Abstract
Many attempts to measure source terms of jet noise by means of jet flow–jet noise cross correlations have been only partially successful. The major difficulty is suspected to be spurious ’’probe noise’’ generated by turbulence–sensor interaction. The present analysis predicts the effects of probe noise on measured cross correlations and cross-spectral densities. The description relies on Ribner’s self and shear noise model, a development of Lighthill’s theory of jet noise. Predictions are supported by jet noise–jet flow correlations measured with a hot wire and with a nonintrusive device: a Laser Doppler Velocimeter (LDV). The hot wires are found to generate spurious but well correlated noise. This leads to major errors in jet noise diagnostics of low-speed flows.
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