Indian Institute of Technology Madras

Potsdam-institut Für Klimafolgenforschung E.v.

Abin Krishnan

Vishnu Rajasekharan Unni

Manikandan Raghunathan

Sujith Raman Indusekharan Pillai Nair

Jürgen Kurths

Amitesh Roy

Krishna Manoj

Norbert Marwan

Reeja Kunnathu Valappil

Midhun Palakkal Raghunath

Sujith Ramanpillai Indusekharan Nair

Samadhan Ananda Pawar

Various kinds of oscillatory instabilities are seen in practical systems. We devise of way of combating these oscillatory instabilities in a thermoacoustic system. Confined combustion environments are prone to large amplitude pressure oscillations known as thermoacoustic instabilities. Although several techniques have been employed to control or mitigate such instabilities, optimization of these methods is achieved at the cost of performing multiple trial and error experiments/simulations. This invention develops a methodology to quantify the spatio-temporal dynamics using synchronization, recurrence, and fractal measures and find the coherent region in such turbulent flow field. Such an analysis provides us with a novel way to detect critical regions responsible for thermoacoustic instability, and other oscillatory instabilities in general, in the flow field and implement an optimized control strategy at these regions.

Systems and methods for suppressing thermo-acoustic instabilities in a combustor

The invention discloses a system for effecting a control strategy in a reactive flow field of a turbulent flow system. The system is configured to analyze flow field properties such as velocity, heat release rate, or mixture fraction of a device during the onset of the oscillatory instability using measures from complex network theory such as betweenness centrality, degree, or closeness. The system identifies critical regions in the flow field responsible for the oscillatory instability. Further, the system also identifies optimal control strategies to avoid the onset of oscillatory instabilities by analyzing the relative strength of various network parameters and thereby controlling oscillatory instabilities which are detrimental to the fluid dynamic system. The disclosed method and system provide for optimization of control of oscillatory instabilities in fluid dynamic systems.

System and method for optimizing passive control of oscillatory instabilities in turbulent flows

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Chennai, India

Abin Krishnan