| The process of noise reduction research has often been likened to “peeling an onion”—it is done one layer at a time. To reduce noise from machinery as complicated as a jet engine, you start at the most dominant source. For many turbofan engines, fan and jet noise have taken center stage and at NASA Glenn we’re proud of the many ways we’ve found to understand and reduce noise from these components. But we know our work is not done. For many of the quiet engines of the future we’ll need to find ways to reduce noise from the compressors, combustor, and turbines in the engine’s core, too.
The NASA Glenn Acoustics Branch, in collaboration with industrial and academic partners, continue to provide the latest in core noise prediction software. Currently, we can provide analysis from two codes to study core noise: CNOISE and COMBUSTOR.
While the combustor may be buried at the center of a turbofan engine, the noise it creates can be heard in the distance under certain operating conditions. These two codes can be used together to predict core noise. COMBUSTOR uses an empirical model to calculate noise for low-emission combustors using existing turbofan engine data. CNOISE uses an analytical model to calculate the transmission of the combustor hot spots through the downstream turbine stages.
+ Visit our Noise Prediction Software Requests and Documentation
page for more info on the Core Noise Codes
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