7 papers
Periodic modulation of the space-filling nature of the turbulent flame leads to spiky heat release oscillations
Sivakumar Sudarsanan, Manikandan Raghunathan, Shwetha Viswesh +1
Spiky oscillations are characterized by slow-fast dynamics and are observed in excitable media such as neuronal membranes and cardiac cells. In a turbulent reactive flow system, we…
Metamorphosis of transition to periodic oscillations in a turbulent reactive flow system
Beeraiah Thonti, Sivakumar Sudarsanan, Ramesh S. Bhavi +3
The emergence of periodic oscillations is observed in various complex systems in nature and engineering. Thermoacoustic oscillations in systems comprising turbulent reactive flow e…
Cross-variable amplitude-frequency coupling during intermittency in a turbulent thermoacoustic system
Shruti Tandon, Aswin Balaji, Rohit Radhakrishnan +3
We investigate flame-acoustic interactions in a turbulent combustor during the state of intermittency before the onset of thermoacoustic instability using complex networks. Experim…
Canard explosions in turbulent thermo-fluid systems
Ramesh S. Bhavi, Sivakumar Sudarsanan, Manikandan Raghunathan +2
A sudden transition to a state of high amplitude limit cycle oscillations is catastrophic in a thermo-fluid system. Conventionally, upon varying the control parameter, a sudden tra…
Identifying optimal location for control of thermoacoustic instability through statistical analysis of saddle point trajectories
C. P. Premchand, Abin Krishnan, Manikandan Raghunathan +4
We propose a framework of Lagrangian Coherent Structures (LCS) to enable passive open-loop control of tonal sound generated during thermoacoustic instability. Experiments were perf…
Control of growth of local heat release rate fluctuations to suppress thermoacoustic instability
M. Raghunathan, N. B. George, V. R Unni +3
This experimental study investigates the dynamical transition from stable operation to thermoacoustic instability in a turbulent bluff-body stabilized dump combustor. We conduct ex…
Critical region in the spatiotemporal dynamics of a turbulent thermoacoustic system and smart passive control
Amitesh Roy, C P Premchand, Manikandan Raghunathan +3
We develop a passive control strategy for suppressing thermoacoustic instability in a bluff-body stabilized premixed turbulent combustor. When the equivalence ratio is varied, ther…