Abstract: In the lecture various control methods by laminar -turbulent transition of a gas flow in boundary layers of flying apparatus are discussed. Control methods are divided into three classes. The first of them is called "passive". This method is based on formation of profiles of stationary flow parameters in laminar boundary layers, which are stable to small disturbances. It is reached by gas suction from a boundary layer, cooling of a surface or flow acceleration by a longitudinal pressure gradient. Often the second of them is named the active control method. In this case perturbations are entered into a flow with an opposite phase in respect of developing disturbances in boundary layers. At last in the third method the laminar -turbulent transition control is realized by surface properties. In the lecture two surface types are considered: porous and flexible. All control methods are based on the theoretical analysis and confirmed by experiment. Subsonic, supersonic and hypersonic currents are considered. It is shown that for stabilization of the subsonic and moderate supersonic flows two first methods are most effective. In case of hypersonic flows for these purposes it is possible to use porous coverings.
This work has been financially supported by the RFBR (Grant No. 08-01-00038a)

Brief Biography of the Speaker:
Sergey Gaponov graduated from the Physics Department of Novosibirsk State University, Russia in 1964. With 1965 till April he works in the Khristianovich Institute of Theoretical and Applied Mechanics of Siberian Branch of Russian Academy of Science as Junior and Senior Scientific Researcher, Head of Laboratory. Now he is Main researcher of the same Institute. With 1992 he works also as Professor of the Department of Theoretical Mechanics, Novosibirsk State University of Architecture and Civil Engineering. S. Gaponov is the expert in a field of the fluid and gas mechanics. The basic directions of his scientific activity are connected with researches of hydrodynamic stability, non-stationary processes and the turbulence occurrence in supersonic gas flows. He defended the candidate thesis "Stability of the incompressible boundary layer on a permeable Surface" (1971) and doctor thesis (physics and mathematics) «Development of disturbances in a supersonic boundary layer» (1987). He is member of Council on a defence of doctoral theses at Institute of Theoretical and Applied Mechanics, member of Russian National Committee on Theoretical and Applied Mechanics, member of the International Scientific Committee on Fluid Mechanics and Aerodynamics. The prize of Zhukovsky was awarded to him. There are many grants for fundamental research in which he took part: Grant of International Science and Technology Center: ISTC-128-96 investigator, Grants of Russian Foundation for Basic Research (team leader.) He took part in work of numerous scientific conferences, including the Fluid Mechanics and Aerodynamics conferences. Number of his papers in refereed journals is more than140. Two books were published.