Central Aerohydrodynamic Institute
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TsAGI is working on noise reduction for the prospective MS-21 airliner

19 August 2014

TsAGI scientists have completed the first phase of research to develop noise reduction methods for the prospective MS-21 airliner. The work is carried out within the framework of the program for the creation of short- and medium-range aircraft commissioned by the Corporation Irkut.

For the experiment, a half-wing of the model MS-21 aircraft with nacelles and flaps was installed in the subsonic wind tunnel. Incoming air flow velocity over the model in the course of the experiment was 50 m/s, which roughly corresponds to the speed of the aircraft during takeoff and landing.

TsAGI specialists studied methods to reduce the noise produced by flaps. During landing, flaps are in maximum deflection position, and air vortices emerging at the ends of the flaps form air flow pressures and velocities substantial in terms of pulsation magnitude, and thus are sources of noise.

The work carried out by TsAGI was aimed at getting the average characteristics (velocity, pressure, temperature, etc.) of air flow in the vortex at the end of the flap.

The study was conducted in series using two special devices (nozzles) with pressure sensors, one of which was measuring the average air flow characteristics in the vortex area, and the other one was measuring both average and instantaneous indicators. Duplicate measurements allowed researchers to obtain more accurate values.

As a result of the test, TsAGI scientists have received a large amount of reliable information necessary for the development of methods to reduce noise in takeoff and landing modes of the MS-​​21 aircraft. The work on the study of noise reduction methods will continue in autumn.

TsAGI Press Service
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