Central Aerohydrodynamic Institute
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TsAGI performs air-flow tests on future multi-purpose light aircraft

21 June 2013

 multi-purpose light aircraft

In May this year specialists from the TsAGI aerodynamics department performed preliminary air-flow tests on a prototype multi-purpose light aircraft in its T-102 subsonic wind tunnel. To visualize the spectral flow, the tuft observation method was used, which makes it possible to obtain a qualitative picture of the flow elements of the aircraft, including with stowed and deployed wing mechanism, as well as at high angles of attack. This method involves attaching bundles of threads to the model aircraft, which change their position relative to the surface, making it possible to determine the flow spectrum, whether there is a flow breakdown, and where its boundaries are.

The experiment showed that at maximum lift the flow breakdown starts at the wing root and gradually develops in scope. Moreover, in post-stall modes the non-breakdown nature of the flow at the extremities of the wing is retained at the location of the ailerons, which provides roll control in all flight modes. In general, the tests demonstrated the favorable nature of the flow in a wide range of angles of attack and slip, including critical values.

This work builds on a range of experimental tests on the aerodynamic features of the multi-purpose light aircraft, begun in 2012.

The data received will be used to make recommendations on the development of local aerodynamics with the aim of further improving the multi-purpose light aircraft. It is further planned to conduct experiments on the effect of propellers on the aerodynamics, stability and handling of the multi-purpose light aircraft with various tail configurations.

The technological platform available for multi-purpose light aircraft with increased deployment possibilities was developed by experts from the Zhukovsky Central Aerohydrodynamics Institute (TsAGI). The platform can be used to create future 9, 13 and 19-seater planes that should meet the requirements of the Russian aircraft market of local airlines and be competitive internationally. Work on developing the platform began in 2011, under a contract with the Ministry of Industry. If this project is successful, and subject to the availability of funding, the new small aircraft may be available

TsAGI Press Service
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