A Two-Dimensional Model of Sound Transmission Through Curved and Staggered OGV: Effect of Inter-Vane Channel Mode Transitions

Leo Girier (1) , Michel Roger (1) , Hadrien Beriot (2) , Anthony Lafitte (3) , Hélène Posson (3)

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
2 Siemens Industry Software S.r.l.
3 Safran Aircraft Engines

The present work extends a recent two-dimensional analytical model for sound generation and transmission in an axial-flow outlet guide vanes row, by taking into account vane camber and stagger, as well as cut-on/cut-off or cut-off/cut-on transitions of inter-vane channel modes.It is aimed at demonstrating that such transitions may have a significant role in turbomachinery aeroacoustics, typically by changing the balance of upstream and downstream scattered waves.The model is based on a mode-matching procedure and generates a uniformly valid description of the sound field. Previous implementations neglecting the vane curvature have shown significant limitations at high frequencies compared to numerical simulations performed with a finite element method code. The extension presented in this paper introduces curvature by a slowly-varying duct formalism. Comparison with numerical simulations show substantial improvements at the cost of a reasonably higher computation time.

Domaines: Sciences de l'ingénieur [physics]

Leo Girier, Michel Roger, Hadrien Beriot, Anthony Lafitte, Hélène Posson. A Two-Dimensional Model of Sound Transmission Through Curved and Staggered OGV: Effect of Inter-Vane Channel Mode Transitions. 25th AIAA/CEAS Aeroacoustics Conference, May 2019, Delft, Netherlands. ⟨10.2514/6.2019-2690⟩. ⟨hal-02382978⟩