Central Aerohydrodynamic Institute
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Scientists of FSUE “TsAGI” are working on ways to reduce the aerodynamic buffet

12 August 2015

  • Wing model in Т-112WT
  • Visualization of wing streamline at M=0,74, 6° angle of attack: а –no jet blowing, b –jet blowing visual.jpg

Scientists of FSUE “TsAGI” have completed the first series of studies of ways to prevent the aerodynamic wing aircraft buffet at high transonic speeds. The solution to this problem is necessary to increase the cruising speed of future civil long-haul aircraft and to provide the flight safety. Experimental studies are performed in the transonic wind tunnel of variable density within EU BUTERFLI Project.

The specialists of the Institute tested a supercritical wing model in the conditions under which the air shock wave oscillations occur which cause the aerodynamic buffet. To prevent this phenomenon, the scientists have used the method of active flow control around a wing by tangential blowing the compressed air jet from the slotted nozzle on its upper surface. It eliminates the flow separation and weakens the subsequent hazardous phenomena such as buffeting (oscillations of the aircraft structure or its parts).

"We investigate the process of aerodynamic buffet onset to develop the effective ways of its suppression. As a result of the experimental study the large amount of pressure pulsations data and its distribution over the wing surface were obtained, as well as about the shock wave oscillations dynamics using a high-speed video filming. Tests have validated the effectiveness of our proposed method of mitigating and suppressing the wave flow separation caused by the interaction of shock wave with boundary layer on the wing. Currently, the obtained experimental data are processed and compared with the results of previously performed calculations“,-said Albert Petrov, the deputy head of aircraft aerodynamics department of FSUE “TsAGI”.

Vitaly Sudakov, the senior researcher of the aircraft aerodynamics department, also commented on the finalization of the first work phase: “The results of the research can be the basis for the development of the system for active flow control around the advanced aircraft wing. It can be used not only for speed acceleration the but also at off-design flight conditions. With a sharp wind gust or in severe weather conditions, the system will be able to mitigate the inauspicious flow influence and to prevent their consequences.”

*The BUTERFLI (BUffet and Transition delay control investigation within European-Russian cooperation for improved FLIght performances) Project was kicked off in 2013 under the aegis of FP7 EU programme and pooled the leading Russian and European research establishments. The project is aimed to enhance the aircraft aerodynamic characteristics by study of ways to control the buffeting and the boundary layer laminar-turbulent transition. The FSUE “TsAGI” is a Project Coordinator on behalf of Russia and ONERA — Office National d’Etudes et de Recherches Aérospatiales — is the Project Coordinator on behalf of EU.

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