The current understanding of periodic transonic flow is
reviewed briefly. The effects of boundary-layer
transition, non-adiabatic wall conditions and
modifications to the aerofoil surface geometry at
the shock interactions on periodic transonic flow
are discussed. Through the methods presented, it is
proposed that the frequency of periodic motion can
be predicted with reasonable accuracy, but there are
limitations on the prediction of buffet boundaries
associated with periodic transonic flows. Several
methods have been proposed by which the periodic
motion may be virtually eliminated, most relevantly
by altering the position of transition fix,
contouring the aerofoils surface or adding a porous
surface and a cavity in the region of shock
interaction. In addition, it has been shown that
heat transfer can have a significant effect on
buffet.