CFD-Informed Reduced-Order Modeling of \\Extreme-Speed Turbochargers
POSTER
Abstract
In order to improve their efficiency and performance, aircraft compression-ignition engines often incorporate turbochargers originally designed for ground-based applications. To sufficiently power the aircraft, these turbochargers must operate outside of their standard operating envelopes and consequently encounter high-cycle fatigue brought on by aerodynamically-induced blade resonances. The onset of fluid-structural interactions in turbochargers at these conditions has not been extensively studied. In this talk, we investigate the behavior of the turbine-side of the turbocharger utilizing computational fluid dynamics (CFD) and computational structural dynamics (CSD) methods to understand the mechanisms responsible for turbine blade resonance. A reduced-order model is constructed utilizing the Euler-Lagrange equation. The structural response is described utilizing a method of assumed modes approach, informed by CSD, and the unsteady fluid response is informed by CFD. We specifically investigate the unsteady fluid dynamics model that links blade deformations to the induced surface pressure fluctuations.
*Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-19-2-0077. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. UNCLASSIFIED//APPROVED FOR PUBLIC RELEASE.