CN100402844C - Double-feedback-loop mixing type traveling wave thermoacoustic engine with bypass structure - Google Patents
Double-feedback-loop mixing type traveling wave thermoacoustic engine with bypass structure Download PDFInfo
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- CN100402844C CN100402844C CNB2006100816655A CN200610081665A CN100402844C CN 100402844 C CN100402844 C CN 100402844C CN B2006100816655 A CNB2006100816655 A CN B2006100816655A CN 200610081665 A CN200610081665 A CN 200610081665A CN 100402844 C CN100402844 C CN 100402844C
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Abstract
The present invention discloses a double feedback loop mixed type traveling wave heat sound engine with a bypass structure, which comprises a feedback pipeline, a sound capacitance pipeline, a jet pump, a main cooler, a heat sound heat regenerator, a heater, a heat buffer pipe, an auxiliary cooler, a resonant straight circuit and a silencing part, wherein the feedback pipeline, the sound capacitance pipeline, the jet pump, the main cooler, the heat sound heat regenerator, the heater, the heat buffer pipe, the auxiliary cooler, the resonant straight circuit and the silencing part are orderly connected, and a second feedback pipeline is connected to inlets of the sound capacitance pipeline and the resonant straight circuit. In order to reduce sound power loss in a traveling wave loop and effectively suppress direct current in the loop, the present invention provides that double feedback loops provided with a bypass structure are used on the mixed traveling wave heat sound engine, which is structural innovation to the mixed traveling wave heat sound engine. The present invention can effectively suppress the direct current on the traveling wave loop, reduces non-reversible loss in the heat regenerator and the jet pump, and therefore, improves the performance of the heat sound engine.
Description
Technical field
The present invention relates to a kind of double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure, by-pass structure can improve the performance of thermoacoustic engine.
Background technique
Thermoacoustic engine is to utilize thermoacoustic effect, realizes the sound generator of heat energy to acoustic energy conversion and the output of realization sound merit.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.Because standing-wave sound field medium velocity ripple and pressure wave phase difference are 90 °, do not have the transmission of merit in the stationary field in theory; On the other hand, in standing wave thermoacoustic engine plate is folded gas with solid between heat exchange relatively poor, what gas carried out is that irreversible thermodynamics circulate, so thermoacoustic engine efficient is low.The utilization of travelling-wave type thermoacoustic engine be row wave sound field, the fluctuation of sound field medium velocity is identical with the pressure surge phase place, and the hydraulic radius of gas channel is much smaller than the gas heat penetration in the motor regenerator, gas carries out in regenerator warm transmission such as is, so traveling wave thermoacoustic engine can reach the thermodynamic efficiency higher than standing wave thermoacoustic engine in theory.But utilize pure capable wave sound field also be difficult to realize higher heat sound transformation efficiency, main cause has: 1) always there is thermal hysteresis when heat is transmitted mutually between the gas medium inevitably in solid dielectric in the regenerator; 2) going the wave sound field has the low acoustic impedance characteristic, and this can cause big viscosity loss, particularly at the regenerator place; 3) there are various forms of loop direct currents.The standing wave forthright is introduced in appropriate location at loop, constitute mixing type traveling wave thermoacoustic engine, the thermal hysteresis that can utilize on the one hand solid dielectric in the regenerator to exist when heat is transmitted mutually between the gas medium realizes the conversion of standing wave heat sound, thus can improve on the other hand capable wave sound field particularly the acoustic impedance at regenerator place reduce viscous loss.U.S. Los Alamos National Laboratory has made a travelling-wave type thermoacoustic engine, draw a standing wave forthright by the ripple loop of being expert at, successfully in sound field, introduce the standing wave composition, and in experiment, obtained 42% relative Carnot efficiency and 30% thermodynamic efficiency.As shown in Figure 1, mixing type traveling wave thermoacoustic engine has following constituent element usually:
One, goes the ripple loop
1. primary cooler, primary cooler is positioned at the top of regenerator 2, and its effect is to take away heat, cooled gas working medium at the regenerator indoor temperature end, to set up the temperature gradient on the thermal acoustic regenerator;
2. thermal acoustic regenerator is positioned at primary cooler 1 below, and thermal acoustic regenerator is the key member that produces and strengthen thermoacoustic effect, and the thermoacoustic effect of Fa Shenging produces merit or strengthens herein;
3. heater, the effect of heater are that the other end at the relative cooler of regenerator provides a high temperature heat source, form a temperature gradient with the ambient temperature at cooler place on regenerator.This temperature gradient is the power of thermoacoustic engine work;
4. thermal buffer channel, thermal buffer channel are between heater 3 and supplementary cooler 5, and effect is to realize that the heater and the heat of supplementary cooler isolates, and to reduce the leakage heat of hot end heat exchanger to supplementary cooler, makes the sound merit from the outwards transmission of engine high-temperature zone simultaneously.In order to reduce axial thermal conductivity, tube wall should be thin as far as possible under the situation of requirement of strength satisfying for thermal buffer channel;
5. supplementary cooler and fluid director, the effect of supplementary cooler are the gas temperatures that reduces transmission sound merit, are beneficial to that merit is drawn and provide power for hot sound refrigerating machine.Direct current in loop flows, and (Gedeon flows, promptly pass through the time equal mass flow along loop such as regenerator, thermal buffer channel, feedback pipe) and thermal buffer channel in direct current flow when all being suppressed fully, the load of supplementary cooler only is that diameter is big so supplementary cooler can adopt along the leakage of thermal buffer channel tube wall heat with from the thermal radiation of hot end heat exchanger, length is lacked the Stainless Steel Tube of (being that heat exchange area is less);
Fluid director is positioned at thermal buffer channel below, and effect is to make to enter the thermal buffer channel bottom and the interior air-flow of thermal buffer channel evenly distributes, prevent owing to the shape of supplementary cooler or with the jet that forms that separates of the tie point place air-flow of resonatron.Jet can cause the direct current of gas in the thermal buffer channel to flow, and causes the waste of a large amount of heats of heater.
6. feedback pipe, the effect of feedback pipe are for the row wave component provides path, play the effect of phonoreception parts simultaneously, make the cooler place produce traveling-wave phase;
7. acoustic capacitance channel, acoustic capacitance is a cavity that volume is bigger across loop left and right sides branch road.It is acoustic capacitance parts in essence, realizes traveling-wave phase in cooler end together with the feedback forthright;
8. jet pump, spray body pump is between acoustic capacitance 7 and primary cooler 1, its effect is to utilize the runner asymmetrical effect to produce a pressure difference at two ends, forms a counteracting as far as possible with it of flowing also against loop second order mass flow, thereby suppresses loop Gedeon direct current.
Two, standing wave resonance forthright
9. resonance straight-path, the effect of resonance straight-path are the standing wave pipelines of coupling on the ripple loop of being expert at, and in standing wave composition drawing-in system, make this system have the advantage of standing wave and traveling wave thermoacoustic engine concurrently, thereby have improved the thermodynamic efficiency of thermoacoustic engine; On the other hand, resonance straight-path is drawn most of sound merit and is formed the standing wave phase place at forthright from loop, because standing wave system can realize bigger acoustic impedance, so resonance straight-path provides the optimum position that connects load;
10. muffling part.
Owing to exist capable ripple loop, to consider that therefore direct current suppresses problem in the hybrid type thermoacoustic engine.Adopt the jet pump structure of people such as the Swift promotion of U.S. Los Alamos National Laboratory, suppress effect preferably though can obtain, the loss of sound merit is bigger.And the sound merit in the feedback loop is when all getting back to regenerator, and loss is too big in regenerator.
Summary of the invention
The purpose of this invention is to provide a kind of double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure.
Double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure comprises feedback pipe, acoustic capacitance channel, jet pump, primary cooler, thermal acoustic regenerator, heater, thermal buffer channel, supplementary cooler, resonance straight-path, the muffling part that connects successively, is connected with second feedback pipe at the inlet of acoustic capacitance channel and resonance straight-path.
The present invention proposes to use by-pass structure in order to reduce the sound merit loss in the capable ripple loop on double-feedback-loop mixing type traveling wave thermoacoustic engine.
By-pass structure be from regenerator to feedback pipe connection one or more bypass tube, the Guan Shangke mounted valve is used for regulating the size of bypass sound merit.So a part of feedback sound merit just need not be by jet pump and whole regenerator, thereby can significantly reduce the irreversible loss of merit in regenerator and jet pump in theory, thereby improves the efficient of thermoacoustic engine.
Respectively establish a feedback loop in the both sides of regenerator place branch road, adopt two feedback arrangements.The resonance straight tube can follow row ripple loop in same plane, also can be perpendicular to the plane at row ripple loop place.If adopt the double loop structure of symmetry, acoustic streaming equal and opposite in direction, direction in two feedback loops are opposite, can effectively suppress the generation of direct current, so can remove the jet pump structure of consumption sound merit in the system from, have reduced the irreversible loss of system.And the employing symplex structure, help strengthening the steadiness of capable ripple loop structure.
The present invention is the typical case of by-pass structure, and by-pass structure also can adopt other various ways.For example in loop, connect several pipelines simultaneously between any two branch roads, or the like.On double-feedback-loop mixing type traveling wave thermoacoustic engine, adopt the outstanding advantage of by-pass structure: be to the structural innovation of mixing type traveling wave thermoacoustic engine, can effectively suppress the direct current on the row ripple loop, and reduce irreversible loss in regenerator and the jet pump, thereby improve the performance of thermoacoustic engine.
Description of drawings
Fig. 1 is the mixing type traveling wave thermoacoustic engine structural representation;
Fig. 2 is the mixing type traveling wave thermoacoustic engine structural representation that uses by-pass structure between regenerator and feedback pipe;
Fig. 3 is the hybrid type thermoacoustic engine structural representation that adopts two feedback arrangements.
Embodiment
As shown in Figure 2, mixing type traveling wave thermoacoustic engine with by-pass structure comprises feedback pipe 6, acoustic capacitance channel 7, jet pump 8, primary cooler 1, thermal acoustic regenerator 2, heater 3, thermal buffer channel 4, supplementary cooler 5, resonance straight-path 9, the muffling part 10 that connects successively, establishes by-pass structure between feedback pipe 6 and thermal acoustic regenerator 2.By-pass structure is a bypass tube, is provided with the valve of adjusting sound merit flow size on bypass tube.
As shown in Figure 3, double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure comprises feedback pipe 6, acoustic capacitance channel 7, jet pump 8, primary cooler 1, thermal acoustic regenerator 2, heater 3, thermal buffer channel 4, supplementary cooler 5, resonance straight-path 9, the muffling part 10 that connects successively, is connected with second feedback pipe 11 at the inlet of acoustic capacitance channel 7 and resonance straight-path 9.Be expert at the feedback pipe 6 between the acoustic capacitance channel 7 of the hot acoustic generator of ripple loop structure and resonance straight-path 9 inlets or second feedback pipe 11 or feedback pipe 6 and second feedback pipe 11 established by-pass structure simultaneously and between the thermal acoustic regenerator 2.By-pass structure is a bypass tube, is provided with the valve of adjusting sound merit flow size on bypass tube.
Thermoacoustic engine is assembled the constituent elements of loop and resonance straight-path, loop and resonance straight-path is linked together by flange after finishing the assembling of loop and resonance straight-path respectively, has just realized the assembling of whole system.After finishing the assembling of system, charge into the working gas of certain pressure in system, the water inlet of major and minor cooler and outlet conduit are connected also water flowing, heater begins heating, and system enters working state so, can obtain merit output at the suitable position of system.
Claims (3)
1. double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure, it comprises successively the hot acoustic generator of capable ripple loop structure that the feedback pipe (6), acoustic capacitance channel (7), jet pump (8), primary cooler (1), thermal acoustic regenerator (2), heater (3), thermal buffer channel (4), the supplementary cooler (5) that connect are formed and resonance straight-path (9), muffling part (10), and it is characterized in that: the acoustic capacitance channel (7) of the hot acoustic generator of ripple loop structure of being expert at and the inlet of resonance straight-path (9) are connected with second feedback pipe (11).
2. a kind of double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure according to claim 1 is characterized in that: establish by-pass structure between the feedback pipe (6) between the acoustic capacitance channel (7) of the described hot acoustic generator of ripple loop structure of being expert at and resonance straight-path (9) inlet or second feedback pipe (11) and thermal acoustic regenerator (2).
3. a kind of double-feedback-loop mixing type traveling wave thermoacoustic engine with by-pass structure according to claim 1 and 2, it is characterized in that: at described by-pass structure is bypass tube, is provided with the valve of adjusting sound merit flow size on bypass tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100816655A CN100402844C (en) | 2004-02-26 | 2004-02-26 | Double-feedback-loop mixing type traveling wave thermoacoustic engine with bypass structure |
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| CNB2006100816655A CN100402844C (en) | 2004-02-26 | 2004-02-26 | Double-feedback-loop mixing type traveling wave thermoacoustic engine with bypass structure |
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| CNB2004100166855A Division CN1293303C (en) | 2004-02-26 | 2004-02-26 | Engine of mixing line wave thermal sound with bypass structure |
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| CN1877117A CN1877117A (en) | 2006-12-13 |
| CN100402844C true CN100402844C (en) | 2008-07-16 |
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| CNB2006100816655A Expired - Fee Related CN100402844C (en) | 2004-02-26 | 2004-02-26 | Double-feedback-loop mixing type traveling wave thermoacoustic engine with bypass structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100545449C (en) * | 2007-04-25 | 2009-09-30 | 中国科学院理化技术研究所 | Thermo-acoustic engine system using variable temperature heat source |
| JP5790332B2 (en) * | 2011-08-31 | 2015-10-07 | いすゞ自動車株式会社 | Heat exchanger for thermoacoustic engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137609A (en) * | 1995-06-05 | 1996-12-11 | 中国科学院低温技术实验中心 | Thermoacoustic engine |
| CN1137630A (en) * | 1995-06-05 | 1996-12-11 | 中国科学院低温技术实验中心 | Heat driven thermoacoustic refrigerator without motion component |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137609A (en) * | 1995-06-05 | 1996-12-11 | 中国科学院低温技术实验中心 | Thermoacoustic engine |
| CN1137630A (en) * | 1995-06-05 | 1996-12-11 | 中国科学院低温技术实验中心 | Heat driven thermoacoustic refrigerator without motion component |
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