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Flame dynamics in response to transverse acoustic excitation

Investigating thermoacoustic instabilities in annular combustors through studies on a single burner test-rig.
 

The focus of this project is to investigate flame dynamics in response
to transverse acoustic excitation. The motivation behind this
investigation is the need to understand the occurrence of combustion
instability in annular combustors.

Annular combustors are primarily
applied in the gas-turbine industry and their development is hampered by
detrimental pressure oscillations caused due to the development of
combustion instability. Unlike axial combustors, where longitudinal
acoustic modes interact with the flame leading to self-excited
oscillations, combustion instability in annular combustors is dominated
by azimuthal acoustic modes interacting with heat release rate from
circumferentially installed burners.

An experimental investigation of combustion instabilities in annular
combustors is complicated due to the annular geometry employing multiple
burners. However, it is possible to simulate flame-acoustic interaction
during combustion instability in annular combustors on a single burner
test-rig. In this project, experimental investigations will be performed
on a single burner test-rig to understand the interaction of flames to
acoustic forcing introduced in the transverse direction. Such an
investigation will shed light on the mechanism of combustion instability
in annular combustors and the results can be used to develop active and
passive control strategies to suppress combustion instabilities in
annular gas-turbine combustors.

Contact:

Aditya Saurabh

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