Data-Driven Unsteady Aerodynamic Modeling for Transient Blade Response Prediction
ORAL
Abstract
Aircraft intermittent combustion engines often incorporate turbochargers adapted from ground-based applications to improve their efficiency and performance. These turbochargers operate at off-design conditions and experience high-cycle fatigue brought on by aerodynamically-induced blade resonances. A reduced-order model of the aeroelastic response of general fluid-structural configurations is developed using the Euler-Lagrange equation informed by numerical data from uncoupled computational fluid dynamic (CFD) and computational structural dynamic (CSD) calculations. The structural response is derived from a method of assumed-modes approach. The unsteady fluid response is described by a modified version of piston theory augmented with an inhomogeneous source term developed utilizing data-driven methods. The reduced-order model is applied to a classical panel flutter scenario as well as a more complex turbocharger turbine wheel configuration. The capability of the reduced-order model to predict the presence of flutter in both scenarios from a subset of the uncoupled numerical simulation data is presented, including a critical discussion of the accuracy and validity of piston theory in this context.
*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
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Publication:McGowan, R.C., Fellows, D.W., Bodony, D.J., et al. "Effect of Altitude on Turbomachinery Vibration in an Aircraft Compression-Ignition Engine," in Proceedings of ASME Turbo Expo 2020. Fellows, D.W., Bodony, D.J., and McGowan, R.C. "Reduced-Order Modeling of Extreme-Speed Turbochargers," in Proceedings of ASME Turbo Expo 2021. Fellows, D.W., Bodony, D.J., and McGowan R.C. "Reduced-Order Modeling of Aeroelasticity in Extreme-Speed Turbochargers," to be presented at 2021 AIAA Propulsion & Energy Forum.
