Inflow Turbulence Impact on Sound Sources of Subsonic Turbulent Jets

The impact of numerically imposed inflow turbulence on the sound sources of turbulent jets is investigated. The sources are defined by the acoustic perturbation equations (APE) with data extracted from compressible large-eddy simulations (LES) of the turbulent jets. Inflow turbulence generated by two commonly used methods is studied. A uniform inlet case without any imposed turbulent fluctuations is also simulated as a reference. The distribution of the noise sources under different inlet conditions is then analysed in the space-frequency domain. The near- and far-field noise are investigated in the last two subsections.