High Frequency Oscillations in a Combustion Chamber

A Novel Mitigation Strategy

Master thesis (2019)

Authors

R.E. de Jongh Mechanical Engineering

Contributors

S.A. Klein Energy Technology - Mechanical, Maritime and Materials Engineering (supervisor 1)
B.J. Boersma Process and Energy (supervisor 2)
Lukasz Panek (coach)
Faculty
Mechanical Engineering
Copyright: © 2019 Reinout de Jongh
Combustion Instabilities High Frequency
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Published Date

15-02-2019

Language

English

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Faculty

Mechanical Engineering

Abstract

Restrictions on NOx emissions are increasingly stricter. In order to reduce the emissions of a gas turbine, manufacturers moved from diffusion-flames to lean premixed flames in their combustion process. However lean premixed flames are prone to (transverse) combustion instabilities. These instabilities consists of thermoacoustically driven pressure oscillations. In order to mitigate acoustic oscillations, dampers are implemented in a gas turbine combustion chamber. These dampers have proven to be effective, but they also consume cooling air, which has a negative impact on the efficiency of the gas turbine. Therefore in this thesis, a solution that potentially provide damping without consuming cooling air is investigated.