The first research stage of DREAM Project is finished

The first research stage of aerodynamic and acoustic tests of contra-rotative propellers for aircraft engine within EC FP7 DREAM Project is finished. Snecma is a developer of a novel passenger aircraft engine.

The tests were performed in T-104 wind tunnel with the open test section. The model and special equipment, needed to carry out the experiment, were manufactured based on TsAGI scientific and production complex.

The unique technologies were used during the investigation. They enabled obtaining the thrust, strength and acoustical characteristics of conra-rotative propellers. The PSP (Pressure Sensitive Paints) method developed in TsAGI was used to measure the pressure distribution on rotating propellers' blades. The innovative optical methods were applied to monitor the condition and the strain of blades influenced by inertial and aerodynamic forces. The blades stress values were measured by the specially developed telemetric system. Specialists of TsAGI developed a unique technology to measure propeller noise inside wind tunnels. For the first time, the particular sound-absorbing coatings and structures were applied that enabled reducing the wind tunnel background noise and enhancing the accuracy of measuring the separated noise of the propellers.

The thrust, the torque moment values of contra-rotative propellers, the aerodynamic loads distribution on propeller blades and the static and dynamic rotor stresses were obtained as test outputs. The acoustic noise level, the frequency characteristics and orientation of a sound signal were determined.