Abstract:

The paper studies the unsteady separation of a wall jet on a curved surface and the response of the separation to the oscillations of the outer flow and jet strength through numerically solving the boundary layer equations. Results show that the separation point of the wall jet appears to be stationary as the oscillation frequency increases, and that the separation movement of the wall jet on a circulation-control airfoil can be calculated under quasi-steady state approximation when frequency is not very high.

Key words: unsteady flow. jet, separation, numerical calculation