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Development of optical measurement techniques for thermo-acoustic diagnostics: fibre-optic microphone, Rayleigh-scattering, and acoustic PIV

Konle, Holger and Rausch, Anne and Fischer, Andre and Doll, Ulrich and Willert, Christian and Paschereit, Oliver and Roehle, Ingo (2009) Development of optical measurement techniques for thermo-acoustic diagnostics: fibre-optic microphone, Rayleigh-scattering, and acoustic PIV. International Journal of Spray and Combustion Dynamics, 1 (2), pp. 251-282. Multi-Science Publishing. ISSN 1756-8277.

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Abstract

Thermo-acoustic investigations require reliable measurement techniques in hot environments for pressure, density fluctuations with a high dynamic range and acoustic particle velocity. This paper presents recent developments of optical measurement techniques in combustion diagnostics. A fibre-optic microphone based on the interferometric detection of membrane deflections was designed to measure acoustic pressure oscillations. Due to the heat resistant design, the sensor has an upper temperature limitation of approximately 970 K. Rayleigh-Scattering measurements, using the density dependent intensity of scattered light were performed in an unconfined flame with approximately 1600 K to study amplitude and phase distribution of the flame pulsation. Acoustic particle velocity can be determined applying acoustic PIV (particle image velocimetry) technique. This paper shows a way to measure simultaneously the acoustic particle velocity and the locally resolved mean flow velocity of a turbulent flow. Together these non-invasive techniques are applicable to study thermo-acoustic processes and sound generation in combustion chambers or turbines.

Document Type:Article
Title:Development of optical measurement techniques for thermo-acoustic diagnostics: fibre-optic microphone, Rayleigh-scattering, and acoustic PIV
Authors:
AuthorsInstitution or Email of Authors
Konle, Holgerholger.konle@pi.tu-berlin.de
Rausch, Anneanne.rausch@dlr.de
Fischer, Andreandre.fischer@dlr.de
Doll, Ulrichulrich.doll@dlr.de
Willert, Christianchris.willert@dlr.de
Paschereit, Oliveroliver.paschereit@tu-berlin.de
Roehle, Ingoingo.roehle@dlr.de
Date:2009
Journal or Publication Title:International Journal of Spray and Combustion Dynamics
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:1
Page Range:pp. 251-282
Publisher:Multi-Science Publishing
ISSN:1756-8277
Status:Published
Keywords:fibre optical microphone, FOM, Rayleigh scattering, time resolved density measurements, acoustic PIV, acoustic particle velocity, acoustic in hot environments
HGF - Research field:Energy, Aeronautics, Space and Transport
HGF - Program:Efficient Energy Conversion (old), Aeronautics
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old), Propulsion Systems
DLR - Research area:Energy, Aeronautics
DLR - Program:E VG - Combustion and Gas Turbine Technologies, L ER - Engine Research
DLR - Research theme (Project):E - Gasturbine (old), L - Virtual Engine and Validation Methods
Location: Köln-Porz , Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Institute of Propulsion Technology > Engine Acoustic
Institute of Propulsion Technology
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:19 Aug 2009 09:54
Last Modified:26 Feb 2013 15:04

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