Prediction of broadband fan exit guide vane response

Abstract

The ability to predict the broadband fan exit guide vane response to interaction with wake turbulence using a low-order method is investigated. The RSI method is used to simulate the response of the low-count vanes in the Source Diagnostic Test. The predicted pressure spectrum is compared to that measured experimentally. The predicted spectrum of the broadband vane response at all points on the vane is similar to the final acoustic spectrum, both measured and predicted, that has been presented previously in the literature. However, this means that the simulated results do not capture spectral features above 20 kHz that are present in the experimental data. The physical source of the additional spectral features must still be identified. The simulated results match the data under 20 kHz fairly well near the midspan, but underpredict the levels for frequencies below 4 kHz at positions near the hub and the tip.