Numerical modeling of sound generation and propagation in blade machines with subsonic flow

Subsonic flow blade machines include fans, wind turbines, pumps, small UAV propellers etc. Calculation of acoustic impact, optimization of this equipment in order to reduce the level of emitted noise is an urgent engineering task. Currently, the development of calculation methods for determining the amplitudes of pressure pulsations and noise characteristics by numerical modeling is a necessary requirement for the development of computer-aided design methods for blade machines, where the determining factors are the accuracy and speed of calculations. The method developed bases on ideas Blokhintsev, Landau, Crow, Artamonov and other researchers. A distinctive feature of the approach proposed is the decomposition, or rather, the cross-linking of the acoustic and vortex (pseudo-sound) modes in the rotor-stator interaction zone. This approach provides the construction of a more accurate method for numerical modeling of generation and propagation of noise, considering the decomposition of pressure oscillations into acoustic and vortex (pseudo-sound) modes. Testing the software is made on experimental results of a cylinder flow and air pump model.