A test bench exhaust treatment device considering noise reduction

Abstract

The application provides a test bench tail gas treatment device with sound elimination, comprising: a tail gas treatment unit (3); the tail gas treatment unit (3) is arranged in an exhaust tower; the tail gas treatment unit (3) comprises a plurality of sound absorption unit cells and a plurality of catalytic unit cells, a plurality of porous sound absorption materials are arranged on the inner wall of the sound absorption unit cell, and a catalyst is filled in the catalytic unit cell. The tail gas of the aero-engine is simultaneously subjected to chessboard type sound elimination and catalysis, and one device can simultaneously reduce noise and decrease the exhaust concentration of the engine.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine testing, specifically relating to a test stand exhaust gas treatment device that also serves to reduce noise. Background Technology

[0002] When designing ground test stands for aero-engines, with the introduction of the national dual-carbon policy, the exhaust system of the test stand needs to consider the functions of noise reduction and emission compliance.

[0003] Existing aircraft engine test benches only consider exhaust gas treatment functions during testing.

[0004] Currently, there is no mature technology in the field of aero-engine test benches that can simultaneously address exhaust gas treatment and noise reduction. Summary of the Invention

[0005] This invention provides a test bench exhaust gas treatment device that combines noise reduction. It adopts a multi-layer checkerboard-style noise reduction and exhaust gas treatment module design method, providing a design concept for different types of test benches that can take into account both noise reduction and exhaust gas treatment.

[0006] The present invention provides a test bench exhaust gas treatment device that also reduces noise, comprising: an exhaust gas treatment unit 3;

[0007] The exhaust gas treatment unit 3 is installed inside the exhaust tower;

[0008] The exhaust gas treatment unit 3 includes multiple sound-absorbing cells and multiple catalyst cells. The inner wall of the sound-absorbing cells is arranged with porous sound-absorbing material, and the catalyst cells are filled with catalyst.

[0009] Optionally, the sound-absorbing cells and the catalytic cells are square with the same size. Catalytic cells are set on the front, back, left and right sides of each sound-absorbing cell, and sound-absorbing cells are set on the front left and right sides of each catalytic cell. The exhaust gas treatment unit 3 is in the shape of a chessboard.

[0010] Optionally, there may be multiple exhaust gas treatment units 3, each of which is arranged longitudinally within the exhaust tower.

[0011] Optionally, any two longitudinally adjacent exhaust gas treatment units 3 can be divided into a first exhaust gas treatment unit and a second exhaust gas treatment unit.

[0012] Sound-absorbing cells and catalytic cells are respectively installed at the same position in the first and second exhaust gas treatment units along the longitudinal direction.

[0013] Optionally, a first exhaust gas treatment unit and a second exhaust gas treatment unit are attached in parallel to form an exhaust gas treatment unit group, and each exhaust gas treatment unit group is arranged longitudinally in the exhaust tower with equal spacing.

[0014] Optionally, the minimum size of the sound-absorbing cell and the catalytic cell is 10cm x 10cm, and the interval between the two exhaust gas treatment unit groups is not less than 20cm.

[0015] Optionally, the dimensions of the exhaust gas treatment unit 3 are the same as the inner diameter of the exhaust tower.

[0016] Optionally, the catalyst within the catalytic cell is arranged in a honeycomb pattern.

[0017] This invention provides a test bench exhaust gas treatment device that also reduces noise. It utilizes a checkerboard-style silencing and catalytic converter to simultaneously treat the exhaust gas of an aero-engine. This single device can reduce noise and lower the concentration of engine exhaust gases. The modular design allows for easy assembly and is suitable for exhaust towers of various sizes. The silencing device designed using the method described in this invention allows for selection of the number of module layers based on the desired noise reduction. It can be designed as a standard type, ensuring good uniformity; it can also be mass-produced, improving the installation efficiency of test bench exhaust silencing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Schematic diagram of the exhaust gas treatment device for a test bench that also reduces noise, provided by the present invention. Figure 1 ;

[0020] Figure 2 Schematic diagram of the exhaust gas treatment device for a test bench that also reduces noise, provided by the present invention. Figure 2 ;

[0021] Figure 3 for Figure 2 A schematic diagram of the AA orientation of the cross section;

[0022] Figure 4 for Figure 2 A schematic diagram showing the BB orientation of the cross-section;

[0023] Figure 5 Schematic diagram of the exhaust gas treatment device for a test bench that also reduces noise, provided by the present invention. Figure 3 ;

[0024] Figure 6 A schematic diagram of the modular exhaust gas treatment unit provided by the present invention;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Catalyst;

[0027] 2-Porous sound-absorbing materials;

[0028] 3-Exhaust gas treatment unit. Detailed Implementation

[0029] The exhaust gas treatment device for test benches that also reduces noise, provided by the present invention, will be explained below with reference to the accompanying drawings.

[0030] Because aircraft engines have characteristics such as large flow rate, high flow velocity and wide sound frequency during ground testing, this invention combines strong noise reduction with the design principles of reactive and resistive mufflers to design a combined honeycomb catalyst engine exhaust purification device.

[0031] Reference Figure 1-6 The present invention provides a test bench exhaust gas treatment device that also reduces noise, comprising: exhaust gas treatment unit 3;

[0032] The exhaust gas treatment unit 3 is installed inside the exhaust tower;

[0033] The exhaust gas treatment unit 3 includes multiple sound-absorbing cells and multiple catalyst cells. The inner wall of the sound-absorbing cells is arranged with porous sound-absorbing material 2, and the catalyst cells are filled with catalyst 1.

[0034] Optionally, the sound-absorbing cells and the catalytic cells are square with the same size. Catalytic cells are set on the front, back, left and right sides of each sound-absorbing cell, and sound-absorbing cells are set on the front left and right sides of each catalytic cell. The exhaust gas treatment unit 3 is in the shape of a chessboard.

[0035] Optionally, there may be multiple exhaust gas treatment units 3, each of which is arranged longitudinally within the exhaust tower.

[0036] Optionally, any two longitudinally adjacent exhaust gas treatment units 3 can be divided into a first exhaust gas treatment unit and a second exhaust gas treatment unit.

[0037] Sound-absorbing cells and catalytic cells are respectively installed at the same position in the first and second exhaust gas treatment units along the longitudinal direction.

[0038] Optionally, a first exhaust gas treatment unit and a second exhaust gas treatment unit are attached in parallel to form an exhaust gas treatment unit group, and each exhaust gas treatment unit group is arranged longitudinally in the exhaust tower with equal spacing.

[0039] Optionally, the minimum size of the sound-absorbing cell and the catalytic cell is 10cm x 10cm, and the interval between the two exhaust gas treatment unit groups is not less than 20cm.

[0040] Optionally, the dimensions of the exhaust gas treatment unit 3 are the same as the inner diameter of the exhaust tower.

[0041] Optionally, the catalyst within the catalytic cell is arranged in a honeycomb pattern.

[0042] The exhaust gas treatment device for test benches that also reduces noise provided by this invention divides the cross-section of the exhaust tower into a chessboard, and the size of each chessboard can be designed according to the weight that can be transported during maintenance operations.

[0043] For example, the smallest chessboard unit (i.e., exhaust gas treatment unit 3) has four squares, with the catalyst and the sound-absorbing adsorption channels arranged adjacent to each other. One hole contains the catalyst, and the catalyst ratio is set according to the composition of the exhaust gas to be treated; the other hole contains porous sound-absorbing material.

[0044] The upper and lower chessboard units are separated by a cavity, which combines resistive and reactive noise reduction principles. While treating exhaust gas, it can also handle wide frequency range (high, medium and low) noise.

[0045] This invention arranges porous sound-absorbing materials in a checkerboard-shaped channel to achieve the effect of a resistive silencer; and achieves the effect of a reactive silencer through the abrupt change in the cross-section of the pipe between the two layers.

[0046] This invention combines strong noise reduction with the design principles of reactive and resistive mufflers, and also adds a honeycomb catalyst for purifying engine exhaust gases.

[0047] For example, such as Figure 5 and 6 As shown, the exhaust gas treatment unit 3 can be set as a modular chessboard unit, and multiple chessboard units can be spliced ​​together to fill the exhaust tower according to the actual size of the exhaust tower.

Claims

1. A test bench exhaust gas treatment device that also reduces noise, characterized in that, include: Exhaust gas treatment unit (3); The exhaust gas treatment unit (3) is installed inside the exhaust tower; The exhaust gas treatment unit (3) includes multiple sound-absorbing cells and multiple catalyst cells. The inner wall of the sound-absorbing cells is arranged with porous sound-absorbing material, and the catalyst cells are filled with catalyst. The sound-absorbing cells and the catalytic cells are square with the same size. Catalytic cells are set in front, behind, left and right of each sound-absorbing cell, and sound-absorbing cells are set in front, behind, left and right of each catalytic cell. The exhaust gas treatment unit (3) is in the shape of a chessboard. The number of exhaust gas treatment units (3) is multiple, and each exhaust gas treatment unit (3) is arranged longitudinally in the exhaust tower; Any two longitudinally adjacent exhaust gas treatment units (3) are divided into a first exhaust gas treatment unit and a second exhaust gas treatment unit. Sound-absorbing cells and catalytic cells are respectively installed at the same position in the first and second exhaust gas treatment units along the longitudinal direction; A first exhaust gas treatment unit and a second exhaust gas treatment unit are attached in parallel to form an exhaust gas treatment unit group. Each exhaust gas treatment unit group is arranged longitudinally in the exhaust tower and is spaced at the same interval. The minimum size of the sound-absorbing cell and the catalytic cell is 10cm x 10cm, and the interval between the two exhaust gas treatment unit groups is no less than 20cm.

2. The test bench exhaust gas treatment device according to claim 1, characterized in that, The dimensions of the exhaust gas treatment unit (3) are consistent with the inner diameter of the exhaust tower.

3. The test bench exhaust gas treatment device according to claim 1, characterized in that, The catalysts within the catalytic cell are arranged in a honeycomb pattern.

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