Tools for Nonlinear Control Systems Analysis and Design for Aeroengines

Abstract

Abstract : The objective of this research was to develop tools for modeling analysis, and control design for unsteady flow and combustion phenomena critical to operation of military aeroengines. We have made significant progress in control-oriented modeling model validation and control design for processes affecting operation of aeroengines. The progress in modeling includes control-oriented reduced order models for turbomachinery flow including compressors, diffusers, recirculation zones, and jets in cross flow. Major breakthrough was achieved in the area of nonlinear model validation and parameter identification, with particular focus on models of combustion instability. In particular, method of nonlinear model validation and parameter identification for systems with non-equilibrium attractors and noise drive systems based on comparison of long-term statistics has been transitioned to internal UTRC projects. New results in control of limit-cycling systems with bounded control were obtained. Significant progress was achieved in adaptive control of combustion instability, control of pressure recovery in diffusers, control of recirculation zone, and control of jets in cross flow. In particular, framework for control of mixing based on hierarchy of vorticity evolution models has been introduced. The framework has been used in control of mixing enhancement in jets in cross-flow and led to experimental validation of model-based analysis.