Abstract
Acoustic measurements performed with pressure sensors (microphones and hydrophones) can be subject to error if the sensors are in contact with a turbulent boundary layer flow. These errors are a result of the random pressure fields (flow noise) generated by the turbulent motions of the fluid. In this paper, a simple analysis is given whereby the flow noise response of a pressure sensor placed in a turbulent boundary layer flow can be estimated. If the purpose of the sensor is to measure the sound emitted from a source outside of the turbulent boundary layer, then a bias error for the measurement can be calculated. The error formula is equally applicable to intensity measurements made with the two‐sensor technique, providing the mean flow Mach number is small. Example calculations are presented. [Work supported by NAVSEA 63R‐31.]
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