Numerical Simulation of Rotor-Stator Interaction Noise in Transonic Cascades

The first objective of this work is the verification of a moving-body immersed boundary method for the direct computation of noise generated by rotor-stator interactions in transonic 2-D cascades. This method is based on a discrete forcing approach where the boundary conditions are directly imposed...

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Bibliographic Details
Published in:Journal of propulsion and power 2020-05, Vol.36 (3), p.363-380
Main Authors: Miserda, Roberto F. Bobenrieth, Pimenta, Braulio Gutierrez, da Rocha, Luiza Sampaio
Format: Article
Language:English
Subjects:
Annular ducts
Boundary conditions
Broadband
Cartesian coordinates
Cascades
Computer simulation
Ducts
Noise
Numerical methods
Propagation
Propagation modes
Rotor stator interactions
Rotors
Stators
Wave fronts
Wave propagation
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Summary:The first objective of this work is the verification of a moving-body immersed boundary method for the direct computation of noise generated by rotor-stator interactions in transonic 2-D cascades. This method is based on a discrete forcing approach where the boundary conditions are directly imposed at the surface of moving and static cascades immersed in a domain discretized by a regular Cartesian grid. The numerical method is verified using the mode generation and propagation theory applied to thin annular ducts for two-dimensional cascades. Two cases are simulated, the rotor alone and the rotor-stator interaction. For the first case, all computed modes are generated following the Tyler-Sofrin rule, but none of them are cut-on, as predicted by the duct propagation theory. For the second case, all modes are also generated in accordance with that rule, and the numerical results for the cut-on modes are also in excellent agreement with the duct propagation theory regarding mode number, signal, and angle of the wavefront. The second objective is to study the effect of decreasing rotor-stator separation on tone and broadband noise.
ISSN:1533-3876
0748-4658
1533-3876
DOI:10.2514/1.B37627