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2 Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2 2001

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Lift characteristics of a supercritical airfoil with controlled separation in a subsonic flow

Artamonova L., Chernov L., Radtsig A., Semenchikov N., Tarkov E.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2001

nr 11

1-6

The results of experimental investigations into supercritical airfoil aerodynamics are presented. The airfoil has cross-sectional bulkheads of different heights fitted to the airfoil. The bulkheads were mounted for an active control of flow separation. The tests were carried out at the free-stream speed V[infinity] = 47 m/s within the range of angles of attack alpha= 0 ... 10 degrees. The pressure distribution around the airfoil and airfoil aerodynamic normal force, lift and drag coefficients were found. The bulkheads fitted in the airfoil leading edge neighbourhood have proved to be effective means allowing for the control of flow separation and lift of supercritical airfoils.

Aerodynamic design features of the strafer Su-25

Babak V., Chernov L.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2001

nr 11

13-16

On 22 February, 2000 there was the 25th anniversary of the Su-25 strafer maiden flight. Over the years since being designed the Su-25 has proved to be a highly-effective close air support aircraft capable of executing combat missions with the employment of gun and bombs under severe counter-air firing, even in mountainous areas. Nowadays the Su-25 aircraft (Fig.1) are employed in many countries, being involved in regional conflicts. The aircraft proved again its high combat effectiveness. The mission success depends greatly on the aircraft manoeuvrability. Owing to perfection of the aerodynamic design the Su-25 is a highly manoeuvrable aircraft that affords reliability and survivability when flying combat missions.