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NOISE GENERATION IN HOT NOZZLE FLOW

Knobloch, Karsten and Werner, Tiago and Bake, Friedrich (2015) NOISE GENERATION IN HOT NOZZLE FLOW. In: Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, 15.-19.06.2015, Montreal, Canada.

Full text not available from this repository.

Abstract

Noise originating from the unsteady heat-release during the combustion process in the combustor of a gas turbine is well known. However, an effect known as indirect combustion noise has received considerable interest only recently. Indirect combustion noise will be generated, when entropy or vorticity fluctuations will be subject to a strong velocity gradient like in nozzle guide vane of the high pressure turbine. First experimental proof of this phenomenon could be obtained some years ago in a dedicated small-scale laboratory experiment. Recent experiments performed in the Hot Acoustic Test rig (HAT) by the German Aerospace Center (DLR) aim at further understanding of this phenomenon by investigating the sound propagation through a nozzle and sound generation when cold air spots are injected into a hot mean flow. The nozzle Mach number was varied from subsonic to sonic conditions. First results based on propagation time analysis reveal noise generation at the location of the nozzle. Parameter studies of nozzle Mach number, temperature of the cold streaks, and the way the cold air is injected (radial/axial blowing) have been performed.

Item URL in elib:https://elib.dlr.de/96948/
Document Type:Conference or Workshop Item (Speech)
Title:NOISE GENERATION IN HOT NOZZLE FLOW
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knobloch, KarstenAT-TRAUNSPECIFIED
Werner, TiagoAT-TRAUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
Date:June 2015
Journal or Publication Title:Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Indirect combustion noise, Entropy noise, Sound propagation through nozzle
Event Title:ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Event Location:Montreal, Canada
Event Type:international Conference
Event Dates:15.-19.06.2015
Organizer:ASME - International Gas Turbine Institute
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combusion Chamber Technologies (old)
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Knobloch, Dr. Karsten
Deposited On:10 Jul 2015 12:29
Last Modified:12 Jan 2016 15:24

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