A Numerical Study of a Rotor Induced Flow Based on a Finite-State Dynamic Wake Model

Author(s)

L. G. A. FERREIRA ^[1] ; C. C. PAGANI JÚNIOR ^[2] ; E. M. GENNARO ^[3] ; C. DE MARQUI JUNIOR ^[4]

Affiliation

^[1] São Paulo State University - Brasil

^[2] São Paulo State University - Brasil

^[3] São Paulo State University - Brasil

^[4] University of São Paulo. Department of Aeronautic Engineering - Brasil

• Document type: Journal article
• Source: Trends in Computational and Applied Mathematics; v. 22, n. 2, p. 307-324, 2021-07-02.

Abstract

ABSTRACT A Helicopter rotor undergoes unsteady aerodynamic loads ruled by the aeroelastic coupling between the elastic blades and the dynamic wake induced by rotary wings. Modeling the dynamic interaction between the structural and aerodynamic fields is a key point to understand aeroelastic phenomena associated with rotor stability, flow induced vibration and noise generation, among others. In this study, we address the Generalized Dynamic Wake Model, which describes the inflow velocity field at the rotor disk as a superposition of a finite number of induced flow states. It is a mature model that has been validated based on experimental data and numerically investigated from an eigenvalue problem formulation, whose eigenvalues and eigenvectors provide a deeper insight on the dynamic wake behavior. The paper extends the results presented in the literature to date in order to support physical interpretation of inflow states drawn from the finite-state wake model for flight conditions varying from hover to edgewise flight. The discussion of the wake model mathematical formulation is also oriented towards practical engineering applications to fill a gap in the literature. (AU)

• FAPESP's process: 18/26208-0 - Numerical modeling and analysis of aerodynamic wake induced by rotating blades
• Grantee: Lucas Gustavo Alves Ferreira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation