Core noIse Reduction foR Uhbr engineS

The propulsion of the majority of commercial aircraft relies on turbofan engines. The current trend for future turbofan engines is towards even higher bypass ratios. These Ultra-High Bypass Ratio (UHBR) engines have large fans rotating at relatively low speeds. As a consequence of the lower speed, the fuel consumption can be reduced. Another consequence is that the engine noise signature is modified. While jet noise and fan noise will be reduced, core noise will be become more significant. In this context, the CIRRUS project aims to validate advanced low-noise concepts by developing both advanced numerical and experimental tools, to reduce the core noise of future UHBR 2030+ turbofan engines.

The overall goals of CIRRUS are to:

  • Improve numerical methods to predict noise source mechanisms and acoustic core noise radiation,
  • Improve experimental methods to measure the contribution of core noise on real engines,
  • Develop, test and integrate new generations of noise reduction acoustic liners made of Ceramic Matrix Composites (CMC),

Investigate the influence on the core noise sources of future UHBR 2030+ architectures by comparing various turbines.

More information:

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The project leading to this application has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation program under grant agreement No 886554.

CIRRUS