A COMPUTATIONAL STUDY OF THE UNSTEADY SHOCK-WAVE STRUCTURE IN A TWO-DIMENSIONAL TRANSONIC ROTOR

Some of the loss mechanisms associated with unsteady transonic flow in a two-dimensional cascade are discussed. For this purpose, the unsteady flowfield generated by a shifting inlet velocity profile modeling approximately the stator wake as a linear velocity profile is compared to the steady field created by a uniform inlet. Both flows are generated by a numerical solution of the Euler equations using the MacCormack difference scheme. The results indicate that there is considerable influence of the inlet flow unsteadiness on the location of the shock wave that moves upstream for a distance on the order of 15% of chord length.