EP1571650A1 - Device for producing acoustic fields with a defined modal composition - Google Patents

Device for producing acoustic fields with a defined modal composition Download PDF

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Publication number
EP1571650A1
EP1571650A1 EP04090083A EP04090083A EP1571650A1 EP 1571650 A1 EP1571650 A1 EP 1571650A1 EP 04090083 A EP04090083 A EP 04090083A EP 04090083 A EP04090083 A EP 04090083A EP 1571650 A1 EP1571650 A1 EP 1571650A1
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EP
European Patent Office
Prior art keywords
flow
sound
obstacles
arrangement according
vortex
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Legal status (The legal status 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 status listed.)
Granted
Application number
EP04090083A
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German (de)
French (fr)
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EP1571650B1 (en
Inventor
Marco Dr. Rose
Fredi Dr. Holste
Frank Dr. Arnold
Alastair David Moore
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Rolls Royce Deutschland Ltd and Co KG
Rolls Royce PLC
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Rolls Royce Deutschland Ltd and Co KG
Rolls Royce PLC
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Priority to EP04090083A priority Critical patent/EP1571650B1/en
Priority to DE502004009480T priority patent/DE502004009480D1/en
Priority to US11/068,980 priority patent/US7516815B2/en
Publication of EP1571650A1 publication Critical patent/EP1571650A1/en
Application granted granted Critical
Publication of EP1571650B1 publication Critical patent/EP1571650B1/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure

Definitions

  • the invention relates to an arrangement for the production of Sound fields of certain modal composition as simulated Sound source for acoustic examinations, in particular for simulation of rotor-stator arrangements generated by turbomachinery sound or as a counter-field for active noise reduction.
  • the invention is based on the object, an arrangement to generate sound fields of particular modal content, also referred to below as a mode generator, for use as a simulated sound source for scientific-technical Examinations or as a counter-sound field to indicate active noise reduction, the is simple and low cost can be manufactured and operated.
  • a mode generator for use as a simulated sound source for scientific-technical Examinations or as a counter-sound field to indicate active noise reduction
  • the basic idea of the invention exists in other words in the provision of a mode generator comprising a from a flowable medium, in particular a gas, flowed through flow channel with trained in this Contains flow obstacles.
  • the flow obstacles are shaped so that from this vortex from the flowing Medium are replaced.
  • the shape and size of the flow obstacles and the flow rate in the Flow channel are chosen so that a certain detachment frequency the vortex is not fallen below.
  • the number and spatial arrangement of the flow obstacles adjusted so that one through the entirety of the detached Eddy conditionally, periodically and periodically spatially changing pressure field is generated. This Pressure field excites a sound field of certain modal composition synchronizing this to the vortex shedding reacts.
  • the so formed by feedback Resonant circuit in which the vortex shedding frequency in the range the resonant frequency of the sound field to be excited is, represents a sound wave.
  • the vortex shedding frequency in the range the resonant frequency of the sound field to be excited is, represents a sound wave.
  • the drawing are in a flow channel 1 at whose inner circumference arranged distributed at regular intervals
  • Flow obstacles according to the figures 1 to 3 arranged in the form of only in a cross-sectional plane, perpendicular from the channel inner wall abstrebenden, continuous rectangular bars 10 of equal length with rounded Edges, provided. That is, the flow obstacles 2 can be used to generate different modal Sound fields also have other cross-sectional shapes, further extend into the channel interior or closer the channel wall or, as in Figures 4 to 8 represented, be arranged on supports in the channel or as well as in the channel wall molded recesses (not represented). In particular, the cross-sectional shape the flow obstacles 2 for training of the sound field in the flow channel 1 of importance.
  • the flow obstacles 2 in one and the same flow channel 1 also different be educated.
  • the arrangement and number the flow obstacles 2 variable. That is, the Flow obstacles can be single or in a larger one Number also in two or more cross-sectional planes the flow channel 1, and also offset from one another be arranged (each not shown).
  • the flow channel 1 is in the direction of arrow 3 of a flowable medium, here a gas flows through.
  • a gas flows through.
  • Fig. 9 The mechanism of action of the sound field generator described above (aero-acoustic mode generator) for conversion the flow energy of the medium in acoustic Energy of a flow in the direction of and against Flow direction of propagating sound field is based of Fig. 9 described as follows: Due to the flow solve the flow obstacle 2 periodically vortex 5 and 6, which are downstream of the flow obstruction 2 form a vortex street 7. The removal frequency the vortex 5, 6 depends on the flow velocity and the shape and size of the respective flow obstacle 2 off. As a result of the periodic vortex shedding generated alternating pressures produce sounds that at and above a certain frequency (cut-on frequency, Resonant frequency) in the flow channel 1 propagate can.
  • This frequency depends on the channel geometry (Cross-sectional shape, dimensions), of the flow velocity and the gas temperature.
  • the by the periodic Vortex shedding generated sounds form in the Flow channel 1 an acoustic pressure field 8, that is, a modal sound field or at least one acoustic sound field Mode with in the circumferential direction and / or radial direction, variable amplitude, synchronous to the flow obstacle 2 and the periodic detachment from this the vortex reacts (feedback loop according to arrow 9).
  • the acoustic mode shapes the frequency of vortex shedding and phase on and through the synchronous feedback of the Modes on vortex formation form a high sound pressure level out, who is capable of certain noise levels in technical installations, for example in one Rotor-stator arrangement, to simulate or even - out of phase - for the active noise reduction of an existing one Sound pressure level can be used.
  • the for the sound energy required becomes the energy deprived of the flowing medium, however, is the energy deprivation negligible small and without influence on the effect of the technical device to be examined, e.g. a rotor-stator assembly of a turbomachine.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The simulation of generated noise in a turbo machine has flow [3] passing an obstruction [2] in a duct that causes flow vortices to be shed [5]. The vortices have a frequency that depends upon the flow velocity and geometry of the obstruction. By varying condition a modal model [8] of the sound field is produced. This is used in a noise cancellation process.

Description

Die Erfindung betrifft eine Anordnung zur Erzeugung von Schallfeldern bestimmter modaler Zusammensetzung als simulierte Schallquelle für akustische Untersuchungen, insbesondere zur Simulation des von Rotor-Stator-Anordnungen von Turbomaschinen erzeugten Schalls oder als Gegenschallfeld zur aktiven Schallminderung.The invention relates to an arrangement for the production of Sound fields of certain modal composition as simulated Sound source for acoustic examinations, in particular for simulation of rotor-stator arrangements generated by turbomachinery sound or as a counter-field for active noise reduction.

In vielen technischen Bereichen ist die Anwendung und der Betrieb bestimmter Vorrichtungen, wie beispielsweise Flugzeugantriebe, Fahrzeugantriebe, Verdichter, Gasturbinen, Lüftungsanlagen, Ventilatoren und dgl., mit einem unerwünschten, aero-akustisch bedingten Geräuschpegel verbunden. In solchen Anlagen, beispielsweise bei den Rotor-Stator-Systemen von Verdichtern und Gasturbinen, ist die Untersuchung der Ursachen für die Entstehung und Ausbreitung des Luftschalls oder von zur Geräuschdämpfung getroffenen Maßnahmen mit einer realitätsnahen Versuchsanlage mit einem erheblichen technischen Aufwand verbunden. Bei Turbomaschinen sind derartige Untersuchungen mit Rotor-Stator -Anordnungen möglich, die wegen der erforderlichen Antriebseinheiten, der beweglichen Teile, des hohen Gewichts und der notwendigen Steuermechanismen aufwendig und teuer sind. Außerdem ist auch die Erzeugung eines simulierten Schallfeldes zu Testzwecken oder als Gegenschallfeld zur aktiven Schallminderung, wie beispielsweise in der US 5 702 230 oder der US 5 590 849 beschrieben, mit einem beträchtlichen apparativen, steuerungstechnischen und energetischen Aufwand für die Anordnung und den Betrieb von aktiven Elementen, wie beispielsweise Lautsprecher oder piezo-elektrische Geräuschquellen, verbunden. Zusätzliche Schwierigkeiten bereiten insbesondere die Bereitstellung leistungsfähiger Aktuatoren, deren hohes Gewicht, deren Energiebedarf und deren Betrieb bei hohen Temperaturen, Drücken und Strömungsgeschwindigkeiten.In many technical areas the application and the Operation of certain devices, such as Aircraft drives, vehicle drives, compressors, gas turbines, Ventilation systems, fans and the like, with a unwanted, aero-acoustic noise level connected. In such systems, for example in the rotor-stator systems of compressors and gas turbines, is the study of the causes of the formation and spread of airborne sound or of noise attenuation Measures taken with a realistic test facility associated with a considerable technical effort. In turbomachinery such investigations are with Rotor-stator arrangements possible because of the required Drive units, moving parts, the high weight and the necessary control mechanisms consuming and are expensive. Besides that is also the generation a simulated sound field for test purposes or as Counter-sound field for active noise reduction, such as in US 5,702,230 or US 5,590,849, with a considerable apparatus, control technology and energetic effort for the arrangement and the operation of active elements, such as Loudspeakers or piezoelectric noise sources, connected. To cause additional difficulties in particular the provision of powerful actuators, their high weight, their energy needs and their Operation at high temperatures, pressures and flow velocities.

Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung zur Erzeugung von Schallfeldern bestimmten modalen Inhalts, im folgenden auch als Modengenerator bezeichnet, zur Anwendung als simulierte Schallquelle für wissenschaftlich-technische Untersuchungen oder als Gegenschallfeld zur aktiven Schallminderung anzugeben, die einfach ausgebildet ist und mit geringem Kostenaufwand hergestellt und betrieben werden kann.The invention is based on the object, an arrangement to generate sound fields of particular modal content, also referred to below as a mode generator, for use as a simulated sound source for scientific-technical Examinations or as a counter-sound field to indicate active noise reduction, the is simple and low cost can be manufactured and operated.

Erfindungsgemäß wird die Aufgabe mit einer gemäß den Merkmalen des Patentanspruchs 1 ausgebildeten Vorrichtung gelöst. Weitere Merkmale und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.According to the invention, the object with a according to the Features of claim 1 trained device solved. Further features and advantageous developments The invention will become apparent from the dependent claims.

Der Grundgedanke der Erfindung besteht mit anderen Worten in der Bereitstellung eines Modengenerators, der einen von einem fließfähigen Medium, insbesondere einem Gas, durchströmten Strömungskanal mit in diesem ausgebildeten Strömungshindernissen umfasst. Die Strömungshindernisse sind so geformt, dass von diesen Wirbel aus dem strömenden Medium abgelöst werden. Die Form und Größe der Strömungshindernisse und die Strömungsgeschwindigkeit in dem Strömungskanal sind so gewählt, dass eine bestimmte Ablösefrequenz der Wirbel nicht unterschritten wird. Die Anzahl und räumliche Anordnung der Strömungshindernisse ist so eingestellt, dass ein durch die Gesamtheit der abgelösten Wirbel bedingtes, sich periodisch zeitlich und räumlich veränderndes Druckfeld erzeugt wird. Dieses Druckfeld regt ein Schallfeld von bestimmter modaler Zusammensetzung an, das auf die Wirbelablösung synchronisierend zurückwirkt. Der so durch Rückkopplung gebildete Resonanzkreis, bei dem die Wirbelablösefrequenz im Bereich der Resonanzfrequenz des anzuregenden Schallfeldes ist, stellt eine Schallwelle dar. Mit einfachsten Mitteln kann damit eine Schallquelle für bestimmte akustische Untersuchungen, zum Beispiel unter Fortfall der Stator-Rotor-Anordnung bei Triebwerksuntersuchungen, simuliert werden. Gleichermaßen können mit einer derart einfachen und kostengünstigen Anordnung Gegenschallfelder zur aktiven Schallminderung erzeugt werden. Der Apparate-, Gewichts- und Kostenaufwand kann erheblich reduziert werden.The basic idea of the invention exists in other words in the provision of a mode generator comprising a from a flowable medium, in particular a gas, flowed through flow channel with trained in this Contains flow obstacles. The flow obstacles are shaped so that from this vortex from the flowing Medium are replaced. The shape and size of the flow obstacles and the flow rate in the Flow channel are chosen so that a certain detachment frequency the vortex is not fallen below. The number and spatial arrangement of the flow obstacles adjusted so that one through the entirety of the detached Eddy conditionally, periodically and periodically spatially changing pressure field is generated. This Pressure field excites a sound field of certain modal composition synchronizing this to the vortex shedding reacts. The so formed by feedback Resonant circuit, in which the vortex shedding frequency in the range the resonant frequency of the sound field to be excited is, represents a sound wave. By the simplest means can thus be a sound source for certain acoustic examinations, for example, with elimination of the stator-rotor assembly during engine examinations, simulated become. Similarly, with such a simple and cost-effective arrangement of supersonic fields to the active Sound reduction can be generated. The apparatus, weight and cost can be significantly reduced.

Ein Ausführungsbeispiel der Erfindung wird anhand der Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine Seitenansicht einer erfindungsgemäßen Vorrichtung zur Erzeugung modaler Schallfelder (aero-akustischer Modengenerator);
Fig. 2
die Vorrichtung nach Fig. 1 in einem Längsschnitt;
Fig. 3
eine perspektivische Darstellung der Vorrichtung nach Fig. 1;
Fig. 4
eine Seitenansicht einer anderen Ausführungsform einer Vorrichtung zur Erzeugung modaler Schallfelder;
Fig. 5
die Vorrichtung nach Fig. 4 in einem Längsschnitt;
Fig. 6
eine perspektivische Darstellung eines Strömungshindernisses gemäß der Ausführungsform nach Fig. 4;
Fig. 7
eine Schnittansicht der Stützstange des Strömungshindernisses nach Fig. 6;
Fig. 8
eine Schnittansicht des eine Wirbelablösung bewirkenden Strömungshindernisses nach Fig. 6; und
Fig. 9
eine Darstellung des Wirkprinzips der Vorrichtung zur Erzeugung modaler Schallfelder.
An embodiment of the invention will be explained in more detail with reference to the drawing. Show it:
Fig. 1
a side view of a device according to the invention for generating modal sound fields (aero-acoustic mode generator);
Fig. 2
the device of Figure 1 in a longitudinal section.
Fig. 3
a perspective view of the device of FIG. 1;
Fig. 4
a side view of another embodiment of a device for generating modal sound fields;
Fig. 5
the device of Figure 4 in a longitudinal section.
Fig. 6
a perspective view of a flow obstacle according to the embodiment of FIG. 4;
Fig. 7
a sectional view of the support rod of the flow obstruction of FIG. 6;
Fig. 8
a sectional view of the vortex shedding causing flow obstruction of FIG. 6; and
Fig. 9
a representation of the active principle of the device for generating modal sound fields.

Gemäß der Zeichnung sind in einem Strömungskanal 1 an dessen Innenumfang in regelmäßigem Abstand verteilt angeordnete Strömungshindernisse, gemäß den Figuren 1 bis 3 in Form von nur in einer Querschnittsebene angeordneten, senkrecht von der Kanalinnenwand abstrebenden, durchgehend rechteckigen Stegen 10 von gleicher Länge mit abgerundeten Kanten, vorgesehen. Das heißt, die Strömungshindernisse 2 können zur Erzeugung unterschiedlicher modaler Schallfelder auch andere Querschnittsformen aufweisen, weiter in den Kanalinnenraum hineinreichen oder näher an der Kanalwand liegen oder, wie in den Figuren 4 bis 8 dargestellt, auf Stützen im Kanal angeordnet sein oder auch als in die Kanalwand eingeformte Vertiefungen (nicht dargestellt) ausgebildet sein. Insbesondere ist die Querschnittsform der Strömungshindernisse 2 für die Ausbildung des Schallfeldes in dem Strömungskanal 1 von Bedeutung. Des Weiteren können die Strömungshindernisse 2 in ein und demselben Strömungskanal 1 auch unterschiedlich ausgebildet sein. Schließlich ist die Anordnung und Anzahl der Strömungshindernisse 2 variabel. Das heißt, die Strömungshindernisse können einzeln oder in einer größeren Anzahl auch in zwei oder mehreren Querschnittsebenen des Strömungskanals 1, und zwar auch versetzt zueinander angeordnet sein (jeweils nicht dargestellt). Der Strömungskanal 1 wird in Richtung des Pfeils 3 von einem fließfähigen Medium, hier einem Gas, durchströmt. In dem vorliegenden Fall der Simulation des Schallfeldes einer Rotor-Stator-Anordnung für eine Gasturbine, Verdichter oder dgl. handelt es sich um ein Heißgas oder ein Kaltgas. Die Ausbreitung des Schalls erfolgt gemäß dem Pfeil 4 in Strömungsrichtung 3 und entgegen der Strömungsrichtung 3. Bei der in den Figuren 4 bis 8 gezeigten Ausführungsvariante sind zur Ausbildung der Strömungshindernisse 2 Stege 11 vorgesehen, bei denen auf einer Stützstange 11a im Abstand von der Kanalinnenwand jeweils zwei Wirbelablöseabschnitte 11b im Abstand voneinander angeformt sind. Das Profil der Stützstange 11a ist, wie Fig. 7 zeigt, so geformt, das von diesem im Wesentlichen keine Wirbel abgelöst werden können.According to the drawing are in a flow channel 1 at whose inner circumference arranged distributed at regular intervals Flow obstacles, according to the figures 1 to 3 arranged in the form of only in a cross-sectional plane, perpendicular from the channel inner wall abstrebenden, continuous rectangular bars 10 of equal length with rounded Edges, provided. That is, the flow obstacles 2 can be used to generate different modal Sound fields also have other cross-sectional shapes, further extend into the channel interior or closer the channel wall or, as in Figures 4 to 8 represented, be arranged on supports in the channel or as well as in the channel wall molded recesses (not represented). In particular, the cross-sectional shape the flow obstacles 2 for training of the sound field in the flow channel 1 of importance. Furthermore, the flow obstacles 2 in one and the same flow channel 1 also different be educated. Finally, the arrangement and number the flow obstacles 2 variable. That is, the Flow obstacles can be single or in a larger one Number also in two or more cross-sectional planes the flow channel 1, and also offset from one another be arranged (each not shown). The flow channel 1 is in the direction of arrow 3 of a flowable medium, here a gas flows through. By doing Present case of the simulation of the sound field of a Rotor-stator arrangement for a gas turbine, compressor or the like. It is a hot gas or a cold gas. The propagation of the sound is carried out according to the Arrow 4 in the flow direction 3 and against the flow direction 3. In the shown in Figures 4 to 8 Variant are for the formation of flow obstacles 2 webs 11 provided, where on a Support rod 11a at a distance from the channel inner wall respectively two Wirbelablöseabschnitte 11b at a distance from each other are formed. The profile of the support rod 11a is how Fig. 7, when so formed, shows substantially the same no vertebrae can be detached.

Der Wirkungsmechanismus des oben beschriebenen Schallfeldgenerators (aero-akustischer Modengenerator) zur Umwandlung der Strömungsenergie des Mediums in akustische Energie eines sich in Strömungsrichtung und entgegen der Strömungsrichtung fortpflanzenden Schallfeldes wird anhand der Fig. 9 wie folgt beschrieben: Aufgrund der Strömung lösen sich am Strömungshindernis 2 periodisch Wirbel 5 und 6 ab, die in Strömungsrichtung hinter dem Strömungshindernis 2 eine Wirbelstraße 7 bilden. Die Ablösefrequenz der Wirbel 5, 6 hängt von der Strömungsgeschwindigkeit und der Form und Größe des jeweiligen Strömungshindernisses 2 ab. Infolge der durch die periodische Wirbelablösung erzeugten Wechseldrücke entstehen Töne, die sich bei und oberhalb einer bestimmten Frequenz (cut-on-Frequenz, Resonanzfrequenz) im Strömungskanal 1 ausbreiten können. Diese Frequenz hängt von der Kanalgeometrie (Querschnittsform, Abmessungen), von der Strömungsgeschwindigkeit und der Gastemperatur ab. Die durch die periodische Wirbelablösung erzeugten Töne bilden in dem Strömungskanal 1 ein akustisches Druckfeld 8, das heißt, ein modales Schallfeld oder mindestens eine akustische Mode mit in Umfangsrichtung und/oder radialer Richtung, variabler Amplitude, die synchron auf das Strömungshindernis 2 und die von diesem ausgehende periodische Ablösung der Wirbel zurückwirkt (feedback loop gemäß Pfeil 9). Es entsteht ein geschlossener Resonanzkreis zwischen der Wirbelablösung und der akustischen Mode 8 sowie der akustischen Mode 8 und der Wirbelablösung, das heißt, die akustische Mode prägt der Wirbelablösung ihre Frequenz und Phase auf und durch die synchrone Rückkopplung der Moden auf die Wirbelbildung bildet sich ein hoher Schalldruckpegel aus, der in der Lage ist, bestimmte Lärmverhältnisse in technischen Anlagen, zum Beispiel in einer Rotor-Stator-Anordnung, zu simulieren oder auch - phasenverschoben - zur aktiven Schallminderung eines vorhandenen Schalldruckpegels benutzt werden kann. Die für die Schallerzeugung erforderliche Energie wird der Energie des strömenden Mediums entzogen, jedoch ist der Energieentzug vernachlässigbar klein und ohne Einfluss auf die Wirkung der zu untersuchenden technischen Vorrichtung, z.B. einer Rotor-Stator-Anordnung einer Turbomaschine. The mechanism of action of the sound field generator described above (aero-acoustic mode generator) for conversion the flow energy of the medium in acoustic Energy of a flow in the direction of and against Flow direction of propagating sound field is based of Fig. 9 described as follows: Due to the flow solve the flow obstacle 2 periodically vortex 5 and 6, which are downstream of the flow obstruction 2 form a vortex street 7. The removal frequency the vortex 5, 6 depends on the flow velocity and the shape and size of the respective flow obstacle 2 off. As a result of the periodic vortex shedding generated alternating pressures produce sounds that at and above a certain frequency (cut-on frequency, Resonant frequency) in the flow channel 1 propagate can. This frequency depends on the channel geometry (Cross-sectional shape, dimensions), of the flow velocity and the gas temperature. The by the periodic Vortex shedding generated sounds form in the Flow channel 1 an acoustic pressure field 8, that is, a modal sound field or at least one acoustic sound field Mode with in the circumferential direction and / or radial direction, variable amplitude, synchronous to the flow obstacle 2 and the periodic detachment from this the vortex reacts (feedback loop according to arrow 9). It creates a closed resonant circuit between the vortex shedding and the acoustic mode 8 and the acoustic mode 8 and the vortex shedding, that is, the acoustic mode shapes the frequency of vortex shedding and phase on and through the synchronous feedback of the Modes on vortex formation form a high sound pressure level out, who is capable of certain noise levels in technical installations, for example in one Rotor-stator arrangement, to simulate or even - out of phase - for the active noise reduction of an existing one Sound pressure level can be used. The for the sound energy required becomes the energy deprived of the flowing medium, however, is the energy deprivation negligible small and without influence on the effect of the technical device to be examined, e.g. a rotor-stator assembly of a turbomachine.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Strömungskanalflow channel
22
Strömungshindernisflow obstruction
33
Strömungsrichtung, StrömungsenergieflusssFlow direction, flow energy flow
44
Schallausbreitungsrichtung, akustischer EnergieflussSound propagation direction, acoustic energy flow
55
abgelöste Wirbeldetached vertebrae
66
abgelöste Wirbeldetached vertebrae
77
Wirbelstraße, aerodynamische SchallquelleVortex street, aerodynamic sound source
88th
Akust. Mode, modales Schallfeld, DruckfeldAudible. Fashion, modal sound field, pressure field
99
Feedback Loop, Rückkopplung zw. 8 und 2Feedback loop, feedback between 8 and 2
1010
Stege mit gleichbleibendem ProfilWebs with constant profile
1111
Stege mit mehreren AblöseabschnittenBars with several detachment sections
11a11a
StützstangeStabilizer
11b11b
WirbelablöseabschnittVortex shedding section

Claims (8)

Anordnung zur Erzeugung von Schallfeldern bestimmter modaler Zusammensetzung als simulierte Schallquelle für akustische Untersuchungen, insbesondere zur Simulation des von Rotor-Stator-Anordnungen von Turbomaschinen erzeugten Schalls, oder als Gegenschallfeld zur aktiven Schallminderung, gekennzeichnet durch einen von einem fließfähigen Medium durchströmten Strömungskanal (1) mit mindestens einem in diesem vorgesehenen Strömungshindernis (2) zur periodischen Ablösung von Wirbeln (5, 6) mit einer bestimmten Ablösefrequenz in Abhängigkeit von der Form und Größe der Strömungshindernisse (2) und von der Strömungsgeschwindigkeit, wobei die Anzahl und räumliche Anordnung der Strömungshindernisse (2) so gewählt ist, dass ein durch die Gesamtheit der abgelösten Wirbel bedingtes sich periodisch räumlich und zeitlich veränderndes Druckfeld zur Anregung eines Schallfeldes (8) bestimmten modalen Inhalts erzeugt wird, das auf die Wirbelablösung synchronisierend zurückwirkt, und ein so gebildeter Resonanzkreis, bei dem die Wirbelablösefrequenz im Bereich der Resonanzfrequenz des anzuregenden Schallfeldes ist, die Schallquelle darstellt.Arrangement for generating sound fields of particular modal composition as a simulated sound source for acoustic examinations, in particular for simulating the sound generated by rotor-stator arrangements of turbomachines, or as a counter-sound field for active noise reduction, characterized by a flow channel (1) through which a flowable medium flows at least one flow obstruction (2) provided therein for the periodic detachment of vortices (5, 6) at a given frequency of descent in dependence on the shape and size of the flow obstacles (2) and on the flow velocity, the number and spatial arrangement of the flow obstacles (2 ) is selected so that a caused by the totality of the detached vortex periodically spatially and temporally changing pressure field for excitation of a sound field (8) certain modal content is generated, which acts on the vortex shedding synchronizing back, and a resonant circuit formed in this way, in which the vortex shedding frequency is in the range of the resonant frequency of the sound field to be excited, represents the sound source. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass mehrere Strömungshindernisse (2) in einer oder mehreren Querschnittsebene(n) des Strömungskanals (1) sowohl in Umfangsrichtung als auch in Strömungsrichtung in regelmäßigem oder unregelmäßigem Abstand angeordnet sind. Arrangement according to claim 1, characterized in that a plurality of flow obstacles (2) in one or more cross-sectional plane (s) of the flow channel (1) are arranged both in the circumferential direction and in the flow direction at regular or irregular intervals. Anordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Strömungshindernisse (2) von der Innenwand des Strömungskanals abstrebende Stege (10, 11) mit einer Profilierung sind, die eine periodische Ablösung von Wirbeln (5 und 6) zur Ausbildung einer Wirbelstraße (7) und von Tönen sowie der entsprechenden akustischen Moden (8) gewährleistet.Arrangement according to claim 2, characterized in that the flow obstacles (2) of the inner wall of the flow channel struts away webs (10, 11) with a profiling, the periodic detachment of vortices (5 and 6) to form a vortex street (7) and of sounds and the corresponding acoustic modes (8). Anordnung nach Anspruch 3, dadurch gekennzeichnet, dass die Stege (11) aus einer Stützstange (11a) mit einem oder mehreren Wirbelablöseabschnitt(en) (11b), die im Abstand von der Innenwand des Strömungskanals (1) und/oder im Abstand voneinander angeordnet sind, bestehen, wobei die Stützstange so profiliert ist, dass an dieser keine oder eine vernachlässigbare Wirbelablösung erfolgt.Arrangement according to claim 3, characterized in that the webs (11) of a support rod (11a) with one or more Wirbelablöseabschnitt (s) (11b), the spaced from the inner wall of the flow channel (1) and / or spaced from each other are, wherein the support rod is profiled so that there is no or negligible vortex shedding at this. Anordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Strömungshindernisse (2) in die Innenwand des Strömungskanals (1) eingeformte Kavitäten sind.Arrangement according to claim 2, characterized in that the flow obstacles (2) are in the inner wall of the flow channel (1) molded cavities. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass das Strömungsmedium ein kaltes oder ein heißes Gas ist.Arrangement according to claim 1, characterized in that the flow medium is a cold or a hot gas. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass zur Steuerung der Phasenlage der Wirbelablösung an den Strömungshindernissen Mittel zur Schwingungsanregung vorgesehen sind.Arrangement according to claim 1, characterized in that means are provided for the vibration excitation to control the phase position of the vortex shedding at the flow obstacles. Anwendung nach einem der Ansprüche 1 bis 4 und 7, dadurch gekennzeichnet, dass die Strömungshindernisse (2) in mehreren Achsen verstellbar ausgebildet sind.Application according to one of claims 1 to 4 and 7, characterized in that the flow obstacles (2) are adjustable in several axes.
EP04090083A 2004-03-03 2004-03-03 Device for producing acoustic fields with a defined modal composition Expired - Fee Related EP1571650B1 (en)

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US11/068,980 US7516815B2 (en) 2004-03-03 2005-03-02 Arrangement for the generation of sonic fields of a specific modal composition

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