CN106932481B - Muffler noise reduction characteristic test system - Google Patents
Muffler noise reduction characteristic test system Download PDFInfo
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- CN106932481B CN106932481B CN201710157043.4A CN201710157043A CN106932481B CN 106932481 B CN106932481 B CN 106932481B CN 201710157043 A CN201710157043 A CN 201710157043A CN 106932481 B CN106932481 B CN 106932481B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a silencer silencing characteristic testing system which comprises a testing device, a pressure fluctuation generating system, a pressure fluctuation measuring system and an air system. The testing device comprises an acoustic wave tube; the pressure fluctuation generating system comprises a signal generator, a power amplifier and a loudspeaker; the pressure fluctuation measuring system comprises a pressure fluctuation sensor, a dynamic signal collector, a dynamic signal processor and an analyzer; the silencer to be tested is connected with the sound wave tube, the sound wave tube is connected with the loudspeaker, the loudspeaker is connected with the power amplifier, and the power amplifier is connected with the signal generator; the sound wave tube is connected with at least two pressure fluctuation sensors, the pressure fluctuation sensors are connected to a dynamic signal collector, and the dynamic signal collector is connected with a dynamic signal processing and analyzing device; the sound wave tube is connected with an air system. The test system can study the influence of silencer structure, cold air flow rate and temperature on the sound-eliminating effect, and provides support for developing excellent silencer and solving the problems of combustion oscillation of the combustion engine.
Description
Technical Field
The invention relates to a silencer technology of a combustion chamber, in particular to a silencer silencing characteristic testing system.
Background
Combustion oscillations are an unavoidable problem in low pollution combustion technology for gas turbines, which can produce strong pressure fluctuations, flow and combustion instabilities, causing combustor solid vibrations, leading to thermal cycle fatigue and combustor damage. Thus solving the problem of combustion oscillations is an important task in the development of low pollution combustors. The common methods include active control and passive control. Wherein the passive control increases the dissipation of acoustic energy by adding a muffler, attenuates the intensity of combustion oscillations or avoids the occurrence of combustion oscillations. Because of no rotating part, the performance is reliable, and the method is widely applied in practice. The muffler includes a Helmholtz resonator, a 1/4 wave tube, an acoustic liner, and the like. Helmholtz resonators and 1/4 wavelength tubes are commonly used to absorb narrowband, mid-frequency pressure fluctuations. The acoustic liner can absorb broadband and high-frequency signals, and the structure is compact, so that the acoustic liner is more common in a combustion chamber of a gas turbine. The sound attenuating structures generally include a throat (or porous plate) and a resonant cavity. In the combustion chamber application of a gas turbine, low-temperature air is generally introduced into the cavity, and enters the combustion chamber from the small holes in the throat (or on the perforated plate). This design makes it possible to cool the muffler on the one hand and to improve the sound damping effect of the muffler on the other hand.
The development of a new combustion chamber, the selection of a suitable muffler, is of great importance in eliminating or attenuating the intensity of combustion oscillations. The high-efficiency silencer has requirements on the installation position, the shape and layout of small holes in the throat structure or the porous plate, the low-temperature air flow and the like. It is necessary to study the noise elimination effect by means of a certain test means and improve the structure so as to find the optimal structure and arrangement scheme. Therefore, a test system for testing the silencing effect is designed, and is necessary for the development of a combustion chamber of a gas turbine and other related equipment with silencing requirements.
Disclosure of Invention
The invention provides a silencer silencing characteristic test system, by utilizing the test system, the influence of silencer structure, cold air flow rate, cold air temperature and the like on the silencing effect can be studied, and support is provided for developing excellent silencer and solving the combustion oscillation problem of a combustion engine.
The technical scheme of the invention is as follows:
a muffler sound attenuation characteristic test system is characterized in that: the device comprises a testing device, a pressure fluctuation generating system, a pressure fluctuation measuring system and an air system, wherein the testing device is respectively connected with the pressure fluctuation generating system, the measuring system and the air system;
the testing device comprises an acoustic wave tube; the pressure fluctuation generating system comprises a signal generator, a power amplifier and a loudspeaker; the pressure fluctuation measuring system comprises a pressure fluctuation sensor, a dynamic signal collector, a dynamic signal processor and an analyzer;
the silencer to be tested is connected with the sound wave tube, the end part of the sound wave tube is connected with the loudspeaker, the loudspeaker is connected with the power amplifier, and the power amplifier is connected with the signal generator; the sound wave tube is connected with at least two pressure fluctuation sensors, the pressure fluctuation sensors are connected to a dynamic signal collector, and the dynamic signal collector is connected with a dynamic signal processing and analyzing device; the sonic tube is connected with an air source.
The air system is for providing a source of air. The air system comprises an air source, a flow regulating valve, a flowmeter, a heater, a temperature instrument and the like, wherein the air source is connected to the testing device through a pipeline, and the flow regulating valve, the flowmeter, the heater and the temperature instrument are sequentially installed on the pipeline. The flow of the air source is monitored by a flowmeter, the flow of the air source is controlled by a flow regulating valve, the temperature value of the air source is monitored by a thermometer, and the temperature of the air source is timely regulated by a heater.
The silencer silencing characteristic testing system can be used for measuring the types of the to-be-tested silencer, and comprises a Helmholtz resonator, a 1/4 wave length tube, an acoustic liner and the like.
Depending on the acoustic properties of interest, the muffler to be tested may have different assembly forms, such as:
(1) The testing device can adopt two acoustic wave tubes, the silencer to be tested is fixed between the two acoustic wave tubes, each acoustic wave tube is correspondingly connected with two pressure fluctuation sensors, the end part of one acoustic wave tube is provided with an air outlet, and the end part of the other acoustic wave tube is connected with a loudspeaker; air enters the sound wave tube through the silencer to be tested respectively and exits from the air outlet.
The silencer to be measured is arranged between two acoustic wave tubes, the propagation direction of pressure fluctuation is perpendicular to the axial section of the throat part of the Helmholtz resonator or the 1/4 wave tube or the small hole of the acoustic liner (namely the installation direction of the pressure fluctuation sensor), and the silencer to be measured is used for measuring the sound absorption effect of the silencer to be measured on pressure fluctuation propagated in the tangential direction.
(2) The testing device can also adopt an acoustic wave tube, one end of the acoustic wave tube is provided with an air inlet, and the other end of the acoustic wave tube is provided with an air outlet. The sound wave pipe close to the air inlet is connected with a silencer to be tested, and the silencer to be tested is provided with the air inlet; the other end of the sound wave tube is provided with an air outlet, and the downstream of the air outlet is connected with a loudspeaker.
The silencer to be measured is arranged at one end of the sound wave tube, the propagation direction of pressure fluctuation is parallel to the throat of the Helmholtz resonator or the 1/4 wave tube or the axis of the sound liner small hole, and the silencer to be measured is used for measuring the absorption effect of the silencer to be measured on the pressure fluctuation propagated in the normal direction.
The invention has the following effects and advantages:
(1) The test system comprises a test device, a sound wave generating device, a test system, an air system and the like, and is convenient to test the silencing effect of the silencer through an acoustic treatment method; but also to experimental testing of other acoustic properties.
(2) By changing the installation position of the silencer, the silencing effect of the silencer on different propagation directions can be obtained. The silencer is arranged between the two sound wave tubes, and two pressure fluctuation sensors are respectively arranged on the two sound wave tubes, so that the absorption effect of the sound liner on the tangentially-propagating sound waves can be measured; the sound liner is arranged at one end of the sound wave tube, so that the sound absorption effect of the sound liner on the sound waves propagating normally can be obtained.
(3) The test system is designed with an air system; through governing valve, flowmeter, heater and temperature instrument etc. conveniently adjust air flow and temperature that gets into the experimental part, can study the influence of air inlet temperature to the acoustic cavity. The design can simulate the working environment close to the combustion chamber, and has more guiding significance on engineering.
Drawings
FIG. 1 is a diagram of a tangential acoustic wave absorption effect test system according to the present invention;
fig. 2 is a diagram of a normal sound wave absorption effect test system according to the present invention.
Wherein, the reference numerals are as follows: 1-air source, 2-flow regulating valve, 3-flowmeter, 4-heater, 5-temperature instrument, 6-air inlet, 7-air outlet, 8-muffler to be tested, 9-pressure fluctuation sensor I, 10-pressure fluctuation sensor II, 11-pressure fluctuation sensor III, 12-pressure fluctuation sensor IV, 13-sonic tube I, 14-sonic tube II, 15-loudspeaker, 16-power amplifier, 17-signal generator, 18-dynamic signal collector, 19-dynamic signal processing and analyzer, 20-sonic tube III.
Detailed Description
The test system for the silencing characteristic of the silencer comprises a test device, a pressure fluctuation generation system, a measurement system and an air system, wherein the test device is respectively connected with the pressure fluctuation generation system, the measurement system and the air system.
The testing device comprises an acoustic wave tube; the pressure fluctuation generating system includes a signal generator 17, a power amplifier 16, and a speaker 15; the pressure fluctuation measuring system includes a pressure fluctuation sensor, a dynamic signal collector 18, a processor and an analyzer.
The silencer 8 to be tested is connected with an acoustic wave tube, the end part of the acoustic wave tube is connected with a loudspeaker 15, the loudspeaker 15 is connected with a power amplifier 16, and the power amplifier 16 is connected with a signal generator 17; the sound wave tube is connected with at least two pressure fluctuation sensors, the pressure fluctuation sensors are connected to a dynamic signal collector 18, and the dynamic signal collector 18 is connected with a dynamic signal processing and analyzing device 19; the sonic tube is connected with an air source.
The air system is for providing a source of air. The air system comprises an air source 1, a flow regulating valve 2, a flowmeter 3, a heater 4, a temperature instrument 5 and the like, wherein the air source 1 is connected to a testing device through a pipeline, and the flow regulating valve 2, the flowmeter 3, the heater 4 and the temperature instrument 5 are sequentially installed on the pipeline. The flow of the air source 1 is monitored through a flowmeter 3, the flow of the air source 1 is controlled through a flow regulating valve 2, the temperature value of the air source 1 is monitored through a thermometer, and the temperature of the air source 1 is timely regulated through a heater 4.
The silencer silencing characteristic testing system can be used for measuring the types of the to-be-tested silencer 8, and comprises a Helmholtz resonator, a 1/4 wave length tube, an acoustic liner and the like. Depending on the acoustic properties of interest, the muffler 8 to be tested may have different assembly forms, such as:
(1) As shown in fig. 1, the testing device may employ two acoustic wave tubes, the silencer 8 to be tested is fixed between the acoustic wave tube one 13 and the acoustic wave tube two 14, the acoustic wave tube one 13 is correspondingly connected with the pressure fluctuation sensor one 9 and the pressure fluctuation sensor two 10, the acoustic wave tube one 14 is correspondingly connected with the pressure fluctuation sensor three 11 and the pressure fluctuation sensor four 12, an air outlet 7 is arranged at the end part of the acoustic wave tube one 13, and the end part of the acoustic wave tube two 14 is connected with a loudspeaker 15; air enters the two acoustic tubes through the muffler 8 to be tested and exits through the air outlet 7.
The silencer 8 to be tested is arranged between the first acoustic wave tube 13 and the second acoustic wave tube 14, the propagation direction of pressure fluctuation is perpendicular to the axial section of the throat part (namely the throat part of the Helmholtz resonator or the 1/4 wave tube or the acoustic liner small hole) of the silencer 8 to be tested, and the silencer 8 to be tested is used for measuring the sound absorption effect of the pressure fluctuation propagated in the tangential direction.
(2) As shown in fig. 2, the testing device may also use an acoustic wave tube, where one end of the acoustic wave tube three 20 is provided with an air inlet 6, and the other end is provided with an air outlet 7. The sound wave tube III 20 close to the air inlet 6 is connected with the silencer 8 to be tested, and air is introduced from the end part and enters the sound wave tube III 20 through the silencer 8 to be tested; a speaker 15 is fixedly connected to the third acoustic pipe 20 near the air outlet 7, from which end air exits.
The silencer 8 to be measured is arranged at one end of the acoustic wave tube, and the propagation direction of pressure fluctuation is parallel to the axis of the throat part (namely the throat part of the Helmholtz resonator or the 1/4 wave tube or the acoustic liner small hole) of the silencer 8 to be measured, so that the absorption effect of the silencer 8 to be measured on the pressure fluctuation propagated in the normal direction is measured.
The principle of the invention is as follows:
the signal generator 17 provides a modulated sinusoidal voltage signal with different frequencies, and the sinusoidal voltage signal is amplified by the power amplifier 16 and then drives the loudspeaker 15; the speaker 15 may excite pressure fluctuations in the acoustic wave tube at a certain frequency.
The pressure fluctuation sensors are arranged at different positions and are used for measuring the intensity of pressure fluctuation, and the collected signals are input into the signal collector. The sound absorption effect of the silencer can be obtained through analysis and calculation by means of a certain acoustic calculation method.
The air source provides experimental air which passes through the heater 4, enters the acoustic liner cavity and enters the acoustic tube from the acoustic liner porous plate. The air flow meter 3 and the regulating valve are used to control the flow rate of air. The power of the heater 4 is adjustable to change the temperature of the air entering the acoustic liner and study the effect of air flow and temperature on the sound deadening effect of the muffler.
Claims (3)
1. A muffler sound attenuation characteristic test system is characterized in that: the device comprises a testing device, a pressure fluctuation generating system, a pressure fluctuation measuring system and an air system, wherein the testing device is respectively connected with the pressure fluctuation generating system, the pressure fluctuation measuring system and the air system;
the testing device comprises an acoustic wave tube; the pressure fluctuation generating system comprises a signal generator (17), a power amplifier (16) and a loudspeaker (15); the pressure fluctuation measuring system comprises a pressure fluctuation sensor, a dynamic signal collector (18) and a dynamic signal processing and analyzing device (19);
the testing device adopts two acoustic wave tubes, and a silencer (8) to be tested is fixed between the two acoustic wave tubes: an air outlet (7) is arranged at the end part of one sound wave tube, and air enters the sound wave tube through a silencer (8) to be tested and exits from the air outlet (7); at the moment, the propagation direction of the pressure fluctuation is perpendicular to the throat axis of the silencer (8) to be tested, and the silencer (8) to be tested is used for measuring the sound absorption effect of the pressure fluctuation propagated in the tangential direction; the end part of the other sound wave tube is connected with a loudspeaker (15), the loudspeaker (15) is connected with a power amplifier (16), and the power amplifier (16) is connected with a signal generator (17); the silencer (8) to be tested is a Helmholtz resonator, or a 1/4 wave length tube, or an acoustic liner;
at least two pressure fluctuation sensors are connected to the sound wave tube, the pressure fluctuation sensors are connected to a dynamic signal collector (18), and the dynamic signal collector (18) is connected with a dynamic signal processing and analyzing device (19); the sound wave tube is connected with an air system.
2. A muffler sound attenuation characteristic test system is characterized in that: the device comprises a testing device, a pressure fluctuation generating system, a pressure fluctuation measuring system and an air system, wherein the testing device is respectively connected with the pressure fluctuation generating system, the pressure fluctuation measuring system and the air system;
the testing device comprises an acoustic wave tube; the pressure fluctuation generating system comprises a signal generator (17), a power amplifier (16) and a loudspeaker (15); the pressure fluctuation measuring system comprises a pressure fluctuation sensor, a dynamic signal collector (18) and a dynamic signal processing and analyzing device (19);
the testing device adopts an acoustic wave tube, one end of the acoustic wave tube is connected with a silencer (8) to be tested, an air inlet (6) is formed in the silencer (8) to be tested, an air outlet (7) is formed in the other end of the acoustic wave tube, and air enters the acoustic wave tube through the silencer (8) to be tested and exits from the air outlet (7); at the moment, the propagation direction of the pressure fluctuation is parallel to the throat axis of the silencer (8) to be tested, and the pressure fluctuation propagation direction is used for measuring the absorption effect of the silencer (8) to be tested on the pressure fluctuation propagated in the normal direction; the downstream of the air outlet (7) is connected with a loudspeaker (15), the loudspeaker (15) is connected with a power amplifier (16), and the power amplifier (16) is connected with a signal generator (17); the silencer (8) to be tested is a Helmholtz resonator, or a 1/4 wave length tube, or an acoustic liner;
at least two pressure fluctuation sensors are connected to the sound wave tube, the pressure fluctuation sensors are connected to a dynamic signal collector (18), and the dynamic signal collector (18) is connected with a dynamic signal processing and analyzing device (19); the sound wave tube is connected with an air system.
3. The muffler sound deadening property testing system according to claim 1 or 2, characterized in that: the air system is used for providing an air source and comprises an air source (1), a flow regulating valve (2), a flowmeter (3), a heater (4) and a temperature instrument (5), wherein the air source (1) is connected to a testing device through a pipeline, the flow regulating valve (2), the flowmeter (3), the heater (4) and the temperature instrument (5) are sequentially arranged on the pipeline, the flow of the air source (1) which is introduced into the silencer is monitored through the flowmeter (3), and the flow of the air source (1) is controlled through the flow regulating valve (2); the temperature value of the air source (1) is monitored by a thermometer, and the temperature of the air source (1) is timely adjusted by changing the power of the heater (4).
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| CN201710157043.4A CN106932481B (en) | 2017-03-16 | 2017-03-16 | Muffler noise reduction characteristic test system |
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| CN106932481B true CN106932481B (en) | 2023-06-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593271A (en) * | 2018-03-26 | 2018-09-28 | 珠海格力电器股份有限公司 | Silencer measuring device |
| CN111853412B (en) * | 2020-07-31 | 2022-06-14 | 江苏科技大学 | Noise-reducing silencing device |
| CN116499781B (en) * | 2022-05-20 | 2024-05-17 | 连云港观旭电力节能设备有限公司 | Muffler testing method, system, device and medium |
| CN114824367A (en) * | 2022-05-30 | 2022-07-29 | 国家电投集团氢能科技发展有限公司 | Method for reducing pressure fluctuation of hydrogen circulation system of fuel cell |
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