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WO1983002302A1 - Method and device for reducing the noise of combustion engines - Google Patents

Method and device for reducing the noise of combustion engines

Info

Publication number
WO1983002302A1
WO1983002302A1 PCT/EP1982/000278 EP8200278W WO8302302A1 WO 1983002302 A1 WO1983002302 A1 WO 1983002302A1 EP 8200278 W EP8200278 W EP 8200278W WO 8302302 A1 WO8302302 A1 WO 8302302A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
sound
exhaust
according
valve
gas
Prior art date
Application number
PCT/EP1982/000278
Other languages
German (de)
French (fr)
Inventor
Hartmut Rosenberg
Original Assignee
Hartmut Rosenberg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12Intake silencers Sound modulation, transmission or amplification
    • F02M35/1205Flow throttling or guiding
    • F02M35/1227Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02Energy absorbers; Noise absorbers
    • F16L55/033Noise absorbers
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or damping of, acoustic waves, e.g. sound
    • G10K11/161Methods or devices for protecting against, or damping of, acoustic waves, e.g. sound in systems with fluid flow
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/14Technologies for the improvement of mechanical efficiency of a conventional ICE
    • Y02T10/146Charge mixing enhancing and kinetic or wave energy of charge outside the combustion chamber, i.e. ICE with external or indirect fuel injection

Abstract

Procédé et dispositif de réduction du bruit, notamment à haute fréquence, des moteurs à combustion. Process and the noise reduction device, in particular high-frequency combustion engines. A cet effet, des éléments (18) sont insérés directement après les sièges (12) des soupapes d'échappement. For this purpose, elements (18) are inserted directly after the seats (12) of the exhaust valves. Le bruit d'échappement peut être diminué de 15 dB et le cas échéant on peut renoncer à un pot d'échappement. The exhaust noise can be reduced by 15 dB, and if necessary can be dispensed with a muffler. Application: moteurs à combustion. Application: combustion engines.

Description

METHOD AND DEVICE FOR REDUCING THE NOISE AT BRENN¬ ENGINES

The invention relates to a method for reducing or transforming the sound emi ss ion and also has a device for reducing the sound, ins¬ particular in internal combustion engines to the object.

As particularly disturbing the scarf "Statutory regulations will share perceived at low 'frequencies, which also leads to resonances at the same sound emission intensity. Make for example in internal combustion engines Schall¬ damper formations for resting.

The invention is based on the recognition that the low-frequency internal gas pressure fluctuations (level) pipeline is responsible for the intensity of the Schallweiter¬, for example, in an exhaust system.

The invention has the object of providing a method and apparatus to provide such a way that can be dispensed combustion engine, for example, to the silencer a Verbrennungs¬.

This is achieved according to the invention in a method of the type mentioned surprising in that DER free jet destroyed immediately after exiting within the length of Kerπzone of the free jet, in particular divided auf¬.

Preferably to proceed in such a way that the shear stress is destroyed, especially the wodurc be reduced at a gas expansion for the relevant sound share er¬ irresponsible Quadrupolquellen and belbildung the Wir¬ related.

In other words, it will be ensured that the resulting sound frequencies are 1- shifted to higher frequencies; the more readily dissipate.

A preferred apparatus for reducing the sound s s arising in the expansion zone, in particular in internal combustion engines of exhaust valves, characterized by internals in the core zone of the Strah Strömuπgsfeldes immediately behind the exhaust valve.

By the measure according to the invention it is possible, the sound emission of an exhaust gas or the gas volume flow from a (outlet) valve in general and in particular an internal combustion engine

- in terms of frequency to transform to higher frequencies,

- in intensity L (dB) to ve__minde.ni greatly (up to 20 άBA), - low-frequency resonance vibrations in a connected pipeline system, for example to prevent the exhaust system, and

- contribute to reduce the flow resistance in the outlet duct near the valve and thus in an internal combustion engine to better energy efficiency (fuel economy).

The core zone of a gas jet is so destroyed immediately after the valve outlet or released. Thus a better flow guidance is ensured that large eddy formation is prevented. This tieffre--frequency components v / ground thus higher sound frequencies shifted. The acoustic emission in terms of the sound conduction in the gas is thereby reduced (muzzle noise) that in a medium frequency acoustic shares dissipate faster. the local sound radiation is also reduced by reducing the inner gas pressure fluctuation.

The arranged directly behind the outlet valve internals are formed insbeson particular ungsgleichrichtεr streamlined in subsequent curved lines as Strö.

According to particular embodiments, the internals in the cross-section may be of a honeycomb, tubular, trapezoidal or consist sieve-like grid, orfrom further velocity and pressure equalizing flow rectifiers.

It is advantageous if the length 1 of the baffles is 1 = (1 - 4) d and the pitch t of the honeycomb or tube fittings t = (l / lo - 1/3) -d is, where d is the characteristic diameter of the nozzle is ring nozzle or orifice.

The internals can be inserted to be held by a snap fastening ring at the Auspuffrohr¬ or secured to the valve stem.

In a development, and to support the measure and of decreasing the noise emission of the space in the region of the beam exit and existing here core zone should be extended compared to the exhaust gas discharge line.

The invention will now be closer erläu¬ tert with reference to the accompanying drawings. These show in

1 shows a section through an embodiment according to the invention.

. Fig. 2 is a sectional view of configurations of details of Figure 3 shows a detail of Fig. 2c;

Fig. 4 are considerations regarding free jets;

Fig. 5 considerations of free jets in pipelines again; and Figures 6 and 7 illustrate the effects on An¬ message object (displacement against low-frequency vibrations).

Fig. 1 shows a section through the cylinder head of an internal combustion engine having the exhaust valve 10, the associated Auslaßventilschlitzen 12 (the piston is at 14 indicated), the exhaust pipe 16 and the inventive configuration of the baffles 18. These baffles, in cross-section in FIG. 2 are formed, are eingescho¬ ben and fixed in a manner not shown, for example by flanging to the exhaust pipe 16 or by a circlip, also not shown in the exhaust manifold 20th The installations follow the course of the exhaust manifold.

In the illustration just indicated is the expansion of the exhaust manifold immediately downstream of the outlet valve. ' According to the preferred form Ausführungs¬ not shown a significant extension follows immediately behind the outlet cross-section of the valve.

Fig. 2a shows in cross section a pure grid-shaped formation of such fittings;

FIG. 2b shows another tubular fixed structures; Fig. 2c can honeycomb internals; Fig. 2d recognize trapezoidal fixtures. but the internals may be sieve-like. They all serve to divide already in the core zone of the strong free jet into a plurality of parallel possible rays wesent¬ Lich less turbulent than the original free jet

- are. Thereby, the above-mentioned effects (displacement to höherfrequentiger sound emission and thus reduced transmission of sound) can be achieved. Quadrupolquellen be destroyed, the Auf¬ division into smaller parking table parallel beams of which the local velocity gradient is smaller Lich ^ ^ ^ esen. The internals are only so far limited in Vo¬ volume that do not have high Druckvεrluste are to be accepted.

By dividing the free jet into individual smaller beam units erglichen with the undisturbed Frei¬ beam, thus significantly reduces the fluidized: Larger fluidized bales are dissolved; the sonically resulting frequency spectrum shifts to higher frequencies.Tues. it occurs ge Mäss the formula:

C S t. _ = D f ', respectively. f = St j c

(Strouhal number = diameter by frequency divided by flow rate).

Thus, due to a smaller diameter d Fre¬ higher frequencies at a constant Strouhal number, wherein

St = cons.t. = About 0.2 and at a constant volume flow rate (Strömungs¬ speed). Mathematically and measurement technology, this is proven by studies carried out, as the figures reveal. 6 and 7 The Frequenz¬ shift can be seen in the diagrams 6 and 7. Chart 6 indicates the internal sound power level ^ depending on the standard volume flow V at the measuring spot again. It was from 6 bar to about 40 mbar Ober¬ depressurized.'In Diagram 7 is an A-weighted, sound power level outer wa ^ n, depending on the standard volume gas stream V with a considerable relaxation, wherein the displacement at low frequencies can be seen.

A shift to a higher frequency range is therefore to a reduced sound conduction and - a reduction of the local sound radiation. This can be made clear when considering the general circumstances. The graphs 4 and 5 give studies of ring nozzles and valves again. These charts allow for an assessment of the results for damped and undamped according to the invention conditions.

Fig. 5 shows mean flow velocities and Geschwindigke.itsschwankungen of free jets in Rohr¬ lines and that in the left part of the nozzle, in the right part of ring nozzles.

In contrast, Fig. 4 illustrates the mean Strömungs¬ speeds and variations in speed of undisturbed free jets and a) for nozzle b) for ring nozzles.

When using the kits for Schall¬ reduction was, for example, 20 dB.

By rectifying and fluidized resolution effect of the installation kit locally high pressure and Ge schwindigkeitsfelder a gas jet are (reduced in a closed channel an¬ locally smaller

- JRE - 6 -

Wiτbelgeschwindigkeiten) and thus, the (to a valve nozzle) connected channel flow resistance smaller (reduction in pressure loss). In an engine process so that a smaller back pressure on the exhaust valve can be achieved. The theoretical Motor¬ process (p, v diagram) thus providing a better thermal efficiency and thus would allow a combustion fuel economy.

By the combined action of the expansion chamber in the expansion zone, as well as the internals of the effect of lowering the noise level and the Vermei¬ is dung standing waves in the exhaust pipe or lowered by the measure according to the invention can be completely dispensed with a muffler in the exhaust conduit if necessary.

Claims

- CLAIMS
1. A method for reducing or transforming the Schall¬ emission, characterized in that the free jet, the ent is in a gas expansion through a nozzle orifice or ring die destroyed within the core zone, or a plurality of play in Strahl¬ is decomposed.
2. The method of claim 1, characterized in that the shear stresses destroyed in the jet zone, and thus the sound-insbe¬ sondere Quadrupolquellen be reduced.
3. The method according to any one of the preceding claims, characterized in that the sound frequencies are shifted by internals in the spread zone to higher frequencies.
4. An apparatus for reducing the noise, in particular in internal combustion engines, characterized by Eintauten (18) in the core zone (Fig. 5) of the flow field immediately hin¬ ter the outlet, in particular a ring or circular die or a valve.
5. Device according to claim 4, characterized in that the internals are formed (18), in particular for the exiting annular jet, as a flow rectifier for reducing the friction and flow losses (eddy).
6. Device according to one of claims 4 or 5, characterized in that the baffles (18) in cross-section of a honeycomb, tubes, trapezoidal, sieve-shaped or consist flow and pressure equalizing grid array.
7th 'A device according to any one of claims 4 to 6, characterized in that the length (1) of the internals 1 = (1 - 4) d (d = the characteristic diameter of the nozzle, ring nozzle or orifice) and the pitch (t) of the honeycomb or tube fittings t = (1/10 - 1/3) are approximately d.
8. Device according to one of claims 4 to 7, characterized in that the baffles (18) inserted and easy installation and removal (replaceable) and by a holding device, in particular a snap ring are held, wherein the material is optionally heat-resistant.
9. Device according to one of claims 4 to 7, characterized in that the baffles (18) inserted into the engine block, attached via flange mounting between the engine block and the exhaust pipe (16) or are assembled to the valve stem.
10. Device according to one of claims 4 to 9, characterized in that the space is extended behind the beam exit opening to the exhaust gas outlet pipe.
11. Device according to one of claims 4 to 10, characterized in that the closing Discharge Head an¬ within the gas expansion zone (20) is expanded.
"
PCT/EP1982/000278 1981-12-30 1982-12-30 Method and device for reducing the noise of combustion engines WO1983002302A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEP3151873.7811230 1981-12-30
DE19813151873 DE3151873A1 (en) 1981-12-30 1981-12-30 to reduce or transform method of the sound emission and apparatus for reducing the sound, particularly in internal combustion engines

Publications (1)

Publication Number Publication Date
WO1983002302A1 true true WO1983002302A1 (en) 1983-07-07

Family

ID=6149990

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1982/000278 WO1983002302A1 (en) 1981-12-30 1982-12-30 Method and device for reducing the noise of combustion engines

Country Status (3)

Country Link
EP (1) EP0097683A1 (en)
DE (1) DE3151873A1 (en)
WO (1) WO1983002302A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2472859C1 (en) * 2011-05-18 2013-01-20 Государственное образовательное учреждение высшего профессионального образования Первый Московский государственный медицинский университет им. И.М. Сеченова Министерства здравоохранения и социального развития Российской Федерации (ГОУ ВПО Первый МГМУ им. И.М. Сеченова Минздравсоцразвития России) Method for formation of dna methylation marker systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1078871A (en) * 1953-06-17 1954-11-24 Nat Res Dev Method and means for reducing the noise produced by the gas flow to the orifices traven
US3503465A (en) * 1966-08-05 1970-03-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3579981A (en) * 1970-05-06 1971-05-25 Chrysler Corp Anti-pollution exhaust valve combination with fluidic control and valve cooling features
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
DE2533669A1 (en) * 1974-08-02 1976-02-19 Ford Werke Ag A method and means for controlling the exhaust emissions of an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1078871A (en) * 1953-06-17 1954-11-24 Nat Res Dev Method and means for reducing the noise produced by the gas flow to the orifices traven
US3503465A (en) * 1966-08-05 1970-03-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3579981A (en) * 1970-05-06 1971-05-25 Chrysler Corp Anti-pollution exhaust valve combination with fluidic control and valve cooling features
US3884323A (en) * 1974-07-11 1975-05-20 Du Pont Device for gas-exit ducts to convert vortical gas flow to sound-attenuated axial gas flow
DE2533669A1 (en) * 1974-08-02 1976-02-19 Ford Werke Ag A method and means for controlling the exhaust emissions of an internal combustion engine

Also Published As

Publication number Publication date Type
DE3151873A1 (en) 1983-07-07 application
EP0097683A1 (en) 1984-01-11 application

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