CN214847711U - Silencer of jet engine - Google Patents

Abstract

The utility model discloses a jet engine's silencing device, including the amortization barrel, the amortization barrel is including enclosing into the acoustical panel of tube-shape and surrounding and surround at acoustical panel circumference outlying sound absorption filling layer, the acoustical panel on seted up a plurality of bloops, and the inner wall of acoustical panel on still be provided with water conservancy diversion piece, water conservancy diversion piece along the axial extension of tube-shape acoustical panel, and water conservancy diversion piece is provided with a plurality of at the interval of tube-shape acoustical panel in week. Jet engine's silencing device can ensure that the air current passes through smoothly with discharging, the outdoor start environment of simulation, the processing of making an uproar falls when not influencing the test, guarantee test accuracy adopts the compound means of making an uproar that falls, and the air that high-speed tail flame formed when effectively reducing the engine test vibrates the noise, protects all ring edge borders, and the guarantee personnel are healthy, the guarantee test security.

Description

Silencer of jet engine

Technical Field

The utility model relates to a noise treatment technical field especially relates to a jet engine's silencing device.

Background

Jet engine during operation can produce a large amount of high temperature, high-pressure efflux, and its rear portion can not have the obstacle to produce the resistance, need ensure the smooth and easy nature of ventilation and just can ensure the test accuracy, and jet engine can cause the injury to test operating personnel because high rotational speed, high thrust also can produce high decibel noise simultaneously, consequently need carry out noise reduction. The existing silencer is difficult to well guide airflow, the airflow passing state is difficult to approach to an outdoor starting environment, whether the simulation outdoor environment is met is an important condition for guaranteeing the test accuracy, and the existing silencer is easy to deform and damage due to high-temperature and high-pressure jet flow generated by the jet engine, so that the service life is short.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve and the technical task that provides improve prior art, provide a jet engine's silencing device, be difficult to among the solution prior art to carry out effective amortization noise reduction to jet engine, to the big problem of peripheral environment, personnel's harmful effects.

For solving the above technical problem, the technical scheme of the utility model is that:

the utility model provides a jet engine's silencing device, includes the amortization barrel, the amortization barrel is including enclosing into the acoustical panel of tube-shape and surrounding at acoustical panel circumference outlying and inhale the sound filling layer, the acoustical panel on seted up a plurality of bloops, and the inner wall of acoustical panel on still be provided with the water conservancy diversion spare, the water conservancy diversion spare extend along the axial of tube-shape acoustical panel, and the water conservancy diversion spare is provided with a plurality of at the interval in the circumference of tube-shape acoustical panel. The utility model discloses a jet engine's silencing device whole be the barrel structure that the air current can pass through, can not produce the air current and block, realize big through-flow, make the air current pass through the state and be close to jet engine at outdoor start-up environment, guarantee that the tail flame and the hot gas flow of engine test can be effectual discharges smoothly, guarantee the test accuracy, adopt the acoustical panel that has the micropore, select different aperture ratios, board thickness etc. can control silencing device's spectral performance, make it obtain good noise cancelling effect in the frequency range that needs, that is to say, can select the aperture ratio of acoustical panel, board thickness isoparametric according to the main frequency of actual engine, the effect of direction is played to the air current to the water conservancy diversion piece simultaneously, enable the turbulent flow to become steady laminar flow, thereby reduce the produced noise of turbulent flow, and inhale the further improvement noise reduction effect of sound filling layer, through the reflection of innumerable fibre, superpose each other, collision when inhaling the sound filling layer, the sound wave energy conversion heat energy to make sound intensity weaken and even sound disappears, this application adopts compound noise reduction means, and the air that high-speed tail flame formed when effectively reducing the engine test vibrates the noise, protects all ring edge borders, and the guarantee personnel are healthy.

Furthermore, the water conservancy diversion spare for buckling into angular scute to the most advanced one side of scute is towards the radial inboard in tube-shape acoustical panel, simple structure, and it is convenient to implement, and the chaotic noise of air current is bigger more, and the water conservancy diversion spare can play good guide effect to the turbulent flow, makes the air current become more smooth-going, thereby the noise reduction.

Furthermore, a plurality of through holes are formed in the flow guide piece, the flow guide piece has the same effect as the sound absorption plate with the micropores, and the sound absorption effect is achieved while the flow guide piece conducts flow.

Furthermore, the interval of the flow guide pieces in the circumferential direction of the cylindrical sound-absorbing plate is increased along with the increase of the flow velocity of the air flow, when the flow velocity of the air flow is larger, the larger the interval of the flow guide pieces is, the better the flow guide effect on the air flow is, the turbulent flow can be changed into stable laminar flow, and if the flow velocity of the air flow is large and the interval of the flow guide pieces is too small, the adjacent flow guide pieces are smooth surfaces to the air flow, and a good flow guide effect cannot be achieved.

Further, inhale sound filling layer including the sound absorption layer two that is located radial inboard and is located radial outside, sound absorption layer one adopts high temperature resistant fiber material to make, because jet engine can produce a large amount of high temperature, high-pressure efflux, adopts high temperature resistant fiber material can bear high temperature, high-pressure efflux, can play the guard action to sound absorption layer two, increase of service life ensures good sound absorption and falls the performance of making an uproar.

Further, sound absorbing layer two adopts the fibrous material that the unit weight reduces gradually to make along the air current direction in the axial of amortization barrel, different unit weights have different sound absorption characteristics, when thickness is unchangeable, when the unit weight increases, low frequency sound absorption coefficient will also constantly improve, and the unit weight is big more, sound absorbing layer two's structural stability is better, the unit weight of sound absorbing layer two who is close to engine place one end is bigger, can bear the pressure of the efflux that the engine said to produce more, service life is longer, adopt the structure that the unit weight changes gradually along the air current direction, can obtain bigger sound absorption effect.

Furthermore, the rollers are arranged on the silencing barrel, so that the mobility is improved, and the transfer and the transportation are facilitated.

Furthermore, still be provided with elevating system on the amortization barrel, conveniently adjust the height of amortization barrel in order to match different engines, use flexibility good, the scope is wide.

Further, the amortization barrel divide into a plurality of parts and become wholly with the amalgamation, and the weight of every part, the volume are relative all reduces, are convenient for transport, accomodate, also are convenient for maintain the change.

Further, the amortization barrel divide into two parts along its radial direction, the amortization barrel still divide into a plurality of sections along its axial, and simple structure easily assembles the combination and uses.

Compared with the prior art, the utility model discloses the advantage lies in:

jet engine's silencing device can ensure that the air current passes through smoothly with discharging, the outdoor start environment of simulation, the processing of making an uproar falls when not influencing the test, guarantee test accuracy adopts the compound means of making an uproar that falls, and the air that high-speed tail flame formed when effectively reducing the engine test vibrates the noise, protects all ring edge borders, and the guarantee personnel are healthy, the guarantee test security.

Drawings

FIG. 1 is a schematic end view of a jet engine muffler assembly;

fig. 2 is a schematic perspective view of a silencer of a jet engine.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses a jet engine's silencing device can more effectual water conservancy diversion air current, and guarantee air current smooth and easy nature can simulate outdoor start-up environment, and the accuracy of guarantee engine test effectively reduces the air vibration noise that high-speed tail flame formed, and noise cancelling effect is good, protects all ring edge borders, and the guarantee personnel are healthy, and is good to the high-pressure tolerance of high temperature, long service life.

As shown in fig. 1 and 2, a silencer of a jet engine mainly comprises a silencing cylinder 1, the silencing cylinder 1 may be a linear cylinder, the silencing cylinder 1 includes a silencing plate 2 surrounding a cylinder with a circular cross section and a sound-absorbing filling layer 3 surrounding the periphery of the silencing plate 2, the sound-absorbing filling layer 3 is further provided with a housing skeleton to ensure the stability of the whole structure of the silencing cylinder 1, the silencing plate 2 is provided with a plurality of silencing holes, when an air flow passes through the silencing holes, the frequency spectrum of air noise will move to high frequency or ultrahigh frequency to obviously reduce audible components in the frequency spectrum, thereby reducing the interference and damage to people, when the sound wave passes through the sound-absorbing filling layer, the sound wave is reflected, mutually superposed and collided by countless fibers to further absorb sound and reduce noise, and the inner wall of the silencing plate 2 is further provided with a flow guide member 4, the flow guide piece 4 extends along the axial direction of the cylindrical sound-absorbing board 2, a plurality of flow guide pieces 4 are arranged at intervals in the circumferential direction of the cylindrical sound-absorbing board 2, the flow guide pieces 4 protrude out of the inner surface of the cylindrical sound-absorbing board 2, the flow guide pieces 4 divide the circumferential direction of the cylindrical sound-absorbing board 2 into a plurality of areas, air flow passing through the sound-absorbing cylinder 1 is effectively guided, and turbulent flow is guided into stable laminar flow, so that noise is further reduced.

In this embodiment, the diversion member 4 is an angle plate bent into an angle shape, one side of the tip of the angle plate faces the radial inner side of the cylindrical sound-absorbing plate 2, a plurality of through holes are formed in the angle plate, the diversion member 4 not only plays a role in diversion of air flow, but also plays a role in noise reduction when the air flow passes through the through holes, the sound-absorbing plate 2 and the diversion member 4 are both made of high-temperature-resistant metal materials, the tolerance of high-temperature and high-pressure jet flow generated by an engine is improved, the service life is prolonged, and the sound-absorbing filling layer 3 is also supported and protected by the sound-absorbing plate 2 and the diversion member 4.

Different aperture ratios and plate thicknesses of the sound absorption plate 2 have different frequency spectrum properties, and parameters such as the aperture ratio and the plate thickness of the sound absorption plate can be selected according to the main frequency of an actual engine, specifically, the diameter of sound absorption holes in the sound absorption plate 2 is 3-5 mm, the distance between the sound absorption holes is 5-8 mm, and the diameter of the sound absorption holes can be preferably 5mm and the distance is 5 mm; the interval of the flow guide piece 4 in the circumferential direction of the cylindrical sound-absorbing board 2 is increased along with the increase of the air flow velocity, preferably, the interval of the flow guide piece 4 in the circumferential direction of the cylindrical sound-absorbing board 2 is 20-35 cm, and the turbulent flow is effectively changed into air oscillation noise formed by high-speed tail flame during the test of a stable laminar small engine.

In this embodiment, the sound absorption filling layer 3 includes a first sound absorption layer 31 located on the radial inner side and a second sound absorption layer 32 located on the radial outer side, the radial thickness of the second sound absorption layer 32 is greater than the first sound absorption layer 31, the first sound absorption layer 31 is made of high temperature resistant fiber material, specifically, ceramic fiber can be adopted, the high temperature resistance is good, the service life is long, the first sound absorption layer 31 plays a role in protecting the second sound absorption layer 32 while absorbing sound and reducing noise, the service life of the second sound absorption layer 32 is prolonged, the second sound absorption layer 32 is made of glass fiber, the second sound absorption layer 32 is made of fiber material with gradually reduced volume weight along the airflow direction in the axial direction of the sound absorption cylinder 1, and the volume weight range of the second sound absorption layer 32 is32～48kg/m³And a structure that the volume weight is gradually changed along the airflow direction is adopted, so that a larger sound absorption effect can be obtained.

The utility model discloses a noise reduction barrel, including amortization barrel 1, amortization barrel 1 is divided into two parts about with the amalgamation, and the weight of every part, the volume are relative all reduce, be convenient for transport, accomodate, it is specific, amortization barrel 1 divide into two parts about its radial direction, and amortization barrel 1 still divide into a plurality of sections along its axial, preferably three-section, the axial length of each section amortization barrel 1 is shorter, be convenient for shift the transportation, amalgamation constitutes the longer whole of axial length together, can fully cover the tail flame length that the engine produced, ensure to carry out effectual noise reduction treatment to the test of engine, it is preferable that each section amortization barrel 1 adopts the fibrous material of a volume weight size respectively in order to make sound-absorbing layer two 32, and the volume weight that each section amortization barrel 1 adopted fibrous material along the air current direction reduces in proper order, can obtain bigger sound absorption effect.

In order to improve the mobility, be provided with gyro wheel 5 on the amortization barrel 1 to still be provided with elevating system 6 on the amortization barrel 1 and test in order to adjust the different engine of amortization barrel 1 adaptation, specifically, gyro wheel 5 sets up in elevating system 6 bottom, and promptly, gyro wheel 5 is supporting amortization barrel 1 all the time, and amortization barrel 1 carries out altitude mixture control on gyro wheel 5.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims (10)

1. The utility model provides a jet engine's silencing device, characterized in that, includes amortization barrel (1), amortization barrel (1) including enclose into the acoustical panel (2) of tube-shape and surround and enclose at acoustical panel (2) circumference outlying inhale sound filling layer (3), acoustical panel (2) on seted up a plurality of bloops, and the inner wall of acoustical panel (2) on still be provided with water conservancy diversion spare (4), water conservancy diversion spare (4) along the axial extension of tube-shape acoustical panel (2), and water conservancy diversion spare (4) are provided with a plurality of at the interval in the circumference of tube-shape acoustical panel (2).

2. The jet engine silencer assembly according to claim 1, wherein the baffle member (4) is an angular plate bent at an angle, and a tip side of the angular plate faces a radially inner side of the tubular silencer plate (2).

3. The jet engine silencer device according to claim 2, wherein the baffle member (4) has a plurality of perforations.

4. The jet engine silencer assembly according to claim 1, wherein the spacing of the baffle elements (4) in the circumferential direction of the tubular silencer plate (2) increases with increasing gas flow velocity.

5. The jet engine silencer according to claim 1, wherein the sound absorbing filler layer (3) includes a first sound absorbing layer (31) located radially inside and a second sound absorbing layer (32) located radially outside, and the first sound absorbing layer (31) is made of a high temperature resistant fiber material.

6. The jet engine silencer according to claim 5, wherein the second sound absorbing layer (32) is made of a fiber material with gradually decreasing volume weight along the direction of air flow in the axial direction of the silencer cylinder (1).

7. The jet engine silencer device according to any of the claims 1 to 6, characterized in that rollers (5) are provided on the silencing cylinder (1).

8. The jet engine silencer according to any of claims 1 to 6, characterized in that the silencing cylinder (1) is further provided with a lifting mechanism.

9. The jet engine silencer device according to any of claims 1 to 6, characterized in that the silencing cylinder (1) is divided into several parts to be split into one piece.

10. The silencing apparatus for a jet engine according to claim 9, wherein the silencing cylinder (1) is divided into two parts along a radial direction thereof, and the silencing cylinder (1) is further divided into several sections along an axial direction thereof.

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