CN218632125U - Fuel cell silencing device and fuel cell system - Google Patents

Fuel cell silencing device and fuel cell system Download PDF

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Publication number
CN218632125U
CN218632125U CN202222905453.1U CN202222905453U CN218632125U CN 218632125 U CN218632125 U CN 218632125U CN 202222905453 U CN202222905453 U CN 202222905453U CN 218632125 U CN218632125 U CN 218632125U
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fuel cell
perforated pipe
outer cylinder
micro
formula
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罗玉兰
赵兴旺
李飞强
方川
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Beijing Sinohytec Co Ltd
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Beijing Sinohytec Co Ltd
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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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The utility model provides a fuel cell silencing device and a fuel cell system, which comprises a perforated pipe, an outer cylinder and a clapboard, wherein one end of the perforated pipe is a gas inlet, the other end of the perforated pipe is a gas outlet, the surface of a first area of the perforated pipe is provided with a micro-perforation along the radial direction, and the surface of a second area of the perforated pipe is provided with a resonance cavity along the radial direction; the outer cylinder body is arranged on the periphery of the perforated pipe, and a closed cavity is formed between the inner side of the outer cylinder body and the outer side of the perforated pipe; the partition plate is arranged between the perforated pipe and the outer cylinder body and separates the micro-perforation from the resonant cavity hole. The outer surface of the first area of the perforated pipe, the outer cylinder and the partition board form a micro-perforated area, when high-pressure gas passes through micro-perforations, the vibration of gas particles generates viscous force and frictional resistance to convert gas sound energy into heat energy, the resistance is small, the regeneration noise is low, and the high-pressure gas is used for high-frequency noise reduction; the outer surface of the second area of the perforated pipe, the outer cylinder and the partition plate form a resonant cavity area, and gas sound energy is converted into heat energy through resonance and air column friction for low-frequency noise reduction.

Description

Fuel cell silencing device and fuel cell system
Technical Field
The utility model relates to a fuel cell vehicle technical field, concretely relates to fuel cell silencing device and contain this silencing device's fuel cell system.
Background
The fuel cell engine is as a hydrogen energy conversion device, turn into kinetic energy with chemical energy through chemical reaction, high-pressure gas after air system and hydrogen system reaction is arranged the environment through tail silencer, along with the rapid development of fuel cell car, the increase of power demand, its exhaust noise problem is prominent day by day, the noise derives from air system and hydrogen system, tail exhaust noise belongs to the broadband noise, the low and medium high frequency channel has been covered, simultaneously, fuel cell produces liquid water and discharges through tail silencer in the course of the work. Therefore, tail silencing of a fuel cell engine is an important research content for improving product quality, and generally, a fuel cell adopts a two-stage silencing device or a single silencing device or a resistive filling material, so that the system complexity is obviously increased by adopting the two-stage silencing device; a single silencing device is adopted, the exhaust silencing frequency range is limited, and low, medium and high frequency noises cannot be covered; the use of resistive filler materials results in performance degradation due to drainage. In such a case, the fuel cell engine exhaust noise problem will have a significant impact on customer ride comfort.
Therefore, it is desirable to provide a fuel cell silencing device and a fuel cell system to solve the problem of low, medium and high frequency noise generated during the operation of the fuel cell engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fuel cell silencing device and fuel cell system solve the low well high frequency noise's that produces among the fuel cell engine working process problem of making an uproar of falling, widen tail row noise amortization frequency channel.
In order to realize the purpose, the following technical scheme is provided:
the utility model provides a fuel cell silencing device, include:
the gas inlet is arranged at one end of the perforated pipe, the gas outlet is arranged at the other end of the perforated pipe, the surface of a first area of the perforated pipe is provided with micro-perforations along the radial direction, and the surface of a second area of the perforated pipe is provided with resonance cavity holes along the radial direction;
the outer cylinder body is arranged on the periphery of the perforated pipe, and a closed cavity is formed between the inner side of the outer cylinder body and the outer side of the perforated pipe;
a baffle disposed between the perforated tube and the outer cylinder and separating the microperforations from the resonant cavity bore;
the outer surface of the first region of the perforated tube, the outer cylinder and the separator plate form a micro-perforated region, and the outer surface of the second region of the perforated tube, the outer cylinder and the separator plate form a resonance cavity region.
Optionally, a water outlet is formed in the first area where the micro-perforation is located, and the first area is located below the outer cylinder.
Optionally, the outer cylinder is in a circular truncated cone shape, and the diameter of the end close to the gas inlet is smaller than the diameter of the end close to the gas outlet.
Optionally, the fuel cell silencing device further includes a front end cover and a rear end cover, the front end cover is disposed at one end of the perforated pipe located at the gas inlet, the rear end cover is disposed at one end of the perforated pipe located at the gas outlet, two ends of the outer cylinder are respectively connected to the front end cover and the rear end cover in a sealing manner, and a closed cavity is formed between the perforated pipe, the outer cylinder, the front end cover and the rear end cover.
Optionally, the microperforations have a diameter of less than 1mm and a perforation rate of less than 6%.
Optionally, the diameter of the resonant cavity hole is larger than 2mm, and the perforation rate is 10% -15%.
Alternatively, the expression of the resonant frequency of the resonant cavity region can be obtained according to newton's second law and the equation of state of an ideal gas:
Figure 100002_DEST_PATH_IMAGE001
is like
In the first formula, the first reaction chamber is provided with a first reaction chamber,
Figure 588899DEST_PATH_IMAGE002
in order to be the speed of sound,
Figure 369773DEST_PATH_IMAGE004
is the cross section area of the small hole,
Figure 100002_DEST_PATH_IMAGE005
in order to have a closed cavity volume,
Figure 682943DEST_PATH_IMAGE006
，
Figure 100002_DEST_PATH_IMAGE007
is the length of the small hole, and the length of the small hole,
Figure 586177DEST_PATH_IMAGE008
to correct the value when the diameter of the circular hole is
Figure 100002_DEST_PATH_IMAGE009
When the utility model is used, the water is discharged,
Figure 220683DEST_PATH_IMAGE010
is the effective length of the aperture.
Optionally, according to a microperforated panel acoustic impedance theoretical model of margard \29495, the expression of the relative acoustic impedance is as follows:
Figure 100002_DEST_PATH_IMAGE011
formula II
In the second formula, the first and second groups are,
Figure 601986DEST_PATH_IMAGE012
which represents the relative acoustic resistivity of the sound,
Figure 100002_DEST_PATH_IMAGE013
show relativeThe sound-reactance rate of the sound wave is improved,
Figure 35241DEST_PATH_IMAGE014
formula III
Figure 100002_DEST_PATH_IMAGE015
Formula IV
In the third formula and the fourth formula,
Figure 70894DEST_PATH_IMAGE016
in order to be the diameter of the micro-perforations,
Figure 100002_DEST_PATH_IMAGE017
the number of the holes is the perforation rate,
Figure 100002_DEST_PATH_IMAGE019
in order to provide a depth of micro-perforation,
Figure 222389DEST_PATH_IMAGE020
constant of microperforated plate for coefficient of air kinematic viscosity
Figure 100002_DEST_PATH_IMAGE021
，
Figure 407383DEST_PATH_IMAGE022
Is the incident wave frequency.
Specific acoustic impedance of the cavity
Figure 100002_DEST_PATH_IMAGE023
Comprises the following steps:
Figure 931030DEST_PATH_IMAGE024
formula five
In the fifth step, the reaction mixture is reacted,
Figure 100002_DEST_PATH_IMAGE025
is the cavity depth;
combined one to five, canObtaining the relative specific acoustic impedance of the micro-perforated structure
Figure 100002_DEST_PATH_IMAGE027
Comprises the following steps:
Figure 441646DEST_PATH_IMAGE028
formula six
According to the classic micro-perforated plate theory proposed by Ma \29495
Figure 100002_DEST_PATH_IMAGE029
Comprises the following steps:
Figure 814859DEST_PATH_IMAGE030
formula seven
Alternatively, the sound absorption structure in the microperforated region may have an acoustic reactance of 0 when resonance occurs, at which point the maximum sound absorption coefficient
Figure 100002_DEST_PATH_IMAGE031
Comprises the following steps:
Figure 36499DEST_PATH_IMAGE032
type eight
Absorption peak resonant frequency
Figure 100002_DEST_PATH_IMAGE033
The following equation is satisfied:
Figure 913188DEST_PATH_IMAGE034
nine-degree of expression
The sound absorption coefficient is the maximum sound absorption coefficient
Figure 532389DEST_PATH_IMAGE031
The frequency of half of the time satisfies the following equation:
Figure 100002_DEST_PATH_IMAGE035
the formula is ten.
The utility model also provides a fuel cell system, including above-mentioned any one technical scheme fuel cell silencing device.
Compared with the prior art, the utility model provides a fuel cell silencing device and fuel cell system, the resonant cavity region is formed into the resonant cavity by a section of perforated pipe, outer barrel, the baffle that open has a plurality of resonant cavity holes, and the resonant cavity hole forms the elastic vibration system with the resonant cavity, thereby converts gas sound energy into heat energy through resonance and air column friction for the noise reduction of fuel cell exhaust low frequency noise; the micro-perforated area consists of a plurality of micro-perforations, an outer cylinder body and a partition board, when high-pressure gas passes through the micro-perforations, the vibration of gas particles generates viscous force and frictional resistance to convert gas sound energy into heat energy, so that the noise reduction effect is achieved, the gas resistance is small, the gas flow regeneration noise is low, and the noise reduction device is suitable for reducing high-frequency noise in fuel cell exhaust.
The following detailed description is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
Fig. 1 shows a cross-sectional view of a fuel cell silencing apparatus of an embodiment of the present invention;
fig. 2 shows a right side view of a fuel cell silencing apparatus of an embodiment of the present invention;
fig. 3 is a schematic diagram showing an internal structure of a fuel cell silencer according to an embodiment of the present invention.
Reference numerals are as follows:
10-a perforated tube; 101-micro perforation; 102-a resonant cavity aperture;
20-a gas inlet; 30-a gas outlet; 40-a front end cover; 50-rear end cap;
60-outer cylinder body; 601-front end of outer cylinder; 602-the rear end of the outer cylinder;
70-a water outlet; 80-a separator; 90-micro-perforated region; 100-resonant cavity region.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "including" and variations thereof as used herein is intended to be open-ended, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
As shown in fig. 1 to 3, the present embodiment provides a fuel cell silencing apparatus including: the gas inlet and outlet perforated pipe comprises a perforated pipe 10, an outer cylinder 60 and a partition plate 80, wherein one end of the perforated pipe 10 is a gas inlet 20, the other end of the perforated pipe is a gas outlet 30, a first area surface of the perforated pipe 10 is provided with micro perforations 101 along the radial direction, and a second area surface of the perforated pipe 10 is provided with resonance cavity holes 102 along the radial direction; the outer cylinder 60 is arranged on the periphery of the perforated pipe 10, and a closed cavity is formed between the inner side of the outer cylinder 60 and the outer side of the perforated pipe 10; the partition 80 is disposed between the perforated pipe 10 and the outer cylinder 60 and separates the micro-perforations 101 from the resonance chamber holes 102; the first region of the perforated tube 10 outer surface, outer cylinder and separator plate 80 form a micro-perforated region 90 and the second region of the perforated tube 10 outer surface, outer cylinder and separator plate 80 form a resonant cavity region 100.
Referring to fig. 2, the resonant cavity region 100 of the present embodiment includes a section of perforated pipe 10 with a plurality of resonant cavity holes 102, an outer cylinder 60, and a partition plate 80 to form a resonant cavity, where the resonant cavity holes 102 and the resonant cavity form an elastic vibration system, and the elastic vibration system converts gas sound energy into heat energy through resonance and air column friction, so as to reduce noise of low-frequency noise of exhaust gas of the fuel cell; the micro-perforated area 90 is composed of a plurality of micro-perforations 101, the outer cylinder body 60 and the partition plate 80, when high-pressure gas passes through the micro-perforations 101, the vibration of gas particles generates viscous force and frictional resistance to convert gas sound energy into heat energy, the noise reduction effect is achieved, the gas resistance is small, the airflow regeneration noise is low, and the noise reduction device is suitable for reducing high-frequency noise in fuel cell exhaust.
Optionally, the first region where the micro-perforated holes 101 are located is located below the outer cylinder 60 and is provided with the water discharge port 70, so that the water discharge function is realized without affecting the sound attenuation, and the micro-perforated region 90 does not damage the structure of the resonant cavity holes 102 of the resonant cavity region 100, which results in a great reduction of the sound attenuation effect.
Preferably, as shown in fig. 1, the outer cylinder 60 is in the shape of a circular truncated cone, and the diameter of the end close to the gas inlet 20 (i.e. the front end 601 of the outer cylinder) is smaller than the diameter of the end close to the gas outlet 30 (i.e. the rear end 602 of the outer cylinder), so that the noise reduction device has a variable cross-section design to achieve a broadband noise reduction effect for high-pressure gas at low, medium and high frequencies.
Further, referring to fig. 1, the fuel cell silencing apparatus further includes a front end cover 40 and a rear end cover 50, the front end cover 40 is disposed at one end of the perforated pipe 10 located at the gas inlet 20, the rear end cover 50 is disposed at one end of the perforated pipe 10 located at the gas outlet 30, two ends of the outer cylinder 60 are respectively connected with the front end cover 40 and the rear end cover 50 in a sealing manner, and a closed cavity is formed between the perforated pipe 10, the outer cylinder 60, the front end cover 40 and the rear end cover 50. The good sealing connection enables the structure of the silencer to be more reliable, and the silencing effect is better.
Preferably, the diameter of the micro-perforation 101 is less than 1mm, the perforation rate is less than 6%, the diameter of the resonance cavity hole 102 is more than 2mm, and the perforation rate is 10% -15%.
The silencing effect of the silencing device provided by the embodiment is verified as follows:
the expression of the resonant frequency of the resonant cavity region 100 can be obtained according to newton's second law and the equation of state of the ideal gas:
Figure 127318DEST_PATH_IMAGE036
is like
In the first formula, the first reaction solution is,
Figure DEST_PATH_IMAGE037
in order to be the speed of sound,
Figure DEST_PATH_IMAGE039
is the cross section area of the small hole,
Figure 952317DEST_PATH_IMAGE040
in order to have a closed cavity volume,
Figure 886775DEST_PATH_IMAGE006
，
Figure DEST_PATH_IMAGE041
the length of the small hole is the length of the small hole,
Figure DEST_PATH_IMAGE043
to correct for when the diameter of the circular hole is
Figure 40325DEST_PATH_IMAGE016
When the temperature of the water is higher than the set temperature,
Figure 325813DEST_PATH_IMAGE044
，
Figure DEST_PATH_IMAGE045
is the effective length of the aperture. As can be seen from the above equation, the resonant frequency is related to the volume of the resonant cavity region 100, the sectional area and the effective length of the resonant cavity hole 102, and in the present embodiment, the resonant cavity region 100 is designed to have a variable sectional structure, and the resonant frequency point is increased by different depths in the cavity, so as to achieve the noise reduction effect in a wider frequency band range.
Further, for the structure of the micro-perforation hole 101, according to a micro-perforated plate acoustic impedance theoretical model of malar \29495, the expression of the relative acoustic impedance is as follows:
Figure 390721DEST_PATH_IMAGE011
formula II
In the second formula, the first and second groups are,
Figure 445265DEST_PATH_IMAGE012
which represents the relative sound resistivity of the sound,
Figure 406268DEST_PATH_IMAGE013
the relative acoustic reactance rate is expressed in terms of,
Figure 913472DEST_PATH_IMAGE046
formula III
Figure DEST_PATH_IMAGE047
Formula IV
In the formula III and the formula IV,
Figure 283536DEST_PATH_IMAGE009
in order to be able to measure the diameter of the micro-perforations 101,
Figure 458165DEST_PATH_IMAGE017
the number of the holes is the perforation rate,
Figure 324490DEST_PATH_IMAGE019
in order to provide a depth for the micro-perforations 101,
Figure 850149DEST_PATH_IMAGE020
constant of microperforated plate for coefficient of air kinematic viscosity
Figure 460122DEST_PATH_IMAGE048
，
Figure DEST_PATH_IMAGE049
For incident wavesFrequency.
Specific acoustic impedance of the cavity
Figure 784531DEST_PATH_IMAGE023
Comprises the following steps:
Figure 821757DEST_PATH_IMAGE024
formula five
In the fifth step, the first step is carried out,
Figure 569133DEST_PATH_IMAGE050
is the cavity depth;
the relative specific acoustic impedance of the structure of the micro-perforation 101 can be obtained by combining the first to the fifth
Figure DEST_PATH_IMAGE051
Comprises the following steps:
Figure 45114DEST_PATH_IMAGE028
formula six
According to the classic microperforated plate theory presented by massachusetts 29495the sound absorption coefficient of the microperforated region 90 can be obtained
Figure 928756DEST_PATH_IMAGE052
Comprises the following steps:
Figure DEST_PATH_IMAGE053
formula seven
Alternatively, the sound absorbing structure sound absorption reactance of the micro-perforated region 90 is 0 when resonance occurs, at which point the maximum sound absorption coefficient is
Figure 435086DEST_PATH_IMAGE031
Comprises the following steps:
Figure 669759DEST_PATH_IMAGE032
type eight
Absorption peak resonant frequency
Figure 621534DEST_PATH_IMAGE033
The following equation is satisfied:
Figure 625262DEST_PATH_IMAGE034
nine-degree of expression
The sound absorption coefficient is the maximum sound absorption coefficient
Figure 4291DEST_PATH_IMAGE031
The frequency of half of the time satisfies the following equation:
Figure 726259DEST_PATH_IMAGE035
the formula is ten.
It can be seen from the equation ten that the resonant frequency of the micro-perforated region 90 is also related to the cavity depth, and a wider noise reduction frequency band is also achieved by changing the cavity depth. When the high-pressure gas passes through the silencer, the resonant cavity region 100 reduces the noise of low frequency noise, the micro-perforated region 90 reduces the noise of medium and high frequency noise in the gas, the variable cross section design of the silencer realizes the broadband noise reduction effect of low, medium and high frequency noise of the high-pressure gas, the water outlet 70 realizes the water drainage function, and the arrangement of the water outlet in the micro-perforated region 90 does not damage the resonant cavity structure of the resonant cavity region 100, so that the noise reduction effect is greatly reduced.
The embodiment also provides a fuel cell system, which comprises the fuel cell silencing device in any technical scheme.
Compared with the prior art, in the fuel cell silencing device and the fuel cell system provided by the embodiment, the resonant cavity region 100 is a resonant cavity consisting of the perforated pipe 10 with the plurality of resonant cavity holes 102, the outer cylinder 60 and the partition plate 80, the resonant cavity holes 102 and the resonant cavity form an elastic vibration system, and gas sound energy is converted into heat energy through resonance and air column friction, so that the elastic vibration system is used for reducing the noise of low-frequency exhaust noise of the fuel cell; the micro-perforated area 90 is composed of a plurality of micro-perforations 101, the outer cylinder body 60 and the partition plate 80, when high-pressure gas passes through the micro-perforations 101, the vibration of gas particles generates viscous force and frictional resistance to convert gas sound energy into heat energy, the noise reduction effect is achieved, the gas resistance is small, the airflow regeneration noise is low, and the noise reduction device is suitable for reducing high-frequency noise in fuel cell exhaust.
In the embodiment, the resonance cavity hole 102 and the micro-perforation hole 101 are connected in parallel, and the variable cross-section structural design is adopted to realize noise reduction of low-frequency, medium-frequency and high-frequency sound, so that silencing in a wider frequency band is achieved, the performance of a hydrogen fuel cell engine product is improved, a fuel cell system needs to be drained, the problem that the durability of a silencing device is reduced due to silencing by adopting a resistive filling material is avoided, meanwhile, silencing in a wide frequency band can be realized by adopting one silencing device, and the system arrangement can be simplified.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A fuel cell silencing apparatus, comprising:
the gas inlet and outlet structure comprises a perforated pipe (10), wherein one end of the perforated pipe (10) is a gas inlet (20), the other end of the perforated pipe is a gas outlet (30), a first area surface of the perforated pipe (10) is provided with micro perforations (101) along the radial direction, and a second area surface of the perforated pipe (10) is provided with resonance cavity holes (102) along the radial direction;
the outer cylinder body (60) is arranged on the periphery of the perforated pipe (10), and a closed cavity is formed between the inner side of the outer cylinder body (60) and the outer side of the perforated pipe (10);
a baffle (80), said baffle (80) disposed between said perforated tube (10) and said outer cylinder (60) and isolating said microperforations (101) from said resonant cavity holes (102);
the first region outer surface of the perforated tube (10), the outer cylinder (60) and the separator plate (80) form a microperforated region (90), and the second region outer surface of the perforated tube (10), the outer cylinder (60) and the separator plate (80) form a resonance cavity region (100).
2. The fuel cell silencing device according to claim 1, wherein the first region where the micro-perforations (101) are located is provided with a drain opening (70) below the outer cylinder (60).
3. The fuel cell silencing apparatus according to claim 1, wherein the outer cylinder (60) has a circular truncated cone shape, and a diameter near the gas inlet (20) is smaller than a diameter near the gas outlet (30).
4. The fuel cell silencing device according to claim 3, further comprising a front end cover (40) and a rear end cover (50), wherein the front end cover (40) is disposed at one end of the perforated pipe (10) located at the gas inlet (20), the rear end cover (50) is disposed at one end of the perforated pipe (10) located at the gas outlet (30), two ends of the outer cylinder (60) are respectively connected with the front end cover (40) and the rear end cover (50) in a sealing manner, and a closed cavity is formed among the perforated pipe (10), the outer cylinder (60), the front end cover (40) and the rear end cover (50).
5. The fuel cell silencing device according to claim 1, wherein the micro-perforations (101) have a diameter of less than 1mm and a perforation rate of less than 6%.
6. The fuel cell silencing apparatus according to claim 5, wherein the resonance chamber hole (102) has a diameter of more than 2mm and a perforation rate of 10-15%.
7. The fuel cell silencing device according to any of the claims 1-6, wherein the expression of the resonance frequency of the resonance cavity region (100) is obtained according to Newton's second law and the ideal gas state equation:
Figure DEST_PATH_IMAGE001
is like
In the first formula, the first reaction solution is,
Figure 798113DEST_PATH_IMAGE002
in order to be the speed of sound,
Figure 673665DEST_PATH_IMAGE004
is the cross section area of the small hole,
Figure DEST_PATH_IMAGE005
in order to seal the volume of the cavity,
Figure 735424DEST_PATH_IMAGE006
，
Figure DEST_PATH_IMAGE007
the length of the small hole is the length of the small hole,
Figure 100547DEST_PATH_IMAGE008
to correct the value when the diameter of the circular hole is
Figure DEST_PATH_IMAGE009
When the temperature of the water is higher than the set temperature,
Figure 379081DEST_PATH_IMAGE010
is the effective length of the aperture.
8. The fuel cell silencing device of claim 7, wherein the relative specific acoustic impedance is expressed according to a microperforated panel acoustic impedance theoretical model of Madamard \29495:
Figure DEST_PATH_IMAGE011
formula II
In the second formula, the first and second groups are,
Figure 93877DEST_PATH_IMAGE012
which represents the relative sound resistivity of the sound,
Figure DEST_PATH_IMAGE013
the relative acoustic reactance rate is expressed in terms of,
Figure 508678DEST_PATH_IMAGE014
formula III
Figure DEST_PATH_IMAGE015
Formula IV
In the third formula and the fourth formula,
Figure 779122DEST_PATH_IMAGE016
the diameter of the micro-perforation (101),
Figure DEST_PATH_IMAGE017
the number of the holes is the perforation rate,
Figure DEST_PATH_IMAGE019
is the depth of the micro-perforation (101),
Figure 843156DEST_PATH_IMAGE020
constant of microperforated plate for coefficient of air kinematic viscosity
Figure DEST_PATH_IMAGE021
，
Figure 326090DEST_PATH_IMAGE022
In order to be the frequency of the incident wave,
specific acoustic impedance of the cavity
Figure DEST_PATH_IMAGE023
Comprises the following steps:
Figure 860976DEST_PATH_IMAGE024
formula five
In the fifth step, the first step is carried out,
Figure DEST_PATH_IMAGE025
is the cavity depth;
the relative specific acoustic impedance of the micro-perforated structure can be obtained by combining the first to the fifth
Figure DEST_PATH_IMAGE027
Comprises the following steps:
Figure 332015DEST_PATH_IMAGE028
formula six
According to the classic microperforated plate theory proposed by massauda 29495
Figure DEST_PATH_IMAGE029
Comprises the following steps:
Figure 585142DEST_PATH_IMAGE030
and a seventh formula.
9. The fuel cell silencing apparatus of claim 8, wherein the sound absorbing structure sound absorption resistance of the microperforated region (90) is 0 when resonance occurs, and the maximum sound absorption coefficient is at that time
Figure DEST_PATH_IMAGE031
Comprises the following steps:
Figure 871767DEST_PATH_IMAGE032
type eight
Absorption peak resonant frequency
Figure DEST_PATH_IMAGE033
The following equation is satisfied:
Figure 497046DEST_PATH_IMAGE034
nine-degree of expression
The sound absorption coefficient is the maximum sound absorption coefficient
Figure 578134DEST_PATH_IMAGE031
Satisfies the following equation:
Figure DEST_PATH_IMAGE035
the formula is ten.
10. A fuel cell system comprising the fuel cell silencing apparatus according to any one of claims 1 to 9.
CN202222905453.1U 2022-11-02 2022-11-02 Fuel cell silencing device and fuel cell system Active CN218632125U (en)

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