CN104405530B - Separately gas-discharging type turbofan engine exhausting and denoising system - Google Patents
Separately gas-discharging type turbofan engine exhausting and denoising system Download PDFInfo
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- CN104405530B CN104405530B CN201410546732.0A CN201410546732A CN104405530B CN 104405530 B CN104405530 B CN 104405530B CN 201410546732 A CN201410546732 A CN 201410546732A CN 104405530 B CN104405530 B CN 104405530B
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- intension
- cyclone separator
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- outer culvert
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Abstract
A kind of separately gas-discharging type turbofan engine exhausting and denoising system, belongs to aeroengine exhaust system design and exhausting and denoising technical field.It is characterized in that: exhausting and denoising system is by outer culvert outer wall (1), outer culvert cyclone separator (2), outer culvert internal face (3), intension cyclone separator (4), exhaust rectification inner cone (5), outer culvert exhaust entrance (6), intension exhaust entrance (7), outer culvert exhaust outlet (8), intension exhaust outlet (9), intension outer wall (10).Structure of the present invention is simple, little to engine exhaust performance impact.
Description
Technical field
The present invention relates to a kind of separately gas-discharging type turbofan engine exhausting and denoising system, belong to aeroengine exhaust system design and acoustics noise reduction technology field.
Background technique
When people are day by day urgent to environmental protection requirement, International Civil Aviation Organization and national governments more and more pay attention to the control to civil aircraft noise.Airplane engine noise is one of main component in aircraft noise, and jet noise is the important component in engine noise, especially under takeoff condition.For aeroengine vent systems, the jet noise suppression technology of taking the initiative is a major issue of aeroacoustics and aeroengine research field, meanwhile, to aspects such as improving the riding comfort of civil aircraft, the Sound stealth performance of military aircraft and general industry small nozzle jet noise reduction, all there is important application background.
Specifically, the aerodynamic noise that large bypass ratio separates the civilian motor of gas-discharging type turbofan mainly comes from fan, turbine and jet flow.Wherein, jet noise is that high temperature and high speed exhaust is when mixing with ambient atmosphere, strong turbulence is produced due to high speed difference, part energy is formed with the radiation of acoustic energy form, its sound output is almost directly proportional to 8 powers of jet velocity, the frequency spectrum of noise power and the structure close association of jet flow, have obvious Directivity, and noise intensity is difficult to be decayed with Disposal of Acoustics.
In order to suppress exhaust spraying noise, patent (US4372110, US4720901, US4909346, US5060471, US5722233, US5755092) mention in and utilize lobed mixer to strengthen the mixing of turbofan engine provided with internal duct and external duct air-flow, or injection external environment gas enters engine exhaust jet pipe with being vented and mixes, and reaches reduction exhaust velocity, suppress the object of exhaust sound, these technical measures are applicable to the exhausting and denoising of mixing exhaust formula turbofan engine vent systems.Patent (US5761900) refer to the exhausting and denoising technology of the two poles of the earth injection mixed construction, but is the increase in the length of engine exhaust jet pipe, and is not suitable for separately gas-discharging type turbofan engine.Patent (US6360528B1, US6487848B2) propose to increase sawtooth coronal structure at engine exhaust jet pipe end, with the mixing of reinforcing stimulus jet flow and external environment air-flow, to reach decay exhaust velocity, reduce the object of exhaust sound, relative to lobed mixer, the whirlpool intensity that flows to of saw tooth structure generation wants much weak, and the effect thus strengthening mixing is poor.Patent (US6571549B1) contemplates the pulsing jet generator being positioned at nozzle exit external circumferential and arranging, by the pulsing jet produced, excitation is produced to engine exhaust jet, decay engine exhaust speed, reach noise reduction object, but this covering device adds the complexity of motor.
The present invention proposes the turbofan engine exhausting and denoising structure that a kind of structure is simple, little to the negative effect of engine exhaust performance.
Summary of the invention
The object of the present invention is to provide the separately gas-discharging type turbofan engine exhausting and denoising system that a kind of structure is simple, little to engine exhaust performance impact.
Exhausting and denoising system comprises outer culvert exhaust passage, intension exhaust passage, exhaust rectification inner cone from outside to inside successively; Its China and foreign countries contain exhaust passage and are made up of outer culvert outer wall and outer culvert internal face, and intension exhaust passage is made up of intension outer wall and exhaust rectification inner cone; It is characterized in that: in above-mentioned outer culvert exhaust passage, outer culvert cyclone separator is installed; Diametrically, outer culvert cyclone separator is installed between outer culvert outer wall and outer culvert internal face; In circumference, outer culvert cyclone separator is evenly arranged, the swirl vane of cyclone separator more than four; Axially, outer culvert cyclone separator is positioned at outer culvert exhaust passage end, and outer culvert cyclone separator and engine center axis have certain setting angle, and this angle is between 10-30 degree; In above-mentioned intension exhaust passage, intension cyclone separator is installed; Diametrically, intension cyclone separator is installed between exhaust rectification inner cone and intension outer wall; In circumference, intension cyclone separator is evenly arranged, the swirl vane of cyclone separator more than four; Axially, intension cyclone separator is positioned at intension exhaust passage end, and intension cyclone separator and engine center axis have certain setting angle, and this angle is between 10-30 degree; Above-mentioned outer culvert cyclone separator, intension cyclone separator are contrary with the setting angle of engine center axis, and namely rotation direction is contrary.
As can be seen from this patent, the rotation direction of outer culvert cyclone separator and intension cyclone separator is contrary.Therefore, relative to the inside and outside culvert exhaust do not rotated, the outer intension being vented and turning clockwise of containing be rotated counterclockwise is vented the mixing enhanced under turning effort between inside and outside culvert exhaust, thus reduces the speed of exhaust, reaches the object reducing exhaust sound.
This invention has the following advantages: inside and outside culvert hydrocyclone structure is simple, manufacture and installation cost low.Inside and outside culvert cyclone separator can not change the original structure of separately gas-discharging type turbofan vent systems.The number of cyclone separator and deflection angle can make a choice according to compromise between exhausting and denoising level and exhaust loss.Cyclone separator noise reduction measure is relative to the exhaust noise reducing efforts of other structures, and the loss brought to engine exhaust is little, excellent noise reduction effect.
Cyclone separator is the vitals in the present invention, and the setting angle of cyclone separator all has an impact to engine exhaust performance and exhaust sound inhibition.General, setting angle is larger, and exhaust aerodynamic loss is larger, and noise reduction is better.In addition, setting angle also should be adjusted accordingly along with the size of separating gas-discharging type turbofan engine vent systems.Concrete angle value according to engine total to pneumatic and Noise Design requirement, will obtain a result optimized and compromise, substantially within the scope of 10-30 degree by numerical simulation and test.
Same, the swirl vane number of cyclone separator is also an amount needing make concrete analyses of concrete problems.General, number is more, and exhaust aerodynamic loss is larger, and noise reduction is better, general recommendations more than four.
Accompanying drawing explanation
Accompanying drawing 1 turbofan engine exhausting and denoising system schematic (visual angle);
Accompanying drawing 2 turbofan engine exhausting and denoising system schematic (side view);
Accompanying drawing 3 turbofan engine exhausting and denoising system schematic (bidimensional symmetrical section);
Accompanying drawing 4 is vented inner cone and adds intension cyclone separator sketch (visual angle);
Accompanying drawing 5 is vented inner cone and adds intension cyclone separator sketch (side view);
Accompanying drawing 6 is vented inner cone and adds intension cyclone separator sketch (rear view);
The outer internal face of containing of accompanying drawing 7 adds outer culvert cyclone separator sketch (visual angle);
The outer internal face of containing of accompanying drawing 8 adds outer culvert cyclone separator sketch (side view)
The outer internal face of containing of accompanying drawing 9 adds outer culvert cyclone separator sketch (rear view);
Number in the figure title: 1, outer culvert outer wall, 2, outer culvert cyclone separator, 3, outer culvert internal face, 4, intension cyclone separator, 5, rectification inner cone is vented, 6, outer culvert exhaust entrance, 7, intension exhaust entrance, 8, outer culvert exhaust outlet, 9, intension exhaust outlet, 10, intension outer wall.
Embodiment
Fig. 1, Fig. 2 and Fig. 3 are the separately exhaust turbofan engine exhausting and denoising overall structures that the present invention proposes.The wall of intension outer wall 10 and exhaust rectification inner cone 5 constitutes intension exhaust passage, and intension exhaust entrance 7 exports with engine turbine and is connected, and at intension exhaust passage end, namely inside intension exhaust outlet 9, devises intension cyclone separator 4.Fig. 4, Fig. 5 and Fig. 6 show exhaust rectification inner cone 5 and intension cyclone separator 4 structure, and (4 exist certain angle with motor medial axis to be positioned at the intension cyclone separator of intension channel end
θ, intension exhaust under the effect of intension cyclone separator 4, occur relative to motor medial axis clockwise or be rotated counterclockwise (herein clockwise and counterclockwise relevant with observer position.For the accompanying drawing 6 of this patent, from the eyes front of motor rear, the sense of rotation of intension cyclone separator is clockwise.
Outer culvert outer wall 1 and outer culvert internal face 3 constitute outer culvert exhaust passage, and outer culvert exhaust entrance 6 and motor are contained fan outlet outward and be connected; Contain exhaust passage end outside, namely in outer culvert exhaust outlet 8, devise outer culvert cyclone separator 2 structure.Fig. 7, Fig. 8 and Fig. 9 increase again to illustrate outer culvert internal face 3 and outer culvert cyclone separator 2 structure on the basis of Fig. 4, Fig. 5 and Fig. 6.Be positioned at that the outer culvert cyclone separator 2 of outer culvert channel end is same with motor medial axis exists certain angle
θ, contain under exhaust contains the effect of cyclone separator 2 outside outward, occur relative to motor medial axis clockwise or be rotated counterclockwise (herein clockwise and counterclockwise relevant with observer position.For the accompanying drawing 9 of this patent, from the eyes front of motor rear, the sense of rotation of outer culvert cyclone separator is counterclockwise.
As Fig. 1, 2, shown in 3, the concrete mode that this invention reduces exhaust sound is as follows: the outer culvert air that motor contains fan compression outward enters outer culvert exhaust passage by outer culvert exhaust entrance 6, outer culvert exhaust passage is made up of the part of outer culvert outer wall 1 and outer culvert internal face 3, outer culvert air contains accelerated motion extremely outer culvert channel end in passage outside, under containing the guide functions of cyclone separator 2 outside, define the velocity component of circumferential movement, outer culvert exhaust is when leaving outer culvert exhaust outlet 8, define the motion that is rotated counterclockwise from engines tail to observation, there is the outer culvert be rotated counterclockwise and be vented rotation limit, limit to downstream movement,
The intension gas of engine turbine outlet enters intension exhaust passage by intension exhaust entrance 7, intension exhaust passage is made up of the part of intension outer wall 10 and exhaust rectification inner cone 5, intension gas in intension passage accelerated motion to intension channel end, under the guide functions of intension cyclone separator 4, define the velocity component of circumferential movement, intension exhaust is when leaving intension exhaust outlet 9, define the motion that turns clockwise from engines tail to observation, there is the intension exhaust rotation limit, limit that turns clockwise to downstream movement.
When the outer culvert exhaust be rotated counterclockwise moves to downstream with the intension containing exit gases turned clockwise, under the effect of contrary velocity gradient and gas viscosity, first on the inside and outside surface of contact containing exhaust, there is strong shear-mixed, and gradually to inside and outside culvert exhaust diffusion inside.Because inside and outside culvert exhaust is overall all have contrary rotation, this mixing is not only work on inside and outside culvert surface of contact, and can penetrate into inside and outside culvert exhaust core.Therefore, the velocity attenuation of inside and outside culvert gas fast, exhaust sound reduces effective.The strengthening mixing of inside and outside culvert gas occurs in vent systems outside, does not almost affect owing to mixing the exhaust aeroperformance of viscosity loss on motor brought.
According to CFD (computationalfluiddynamics) and CAA(computationaeroacoustic) numerical simulation, when cyclone separator setting angle
θbe 20 °, when swirler blades reaches more than 4, engine exhaust noise reduces more than 2dB, and exhaust loss is below 0.1%.
Claims (1)
1. separate a gas-discharging type turbofan engine exhausting and denoising system,
Exhausting and denoising system comprises outer culvert exhaust passage, intension exhaust passage, exhaust rectification inner cone (5) from outside to inside successively; Its China and foreign countries contain exhaust passage and are made up of outer culvert outer wall (1) and outer culvert internal face (3), and intension exhaust passage is made up of intension outer wall (10) and exhaust rectification inner cone (5);
It is characterized in that:
In above-mentioned outer culvert exhaust passage, outer culvert cyclone separator (2) is installed; Diametrically, outer culvert cyclone separator (2) is installed between outer culvert outer wall (1) and outer culvert internal face (3); In circumference, outer culvert cyclone separator (2) is evenly arranged, the swirl vane of cyclone separator more than four; Axially, outer culvert cyclone separator (2) is positioned at outer culvert exhaust passage end, and contains cyclone separator (2) and engine center axis outward and have certain setting angle, and this angle is between 10-30 degree;
Intension cyclone separator (4) is installed in above-mentioned intension exhaust passage; Diametrically, intension cyclone separator (4) is installed between exhaust rectification inner cone (5) and intension outer wall (10); In circumference, intension cyclone separator (4) is evenly arranged, the swirl vane of cyclone separator more than four; Axially, intension cyclone separator (4) is positioned at intension exhaust passage end, and intension cyclone separator (4) and engine center axis have certain setting angle, and this angle is between 10-30 degree;
Above-mentioned outer culvert cyclone separator (2), intension cyclone separator (4) are contrary with the setting angle of engine center axis, and namely rotation direction is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410546732.0A CN104405530B (en) | 2014-10-16 | 2014-10-16 | Separately gas-discharging type turbofan engine exhausting and denoising system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410546732.0A CN104405530B (en) | 2014-10-16 | 2014-10-16 | Separately gas-discharging type turbofan engine exhausting and denoising system |
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| Publication Number | Publication Date |
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| CN104405530A CN104405530A (en) | 2015-03-11 |
| CN104405530B true CN104405530B (en) | 2016-03-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105157446A (en) * | 2015-09-10 | 2015-12-16 | 陈盛标 | Coaxial double-fan cooling tower |
| US11117007B2 (en) * | 2017-11-10 | 2021-09-14 | Carrier Corporation | Noise reducing fire suppression nozzles |
| CN108019295B (en) * | 2017-12-15 | 2021-03-30 | 中国航发沈阳发动机研究所 | Turbulent flow noise reduction device for aircraft engine |
| CN109372653A (en) * | 2018-12-13 | 2019-02-22 | 中国航发沈阳发动机研究所 | A kind of fanjet noise-reducing exhaust component |
| CN112059506B (en) * | 2020-09-17 | 2022-09-30 | 中国航发贵州黎阳航空动力有限公司 | Symmetry control device for interlayer supporting seat |
| CN115234938B (en) * | 2022-09-21 | 2022-11-25 | 中国空气动力研究与发展中心空天技术研究所 | Bypass induced-draft high-Mach-number turbine engine airflow blender and design method |
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| NL250991A (en) * | 1959-05-01 | |||
| US5722233A (en) * | 1993-06-23 | 1998-03-03 | The Nordam Group, Inc. | Turbofan engine exhaust mixing area modification for improved engine efficiency and noise reduction |
| FR2911922B1 (en) * | 2007-01-26 | 2009-04-24 | Snecma Sa | VARIABLE SECTION FLOW MIXER FOR A DOUBLE FLOW OF A SUPERSONIC AIRCRAFT |
| CN203257699U (en) * | 2013-02-22 | 2013-10-30 | 吴钰 | Double-duct draught fan |
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