What is it about?
My paper investigates the measured noise data in the engine intra-stage (the duct section between the rotor and the outlet guide vane (OGV)) to estimate the relative contribution of the two noise sources and thereby find out the dominant noise contributor.
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Why is it important?
Existing approaches to measuring the fan broadband (BB) noise have focussed on the measurements in the engine intake and bypass ducts primarily because these sections transmit the in-duct noise to the far-field. However, the drawback of measurements in these two sections is that they do not allow the balance between the fan (rotor) and the OGV to be determined. The engine intra-stage, on the other hand, is particularly suitable for predicting the relative contribution of the rotor and the OGV BB noise sources. In this paper, we consider the noise measurements made in the engine intra-stage of a model turbofan engine and separate out the rotor and the OGV contributions. It has been shown here for the first time that the BB noise from the OGV dominates the rotor BB noise by around 6-8 dB across the broadband frequency range of interest, thereby revealing that the OGV is almost twice as loud as the rotor!
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This page is a summary of: Estimation of the relative balance between the rotor and the OGV broadband noise, June 2023, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2023-3208.
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