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Main Title: Measurement and modeling of the generation and the transport of entropy waves in a model gas turbine combustor
Author(s): Wassmer, Dominik
Schuermans, Bruno
Paschereit, Christian Oliver
Moeck, Jonas P.
Type: Article
Language Code: en
Abstract: Indirect combustion noise is caused by entropy spots that are accelerated at the first turbine stage. These so-called entropy waves originate from the equivalence ratio fluctuations in the air–fuel mixture upstream of the flame. As entropy waves propagate convectively through the combustion chamber, they are subject to diffusion and dispersion. Because of the inherent difficulty of accurately measuring the burned gas temperature with sufficient temporal resolution, experimental data of entropy waves are scarce. In this work, the transfer function between equivalence ratio fluctuations and entropy fluctuations is modeled by a linearized reactor model, and the transport of entropy waves is investigated based on a convection-diffusion model. Temperature fluctuations are measured by means of a novel measurement technique at different axial positions downstream of the premixed flame, which is forced by periodic fuel injection. Experiments with various flow velocities and excitation frequencies enable model validation over a wide range of parameters.
Issue Date: 2017
Date Available: 19-Dec-2018
DDC Class: 670 Industrielle Fertigung
Subject(s): entropy wave
temperature measurement
equivalence ratio fluctuation
reactor model
transport model
Sponsor/Funder: BMWi, 03ET2012P, Thermoakustisches Stabilitätsverhalten einer mager betriebenen Brennkammer
Journal Title: International Journal of Spray and Combustion Dynamics
Publisher: SAGE Publications
Publisher Place: Washington, DC
Volume: 9
Issue: 4
Publisher DOI: 10.1177/1756827717696326
Page Start: 299
Page End: 309
EISSN: 1756-8285
ISSN: 1756-8277
Appears in Collections:FG Experimentelle Strömungsmechanik » Publications

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