Dynamics and control of thermoacoustic instability [PDF]
, 2009 © 2009 Dr. William H. MoaseThe use of lean, premixed combustion in gas turbines is now widespread due to their low NOx emissions. Such systems are, however, susceptible to a phenomenon called thermoacoustic instability, which occurs as a result of ...
Moase, William H.
core
Feedback control of oscillations in combustion and cavity flows [PDF]
, 2010 This thesis considers the control of combustion oscillations, motivated by the susceptibility of lean premixed combustion to such oscillations, and the long and expensive development and commissioning times that this is giving rise to.
core +2 more sources
AerospaceThis paper investigates the role of chaotic analysis and deep learning models in combustion instability predictions. To detect the precursors of impending thermoacoustic instability (TAI) in a swirled combustor with various fuel injection strategies, a ...
Boqi Xu +6 more
doaj +1 more source
On the emergence of large clusters of acoustic power sources at the onset of thermoacoustic instability in a turbulent combustor [PDF]
, 2019 In turbulent combustors, the transition from stable combustion (i.e. combustion noise) to thermoacoustic instability occurs via intermittency. During stable combustion, the acoustic power production happens in a spatially incoherent manner.
Marwan, Norbert +3 more
core +1 more source
EnergiesIn combustor systems, thermoacoustic instabilities may occur and must be avoided for reliable operation. An acoustic network model can be used to predict the eigenfrequencies of the instabilities and the growth rate by incorporating the combustion ...
Mehmet Kapucu +2 more
doaj +1 more source
Exploring the effect of ammonia enrichment on longitudinal thermoacoustic instability in an annular combustor [PDF]
This study investigates the characteristics of thermoacoustic instability in an annular combustor fueled with ammonia-methane mixtures, with a particular focus on the impact of ammonia enrichment on longitudinal instability.
Yang, Haojie +3 more
core +1 more source
Universality of oscillatory instabilities in fluid mechanical systems
New Journal of PhysicsOscillatory instability emerges amidst turbulent states in experiments in various turbulent fluid and thermo-fluid systems such as aero-acoustic, thermoacoustic and aeroelastic systems. For the time series of the relevant dynamic variable at the onset of
Vladimir García-Morales +3 more
doaj +1 more source
Bistability and Triggering Analysis of Thermoacoustic Instability in a Horizontal Rijke Tube
Xibei Gongye Daxue Xuebao, 2019 Dynamical systems theory has been often employed to study nonlinear flow and flame dynamics in combustion systems. However, the corresponding studies using nonlinear dynamics to analyze the Rijke tube thermoacoustic system are still occasional.
doaj +1 more source
Evaluation of thermoacoustic instability for chemically reacting flows using large-eddy simulations [PDF]
Thermoacoustic instability for chemically reacting flows was investigated using large eddy simulations coupled with a lookup table for turbulence-chemistry closure.
Lim, Wei Xian +2 more
core +1 more source
Combustion noise is scale-free: transition from scale-free to order at the onset of thermoacoustic instability [PDF]
, 2015 We investigate the scale invariance of combustion noise generated from turbulent reacting flows in a confined environment using complex networks. The time series data of unsteady pressure, which is the indicative of spatiotemporal changes happening in ...
Murugesan, Meenatchidevi, Sujith, R. I.
core +1 more source