Numerical Simulation and Computing the properties of radiation noise from underwater single-propeller and contra-rotating propellers

In order to study the properties of radiation noise of single-propeller and contra-rotating propellers, the numerical simulation and computing was accomplished by using RNG turbulence model, LES turbulence model, FW-H acoustic analog equation and dynamic grid model. The open water performance of single propeller and contra-rotating propellers is calculated respectively, and the calculated results are in good agreement with the published results. Then the flow field properties of single propeller and contralateral propeller are compared and analyzed, on this basis, acoustic signature analysis and computing on properties of radiation noise from underwater single-propeller and contra-rotating propellers was accomplished, the properties of pulsating sound pressure at the monitoring point are solved. From the computing results, it can be seen that there are line spectral components related to front and rear blade frequency in the noise power spectrum, the low frequency line spectrum of contra-rotating propellers is more abundant than that of single propeller.