What is the actuator need in the turbine

The LSA in its adjoint form can also be used to develop very effective and tailored solutions for flow control. The adjoint LSA makes it possible to localize the starting point of the instability that drives the coherent structures. Furthermore, the areas can be identified that have the highest receptivity to flow modifications through passive or active flow control. This allows the optimal and most effective actuator positions to be derived without the need for time-consuming preliminary tests with an actuator [5].


[1] Oberleithner, K., Sieber, M., Nayeri, C., Paschereit, C., Petz, C., Hege, H.-C., Noack, B., and Wygnanski, I., “Three- dimensional coherent structures in a swirling jet undergoing vortex breakdown: stability analysis and empirical mode construction, ”Journal of Fluid Mechanics, vol. 679, pp. 383-414, 2011.

[2] L. Rukes, C. O. Paschereit, and K. Oberleithner. "An assessment of turbulence models for linear hydrodynamic stability analysis of strongly swirling jets." In: European Journal of Mechanics - B / Fluids 59 (Sept. 2016), pp. 205-218.

[3] P. Paredes, S. Terhaar, K. Oberleithner, V. Theofilis, and C. O. Paschereit. "Global and Local Hydrodynamic Stability Analysis as a Tool for Combustor Dynamics Modeling." In: J. Eng. Gas Turbines Power 138.2 (Sept. 2015), p. 021504.

[4] Kaiser, T.L., Poinsot, T., and Oberleithner, K., “Stability and Sensitivity Analysis of Hydrodynamic Instabilities in Industrial Swirled Injection Systems,” Journal of Engineering for Gas Turbines and Power, vol. 140, no.5, p. 051 506, 2018

[5] Müller, J.S., Lückoff, F. and Oberleithner, K., “Guiding actuator designs for active flow control of the prececessing vortex core by adjoint linear stability analysis,” inASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, American Society of Mechanical Engineers, 2018.