TY - JOUR A1 - Kameier, Frank A1 - Wagner, Thomas A1 - Horvat, Igor A1 - Ullrich, Frank T1 - Experimental and numerical investigation of air dam aeroacoustics JF - ATZ worldwide Y1 - 2009 U6 - https://doi.org/10.1007/bf03225090 VL - 111 IS - 7-8 SP - 54 EP - 59 PB - Springer ER - TY - JOUR A1 - Kameier, Frank A1 - Wagner, Thomas A1 - Horvat, Igor A1 - Ullrich, Frank T1 - Experimentelle und numerische Untersuchung zur Strömungsakustik einer Staulippe JF - ATZ Automobiltech Zeitschrift Y1 - 2009 U6 - https://doi.org/10.1007/bf03222094 VL - 111 IS - 7-8 SP - 562 EP - 567 PB - Springer ER - TY - GEN A1 - de Carvalho, Raphael A1 - Heinze, Robert A1 - Ille, Fabian A1 - Adam, Mario A1 - Kameier, Frank A1 - Schauenberg, Udo T1 - Verbesserte energetische Prognose von air conomy Modulen. Vergleich zwischen Design of Experiments (DoE) und Dimensionsanalyse (Teil 2) T2 - HLH Lüftung/Klima, Heizung/Sanitär, Gebäudetechnik Y1 - 2012 VL - 63 IS - 9 SP - 32 EP - 36 PB - Springer VDI-Verlag ER - TY - JOUR A1 - Biedermann, Till M. A1 - Czeckay, Pasquale A1 - Geyer, Thomas F. A1 - Kameier, Frank A1 - Paschereit, Christian O. T1 - Effect of Inflow Conditions on the Noise Reduction Through Leading Edge Serrations JF - AIAA Journal Y1 - 2019 U6 - https://doi.org/10.2514/1.j057831 SN - 1533-385X VL - 57 IS - 9 SP - 4104 EP - 4109 PB - ARC ER - TY - JOUR A1 - Winkler, Michael A1 - Becker, Klaus A1 - Doolan, Con A1 - Kameier, Frank A1 - Paschereit, Christian Oliver T1 - Aeroacoustic Effects of a Cylinder-Plate Configuration JF - AIAA Journal Y1 - 2012 U6 - https://doi.org/10.2514/1.j051578 VL - 50 IS - 7 SP - 1614 EP - 1620 PB - ARC ER - TY - JOUR A1 - Biedermann, Till M. A1 - Reich, Marius A1 - Kameier, Frank A1 - Adam, Mario T1 - Assessment of statistical sampling methods and approximation models applied to aeroacoustic and vibroacoustic problems JF - Advances in Aircraft and Spacecraft Science KW - artificial neural networks KW - design of experiments KW - Latin hypercube sampling KW - aeroacoustics KW - aerodynamics KW - spectral analysis Y1 - 2019 UR - http://www.techno-press.org/content/?page=article&journal=aas&volume=6&num=6&ordernum=7 U6 - https://doi.org/10.12989/aas.2019.6.6.531 SN - 2287-528X VL - 6 IS - 6 SP - 529 EP - 550 PB - Techno Press ER - TY - JOUR A1 - Biedermann, Till M. A1 - Chong, Tze Pei A1 - Kameier, Frank A1 - Paschereit, Christian O. T1 - Statistical–Empirical Modeling of Airfoil Noise Subjected to Leading-Edge Serrations JF - AIAA Journal Y1 - 2017 U6 - https://doi.org/10.2514/1.j055633 VL - 55 IS - 9 SP - 3128 EP - 3142 PB - ARC ER - TY - CHAP A1 - Biedermann, Till M. A1 - Reich, Marius A1 - Kameier, Frank A1 - Adam, Mario A1 - Paschereit, C. T1 - Assessment of Statistical Sampling Methods and Approximation Models Applied to Aeroacoustic and Vibroacoustic Problem T2 - NOVEM - 6th conference on Noise and Vibration emerging methods, 07.-09.05.2018, Ibiza / Spain Y1 - 2018 CY - Ibiza ER - TY - RPRT A1 - Biedermann, Till M. A1 - Kameier, Frank T1 - Konzeption eines praxisnahen Versuchsstandes zur Untersuchung von Leading Edge Serrations als Proof-of-Concept N2 - Der Einsatz von Leading Edge Serrations (gezackte Tragflächenvorderkanten) als Schallminderungsmaßnahme bei hochturbulenter Anströmung wurde bisher maßgeblich in Form von eben im Windkanal gelagerten, modifizierten Tragflügeln untersucht. Diese Untersuchungen dienten der aeroakustischen Designoptimierung und der Identifikation von Wirkmechanismen anhand eines simplifizierten Systems. Das zukünftige Einsatzgebiet dieser neuartigen Modifikation wird im Bereich von Windenergieanlagen, Flugzeugtriebwerken und kontrarotierenden Rotoren der nächsten Generation aber auch bei gängigen Axialverdichtern gesehen. Der Transfer der im ebenen System erhaltenen Erkenntnisse in Richtung einer rotierenden Applikation erfordert die Berücksichtigung einer Vielzahl an zusätzlichen Einflussgrößen, welche die aerodynamische und aeroakustische Effizienz der Leading Edge Serrations in Form verstärkender oder auch hemmender Effekte signifikant beeinflussen können. Im durchgeführten Projekt wurde untersucht, inwieweit sich diese durch Buckelwale und Eulen inspirierten Tragflächen auf rotierende Systeme übertragen lassen, ohne Einbußen ihrer bereits bestätigten vorteilhaften aeroakustischen und aerodynamischen Eigenschaften zu erleiden. Von besonderem Interesse waren hier etwaige Einflüsse der mit dem Radius variierenden Umfangsgeschwindigkeit sowie der im Praxisfall stark variierenden Anströmrichtungen und –zustände. In diesem Sinne wurde ein experimenteller Versuchsstand in Anlehnung an die DIN EN ISO 5136 zur simultanen Vermessungen der aeroakustischen und aerodynamischen Eigenschaften konzipiert. Ein eigens konzipierter Modellrotor in Form eines Axialverdichters ermöglichte einen flexiblen Austausch der Rotorblätter, was die Möglichkeit einer kosten- und zeitsparenden Variation der Rotorblattgeometrien bietet. Im Rahmen des Projektes konnten neben der Konzeption des Versuchsstandes im Rahmen einer experimentellen Proof-of-Concept Studie und einer umfangreichen Quantifizierung der Zuströmbedingungen auch das Schallreduktionspotential der untersuchten Applikation im rotierenden System nachgewiesen werden. Eine Variation verschiedener aerodynamischer und geometrischer Einflussgrößen lässt zudem allgemeingültige Aussagen bezüglich der zugrundeliegenden Abhängigkeiten zu. Zudem führten parallele Untersuchungen mittels Array-Beamforming mit dem Ziel der Schallquellenlokalisationen zu wertvollen Transfererkenntnissen bezüglich des Einsatzes von Leading Edge Serrations im rotierenden System. Eine erste Untersuchung zur möglichen Approximation der Wirkzusammenhänge von Einfluss- und Zielgrößen wies ein hohes Potential zur komplexen Modellbildung mittels neuronaler Netze aus. Die gewonnenen Erkenntnisse tragen zu einem tieferen Verständnis der zugrundeliegenden Wirkmechanismen von Leading Edge Serrations bei und unterstützten in der Definition weiterer verbleibender Forschungslücken, deren Erforschung im mittel- bis langfristigen Kontext einen Beitrag zu einer industriellen Verwertung dieser Applikation und somit zu einer Reduktion der Lärmbelastung der Bevölkerung leistet. N2 - Leading Edge Serrations are well known for their superior performance in reducing aerofoil-gust-interaction noise as well as beneficial aerodynamic properties such as delayed stall effects and an increased post stall performance. However, up to now, Leading Edge Serrations were mainly analysed in a rigidly mounted setting in front of free jets or in cascade applications in order to investigate fundamental effects and to study the underlying aerodynamic and aeroacoustic principles. Eventually, these serrations are intended to be used in rotating systems such as turbomachines, counter rotating rotors or fans and blowers. Even wind energy turbines represent a possible field of application. The transfer of the rigidly well-analysed serration effects to the rotating frame, though, poses one of the main obstacles for successfully implementing Leading Edge Serrations as a passive noise reduction application as several additional parameters and varying boundary conditions might affect the aerodynamic and aeroacoustic efficiency of the serrations. The current project investigates on how these serrations, inspired by owls and humpback whales, can be transferred to the rotating system by avoiding losses in aeroacoustic and aerodynamic performance and taking into account the already acquired knowledge on the underlying effects. Of particular interest are effects of the circumferential velocity, which scales linearly with the rotor radius as well as effects of varying points of operation, leading to changes in the stagger angles or altering inflow conditions, respectively. For the experimental study a test rig according to the ISO 5136 standard was realised, allowing a simultaneous measurement of both, aerodynamic and aeroacoustic properties. The rotor was self-designed according to the single aerofoil approach, featuring exchangeable fan blades to enable a time- and cost efficient variation of the serration parameters. Apart from realising the test rig and a detailed quantification of the inflow conditions, a Proof-of-Concept study was performed in order to confirm the aeroacoustic effect of Leading Edge Serrations in a rotating application and to carve out the noise reduction potential. Moreover, a variation of the geometric serration parameters as well as the aerodynamic inflow conditions already allows for drawing basic conclusions on the underlying scaling-laws and dependencies. A supplementary aeroacoustic study via array beamforming in the rigid frame provided information on the positions of main noise sources of aerofoils with and without serrations, which were of high value and facilitated a successful transfer to the rotating frame. Finally, by use of artificial neural networks, first steps were undertaken towards modelling the effect of the investigated parameters on the aerodynamic and aeroacoustic performance. A first developed fundamental model already allows for a prediction of the noise radiation and offers multiobjective-optimisation by means of aerodynamic and aeroacoustic properties. T3 - Berichte zu HSD-intern geförderten Forschungsprojekten - 2 KW - Konzeption KW - Leading Edge Serrations KW - Proof of Concept KW - Versuch Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-12300 SN - 2625-3690 CY - Düsseldorf ER - TY - JOUR A1 - Biedermann, Till M. A1 - Hintzen, Nils A1 - Kameier, Frank T1 - Aeroacoustic Interactions of Blade Skew and Leading Edge Serrations Applied to Low-Pressure Axial Fans JF - Journal of Engineering for Gas Turbines and Power N2 - Leading edge serrations are well known for their ability to reduce turbulence-induced noise of single aerofoils while also providing aerodynamic advantages under certain operating conditions. Continuatively, applying leading edge serrations to rotating machinery such as axial fans proved the validity to generally transfer the obtained aeroacoustic benefits of single aerofoils. However, for the rotating applications the noise reduction potential highly depends on the point of operation. The current work aims at assessing the aeroacoustic effects of serrated leading edges under the increased geometrical complexity of the fan blades through blade skew. Therefore, the question is whether combining two potentially effective noise-reducing treatments through blade skew and leading edge serrations results in leveraging or obstructing effects. By varying the skew angle from 0 deg to 38 deg, four different prototypes of the fan impeller are tested experimentally in a test rig according to ISO 5136 and ISO 5801. All configurations are tested with original blades of straight leading edges plus five sets of serrations each, parameterised by the serration amplitude and the serrations wavelength. The intensity of the incoming turbulence ranges from 2.6% to 12.1%. The results obtained show the skewed blades to improve both the aerodynamic performance and the noise radiation after exceeding an initial skew angle, complemented by a significant onset of stall. Moreover, no contraindication between blade skew and serrated leading edges is encountered, showing the potential to further extend the noise reduction capabilities by combining effects of blade skew and leading edge treatment. KW - Lärmschutz KW - Turbulenz KW - Ventilator Y1 - 2022 U6 - https://doi.org/10.1115/1.4055637 SN - 0742-4795 VL - 144 IS - 12 PB - ASME ER - TY - CHAP A1 - Biedermann, Till M. A1 - Moutamassik, Youssef A1 - Kameier, Frank T1 - Assessment of the Impeller/Volute Relationship of Centrifugal Fans From an Aerodynamic and Aeroacoustic Perspective T2 - ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition N2 - Heavy-duty centrifugal fans require high reliability and first-class performance. Besides, extreme conditions and harsh environments are often encountered, such as in the papermaking process, in steel or cement plants or the chemical and petrochemical industry. Therefore, the design of high performance heavy-duty industrial fans requires robust yet efficient solutions. Previous work indicates a high aerodynamic and aeroacoustic sensitivity concerning the specific position of the volute cut-off (tongue). This effect will be further investigated, not by directly changing the orientation of the cutoff, but by varying the position of the impeller relative to a fixed volute casing. The initial evaluation is done through a numerical study of three influencing parameters, which allows the aerodynamic dependencies to be modelled using low-layer artificial networks. Subsequently, extensive experimental studies were carried out to validate the aerodynamic dependencies and also to incorporate information on the aeroacoustic performance. The obtained results show that the operating point represents the key factor in determining the optimal positioning, with qualitatively comparable dependencies found for both tested fans. From an aeroacoustic point of view, the determined optimal configuration does not necessarily coincide with the observed aerodynamic desires, so careful analysis and a reasonable compromise are required, motivating for a multi-objective optimisation process. KW - Ventilator KW - Strömungsakustik KW - Aerodynamik Y1 - 2022 U6 - https://doi.org/10.1115/GT2022-79389 VL - Volume 5: Education; Electric Power; Fans and Blowers PB - American Society of Mechanical Engineers ER - TY - JOUR A1 - Biedermann, Till M. A1 - Czeckay, Pasquale A1 - Hintzen, Nils A1 - Kameier, Frank A1 - Paschereit, C. O. T1 - Applicability of Aeroacoustic Scaling Laws of Leading Edge Serrations for Rotating Applications JF - acoustics KW - DOAJ KW - ISAVE Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-40311 SN - 2624-599X VL - 2 IS - 3 SP - 579 EP - 594 PB - MDPI ER - TY - CHAP A1 - Kameier, Frank A1 - Bienert, Jörg A1 - Pöppel, Josef A1 - Biedermann, Till A1 - Schmonsees, Iris ED - Peissig, Jürgen ED - Rolfes, Raimund T1 - Fallstudien Infraschall und Tinnitus [Vortrag] T2 - DAGA 2024 - 50. Jahrestagung für Akustik, 18.-21. März 2024, Hannover Y1 - 2024 UR - https://pub.dega-akustik.de/DAGA_2024/files/upload/start/DAGA2024_proceedings_manuscripts.pdf SN - 9783939296225 SP - 1144 EP - 1147 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - CHAP A1 - Kameier, Frank T1 - Ist der Blattspitzenlärm von Windturbinen Infraschall? T2 - Tagungsband, DAGA 2023 - 49. Jahrestagung für Akustik 06. - 09. März 2023, Hamburg Y1 - 2023 SN - 9783939296218 SP - 1544 EP - 1547 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - CHAP A1 - Kameier, Frank T1 - Blade tip vortex noise of wind turbines and infrasound [Vortrag] T2 - European Congress on Renewable Energy and Sustainable Development, November 16-17, 2023, , Italy Y1 - 2023 CY - Rome ER - TY - CHAP A1 - Schnieringer, Cédric A1 - Kameier, Frank T1 - Normgerechte Nachbildung analoger Terzfilter mit digitaler Technik – ein Auslaufmodell? [Vortrag] T2 - DAGA 2024 - 50. Jahrestagung für Akustik, 18.-21. März 2024, Hannover Y1 - 2024 UR - https://pub.dega-akustik.de/DAGA_2024/files/upload/start/DAGA2024_proceedings_manuscripts.pdf SN - 9783939296225 SP - 399 EP - 402 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - GEN A1 - de Carvalho, Raphael A1 - Heinze, Robert A1 - Ille, Fabian A1 - Adam, Mario A1 - Kameier, Frank A1 - Schauenberg, Udo T1 - Verbesserte energetische Prognose von air conomy Modulen. Vergleich zwischen Design of Experiments (DoE) und Dimensionsanalyse (Teil 1) T2 - HLH Lüftung/Klima, Heizung/Sanitär, Gebäudetechnik Y1 - 2012 VL - 63 IS - 8 SP - 24 EP - 28 PB - Springer VDI-Verlag ER -