Research on computational method of hydrodynamic noise of propeller
In order to establish the quantitative calculation procedure of hydrodynamic noise,the acoustic analogy cal-culation method based on FW-H equation was studied in detail.Adopting the standard model propeller of hydrodynamic per-formance in EFD and CFD,DTMB 4 119,as the research object,based on the large eddy simulation method,the problems related to the convergence of the acoustic analogy calculation were systematically discussed,including the analysis of the im-pact of acoustic computation time on the sound field points,the relationship between the sound pressure of a single blade and the total sound pressure of the blades,the comparison between the sound pressure and the flow pressure,etc.It's shown that the acoustic computation time has an effect on the frequency spectrum,but the overall sound pressure level is almost unaf-fected,with an error of less than 1％.SPL of each blade is almost the same,but there is phase difference in sound pressure.The overall SPL is lower than that of single blade.The far-field sound pressure of propeller is generally lower than the flow pressure,except in the near-field propeller region,which shows a non convergence trend.It can be seen that the acoustic ana-logy method that decouples the flow and sound propagation has certain limitations for solving near-field sound pressure.
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