Verfügbarkeit: Sound emission of low-pressure axial fans under distorted inflow conditions

Sound emission of low-pressure axial fans under distorted inflow conditions:

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Bibliographische Detailangaben
Beteilige Person:	Krömer, Florian J. (VerfasserIn)
Format:	Hochschulschrift/Dissertation Buch
Sprache:	Englisch
Veröffentlicht:	Erlangen FAU University Press 2018
Schriftenreihe:	FAU Forschungen. Reihe B, Medizin, Naturwissenschaft, Technik Band 20
Schlagwörter:	Axialventilator Schaufelform Geräuschminderung Gestaltoptimierung Niederdruck Schallabstrahlung Strömungsakustik Vorderkante Plattenströmung Aerodynamik Akustik Laser-Doppler-Anemometrie Strömungsmaschine Technische Akustik Hochschulschrift
Links:	http://d-nb.info/1155361822/34 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-96018 https://doi.org/10.25593/978-3-96147-089-1 https://open.fau.de/handle/openfau/9601 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=030317489&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
Umfang:	XVIII, 253 Seiten Illustrationen, Diagramme
Format:	Langzeitarchivierung gewährleistet, LZA
ISBN:	9783961470884 396147088X
DOI:	10.25593/978-3-96147-089-1

Internformat

MARC


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Datensatz im Suchindex

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adam_text	CONTENTS NOMENCLATURE V ABSTRACT XV KURZFASSUNG XVII 1 INTRODUCTION 1 1.1 STATE OF THE A R T ............................................................................................. 2 1.1.1 SOUND EMISSION OF AXIAL FANS UNDER INFLOW D IS TO RTIO N S ................ 2 1.1.2 IMPACT OF FAN BLADE SKEW ON THE SOUND EM ISSION.......................... 4 1.1.3 SOUND REDUCTION BY LEADING EDGE M O D IFICATIO N S.......................... 6 1.2 MOTIVATION FOR THE TH E S IS ............................................................................. 9 1.3 STRUCTURE OF THE THESIS ................................................................................ 10 2 FUNDAMENTALS OF FLUID MECHANICS 11 2.1 BASIC EQUATIONS OF FLUID M ECHANICS............................................................. 11 2.2 BASIC EQUATIONS OF AEROACOUSTICS ................................................................ 20 3 FUNDAMENTALS OF TURBOMACHINERY 27 3.1 BASIC EQUATIONS OF TURBOMACHINERY............................................................. 28 3.2 FAN BLADE S K E W ............................................................................................. 38 3.3 FAN ACOUSTICS................................................................................................ 41 3.3.1 SOUND GENERATION MECHANISMS FOR A IR F O ILS ................................... 41 3.3.2 SOUND GENERATION MECHANISMS FOR LOW-PRESSURE AXIAL FANS .... 44 4 AXIAL FAN DESIGN 49 4.1 DESIGN M ETHODOLOGY ................................................................................... 49 4.2 INVESTIGATED LOW-PRESSURE AXIAL FA N S............................................................. 60 5 EXPERIMENTAL SETUP AND MEASUREMENT METHODS 71 5.1 AXIAL FAN TEST C H A M B E R................................................................................ 71 5.2 GENERATION OF INFLOW DISTO RTIO N S ................................................................ 74 5.3 SOUND FIELD CHARACTERISATION....................................................................... 77 5.4 SOUND SOURCE LOCALISATION ............................................................................. 79 5.4.1 BEAMFORMING.................................................................................... 79 5.4.2 MICROPHONE ARRAY S E T U P ................................................................. 88 5.5 FLOW FIELD CHARACTERISATION.......................................................................... 92 5.5.1 VELOCITY M EASUREM ENTS.................................................................... 92 5.5.2 WALL PRESSURE FLUCTUATIONS ............................................................. 100 6 INFLOW PROPERTIES 103 6.1 FREE INFLOW C O N D ITIO N S ................................................................................. 103 6.2 DISTORTED INFLOW C O N D ITIO N S ....................................................................... 105 7 CHARACTERISTIC CURVES 111 7.1 CHARACTERISTIC CURVES UNDER FREE INFLOW CO N D ITIO N S ................................... ILL 7.2 CHARACTERISTIC CURVES UNDER DISTORTED INFLOW C O N D ITIO N S .......................... 114 8 SOUND EMISSION UNDER FREE INFLOW CONDITIONS 119 8.1 SOUND FIE LD .................................................................................................... 119 8.1.1 AVERAGED SOUND PRESSURE S P E C TRA .................................................... 119 8.1.2 SOUND M A P S .................................................................................... 122 8.1.3 INTEGRATED SOUND PRESSURE SPECTRA ................................................ 126 8.2 INTERRELATIONS BETWEEN THE SOUND FIELD AND THE FLOW FIE LD .......................... 127 8.2.1 WALL PRESSURE FLUCTUATIONS ............................................................. 127 8.2.2 VELOCITY DISTRIBUTION ON THE SUCTION SIDE AND PRESSURE SIDE .... 129 9 SOUND EMISSION UNDER DISTORTED INFLOW CONDITIONS 137 9.1 SOUND FIE LD .................................................................................................... 137 9.1.1 AVERAGED SOUND PRESSURE S P E C TRA .................................................... 138 9.1.2 SOUND M A P S .................................................................................... 146 9.1.3 INTEGRATED SOUND PRESSURE SPECTRA ................................................ 150 9.2 INTERRELATIONS BETWEEN THE SOUND FIELD AND WALL PRESSURE FLUCTUATIONS . . 151 10 SOUND REDUCTION BY LEADING EDGE MODIFICATIONS 153 10.1 SIMPLIFIED FAN AND LEADING EDGE M ODIFICATIONS.......................................... 154 10.2 IMPACT OF LEADING EDGE SERRATIONS ON THE CHARACTERISTIC CURVES ................ 156 10.3 IMPACT OF LEADING EDGE SERRATIONS ON THE ACOUSTIC P RO P E RTIE S ................... 160 11 SUMMARY AND OUTLOOK 165 171 BIBLIOGRAPHY APPENDICES 189 A FAN BLADE SKEW ANGLE CONVERSION 191 B FAN DESIGN PARAMETERS 193 C SUPPLEMENTARY PLOTS: CHARACTERISTIC CURVES 205 C.L CHARACTERISTIC CURVES UNDER FREE INFLOW C O N D ITIO N S ................................... 205 C. 2 CHARACTERISTIC CURVES UNDER DISTORTED INFLOW C O N D ITIO N S ...................... 207 C.2.1 EVALUATION AND CORRECTION OF GRID-INDUCED PRESSURE LOSSES .... 207 C.2.2 CHARACTERISTIC CURVES: GRIDS TGI, TG2 AND V G 1 ........................... 209 C. 2.3 CHARACTERISTIC CURVES: GRIDS TG3 AND V G 2 ................................. 209 D SUPPLEMENTARY PLOTS: FREE INFLOW CONDITIONS 217 D. L SOUND FIE LD ............................................................................................. 217 D. 1.1 AVERAGED SOUND PRESSURE S P E C TRA ................................................. 217 D.L.2 SOUND M A P S ..................................................................................... 218 D.L.3 INTEGRATED SOUND PRESSURE SPECTRA .................................................. 218 D. 2 INTERRELATIONS BETWEEN THE SOUND FIELD AND THE FLOW FIE LD ...................... 219 D.2.1 WALL PRESSURE FLUCTUATIONS .............................................................. 219 D. 2.2 VELOCITY DISTRIBUTION ON THE SUCTION SIDE AND PRESSURE SIDE .... 220 E SUPPLEMENTARY PLOTS: DISTORTED INFLOW CONDITIONS WITH GRIDS TG3 AND VG2 229 E. L SOUND FIE LD ............................................................................................. 229 E. 1.1 AVERAGED SOUND PRESSURE S P E C TRA ................................................. 229 E.L.2 SOUND M A P S ..................................................................................... 233 E.L.3 INTEGRATED SOUND PRESSURE SPECTRA .................................................. 241 E. 2 INTERRELATIONS BETWEEN THE SOUND FIELD AND WALL PRESSURE FLUCTUATIONS . . 243 F SUPPLEMENTARY PLOTS: DISTORTED INFLOW CONDITIONS WITH GRIDS TGI, TG2 AND VG1 245 F. L INFLOW CONDITIONS AT THE DESIGN VOLUME FLOW R A TE ................................... 245 F.2 AVERAGED SOUND PRESSURE SP E C TRA ................................................................ 249
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author	Krömer, Florian J.
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genre	(DE-588)4113937-9 Hochschulschrift gnd-content
genre_facet	Hochschulschrift
id	DE-604.BV044924278
illustrated	Illustrated
indexdate	2024-12-20T18:14:23Z
institution	BVB
institution_GND	(DE-588)1068111240
isbn	9783961470884 396147088X
language	English
oai_aleph_id	oai:aleph.bib-bvb.de:BVB01-030317489
oclc_num	1033657299
open_access_boolean	1
owner	DE-29T DE-12 DE-91 DE-BY-TUM DE-29 DE-384 DE-473 DE-BY-UBG DE-703 DE-1051 DE-824 DE-19 DE-BY-UBM DE-1049 DE-92 DE-739 DE-898 DE-BY-UBR DE-355 DE-BY-UBR DE-706 DE-20 DE-1102 DE-860 DE-2174 DE-634
owner_facet	DE-29T DE-12 DE-91 DE-BY-TUM DE-29 DE-384 DE-473 DE-BY-UBG DE-703 DE-1051 DE-824 DE-19 DE-BY-UBM DE-1049 DE-92 DE-739 DE-898 DE-BY-UBR DE-355 DE-BY-UBR DE-706 DE-20 DE-1102 DE-860 DE-2174 DE-634
physical	XVIII, 253 Seiten Illustrationen, Diagramme
psigel	ebook
publishDate	2018
publishDateSearch	2018
publishDateSort	2018
publisher	FAU University Press
record_format	marc
series	FAU Forschungen. Reihe B, Medizin, Naturwissenschaft, Technik
series2	FAU Forschungen. Reihe B, Medizin, Naturwissenschaft, Technik
spellingShingle	Krömer, Florian J. Sound emission of low-pressure axial fans under distorted inflow conditions FAU Forschungen. Reihe B, Medizin, Naturwissenschaft, Technik Axialventilator (DE-588)4205790-5 gnd Schaufelform (DE-588)4225772-4 gnd Geräuschminderung (DE-588)4129292-3 gnd Gestaltoptimierung (DE-588)4329076-0 gnd Niederdruck (DE-588)4337280-6 gnd Schallabstrahlung (DE-588)4052019-5 gnd Strömungsakustik (DE-588)4116645-0 gnd Vorderkante (DE-588)4240199-9 gnd Plattenströmung (DE-588)4320712-1 gnd
subject_GND	(DE-588)4205790-5 (DE-588)4225772-4 (DE-588)4129292-3 (DE-588)4329076-0 (DE-588)4337280-6 (DE-588)4052019-5 (DE-588)4116645-0 (DE-588)4240199-9 (DE-588)4320712-1 (DE-588)4113937-9
title	Sound emission of low-pressure axial fans under distorted inflow conditions
title_alt	Schallabstrahlung von Niederdruck-Axialventilatoren bei gestörten Zuströmbedingungen
title_auth	Sound emission of low-pressure axial fans under distorted inflow conditions
title_exact_search	Sound emission of low-pressure axial fans under distorted inflow conditions
title_full	Sound emission of low-pressure axial fans under distorted inflow conditions Florian J. Krömer
title_fullStr	Sound emission of low-pressure axial fans under distorted inflow conditions Florian J. Krömer
title_full_unstemmed	Sound emission of low-pressure axial fans under distorted inflow conditions Florian J. Krömer
title_short	Sound emission of low-pressure axial fans under distorted inflow conditions
title_sort	sound emission of low pressure axial fans under distorted inflow conditions
topic	Axialventilator (DE-588)4205790-5 gnd Schaufelform (DE-588)4225772-4 gnd Geräuschminderung (DE-588)4129292-3 gnd Gestaltoptimierung (DE-588)4329076-0 gnd Niederdruck (DE-588)4337280-6 gnd Schallabstrahlung (DE-588)4052019-5 gnd Strömungsakustik (DE-588)4116645-0 gnd Vorderkante (DE-588)4240199-9 gnd Plattenströmung (DE-588)4320712-1 gnd
topic_facet	Axialventilator Schaufelform Geräuschminderung Gestaltoptimierung Niederdruck Schallabstrahlung Strömungsakustik Vorderkante Plattenströmung Hochschulschrift
url	http://d-nb.info/1155361822/34 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-96018 https://doi.org/10.25593/978-3-96147-089-1 https://open.fau.de/handle/openfau/9601 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=030317489&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA
volume_link	(DE-604)BV041959107
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