Annual Report 2016 - Mechanical Engineering

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214 Thermo-Fluid Dynamics
Thermo-Fluid Dynamics
Modelling and simulation of thermo-fluid dynamic phenomena in energy and process technology
Prof.
Wolfgang Polifke, Ph.D.
n In 2016 important results on intrinsic thermoacoustic feedback and
advective waves in combustion dynamics and combustion noise were
obtained. The formulation of interconnected state space models for
(thermo-)acoustic phenomena made significant progress.
Phone +49.89.289.16216
+49.89.289.16217
Contact
Highlights
n Ralf Blumenthal was awarded the
Dissertation Prize of the Faculty of
Mechanical Engineering for his doctoral
thesis ‘A systems view on non-normal
transient growth in thermoacoustics’
n Extended visit by Prof. José Velasquez
(UTFPR, Brazil) since March
n Wolfgang Polifke served as Chair of the
Colloquium ‘Gas Turbine Combustion’
at the ‘36th Int. Symposium on Com-
bustion’ and was appointed member of
the editorial board of ‘Combustion and
Flame’
Advective Waves
We have revisited the conservation equa-
tions of mass, momentum and energy
across a moving premixed flame front
and could thus resolve some paradoxical
results concerning the coupling conditions
across a flame in the limit of zero Mach
number and the generation of entropy
waves by a flame.
acoustic interactions are of a fundamental
nature, but provide important information
for the proper formulation of analysis and
design tools for thermoacoustic stability.
Key Publications
n Strobio Chen, L., Bomberg, S., Polifke,
W., 2016. Propagation and Generation
of Acoustic and Entropy Waves Across
a Moving Flame Front. Comb. and
Flame 166, 170-180
n Strobio Chen, L., Steinbacher, T., Silva,
C., Polifke, W., 2016. On Generation
of Entropy Waves Across a Premixed
Flame, GT2016-57026, in: Proceedings
of ASME 2016 Turbo Expo, Seoul, Korea
n Albayrak, A., Blumenthal, R.S., Ulhaq,
A., Polifke, W., 2016. An Analytical
Model for the Impulse Response of
Laminar Premixed Flames to Equiv-
alence Ratio Perturbations, in: 36th
Int. Symposium on Combustion.
Combustion Institute. doi:10.1016/j.
proci.2016.06.002
n Albayrak, A., Polifke, W., 2016. Prop-
agation Velocity of Inertial Waves in
Cylindrical Swirling Flow, 23nd Int.
Congress on Sound and Vibration
(ICSV23). IIAV, Athens, Greece.
Projects
n Marie Curie FP7 IPN TANGO, FVV
Stream lines across a premix
flame front. Advective/diffusive
dispersion of entropy waves
develops along the stream lines
(from Strobio et al, ASME, 2016)
An analytical, time-domain model for
the response of premixed flames to fuel
inhomogeneities was formulated, which
provides insight into the important interac-
tions between convective transport of fuel
and the kinematic balance at a propagat-
ing flame. Furthermore, it was shown that
perturbations of swirl in a premix duct are
inertial waves, which propagate at a speed
that is not equal to the mean flow velocity.
These investigations of flow-flame-