Abstract
An analytical model was developed for the evaluation of entropy noise generated in a low Mach number nozzle flow. The acoustic intensity radiated from the nozzle exit was obtained in closed form. Correlations among upstream temperature, pressure, and velocity fluctuations are required for calculation of radiated noise. The mean flow and the flow inhomogeneities were assumed to be quasi-one-dimensional, and an exponential nozzle was selected to simplify the analysis. Results show that the upstream fluctuation of temperature is an important source of nozzle entropy noise and the noise intensity is roughly proportional to the nozzle contraction rate.
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