Oscillatory instabilities emerge in various flow fields, and are often detrimental in nature. This invention tries to propose a control mechanism, based on identifying the region of critical dynamics with the help of backward time finite-time Lyapunov exponent (FTLE) fields computed based on flow characteristics. Upon identification, these regions are disrupted to prevent the impending instabilities from manifesting.
Figure (1)Image illustrates FTLE field computation with CH* chemiluminescence in a time window in the thermoacoustic instability regime before injecting a secondary air jet in the upstream of the bluff-body, according to an embodiment of the present subject matter.
This invention tries to implement a control mechanism to deal with undesirable oscillatory instabilities in fluid dynamic systems, by developing systems and methods for determining critical regions to control onset of impending oscillatory instabilities and controlling various parameters to prevent the same.
- A computer implemented method of controlling onset of oscillatory instabilities in a turbulent flow system, including the following steps:
- Receiving Data from the Flow Field through Particle Image Velocimetry (PIV) technique or Computational Fluid Dynamics (CFD) methods comprising Direct Numerical Simulations (DNS) and Large Eddy Simulation (LES), and a photomultiplier tube and high speed cameras
- Determination of Flow Characteristics from the data obtained from the measuring devices
- Backward time finite-time Lyapunov exponent (FTLE) fields computed based on flow characteristics are used to calculate critical dynamics
- Identification of one or more regions of critical dynamics associated with impending oscillatory instabilities in the turbulent flow system
- Disruption of the identified region of critical dynamics to control the onset of oscillatory instabilities in the turbulent flow system
The prototype system uses data from measuring devices like Particle Image Velocimetry (PIV), photomultiplier tubes, and high-speed cameras to capture turbulent flow characteristics. A processor computes backward-time finite-time Lyapunov exponent (FTLE) fields from this data to identify critical regions where oscillatory instabilities may arise. The system then applies passive control strategies, such as actuating valves or injecting secondary air jets, to disrupt these critical regions and prevent the onset of instabilities. This integrated approach enables real-time monitoring and optimized suppression of oscillatory instabilities in turbulent flow systems.
Basic formulation has been confirmed and the technology is at the stage of developing realistic representation of end use. (TRL 4)
4
This patent has an indirect but important societal impact by enhancing the safety and reliability of aerospace and defense systems. By preventing harmful oscillatory instabilities in turbines and engines, it helps avoid potential failures, improves system performance, and reduces maintenance costs. While its direct effect on the general public is limited, it contributes to the development of safer and more efficient high-performance technologies.
Oscillatory instabilities can be detrimental to aerospace systems within which they emerge, causing structural failure in vital components. Thus this mitigatory measure is important to install in gas turbines and rocket engines.
Geography of IP
Type of IP
201941022545
455817