Khaletsky Y., Mileshin V., Povarkov V., Shipov R.

Acoustic treatment of inlet and bypass walls must be considered in the aero engine design to reduce aircraft noise and meet ICAO requirements imposed on civil aviation. Validation tests of acoustic liner efficiency are an integral part of designing the fan noise absorber system. The acoustic facilities for universal propulsion simulators (UPS) testing are suitable for obtaining the fan acoustic absorber performances. They provide rather good of modeling a fan acoustic field. The fan model tests in UPS system can be performed in anechoic wind tunnels or in anechoic chambers at UPS installation inside the acoustic chamber. New acoustic facility with anechoic chamber for UPS of developed by CIAM (Moscow) testing is presented in this paper The facility provide for testing fan models up to 0.8m diameter of both conventional and counter rotating fans. The facility provides the measurement of forward and rear fan noise simultaneously. The features of the anechoic chamber design and its acoustic performances are presented and compared with ISO standards. The fan drive, acoustic and aerodynamic data acquisition systems are described.