CN111289257A - Temperature-resistant acoustic liner acoustic characteristic test device and method - Google Patents
Temperature-resistant acoustic liner acoustic characteristic test device and method Download PDFInfo
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- CN111289257A CN111289257A CN202010152584.XA CN202010152584A CN111289257A CN 111289257 A CN111289257 A CN 111289257A CN 202010152584 A CN202010152584 A CN 202010152584A CN 111289257 A CN111289257 A CN 111289257A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Abstract
The application belongs to the field of acoustic tests, and particularly relates to a temperature-resistant acoustic liner acoustic characteristic test device and method. The device comprises: the device comprises an annular acoustic test platform, an acoustic lining test piece, an air supply unit, a heating unit, a noise simulation unit and an acoustic acquisition and analysis unit. The annular acoustic test platform is used for providing a stable incoming flow environment, noise simulation unit installation, temperature-resistant acoustic lining installation for the test and acoustic mode test; the air supply unit is used for simulating the tangential inflow condition of an external duct of the engine; the heating unit is used for simulating a radiation heating environment of the engine core machine to realize the heating of the inner surface of the acoustic liner; the noise simulation unit is used for generating a noise source of fan noise characteristics required by the test; the acoustic acquisition and analysis unit is used for acquiring sound pressure signals in the annular cavity. The application environment of the external duct acoustic liner of the engine can be simulated, and the acoustic liner acoustic characteristic test considering the influence of tangential incoming flow and acoustic liner temperature gradient is developed for the temperature-resistant acoustic liner.
Description
Technical Field
The application belongs to the field of acoustic tests, and particularly relates to a temperature-resistant acoustic liner acoustic characteristic test device and method.
Background
Aircraft engine noise is the main noise source of an aircraft, and mainly comprises fan noise, combustion noise, turbine noise and jet noise, wherein the fan noise is the main noise source of an engine, and the laying of an acoustic liner on the wall surface of an engine nacelle is one of the most effective methods for suppressing the fan noise.
In order to verify the performance of the engine sound liner, the noise environment of the engine fan is generally simulated by an impeller fan or a loudspeaker array, the sound liner is laid on the wall surface of a pipeline, and whether the noise reduction effect of the sound liner meets the application requirement is researched by testing parameters such as sound mode, far field directivity and the like in the pipeline under the two conditions of the soundless liner and the sound liner. The method is only suitable for the noise elimination effect test of the normal-temperature sound lining. However, when the acoustic liner is applied to the outer panel of the nacelle core nacelle cover of the nacelle, the perforated face of the acoustic liner is flowed through by the low temperature airflow of the bypass, while the back panel is in a high temperature radiation environment near the core. In this case, there is a temperature gradient in the cavity air between the top and bottom panels of the acoustic liner, which affects the acoustic impedance characteristics of the acoustic liner and changes the noise reduction effect of the acoustic liner at a particular frequency.
The existing device for the acoustic liner test does not have environment simulation aiming at a certain temperature environment or temperature gradient, and can not meet the test requirement of temperature-resistant acoustic liner acoustic characteristic research. Particularly, under the combined action of a certain tangential incoming flow and a temperature gradient, the acoustic impedance change of the acoustic liner is not resolved, and an acoustic characteristic test device and method of the temperature-resistant acoustic liner are needed to research the acoustic characteristic under the combined action of the tangential incoming flow and the temperature gradient, so that technical support is provided for the engineering application of the temperature-resistant acoustic liner.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The application aims to provide a temperature-resistant acoustic liner acoustic characteristic test device and method to solve at least one problem in the prior art.
The technical scheme of the application is as follows:
a first aspect of the present application provides a temperature-resistant acoustic liner acoustic characteristic test apparatus, comprising:
the acoustic test platform comprises an outer ring component and an inner cone of a simulated outer duct, wherein the outer ring component comprises a steady flow section, a rotary modal sound source generation section, a high-order modal attenuation section, an upstream circumferential modal test section, a downstream circumferential modal test section and a simulated nozzle which are sequentially connected, a waveguide tube is installed on the outer wall surface of the rotary modal sound source generation section, the inner cone of the simulated outer duct is arranged in the outer ring component, and an annular cavity is formed between the inner cone of the simulated outer duct and the outer ring component;
the acoustic liner test piece is sleeved on the inner cone of the simulated outer culvert and corresponds to the test section of the outer ring assembly;
the gas supply unit is arranged at one end of the steady flow section of the outer ring assembly and used for supplying gas to the annular cavity;
a heating unit disposed on the acoustic liner test piece;
a noise simulation unit connected to the waveguide;
and the acoustic acquisition and analysis unit is arranged on the upstream circumferential modal testing section and the downstream circumferential modal testing section.
Optionally, a pitot tube is mounted on an inner wall of the flow stabilizing section.
Optionally, the simulated outer duct inner cone comprises an air inlet cone, a test piece adjusting section, a test piece supporting section and an exhaust cone which are connected in sequence, and the acoustic liner test piece is installed on the test piece supporting section.
Optionally, the heating unit includes a metal heating inner ring, a thermocouple and a temperature control box, the metal heating inner ring is disposed on an inner wall surface of the acoustic liner test piece, the thermocouple is mounted on the inner wall surface and an outer wall surface of the acoustic liner test piece, and the thermocouple transmits temperature information to the temperature control box through a cable.
Optionally, 22 waveguides are uniformly arranged along the circumference of the rotating modal sound source generation segment.
Optionally, the noise simulation unit includes a sound source control system, a signal generation module, a speaker power amplifier and speakers, the number of the speakers is 22, and each speaker is connected to the corresponding waveguide.
Optionally, the acoustic collection and analysis unit includes a collection module and an analysis module, the collection module includes a microphone, and the microphone is installed on the upstream circumferential modal testing section and the downstream circumferential modal testing section.
Optionally, 22 microphones are uniformly arranged along the circumferential direction of the upstream circumferential modal testing section and the downstream circumferential modal testing section respectively.
The second aspect of the present application provides a method for testing the acoustic characteristics of a temperature-resistant acoustic liner, based on the apparatus for testing the acoustic characteristics of a temperature-resistant acoustic liner, comprising the following steps:
the method comprises the following steps: determining a test working condition, and setting parameters of the gas supply unit, the heating unit and the noise simulation unit according to the test working condition;
step two: assembling the temperature-resistant acoustic liner acoustic characteristic test device in place;
step three: the initial test was specifically:
s31, starting the air supply unit, and controlling the flow rate in the annular cavity to reach the test target tangential flow rate by adjusting the parameters of the air supply unit;
s32, after the flow field in the annular cavity is stable, starting the heating unit to heat the acoustic lining test piece, and controlling the temperature gradient of the acoustic lining test piece to reach the temperature gradient of the test target by adjusting the parameters of the heating unit;
s33, after the temperature of the acoustic liner test piece is stable, starting a noise simulation unit, and adjusting the parameters of the noise simulation unit to reach the noise frequency, the mode and the sound pressure level of the test target;
and S34, starting the acoustic acquisition and analysis unit, acquiring acoustic mode parameters and acoustic pressure levels of the upstream circumferential mode test section and the downstream circumferential mode test section, and analyzing and comparing to obtain the noise reduction amount of the acoustic liner test piece in the annular cavity under the test working condition.
Optionally, in the second step, assembling the temperature-resistant acoustic liner acoustic characteristic test apparatus in place specifically includes:
s21, mounting the heating unit on the acoustic liner test piece;
s22, sleeving the acoustic liner test piece on the inner cone of the simulated outer culvert, wherein the test piece corresponds to the test section of the outer ring assembly, and after the installation is finished, the outer ring assembly of the annular acoustic test platform is checked and adjusted to be concentric with the inner cone of the simulated outer culvert;
and S23, connecting the air supply unit, the heating unit, the noise simulation unit and the acoustic collection and analysis unit in place.
The invention has at least the following beneficial technical effects:
the temperature-resistant acoustic liner acoustic characteristic test device can simulate the application environment of an external duct acoustic liner of an engine, and carries out an acoustic liner acoustic characteristic test considering the influence of tangential incoming flow and acoustic liner temperature gradient aiming at the temperature-resistant acoustic liner, so that the noise reduction effect of the temperature-resistant acoustic liner under a certain condition can be verified, and the noise reduction capability of the acoustic liner under different incoming flow conditions and different temperature gradients can be researched; the method has important engineering value and guiding significance for the design and verification of the temperature-resistant acoustic liner acoustic applied to the inner wall surface of the outer duct of the engine, and has the advantages of complete functions, strong expansibility, convenience in operation and the like.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of a temperature-resistant acoustic liner acoustic characteristic testing apparatus according to an embodiment of the present application;
FIG. 2 is a schematic view of an annular acoustic test platform of a temperature resistant acoustic liner acoustic property testing apparatus according to an embodiment of the present application;
FIG. 3 is a schematic view of a simulated extraductal inner cone of a temperature resistant acoustic liner acoustic characteristic testing apparatus according to an embodiment of the present application;
FIG. 4 is a modal characteristic diagram of an upstream circumferential modal test segment under test conditions of an embodiment of the present application;
FIG. 5 is a modal characteristic diagram of a downstream circumferential modal test segment under the same test conditions of FIG. 4;
FIG. 6 is a frequency versus noise reduction graph under certain operating conditions according to an embodiment of the present application.
Wherein:
1-steady flow section; 2-rotating modal sound source generation section; 3-a higher-order mode attenuation section; 4-an upstream circumferential modal testing section; 5-test section; 6-downstream circumferential modal testing section; 7-simulating a nozzle; 8-simulating an inner cone of the outer duct; 81-an air inlet cone; 82-test piece adjustment section; 83-test piece support section; 84-an exhaust cone; 9-a waveguide; 10-acoustic liner test piece.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.
The present application is described in further detail below with reference to fig. 1 to 6.
The application provides in a first aspect a temperature resistant acoustic liner acoustic characteristic test apparatus, includes: the device comprises an annular acoustic test platform, an acoustic lining test piece 10, an air supply unit, a heating unit, a noise simulation unit and an acoustic acquisition and analysis unit.
Specifically, the annular acoustic test platform is a platform for providing a stable incoming flow environment, noise simulation unit installation, temperature-resistant acoustic lining installation for the test and acoustic mode test. Annular acoustic test platform includes outer loop subassembly and the interior cone 8 of outer duct of simulation, the outer loop subassembly is including the stationary flow section 1 that connects gradually, section 2 takes place for the rotary mode sound source, high-order modal attenuation section 3, upper reaches circumference modal test section 4, test section 5, lower reaches circumference modal test section 6 and simulation spout 7, the waveguide 9 is installed to the outer wall of section 2 takes place for the rotary mode sound source, the interior cone 8 of outer duct of simulation sets up inside the outer loop subassembly, and the outer loop subassembly between have the toroidal cavity. The acoustic liner test piece 10 is sleeved on the inner cone 8 of the simulated outer duct and corresponds to the test section 5 of the outer ring component.
In one embodiment of the present application, the simulated extraductal cone 8 includes an inlet cone 81, an inner cone test section, and an exhaust cone 84 connected in series. Advantageously, in this embodiment, the inner cone testing section may include a testing member adjusting section 82 and a testing member supporting section 83, the testing member adjusting section 82 may be detachably connected to the air inlet cone 81 and the testing member supporting section 83, the adjusting of the relative position of the testing member supporting section 83 and the testing section 5 of the outer ring assembly is achieved by assembling the testing member adjusting sections 82 with different lengths, and the acoustic liner testing member 10 is installed on the testing member supporting section 83, and the position of the acoustic liner testing member 10 corresponds to the testing section 5 of the outer ring assembly.
The utility model provides a temperature resistant sound lining acoustic characteristic test device, air feed unit set up in the stationary flow section 1 one end of outer ring subassembly, provide the air supply entering annular acoustic test platform's of certain flow toroidal cavity, simulate the outer duct air current condition of engine. Advantageously, in one embodiment of the present application, the flow rate in the annular cavity is obtained by mounting a pitot tube on the inner wall of the flow stabilizer 1. It can be understood that, in this embodiment, a speed measuring device may be further disposed on the inner wall of the steady flow section 1, so as to provide feedback to the air supply unit, and achieve a better air supply adjustment effect.
The maximum flow of the air supply unit is the basis for designing the annular acoustic test platform, the section size of the annular cavity is required to be determined according to the flow speed required by the test, and the inner diameter and the outer diameter of the annular cavity are determined by combining the sound propagation characteristic in the pipeline. After the inner diameter and the outer diameter of the annular pipeline are determined, scaling design can be carried out according to different models of the real engine to obtain the molded line of the outer surface of the air inlet cone 84 and the molded line of the inner surface of the simulated nozzle 7, so that the flow characteristic of the nozzle of the outer duct of the real engine is simulated.
The application discloses temperature resistant sound lining acoustic characteristic test device, heating unit set up on sound lining test 10 for the simulation engine core machine radiation heating environment realizes the heating of sound lining test 10 internal surface. In an embodiment of the application, the heating unit comprises a metal heating inner ring, a thermocouple and a temperature control box, the metal heating inner ring is tightly attached to the inner wall surface of the acoustic liner test piece 10 to ensure that the inner wall surface of the acoustic liner test piece 10 is uniformly heated, the thermocouple is arranged at the attachment part to collect the temperature of the inner wall surface of the acoustic liner test piece 10 in real time, the thermocouple is arranged on the outer wall surface of the acoustic liner test piece 10, the thermocouple transmits temperature information to the temperature control box through a cable, PID closed-loop control of temperature gradient is realized through the temperature control box, and the temperature gradient of the acoustic liner test piece 10 is ensured to reach a set target temperature. It will be appreciated that the heating unit is not only implemented in one of the above-described electrical heating methods, but that other radiant heating methods may also provide a heat source for the apparatus.
The application relates to a temperature-resistant acoustic liner acoustic characteristic test device, wherein a noise simulation unit is connected with a waveguide tube 9 and used for generating a noise source with fan noise characteristics required by a test. In one embodiment of the present application, the noise simulation unit includes a sound source control system, a signal generation module, a speaker power amplifier, and a speaker, and is connected to the waveguide 9 through the speaker. It is understood that the noise simulation unit is not only implemented by one method of the electrodynamic loudspeaker array, but also by the rotor blade and the stator blade.
The application discloses temperature resistant sound lining acoustic characteristic test device, acoustics are gathered and the analytical element sets up on upstream circumference modal test section 4 and downstream circumference modal test section 6 for gather the acoustic pressure signal in the annular cavity. In an embodiment of the present application, the acoustic collection and analysis unit includes a collection module and an analysis module, the collection module includes a collection system, a signal collection card, a microphone, and the like, the microphone is disposed in the upstream circumferential modal testing section 4 and the downstream circumferential modal testing section 6, and the collection module can collect a microphone array sound pressure signal or a far field directional sound pressure signal in the annular cavity; the analysis module may include a host computer with analysis software.
The application discloses temperature resistant acoustic lining acoustic characteristic test device, the figure of waveguide 9 and speaker is designable, can design N speakers and be connected with the waveguide 9 of the same figure respectively. Based on the characteristics of generating the noise pipeline mode of the fan of the turbofan engine, the noise source with the same frequency and the corresponding phase difference of m-order circumferential mode of 2m pi/N is generated by utilizing N loudspeakers uniformly distributed in the circumferential direction, so that the simulation of the maximum circumferential mode number of mmaxThe circumferential modal characteristics of N/2-1 can generate the noise frequency, mode and sound pressure level required by the test according to the test requirement. In this embodiment, 22 waveguides 9 are uniformly arranged along the circumferential direction of the rotational mode sound source generation section 2, and 22 speakers of the noise simulation unit are also provided and are respectively connected to the corresponding waveguides 9. Advantageously, in this embodiment, 22 microphones are uniformly arranged along the circumferential direction of the upstream circumferential mode testing section 4 and the downstream circumferential mode testing section 6, respectively, and the uniformly distributed 22 microphones cooperate with the acoustic acquisition and analysis unit to obtain acoustic mode information in the annular cavity in front of the acoustic liner test piece 10 and in back of the acoustic liner test piece 10.
The second aspect of the present application provides a temperature-resistant acoustic liner acoustic characteristic test method, based on the above temperature-resistant acoustic liner acoustic characteristic test apparatus, including the following steps:
the method comprises the following steps: determining a test working condition, and setting parameters of the gas supply unit, the heating unit and the noise simulation unit according to the test working condition; the relevant parameters may include temperature gradient target values of the heating unit, frequency, mode and sound pressure level of the noise modeling unit, etc.
Step two: assembling the temperature-resistant acoustic liner acoustic characteristic test device in place, and specifically comprising:
s21, mounting the heating unit on the acoustic liner test piece 10, namely, tightly attaching the inner wall surface of the annular acoustic liner test piece 10 to the electric heating inner ring, and arranging thermocouples on the inner wall surface and the outer wall surface of the acoustic liner test piece 10;
s22, sleeving the acoustic liner test piece 10 on the simulated outer culvert inner cone 8, wherein the position of the acoustic liner test piece corresponds to the test section 5 of the outer ring assembly, and after the acoustic liner test piece is installed, checking and adjusting the acoustic liner test piece to enable the outer ring assembly of the annular acoustic test platform to be concentric with the simulated outer culvert inner cone 8;
and S23, connecting the air supply unit, the heating unit, the noise simulation unit and the acoustic collection and analysis unit in place.
Step three: the initial test was specifically:
s31, starting the air supply unit, and controlling the flow rate in the annular cavity to reach the test target tangential flow rate by adjusting the parameters of the air supply unit; parameters of the air supply unit can be adjusted through feedback of a speed measuring device arranged on the steady flow section 1;
s32, after the flow field in the annular cavity is stable, starting a heating unit to heat the acoustic lining test piece 10, and after the thermocouple arranged on the inner wall and the outer wall of the acoustic lining test piece 10 feeds back the temperature, controlling the temperature gradient of the acoustic lining test piece 10 to reach the temperature gradient of the test target by adjusting the parameters of the heating unit;
s33, after the temperature of the acoustic liner test piece 10 is stable, starting a noise simulation unit, adjusting the parameters of the noise simulation unit to enable a sound source control system to send out a loudspeaker array driving signal (including signal frequency, phase, amplitude and the like), wherein the signal drives the loudspeaker array to sound after being subjected to thermal refining and filtering by a power amplifier to reach the noise frequency, mode and sound pressure level of a test target;
and S34, starting an acoustic acquisition and analysis unit, acquiring acoustic mode parameters and acoustic pressure levels of the upstream circumferential mode testing section 4 and the downstream circumferential mode testing section 6, and analyzing and comparing to obtain the noise reduction amount of the acoustic liner test piece 10 in the annular cavity under the test working condition.
According to the temperature-resistant acoustic liner acoustic characteristic test method, the noise reduction characteristic of the temperature-resistant acoustic liner under the conditions that tangential flow exists on the outer side and temperature gradient exists in the inner cavity can be obtained. And adjusting test parameters such as tangential flow velocity or temperature gradient, repeating the test steps to obtain acoustic modal parameters before and after entering the acoustic liner under different flow velocities and different temperature gradients, and further researching the influence of the tangential flow velocity and the temperature gradient on the noise reduction characteristic of the temperature-resistant acoustic liner.
The application discloses temperature resistant sound lining acoustic characteristic test method uses a temperature resistant sound lining as the test object, carries out the test that the experimental operating mode is 0.2Ma incoming flow, 170 ℃ temperature gradient, 2000Hz, 2 nd order circumference mode, total sound pressure level 130dB noise, obtains the interior noise reduction effect of pipeline, specifically includes:
preparation of the test: the inner wall surface of the acoustic liner test piece 10 is tightly attached to the inner metal heating ring, the thermocouples are adhered to the inner wall surface and the outer wall surface of the acoustic liner test piece 10, then the acoustic liner test piece 10 is installed on the inner cone 8 of the simulated outer culvert, and all equipment is connected in place.
The test process comprises the following steps: firstly, starting an air supply unit, placing a pitot tube in a steady flow section 1 to obtain the flow velocity in an annular pipeline, and gradually increasing the flow of the air supply unit to stabilize the flow velocity in a test platform to 0.2 Ma; starting a heating unit to heat the acoustic lining test piece 10, controlling the temperature gradient of the acoustic lining test piece 10 through a temperature control box, and feeding real-time temperature signals obtained by thermocouples adhered to the inner wall surface and the outer wall surface of the acoustic lining test piece 10 back to a PID (proportion integration differentiation) controller of a temperature control system to enable the temperature gradient in the acoustic lining to reach 170 ℃; starting a noise simulation unit, and sending a loudspeaker array driving signal through a sound source control system, wherein the frequency is 2000Hz, the phase difference is 2 pi/11, and the total sound pressure level is 130dB of noise; and starting the acoustic acquisition and analysis unit, acquiring sound pressure data of the 44 microphones within 30s, and entering an acquisition system through a signal acquisition card for storage.
Processing test data:
after the test is finished, the acoustic acquisition and analysis unit is used for processing the acquired sound pressure data by using a signal cross-correlation method to obtain the modal distribution of the pipeline under the test working condition. Namely, the modal characteristics of the acoustic liner test piece 10 under the noise conditions of an incoming flow velocity of 0.2Ma, a temperature gradient of 170 ℃, a noise of 2000Hz, a 2 nd order circumferential mode and a total sound pressure level of 130dB are shown in fig. 4 and 5. It can be seen that 2-step circumferential acoustic modes in the pipeline are formed, the maximum sound pressure levels before and after entering the acoustic liner are 124.5dB and 111.5dB respectively, and the noise reduction of the acoustic liner under the working condition can be calculated to be 13 dB.
Keeping the temperature gradient at 170 ℃, keeping the conditions of 2000Hz, 2-order circumferential mode and total sound pressure level at 130dB unchanged, adjusting the incoming flow speed, repeatedly measuring the sound pressure levels of the upstream and downstream 2-order modes of the sound liner, and comparatively researching the noise reduction effect of the sound liner under Mach numbers of 0.1 and 0.3:
1. the Mach number is 0.1, and the sound pressure levels of upstream and downstream modes are respectively 122.4dB and 116.3dB when the temperature gradient is 170 ℃, namely the noise reduction of the acoustic liner under the working condition is 6.1 dB.
2. The Mach number is 0.3, and the sound pressure levels of upstream and downstream modes are respectively 125.6dB and 113.2dB when the temperature gradient is 170 ℃, namely the noise reduction of the acoustic liner under the working condition is 12.4 dB.
The noise reduction performance under the three working conditions is compared, and the high-flow-rate noise reduction effect is good for the temperature-resistant sound liner.
The following conditions of 0.2 mach number of incoming flow, 170 ℃ temperature gradient, 2-order circumferential mode and 130dB total sound pressure level noise are kept unchanged, and the noise reduction amount of the sound liner in the pipeline is tested under the conditions of 2000Hz, 2100Hz, 2200Hz, 2300Hz, 2400Hz, 2500Hz, 2600Hz, 2700Hz, 2800Hz, 2900Hz and 3000Hz, so that a frequency-noise reduction curve can be obtained as shown in FIG. 6. The optimal noise reduction frequency of the acoustic liner under the conditions of an incoming flow Mach number of 0.2, a temperature gradient of 170 ℃, a 2-order circumferential mode and total sound pressure level noise of 130dB is 2700 Hz.
It is understood that in the above test method, the acoustic characteristics of the acoustic liner can also be studied by comparing the acoustic liner with the soundless liner; in experimental tests, the acoustic characteristics of the acoustic liner can also be studied by means of far-field acoustic parameters.
The temperature-resistant acoustic liner acoustic characteristic test device and method can carry out acoustic characteristic tests on the temperature-resistant acoustic liner at different tangential incoming flow speeds and different back plate temperatures, study the influence of the tangential flow speed and the acoustic backing plate temperature (temperature gradient) on the noise reduction effect of the acoustic liner, and have important reference value on the design and application of the temperature-resistant acoustic liner represented by the titanium alloy acoustic liner.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A temperature resistant acoustic liner acoustic characteristic test apparatus, comprising:
the annular acoustic test platform comprises an outer ring component and a simulated outer duct inner cone (8), wherein the outer ring component comprises a steady flow section (1), a rotary modal sound source generation section (2), a high-order modal attenuation section (3), an upstream circumferential modal test section (4), a test section (5), a downstream circumferential modal test section (6) and a simulated nozzle (7) which are sequentially connected, a waveguide tube (9) is installed on the outer wall surface of the rotary modal sound source generation section (2), the simulated outer duct inner cone (8) is arranged in the outer ring component, and an annular cavity is formed between the simulated outer duct inner cone and the outer ring component;
the acoustic liner test piece (10), the acoustic liner test piece (10) is sleeved on the inner cone (8) of the simulated outer duct and corresponds to the test section (5) of the outer ring component;
the gas supply unit is arranged at one end of the steady flow section (1) of the outer ring assembly and used for supplying gas to the annular cavity;
a heating unit disposed on the acoustic liner test piece (10);
a noise simulation unit connected to the waveguide (9);
and the acoustic acquisition and analysis unit is arranged on the upstream circumferential modal testing section (4) and the downstream circumferential modal testing section (6).
2. The temperature-resistant acoustic liner acoustic characteristic test device according to claim 1, wherein a pitot tube is mounted on an inner wall of the flow stabilizer (1).
3. The temperature-resistant acoustic liner acoustic characteristic test apparatus according to claim 1, wherein the simulated extraductal inner cone (8) comprises an air inlet cone (81), a test piece adjusting section (82), a test piece supporting section (83) and an air exhaust cone (84) which are connected in sequence, and the acoustic liner test piece (10) is mounted on the test piece supporting section (83).
4. The temperature-resistant acoustic liner acoustic characteristic test device according to claim 1, wherein the heating unit comprises a metal heating inner ring, a thermocouple and a temperature control box, the metal heating inner ring is arranged on the inner wall surface of the acoustic liner test piece (10), the thermocouple is arranged on the inner wall surface and the outer wall surface of the acoustic liner test piece (10), and the thermocouple transmits temperature information to the temperature control box through a cable.
5. The temperature-resistant acoustic liner acoustic characteristic test apparatus according to claim 1, wherein 22 waveguides (9) are uniformly arranged along a circumferential direction of the rotational modal sound source generation section (2).
6. The temperature-resistant acoustic liner acoustic characteristic test device of claim 5, wherein the noise simulation unit comprises a sound source control system, a signal generation module, a loudspeaker power amplifier and loudspeakers, the number of the loudspeakers is 22, and each loudspeaker is connected with the corresponding waveguide tube (9).
7. The temperature-resistant acoustic liner acoustic property testing apparatus of claim 6, wherein the acoustic collection and analysis unit comprises a collection module and an analysis module, the collection module comprising microphones mounted on the upstream circumferential modal test section (4) and the downstream circumferential modal test section (6).
8. The temperature-resistant acoustic liner acoustic characteristic test apparatus of claim 7, wherein 22 microphones are uniformly arranged along the circumferential direction of the upstream circumferential mode testing section (4) and the downstream circumferential mode testing section (6), respectively.
9. A temperature-resistant acoustic liner acoustic characteristic test method based on the temperature-resistant acoustic liner acoustic characteristic test apparatus according to claims 1 to 8, characterized by comprising the steps of:
the method comprises the following steps: determining a test working condition, and setting parameters of the gas supply unit, the heating unit and the noise simulation unit according to the test working condition;
step two: assembling the temperature-resistant acoustic liner acoustic characteristic test device in place;
step three: the initial test was specifically:
s31, starting the air supply unit, and controlling the flow rate in the annular cavity to reach the test target tangential flow rate by adjusting the parameters of the air supply unit;
s32, after the flow field in the annular cavity is stable, starting a heating unit to heat the acoustic lining test piece (10), and controlling the temperature gradient of the acoustic lining test piece (10) to reach the temperature gradient of the test target by adjusting the parameters of the heating unit;
s33, after the temperature of the acoustic liner test piece (10) is stable, starting a noise simulation unit, and adjusting the parameters of the noise simulation unit to reach the noise frequency, the mode and the sound pressure level of a test target;
and S34, starting an acoustic acquisition and analysis unit, acquiring acoustic mode parameters and acoustic pressure levels of the upstream circumferential mode test section (4) and the downstream circumferential mode test section (6), and analyzing and comparing to obtain the noise reduction amount of the acoustic liner test piece (10) in the annular cavity under the test working condition.
10. The temperature-resistant acoustic liner acoustic characteristic test method according to claim 9, wherein in the second step, assembling the temperature-resistant acoustic liner acoustic characteristic test apparatus in place specifically comprises:
s21, mounting the heating unit on the acoustic liner test piece (10);
s22, sleeving the acoustic liner test piece (10) on the simulated outer culvert inner cone (8) and corresponding to the test section (5) of the outer ring assembly, and checking and adjusting after the installation so that the outer ring assembly of the annular acoustic test platform is concentric with the simulated outer culvert inner cone (8);
and S23, connecting the air supply unit, the heating unit, the noise simulation unit and the acoustic collection and analysis unit in place.
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| CN202010152584.XA CN111289257A (en) | 2020-03-06 | 2020-03-06 | Temperature-resistant acoustic liner acoustic characteristic test device and method |
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| CN112268708A (en) * | 2020-09-21 | 2021-01-26 | 西北工业大学 | Axial flow turbine refined acoustic experimental device and experimental method |
| CN113567084A (en) * | 2021-07-21 | 2021-10-29 | 北京航空航天大学 | But quick assembly disassembly's sound lining fixing device |
| CN114013683A (en) * | 2021-11-05 | 2022-02-08 | 中国航发沈阳发动机研究所 | Method for testing noise reduction performance of engine fan acoustic liner |
| US20220236138A1 (en) * | 2021-07-13 | 2022-07-28 | Beihang University | Comprehensive performance test platform for acoustic liner |
| CN115076729A (en) * | 2021-03-12 | 2022-09-20 | 中国航发商用航空发动机有限责任公司 | Combustion chamber and verification method for sound absorption effect of combustion chamber |
| CN115243184A (en) * | 2022-07-01 | 2022-10-25 | 北京航空航天大学 | Acoustic lining measuring device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268708A (en) * | 2020-09-21 | 2021-01-26 | 西北工业大学 | Axial flow turbine refined acoustic experimental device and experimental method |
| CN115076729A (en) * | 2021-03-12 | 2022-09-20 | 中国航发商用航空发动机有限责任公司 | Combustion chamber and verification method for sound absorption effect of combustion chamber |
| CN115076729B (en) * | 2021-03-12 | 2023-09-26 | 中国航发商用航空发动机有限责任公司 | Combustion chamber and verification method for sound absorption effect of combustion chamber |
| US20220236138A1 (en) * | 2021-07-13 | 2022-07-28 | Beihang University | Comprehensive performance test platform for acoustic liner |
| US11474001B2 (en) * | 2021-07-13 | 2022-10-18 | Beihang University | Comprehensive performance test platform for acoustic liner |
| EP4145101A4 (en) * | 2021-07-13 | 2023-05-03 | Beihang University | Test platform for comprehensive performance of acoustic liner |
| CN113567084A (en) * | 2021-07-21 | 2021-10-29 | 北京航空航天大学 | But quick assembly disassembly's sound lining fixing device |
| CN113567084B (en) * | 2021-07-21 | 2022-11-22 | 北京航空航天大学 | But quick assembly disassembly's sound lining fixing device |
| CN114013683A (en) * | 2021-11-05 | 2022-02-08 | 中国航发沈阳发动机研究所 | Method for testing noise reduction performance of engine fan acoustic liner |
| CN114013683B (en) * | 2021-11-05 | 2023-11-28 | 中国航发沈阳发动机研究所 | Engine fan acoustic liner noise reduction performance test method |
| CN115243184A (en) * | 2022-07-01 | 2022-10-25 | 北京航空航天大学 | Acoustic lining measuring device |
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