and can both be taken place in the sound field of wave sound field, standing-wave sound field and both combinations.
According to the sound field characteristic difference, thermoacoustic engine mainly is divided into three kinds of patterns of the capable ripple hybrid type of stationary mode, travelling-wave type and standing wave.Row wave sound field medium velocity ripple is identical with the pressure surge phase place, and the two differs 90 ° in standing-wave sound field.The standing wave thermoacoustic engine is generally straight line type and arranges that all parts all on an axis.Because the phase difference between stationary field medium velocity and the pressure is 90 °, when the folded place of plate gas velocity is in the forward maximum, gas moves to the hot junction limit in the folded passage high speed of plate, skim over the most displacements (promptly skimming over most temperature gradient) in the motion of forward half period, therefore, this process should be to heat the strongest time period.But this moment is also just the variation in pressure maximum time, gas was compressed rapidly in this period, compression process and heating process take place simultaneously, from thermodynamic (al) angle see both be unfavorable for the compression also be unfavorable for the heating, therefore cause the hysteresis of conducting heat between gas and the solid, this thermal hysteresis makes has had the suitable temperature difference between the gas and solid dielectric when gas motion slows down the absorption heat, thereby causes very big irreversible loss.But we also should see, if there is not thermal hysteresis, standing-wave sound field in theory can not generation sound merit, and it is that cost produces merit to reduce thermodynamic efficiency; In like manner, when the gas experiences expansion process, but experience gas simultaneously at a high speed to the cooling procedure of low-temperature end motion, such process both had been unfavorable for expanding and also had been unfavorable for heat release.Therefore, just must adopt the bigger plate of spacing folded in order to realize that in stationary field hot merit transforms to form thermal hysteresis, part heating is occurred in after the compression process, part cooling occurs in after the inflation process, yet gas reduces the efficient of whole device with the irreversible thermal procession that the finite temperature differential thermal transmission between solid causes greatly.
The void size of regenerator matrix has realized the desirable thermo-contact between solid and gas much smaller than the gas heat penetration in the traveling wave thermoacoustic engine, and heating and cooling are approximately reversible isothermal process.Simultaneously, go wave sound field medium velocity and pressure cophasing.At traveling wave thermoacoustic engine regenerator place, when gas is compressed rapidly, gas motion speed is very little, strides across temperature increment less on the regenerator, therefore can efficiently be compressed, and in heating process, gas has maximum forward direction speed, strides across maximum temperature increase interval, and this moment, pressure changed very little, therefore can realize the inflation process of absorbing heat efficiently, this is undoubtedly highly beneficial to the conversion of sound merit to heat energy from the thermomechanics angle; In like manner, after gas enters the pressure reduction stage, gas motion speed is less, skim over the less temperature range of thermal acoustic regenerator, the reduction of the pressure that is beneficial to, speed becomes big when gas pressure drops to a certain degree, and temperature variation is rapid, gas is to the regenerator heat release, and gas experiences the heat release again of expanding earlier.Heat sound transfer process in the as seen from the above analysis capable wave sound field is carried out naturally, do not have the participation of irreversible process, and very little regenerator water conservancy radius can guarantee the isothermal heat transfer of gas and regenerator.Therefore, be backheating sound transfer process but traveling wave thermoacoustic engine carries out in theory, can obtain the thermodynamic efficiency higher than standing wave thermoacoustic engine.Because the distribution of impedance in the pure traveling wave thermoacoustic engine sound field is even, can cause huge viscous dissipation at the regenerator place, therefore the heat sound machine that can obtain higher thermal sound conversion efficiency at present generally is a row ripple standing wave hybrid type thermoacoustic engine, it structurally comprises a capable ripple loop and a resonance straight-path, combine the common advantage of pure standing wave and traveling wave thermoacoustic engine, the hot merit conversion efficiency can compare favourably with internal-combustion engine.If do not do special differentiation, generally also the hybrid type thermoacoustic engine is called traveling wave thermoacoustic engine, and pure loop traveling wave thermoacoustic engine is called pure traveling wave thermoacoustic engine, concrete structure can be referring to accompanying drawing.
Thermoacoustic engine is to utilize thermoacoustic effect, thereby heat energy is converted into the sound generator of acoustic energy realization sound merit output, it does not have mechanical moving element fully, has the reliability of height, is the desirable driving source of the mobile refrigerator of alternations such as vascular refrigerator, hot sound refrigerating machine.Secondly, the used working medium of thermoacoustic engine (as nitrogen, helium etc.) is an environmental friendliness gas, has adapted to the trend of environmental protection.In addition, the hot machine of heat sound can directly adopt low grade heat energy (as solar energy, industrial waste heat etc.) to drive, not only help improving the thermodynamic efficiency of system, and occasion abundant for heat energy but that electric energy lacks has more practical significance, separates with oil field gas as the natural gas liquefaction of offshore drilling platform or landlocked outlying district oil gas field etc.Therefore, be one of the focus in international energy power field about the research of the hot machine of heat sound in recent years always.
Pressure ratio is one of important parameter of estimating thermoacoustic engine, and it is defined as the ratio of maximum value with the minimum value of surge pressure, and it has determined the grade of thermoacoustic engine output sound merit.Theoretical and experiment all shows, the thermoacoustic engine pressure ratio is big more then to help driving vascular refrigerator or other hot sound refrigerating machine obtains lower cryogenic temperature and bigger refrigerating capacity more.Usually high-frequency vascular refrigerator is in order to obtain the pressure ratio of low temperature needs more than 1.20 below the 70K.At present, in the world in the pressure ratio of grinding traveling wave thermoacoustic engine about 1.2, the maximal pressure ratio can reach 1.31.
Summary of the invention
The purpose of this invention is to provide a kind of multi-way sound power output method of thermoacoustic engine.Thereby obtain more merit output, improve the thermoacoustic engine thermal efficiency and  efficient.
It is on same the thermoacoustic engine simultaneously from the position output sound merit more than 2 or 2 places, be used to drive load.
Described thermoacoustic engine is traveling wave thermoacoustic engine, standing wave thermoacoustic engine or row ripple standing wave hybrid type thermoacoustic engine.Described load is acoustics load, vascular refrigerator, hot sound refrigerating machine, generator or the piston force driving mechanism as pure sound merit output unit.
Beneficial effect of the present invention:
As previously mentioned, thermoacoustic engine is different with general mechanical commprssor, and the space scale that its sound field distributes is big, is generally 1/4～1/2 of sound wave length, and size is in the scope of 1m～10m.In addition, the charging amount of thermoacoustic engine gas working dielectric is big.Therefore, this has just caused certain difficulty for the concentrated output of thermoacoustic engine sound merit.From other angle, this also can become the exclusive advantage of thermoacoustic engine.On the one hand, thermoacoustic engine can be in the pressure oscillation intensity region of a broad provides merit in for load, can satisfy the unequally loaded requirement simultaneously; On the other hand, in conjunction with the big characteristics of its working gas charging amount, it can drive a plurality of loaded work pieces simultaneously, becomes the common Power Component of a plurality of loads.What is more important, the present invention discovers, and when thermoacoustic engine during simultaneously to a plurality of load output sound merit, the internal loss proportion reduces greatly, and the thermal efficiency and  efficient obtain bigger raising.This also is a purpose of the present invention.
The present invention proposes diverse location from same thermoacoustic engine simultaneously to load output sound merit, is called the multichannel sound merit output method of thermoacoustic engine.This method can increase substantially the sound work output of thermoacoustic engine on the one hand, improves its efficient; Simultaneously, also provide reference for the cascade utilization of thermoacoustic engine energy.It is multistage to this means that thermoacoustic engine can drive simultaneously, even a plurality of hot sound refrigerating machine, and these refrigerators work in different potential temperatures, can satisfy different needs simultaneously.Experimental result shows, with nitrogen is working medium, working pressure is 2.4MPa, be stabilized in thermoacoustic engine loop acoustic capacitance place pressure ratio under 1.20 the situation, from loop acoustic capacitance and resonatron output sound merit simultaneously, obtained the most loud merit, 11.3% the most loud merit heat outputting efficient of 389.95W and 16.0% the most loud merit output  efficient, this has improved 51.4%, 24.6% and 19.4% respectively than the most loud merit and the efficient from loop output separately.And simultaneously output sound merit with compare from loop output sound merit separately, change not quite from the sound merit of loop acoustic capacitance output.
Description of drawings
Fig. 1 traveling wave thermoacoustic engine structure harmony merit outgoing position schematic representation;
Fig. 2 different volumes air reservoir is at the diverse location comparison diagram of output sound merit separately;
Fig. 3 sound merit of output sound merit and two air reservoir output sound merits separately exports comparison diagram;
Fig. 4 is output sound merit and the two-way thermal efficiency comparison diagram during output sound merit simultaneously separately;
The Changing Pattern figure of heating power during Fig. 5 thermoacoustic engine output sound merit;
Fig. 6 is the  efficient comparison diagram of output sound merit and two air reservoir output sound merits separately;
The multichannel sound merit output schematic representation of Fig. 7 standing wave thermoacoustic engine;
The multichannel sound merit output schematic representation of the pure loop traveling wave thermoacoustic engine of Fig. 8;
The multichannel sound merit output schematic representation of Fig. 9 plural serial stage tandem type thermoacoustic engine;
The multichannel sound merit output schematic representation of Figure 10 coaxial type thermoacoustic engine.
Embodiment
The thermoacoustic engine internal acoustic field is the basis of merit output, also means the increase of loosing of sound power consumption in resonatron and other parts in order to keep high pressure ratio in the motor, adds the corresponding increase of heat, thereby has reduced the thermal efficiency of thermoacoustic engine.Simultaneously, the sound field that thermoacoustic engine has in a big way usually distributes, and the sound merit is difficult to concentrate output, for further improving the sound merit output capability of thermoacoustic engine, realizes the cascade utilization of energy, and thermoacoustic engine sound merit Study on output characteristic just seems particularly important.For this reason, the present invention proposes multichannel sound merit output scheme and its validity carried out experimental verification.The multi-way sound power output method of thermoacoustic engine that the present invention of test result proof proposes can effectively increase the sound work output of thermoacoustic engine, and improves its thermal efficiency and  efficient greatly.
The multichannel sound merit output method that the present invention is directed on a kind of traveling wave thermoacoustic engine provides detailed technical order and process of the test, and only being provided schematic representation, the output of the multichannel on other pattern thermoacoustic engine method describes, their working principle is identical, here repeats no more.In addition, the multichannel sound merit output method that the present invention proposes not only is confined to the situation that a motor drives two loads simultaneously, and a motor can drive countless a plurality of little loads simultaneously in theory, thereby reaches its highest heat sound transformation efficiency.Here, be that example compares verification experimental verification only with two R-C loads of engine-driving.
Fig. 1 has provided the structure diagram of traveling wave thermoacoustic engine, has arranged 4 pressure-measuring-points on it, is respectively p1, p2, p3 and p4.Two on-positions of sound merit measuring device are respectively on the feedback loop of loop and near the resonatron place of threeway.Two valves all adopt the needle-valve that Swagelok company produces in the device, and its peak rate of flow coefficient Cv is that 0.73 (the valve model is SS-1RS10MM, SS-1RS12MM).Measurement by to valve thermoacoustic engine side and the fluctuation of air reservoir internal pressure utilizes formula (1) (2) to obtain merit output value.In order to guarantee that the gas rerum natura by valve is even in the measuring phase, on connecting tube, arranged cooling water pipeline, pipeline and valve are cooled off.
U = iω Vp T γp m - - - ( 1 )
In the formula, i is an imaginary unit, and γ is specific heat at constant pressure and the ratio of deciding specific volume specific heat, ω, p mBe respectively the angular frequency and the gas middle pressure of system.The sound merit of consumption on valve can be expressed as:
E load = ωV | p T | | p E | sin θ 2 γ p m - - - ( 2 )
In the formula, | p E| be the pressure amplitude of thermoacoustic engine at sound merit equipped at outlet port, θ is p EAnd p TThe phase difference of place's pressure surge.Obviously, the sound merit E that consumes on the valve LoadBe exactly the sound merit of thermoacoustic engine to load output.Therefore, the sound merit of exporting from thermoacoustic engine can obtain by the accurate measurement to pressure amplitude and phase place.
We are with N in the experiment 2Be working medium, working pressure is 2.4MPa, for guaranteeing the pressure ratio grade of loop output sound merit, in the process of output sound merit, make motor loop acoustic capacitance place (being the P1 place among Fig. 1) pressure ratio be stabilized in 1.20 by regulating electrical heating power, two positions of output sound merit are respectively at loop acoustic capacitance place and resonatron place always.In the experiment near the air reservoir the air reservoir at loop acoustic capacitance place and the resonatron threeway is called first air reservoir and second air reservoir.We successively adopt two kinds of experimental programs, and at first carrying out first air reservoir is 500ml, and second air reservoir is the experiment of 750ml, and the convenience in order to explain later on calls experimental program 1 to it; Subsequently the position of two air reservoirs is exchanged and experimentized, promptly first air reservoir is 750ml, and second air reservoir is 500ml, is referred to as experimental program 2.
Sound merit output during the output of thermoacoustic engine single channel
Traveling wave thermoacoustic engine of the present invention is a thermoacoustic engine with 1/4 wavelength mode work, as shown in Figure 1, it is maximum that the pressure ratio of this motor reaches above primary cooler, reduce gradually to resonant cavity along loop left side branch road counterclockwise, the output pressure ratio harmony work output difference that obtains during therefore, from thermoacoustic engine diverse location output sound merit.Fig. 2 is stabilized in 2.4MPa in working pressure, and 500ml and 750ml air reservoir were respectively in the output sound merit contrast at acoustic capacitance place and resonatron place when motor acoustic capacitance place (P1) pressure ratio was stabilized in single channel output sound merit under 1.20 the situation.Among the figure as seen, following merit output value of different situations is identical with the variation tendency of valve opening, and all the increase with valve opening increases, be increased to from 7 circles 8 when circle sound merit value increase the fastest, this is that flow resistance subtracts suddenly because the valve flow coefficient increases rapidly in this aperture scope.As can also be seen from Figure, separately during output sound merit, for same load, the sound merit numerical value of exporting on the resonatron is little than the acoustic capacitance place, this is because the pressure ratio at resonatron place (is tested intermediate ring road P1 place pressure ratio and is stabilized at 1.20 o'clock than the acoustic capacitance place is little, the P3 of resonatron place pressure ratio is about 1.135), make that output sound merit is less.In experimental program 1, separately from loop acoustic capacitance output sound merit, when valve opening be 9 whens circle maximum output sound merit be 239.38W, and during separately from resonatron air reservoir output sound merit, maximum output sound merit is 125.19W when valve opening is 9 circles; In experimental program 2, separately from loop acoustic capacitance air reservoir output sound merit, when valve opening be 9 whens circle the most loud merit be output as 257.61W, and during separately from the air reservoir output sound merit of resonatron, the most loud merit is output as 124.69W when valve opening is 9 circles.Test result shows, separately during output sound merit, and same load, size and the grade of exporting merit in different positions are different.The air reservoir of 500ml can be in the low-grade sound merit (pressure ratio is 1.135) of resonatron place output 124.69W, and can export the high-grade sound merit (pressure ratio is 1.20) of 239.38W at the acoustic capacitance place, list in quantity, exported 47.91% sound merit more, found that as calculated the thermal efficiency and  efficient also all have the raising of big level.With respect to the output capability of present thermoacoustic engine, long-pending its state that reaches the output of complete sound merit that all far can not make of the gentle storage capacity of the flow coefficient of used valve is so two air reservoirs are very approaching at the sound merit output rule of same position.
Sound merit output during the output of thermoacoustic engine multichannel, the thermal efficiency and  efficient
Be easy-to-operat, also the rule of multichannel sound merit output can be said clearly simultaneously that we adopt two-way (first air reservoir and the second air reservoir) experimental program of output sound merit simultaneously in experiment.Find in the experiment, the sound merit numerical value of acoustic capacitance place output and efficient are all than big on the resonatron, and be subjected to the influence of valve opening also bigger, for obtaining the two-way rule of output sound merit simultaneously, we are under the situation of resonatron place air reservoir early gate standard-sized sheet, open gradually near the valve before the acoustic capacitance place air reservoir, and guarantee that acoustic capacitance place pressure ratio is stabilized in 1.20.
As seen from Figure 3, keeping acoustic capacitance place pressure ratio is 1.20, with the sound merit output at acoustic capacitance place as the investigation object, independent output sound merit and two-way simultaneously during output sound merit the sound merit curve of output at the acoustic capacitance place overlap substantially.Simultaneously during output sound merit, on the quantity of output sound merit, the output of resonatron place low-grade sound merit is to the not influence of output of acoustic capacitance place high-grade sound merit at two-way for this explanation motor.This also shows, to load on the main factor that influences sound merit output size on the same position be pressure ratio for same, and the influence of other factors is less.From figure obviously as seen, two-way is simultaneously during output sound merit, total output sound merit increase with the increase of acoustic capacitance place air reservoir valve opening, and under identical valve opening, owing to increased the sound merit output at resonatron place, total sound merit ratio significantly increases from the sound merit of acoustic capacitance output separately.The output of sound merit all reaches maximum separately and during two-way output sound merit in experimental program 2, when load valve opening in acoustic capacitance place is 9 circles, the maximum output sound merit that two-way is exported simultaneously is 389.95W, and this has improved 51.4% than the most loud merit 257.61W that exports from acoustic capacitance separately.
Fig. 4 is that the thermal efficiency ratio during output sound merit is simultaneously for independent output sound merit and two-way.As seen, under identical valve opening, the thermal efficiency of two-way when the thermal efficiency ratio during output sound merit is separately from acoustic capacitance output sound merit simultaneously is much higher among the figure.When valve opening was 8.5 whens circle, the maximum thermal efficiency of acquisition is 11.3% (experimental program 1), and this peak efficiency value 9.0% than separately from acoustic capacitance output sound merit the time has improved 24.6%.
In sound merit output procedure, because keeping thermoacoustic engine is 1.20 near the pressure ratio at loop acoustic capacitance place, sound field in the whole thermoacoustic engine distributes and remains unchanged substantially, so adding heat and heating power is constantly changing, heating-up temperature raises with the increase of sound work output is dull, and the heating power change curve as shown in Figure 5.Thermoacoustic engine is the hot machine that drives with heat energy, with the variation of heating-up temperature, equivalent add the contained available energy difference that has of heat, so be necessary to carry out the validity that the  efficiency analysis improves thermoacoustic engine efficient with further checking multichannel sound merit output method.Fig. 6 is under the different sound merit way of outputs, the  efficient correlation curve of thermoacoustic engine, among the figure as seen, enlarging markedly when the  efficient when sound merit two-way is exported simultaneously compares separately from acoustic capacitance output sound merit, maximum  efficient during single channel output sound merit is 13.4%, and  efficient reaches 16.0% during two-way output sound merit, has improved 19.4%.
From above experimental result as can be seen, thermoacoustic engine is different with the compressor of other mechanical patterns, it be a kind of can multichannel, the hot machine of step output sound merit.When adopting multichannel sound merit output scheme, low-grade merit output of thermoacoustic engine is very little to the size influence of high-grade sound merit output, and total output sound merit, the thermal efficiency and  efficient all greatly improve.This shows acoustic energy more than needed in thermoacoustic engine, adopt the way of multichannel output, can obtain more sound merit, the bigger thermal efficiency and  efficient.
Fig. 7 is the multichannel sound merit output schematic representation of standing wave thermoacoustic engine, and the standing wave thermoacoustic engine relies on the thermoacoustic effect in the standing-wave sound field to carry out work, at the primary cooler place of thermoacoustic engine reaches maximum pressure ratio usually, and draw merit at this place.Merit output is carried out in the acoustics load that other can be set on resonatron as shown in the figure simultaneously, improves its efficient;
Fig. 8 is the multichannel sound merit output schematic representation of pure loop traveling wave thermoacoustic engine, can carry out merit output in loop on a plurality of positions simultaneously;
Fig. 9 is the multichannel sound merit output schematic representation of plural serial stage tandem type thermoacoustic engine, and the plural serial stage tandem type thermoacoustic engine has been realized the combination of standing wave and row wave sound field on the straight line type topological structure, and essence is row ripple standing wave hybrid type thermoacoustic engine.This pattern makes the structure of this type thermoacoustic engine obtain simplifying, and also is a kind of promising heat sound machine.Merit delivery outlet can be set in a plurality of positions as shown in drawings simultaneously;
Figure 10 is the multichannel sound merit output schematic representation of coaxial type thermoacoustic engine, its working procedure is similar to aforesaid traveling wave thermoacoustic engine, be a capable ripple standing wave hybrid type thermoacoustic engine in essence, can on its axial a plurality of positions, merit delivery outlet be set simultaneously as shown in drawings.

Claims (3)

1. a multi-way sound power output method of thermoacoustic engine is characterized in that, on same the thermoacoustic engine simultaneously from the position output sound merit more than 2 or 2 places, be used to drive load.
2. a kind of multi-way sound power output method of thermoacoustic engine according to claim 1 is characterized in that: described thermoacoustic engine is traveling wave thermoacoustic engine, standing wave thermoacoustic engine or row ripple standing wave hybrid type thermoacoustic engine.
3. a kind of heat sound according to claim 1 starts multichannel sound merit output method, it is characterized in that: described load is acoustics load, vascular refrigerator, hot sound refrigerating machine, generator or the piston force driving mechanism as pure sound merit output unit.
CNB2006100536315A 2006-09-27 2006-09-27 Multi-way sound power output method of thermoacoustic engine Expired - Fee Related CN100398816C (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011149670A (en) * 2010-01-25 2011-08-04 Isuzu Motors Ltd Thermoacoustic engine
CN101754080B (en) * 2008-12-05 2013-04-24 清华大学 Sound-generating device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647216A (en) * 1995-07-31 1997-07-15 The United States Of America As Represented By The Secretary Of The Navy High-power thermoacoustic refrigerator
JP4048821B2 (en) * 2002-04-26 2008-02-20 株式会社デンソー Thermoacoustic generator
JP4035069B2 (en) * 2003-02-27 2008-01-16 財団法人名古屋産業科学研究所 Piping equipment equipped with a sound amplifying / attenuator using thermoacoustic effect
JP2005253240A (en) * 2004-03-05 2005-09-15 Denso Corp Thermoacoustic power generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101754080B (en) * 2008-12-05 2013-04-24 清华大学 Sound-generating device
JP2011149670A (en) * 2010-01-25 2011-08-04 Isuzu Motors Ltd Thermoacoustic engine

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