Study on the Effects of Unsteady Flow on Sound Propagation
The influence of unsteady flow on sound propagation is investigated by using a general nonlinear wave propagation equation, which can be regarded as an extended form of the Westervelt equation. The study is conducted under the prior conditions of low flow Mach number and small fluctuations in the sound field. In order to analyze the impact of unsteady flow on the time-frequency sound field, the paper employs the time-domain finite-difference method (FDTD) to perform simulation calculations on a two-dimensional parameter array model. The research results indicate that the magnitude and direction of the flow velocity can affect the nonlinear effects of wave propagation to a certain extent, leading to shifts in the amplitude and direction of the beat frequency signals generated under nonlinear conditions.
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