To investigate the characteristics of aerodynamic noise sources induced by flows around bluff bodies, the acoustic power level and surface acoustic power level of the bluff bodies were numerical simulated based on combination of the Realizable k-ε turbulence model and broadband noise sources model method. And the effects of oncoming wind speed, cross-section and characteristic size of the bluff bodies on the magnitude and distribution of aerodynamic noise sources were analyzed, and the influence mechanism of aerodynamic noise sources was further discussed. The results show that, the aerodynamic noise sources are quite significant in the regions where flow separation occurs with intensive turbulence, and they show a decreasing trend for the bluff body with a more streamlined cross-section. And the contribution of quadrupole sources to the total noise is much less than that of dipole sources, and thus the surface acoustic power level, which corresponds to the dipole sources, is used to analyze the characteristics of aerodynamic noise sources. Furthermore, the maximum surface acoustic power level is positively linear correlated with the logarithm of the oncoming wind speed, and is negatively linear correlated with the characteristic size. Finally, the proposed mathematical prediction model for the surface acoustic power level provides references for the acoustic environment design and aerodynamic noise control in engineering applications.