Similitude method for self-noise under boundary layer pressure fluctuation excitation.

In this paper, the authors propose a similitude method based on the Π-theorem to predict the noise generated by pressure fluctuations along the boundary layer of a full-scale model by using a small-scale model. We begin by investigating the theory of the similitude method and introducing an approach to control the flow regime. We also provide an account of active and passive methods of controlling the flow regime. We analyze a plate model and a rotary model by using the computational fluid dynamics method to validate the effectiveness of the proposed similitude method and subject it to error analysis. The results demonstrate that it can accurately predict flow-induced noise in the full-scale model based on the noise observed in the small-scale model. We also provide methods to identify transitions in flow in the Appendix.