CN219122964U

CN219122964U - Tail jet tower type silencing system for jet plane ground test

Info

Publication number: CN219122964U
Application number: CN202223049913.1U
Authority: CN
Inventors: 屈靖; 张明镜
Original assignee: Sichuan Fangcun Intelligent Environment Technology Co ltd
Current assignee: Sichuan Fangcun Intelligent Environment Technology Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-06-02
Anticipated expiration: 2032-11-16

Abstract

The utility model discloses a tail jet flow tower type silencing system for jet aircraft ground surface test, which comprises a silencing channel section, an anti-silencing section and a sheet type silencing section which are sequentially connected, wherein the inlet end of the silencing channel section is used for jetting tail of a jet aircraft, the tail end of the silencing channel section is connected with the anti-silencing section, the cross section area of the anti-silencing section is larger than that of the silencing channel section, a plurality of parallel spaced sound insulation plates are arranged in the sheet type silencing section, and an exhaust channel is formed between every two adjacent sound insulation plates. The tail jet tower type noise reduction system for jet plane ground surface test adopts a multistage noise reduction treatment structure, has good noise reduction effect, and effectively reduces the adverse effect of high-temperature and high-pressure tail flame airflow generated by jet plane tail jet on the surrounding environment.

Description

Tail jet tower type silencing system for jet plane ground test

Technical Field

The utility model relates to the technical field of silencing devices, in particular to a tail jet tower type silencing system for ground testing of a jet aircraft.

Background

The test of jet plane is usually carried out in open air, there is no silencer aiming at jet plane in the prior art, and huge airflow noise generated by tail jet of jet plane has serious influence on surrounding environment and personnel, so the potential safety hazard is large.

Disclosure of Invention

The utility model aims to solve the technical problems and the technical task of improving the prior art, provides a tail jet tower type silencing system for jet plane ground test, and solves the problem that the noise of the air flow of the jet plane has serious influence on the surrounding environment and personnel in the prior art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the utility model provides a jet plane ground test is with tower silencing system of tail jet, includes the amortization passageway section that connects gradually, anti formula amortization section and piece formula amortization section, the tail of jet plane is just spouted to the entry end of amortization passageway section, the end connection anti formula amortization section of amortization passageway section, anti formula amortization section's cross-sectional area is greater than the cross-sectional area of amortization passageway section, be provided with a plurality of parallel spaced acoustic celotex boards in the piece formula amortization section, constitute exhaust passage between the adjacent acoustic celotex board. The tail jet flow tower type silencing system for jet plane ground surface test firstly utilizes the silencing channel section to introduce tail flame airflow generated by jet plane tail jet, the silencing channel section performs first-stage silencing and noise reduction treatment on the tail flame airflow, then the airflow enters the anti-silencing section, the cross section area of the anti-silencing section is larger than that of the silencing channel section, namely the cross section is suddenly changed to cause impedance change to generate reflection and interference of sound energy, so that the outward radiated sound energy is reduced, the silencing purpose is achieved, the anti-silencing section also enables the pressure drop generated by the airflow to be larger, then the airflow enters the sheet type silencing section, the parallel-spaced sound insulation plates in the sheet type silencing section perform effective energy dissipation, the kinetic energy of high-speed airflow is greatly reduced, the airflow is discharged outwards from a plurality of exhaust channels to relieve pressure, the silencing and noise reduction effects are further improved, and the adverse effects of the high-temperature high-pressure tail flame airflow generated by jet plane tail jet on the surrounding environment are effectively reduced.

Further, the exhaust direction of the exhaust channel formed between the adjacent sound insulation plates forms an included angle with the length direction of the silencing channel section, so that the airflow direction is changed, the flow speed of tail flame airflow generated by tail jet of the jet aircraft can be reduced, and the reduction is realized.

Further, the exhaust direction of the exhaust channel formed between the adjacent sound insulation plates is vertical upwards, so that the exhausted airflow faces the sky direction, the influence on the surrounding environment is reduced to the greatest extent, and the situation that the exhaust direction is arranged in the transverse direction, personnel, equipment and the like enter the outlet of the exhaust channel by mistake to generate a safety accident is avoided.

Further, be provided with between piece formula amortization section and the anti formula amortization section with the air current is guided to exhaust passage's guiding mechanism for the air current can be smoothly got into piece formula amortization section and finally discharge, avoid piece formula amortization section body receives too big impact and impaired, reduces maintenance cost.

Furthermore, the flow guiding mechanism is a pier body with an inclined plane facing the wind, has high structural strength and good stability, can well withstand the impact of tail flame airflow generated by tail jet of the jet aircraft, and has long service life and stable flow guiding function.

Further, the sheet type silencing section comprises a plurality of groups of parallel spaced acoustic baffles which are arranged along the exhaust direction of the exhaust channel at intervals, a resistance silencing section is formed between adjacent groups, the parallel spaced acoustic baffles play an effective role in dissipating energy, the kinetic energy of high-speed air flow is greatly reduced, the section of the exhaust channel formed between the adjacent acoustic baffles is smaller, the resistance silencing section between the adjacent groups also forms a sudden change in section, and therefore impedance is changed to generate reflection and interference of acoustic energy, the acoustic energy radiated outwards is reduced, and the silencing effect is better improved.

Furthermore, the surface of the sound insulation plate is of a porous structure, and the different opening ratios and plate thicknesses can control the sound-deadening spectral performance, so that a good sound-deadening effect is obtained in a required frequency range.

Furthermore, the silencing channel section is formed by splicing a plurality of sections divided along the length direction of the silencing channel section, the silencing channel section with the required length can be flexibly selected according to the requirement, the silencing channel section is formed by splicing left and right parts divided along the diameter direction of the cross section of the silencing channel section, and the splicing structure is adopted, so that the weight and the volume of each component are relatively small, the conveying and the storage are convenient, and the maintenance and the replacement are also convenient.

Further, the wall surface of amortization passageway section is from interior to outside amortization barrel board, sound absorption filling layer and the shell body that sets gradually, a plurality of amortization holes have been seted up to amortization barrel board, can select parameters such as aperture ratio, the board thickness of amortization board according to actual engine's main frequency, and sound absorption filling layer is further improved noise reduction effect, and sound wave passes through countless fibrous reflection, mutual stack, collision when filling the layer of sound absorption, and sound wave energy turns into heat energy to make sound wave intensity weaken and even sound disappear.

Further, the inner wall of the silencing barrel plate is also provided with the guide strips extending along the length direction of the silencing channel section, the guide strips are arranged at intervals along the circumferential direction of the silencing barrel plate, the guide strips play a role in guiding air flow, and the turbulent flow can be changed into stable laminar flow, so that noise generated by the turbulent flow is reduced.

Compared with the prior art, the utility model has the advantages that:

the tail jet flow tower type noise reduction system for the jet type aircraft ground surface test adopts a multistage noise reduction treatment structure, has good noise reduction effect, can not block tail jet flow of the jet type aircraft, has an effective guiding effect on the tail jet flow by the noise reduction channel section, ensures that the tail jet flow can be effectively and smoothly discharged, and generates reflection and interference of sound energy due to impedance change caused by abrupt change of the section of the anti-noise reduction section, so that the sound energy radiated outwards is reduced, the sheet type noise reduction section has an effective energy dissipation effect, the kinetic energy of high-speed airflow is greatly reduced, and the adverse effect on the surrounding environment caused by high-temperature and high-pressure tail flame airflow generated by jet tail of the jet type aircraft is effectively reduced.

Drawings

FIG. 1 is a schematic overall view of a tail jet tower muffler system for a jet aircraft floor test of the present utility model;

FIG. 2 is an internal schematic view of a tail jet tower muffler system for a jet aircraft ground test in accordance with the present utility model;

FIG. 3 is a schematic side cross-sectional view of a tail jet tower muffler system for use in ground testing of a jet aircraft in accordance with the present utility model;

fig. 4 is a schematic cross-sectional structure of the sound deadening passageway segment.

In the figure:

the sound-absorbing structure comprises a sound-absorbing channel section 1, a sound-absorbing cylinder plate 11, a sound-absorbing filling layer 12, an outer shell 13, a flow guide strip 14, a resistance sound-absorbing section 2, a sheet sound-absorbing section 3, a sound-insulating plate 31, a resistance sound-absorbing section 32 and a flow guide mechanism 4.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The embodiment of the utility model discloses a tail jet tower type silencing system for jet plane ground test, which has a simple and compact structure, can effectively reduce the kinetic energy of high-speed air, has a good noise reduction effect, and avoids the adverse effect of noise on the surrounding environment and personnel.

As shown in fig. 1 to 4, a tail jet tower type silencing system for a jet plane ground test mainly comprises a silencing channel section 1, an anti-silencing section 2 and a sheet type silencing section 3 which are sequentially connected, wherein the silencing channel section 1 is a straight cylindrical channel piece, the inlet end of the silencing channel section 1 is opposite to the tail jet of the jet plane, the tail end of the silencing channel section 1 is connected with the anti-silencing section 2, the cross section area of the anti-silencing section 2 is larger than that of the silencing channel section 1, a plurality of parallel spaced sound insulation plates 31 are arranged in the sheet type silencing section 3, and an exhaust channel is formed between every two adjacent sound insulation plates 31.

The noise reduction channel section 1 is a channel structure capable of smoothly passing air flow, and can not block the air flow, so that large through flow can be realized, the air flow passing state at the tail jet position of the jet aircraft is close to an outdoor environment without any shielding, the tail jet flow can be ensured to be smoothly discharged, further the test accuracy is ensured, the tail jet flow is guided into the anti-noise reduction section 2 through the noise reduction channel section 1, the cross section area of the anti-noise reduction section 2 is larger than the cross section area of the noise reduction channel section 1, the cross section mutation causes impedance change, further the reflection and interference of sound energy are caused, the sound energy radiated outwards is effectively reduced, and the noise reduction purpose is achieved, then the air current reenters in the piece formula amortization section 3, and parallel spaced acoustic celotex board 31 plays effectual energy dissipation effect in the piece formula amortization section, very big reduction high-speed air current's kinetic energy to acoustic celotex board 31 is resistive noise elimination device, acoustic celotex board 31 surface is porous structure, propagates in porous sound absorbing material or sound absorbing structure with the sound wave, and the sound energy is converted into heat energy and gives off because of the friction, makes the noise along the pipeline propagation attenuate along with the distance to reach the noise elimination purpose, finally the air current outwards discharges from the exhaust passage between the adjacent acoustic celotex board, and the air that tail flame air current formed shakes noise when effectively reducing the engine test protects surrounding environment, ensures personnel's health.

In this embodiment, the noise reduction channel section 1 is mainly a resistive noise reduction device, the wall surface of the noise reduction channel section 1 is sequentially provided with a noise reduction tube plate 11, a sound absorption filling layer 12 and an outer shell 13 from inside to outside, the noise reduction tube plate 11 is provided with a plurality of noise reduction holes, when the air flow passes through the noise reduction holes, the frequency spectrum of the air noise will move to high frequency or ultrahigh frequency, so that the audible sound component in the frequency spectrum is obviously reduced, interference and injury to people are reduced, the sound wave passes through reflection, mutual superposition and collision of innumerable fibers when passing through the sound absorption filling layer, further sound absorption and noise reduction are further carried out, the inner wall of the noise reduction tube plate 11 is also provided with a guide strip 14 extending along the length direction of the noise reduction channel section 1, the guide strip 14 is provided with a plurality of guide strips along the circumferential direction interval of the noise reduction tube plate 11, the guide strip 14 protrudes out the inner surface of the noise reduction tube plate 11, the guide strip 14 separates the circumference of the noise reduction tube plate 11 into a plurality of areas, so that the air flow passing through the noise reduction channel section 1 is effectively guided, and the turbulent flow is smoothly and the laminar noise is further reduced.

And, the amortization passageway section 1 is formed by a plurality of sections amalgamations of dividing along its length direction, and amortization passageway section 1 is formed by dividing left and right sides two parts amalgamations along the diameter direction of its cross section, and the weight, the volume of every component are less relatively, are convenient for transport, accomodate, can be convenient carry out amalgamation installation, can adjust as required the length of amortization passageway section 1.

In this embodiment, the exhaust direction of the exhaust channel formed between the adjacent sound insulation plates 31 forms an included angle with the length direction of the sound insulation channel section 1, specifically a right angle, preferably, the exhaust direction of the exhaust channel formed between the adjacent sound insulation plates 31 is vertically upward, that is, the axial direction of the sound insulation channel section 1 is along the horizontal ground direction, and the exhaust direction of the exhaust channel formed between the adjacent sound insulation plates 31 is oriented to the sky direction, so that the air flow enters the sheet type sound insulation section 3 from the anti-noise section 2 and changes in direction, which is beneficial to reducing the kinetic energy of the air flow, thereby being beneficial to reducing the noise, but the tail flame air flow generated by the jet aircraft tail jet has high temperature, fast flow speed and larger impact force, if the air flow steering is performed by directly using the wall surface of the tail jet tower type sound insulation system for the ground test of the jet aircraft, in this embodiment, a guiding mechanism 4 for guiding the airflow to the exhaust channel is disposed between the sheet type silencing section 3 and the anti-silencing section 2, specifically, the guiding mechanism 4 is a pier body with an inclined surface facing the wind, that is, one side of the pier body facing the silencing channel section 1 is an inclined surface, the inclined surface guides the airflow entering the anti-silencing section 2 upwards, so that the airflow smoothly enters the sheet type silencing section 3, the pier body is built on the ground, the whole body is in a trapezoid structure, the structural stability is good, the strength is good, the exhaust airflow generated by the jet type aircraft tail spray can be well tolerated, the service life is long, the maintenance cost is reduced, and the airflow can be well guided into the sheet type silencing section 3, the condition that backflushing is blocked to the tail flame airflow generated by tail spraying of the jet aircraft can be avoided, the airflow passing state is ensured to be close to the outdoor starting environment of the jet engine, and the testing accuracy is ensured.

In this embodiment, the sheet-type sound-deadening segment 3 includes several groups of parallel-spaced sound-deadening plates 31 that are disposed at intervals along the exhaust direction of the exhaust channel, and a resistive sound-deadening segment 32 is formed between adjacent groups, as shown in fig. 2, two groups of parallel-spaced sound-deadening plates 31 are disposed at intervals in the height direction, the resistive sound-deadening segment 32 is disposed between two groups of parallel-spaced sound-deadening plates 31, the sound-deadening plates 31 are resistive sound-deadening devices, so that sound can be effectively absorbed and reduced, and air flow enters the resistive sound-deadening segment 32 from the exhaust channel between adjacent sound-deadening plates 31, and the resistance is changed due to abrupt change of the section, so that reflection and interference of sound energy are caused, and the sound-deadening and noise-reducing effects are further improved.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the utility model, and the scope of the utility model should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.

Claims

1. The utility model provides a jet plane ground test is with tower noise abatement system of tail jet, its characterized in that, including noise reduction passageway section (1), anti-formula noise reduction section (2) and the piece formula noise reduction section (3) that connect gradually, the entry end of noise reduction passageway section (1) is just to the tail of jet plane and spouts, the end connection anti-formula noise reduction section (2) of noise reduction passageway section (1), the cross-sectional area of anti-formula noise reduction section (2) is greater than the cross-sectional area of noise reduction passageway section (1), be provided with a plurality of parallel interval's acoustic celotex board (31) in piece formula noise reduction section (3), constitute exhaust passage between adjacent acoustic celotex board (31).

2. Tail jet tower noise abatement system for jet aircraft floor tests according to claim 1, characterized in that the exhaust direction of the exhaust channel formed between adjacent acoustic baffles (31) is at an angle to the length direction of the noise abatement channel section (1).

3. Tail jet tower muffler system for jet aircraft ground test according to claim 2, characterized in that the exhaust direction of the exhaust channel formed between adjacent acoustic baffles (31) is vertically upwards.

4. Tail jet tower muffler system for jet aircraft ground testing according to claim 2, characterized in that between the lamellar muffler section (3) and the anti-muffler section (2) a flow guiding mechanism (4) is provided which guides the air flow to the exhaust channel.

5. The tail jet tower noise abatement system for jet aircraft floor testing according to claim 4, wherein the deflector mechanism (4) is a pier having an inclined surface facing the wind.

6. Tail jet tower muffler system for jet aircraft ground testing according to claim 1, characterized in that the said sheet muffler section (3) comprises several parallel groups of spaced acoustic baffles (31) spaced along the exhaust direction of the exhaust channel, adjacent groups constituting resistant muffler sections (32).

7. The tail jet tower muffler system for jet aircraft floor testing as claimed in claim 1, wherein the baffle (31) surface is porous.

8. Tail jet tower noise abatement system for jet aircraft ground test according to claim 1, characterized in that the noise abatement channel section (1) is split by several sections divided along its length direction and the noise abatement channel section (1) is split by two parts divided left and right along its cross-section diameter direction.

9. The tail jet tower type silencing system for jet plane ground test according to claim 1, wherein the wall surface of the silencing channel section (1) is provided with a silencing barrel plate (11), a sound absorbing filling layer (12) and an outer shell (13) in sequence from inside to outside, and the silencing barrel plate (11) is provided with a plurality of silencing holes.

10. The tail jet tower type silencing system for a jet aircraft ground test as recited in claim 9, wherein a plurality of guide strips (14) extending along the length direction of the silencing channel section (1) are further arranged on the inner wall of the silencing cylinder plate (11), and the guide strips (14) are arranged at intervals along the circumferential direction of the silencing cylinder plate (11).