Abstract
A conventional turbofan engine consists of multiple stages of fan blades. The turbulent wake shed from the rotating blades will interact with the OGV (Outlet Guide Vane). As the major sound source, the turbulence-OGV interaction noise will propagate towards both upstream and downstream. The upstream propagating sound will interact with the rotating blade. Part of the sound will be blocked and only a part of acoustic wave can go through the fan-stage and propagate outwards. As a result, the sound wave is weakened due to the blockage effect in the upstream direction, while the acoustic power is enhanced in the downstream. The Euler equations are solved to account for the noise generation, propagation and scattering, while the wake turbulence is modelled by the synthetic turbulence method. The influence of geometry factors such as stagger angle and blade gap on the noise are systematically investigated. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.
| Original language | English |
|---|---|
| Publication status | Published - 2021 |
Keywords
- Acoustic noise
- Acoustic wave propagation
- Turbofan engines
- Turbomachine blades
- Turbulence
- Wakes
- Blockage effects
- CAA
- Down-stream
- Effect simulations
- Engine noise
- High-order
- Higher-order
- Outlet guide vanes
- Rotating blades
- Sliding grid
- Rotating machinery