Numerical simulation of tonal noise of a bypass engine fan stage

With the tightening of the norms of ICAO aircraft noise on the ground is necessary to pay more attention to the acoustic design of power plants. For modern civil aircraft engines with high bypass fan is characterized by a dominant influence on the overall noise level. Due to the fact that the design of the fan and LPC largely determines the design of the engine must still at the project stage to be able to assess the acoustic characteristics of this module. This provides an opportunity to use methods of computational aeroacoustics. The results of numerical simulation of fan tonal noise using commercial code were presented. The results of calculations include the sound pressure level and sound radiation directivity for approach. The simulation was carried out for full nonaxisymmetric case. The possibility of using this method for evaluation of acoustic characteristics aircraft engines fan are analyzed.