Abstract
A full-scale test on a turbofan engine has been carried out in the framework of a European project to assess the acoustic benefits of new exhausts and novel hot-stream streamliners in the reduction of the overall jet noise level radiatedinthe far field. Thepurpose ofthetestsisalsoto provideabetterunderstanding ofcombustionnoise,which is one of the main issues for turbofan engines because of the significant noise reduction obtained for other acoustic sources such as the fan and jet by using innovative efficient silencers and acoustics liners. This work investigates the use of the so-called spectral estimation method to separate the combustion noise from other noise sources measured withanear-fieldarray ofmicrophones.Thecomparisonsbetweentheestimated andmeasuredspectradownstream, at the location at which the combustion noise is dominant, yield promising results, suggesting that the procedure of discrimination is relevant.
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