CARE-3 Cavity acoustics and Rossiter modes
| Reference number | |
| Coordinator | GKN Aerospace Sweden AB |
| Funding from Vinnova | SEK 1 169 300 |
| Project duration | September 2024 - July 2025 |
| Status | Completed |
| Venture | Strengthened Swedish aeronautical research and development |
| Call | Strengthened Swedish aeronautical research and innovation - NFFP8: Call for proposals 2 |
Important results from the project
An experimental data set is created for a Helmholtz resonator showing the connection of acoustic cavity resonance and the structural vibration of a nearby component in form of a thin lip at the trailing edge of the cavity opening. The operating range is Mach 0.3-0.8 and cavity depths of 20-160mm. Steady and unsteady CFX simuations were preformed for the 100mm cavity depth case. Currently one academic paper is being prepared for publication and the data set is prepared to be shared with GKN.
Expected long term effects
The results from the project will lead to an increased understanding of the acoustic resonance behaviour of acoustic cavities and its impact on nearby structural components. The dataset and understanding enables the development of better numerical models to predict resonances in early design stages of engine components with increased confidence. The work done in CARE strengthens GKN’s position in the design of intermediate compressor modules including a bleed system.
Approach and implementation
An initial workshop of the project participants at KTH to discuss possible designs and measurement techniques. CAD designs and structural analyses were made to find the right material and design to match a designated frequency for the intended vibration. Components were manufactured in-house at KTH and installed with the chosen sensors in the windtunnel test section. Monthly meeting of reference group with researchers from GKN and KTH to evaluate and discuss ongoing results.