СЕМИНАР ПО АЭРОМЕХАНИКЕ (ФУНДАМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ)

3 сентября 2013 г. (вторник)

главный корпус ИТПМ, к. 216, 14:00
        
«Control of leading-edge separation by periodic forsing»
     
Докладчики:
Yuli Lifshitz, Research Associate, Department of Mechanical Engineering;
David Degani, Professor, Department of Mechanical Engineering, Associate Fellow AIAA.
(Technion – Israel Institute of Technology )

Control of Leading-Edge Separation by Periodic Forcing

Yuli Lifshitz*, David Degani†

Technion-Israel Institute of Technology, Haifa 32000, Israel
*Research Associate, Department of Mechanical Engineering.

†Professor, Department of Mechanical Engineering, Associate Fellow AIAA.

Separation control by two-dimensional periodic excitation is studied theoretically on a parabola at angle of attack using a mathematical model of incompressible laminar flow with periodic perturbations. This model is based on the decomposition of flow parameters on the mean and periodic parts. The governing equations for both parts are derived from the Navier-Stokes equations using time averaging. For the mean part this procedure generates new momentum equations, which comprise additional sources resulted from the averaging of quadratic periodic terms. Just these sources of momentum allow the separation control. The influence of frequency, amplitude and station where the excitation is inserted in the flow on the possibility of the separation control is analyzed in the present paper. The results give a procedure allowing the estimation of above parameters in the case of a leading-edge separation.